Hilti Dsh 700 Owners User Manual

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DSH 900  
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Hilti Corporation  
LI-9494 Schaan  
Tel.: +423/2342111  
Fax: +423/2342965  
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Operating instructions  
Mode d’emploi  
en  
fr  
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Manual de instrucciones  
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Hilti = registered trademark of Hilti Corp., Schaan W 3503 1110 00-Pos. 3  
Right of technical and programme changes reserved S. E. & O.  
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Printed in Italy © 2010  
288292 / F  
ORIGINAL OPERATING INSTRUCTIONS  
DSH 700/ DSH 900 cut-off saw  
en  
Parts, operating controls and indicators (DSH 700 /  
DSH 900) 1  
Forward grip  
It is essential that the operating instruc-  
tions are read before the machine is oper-  
ated for the first time.  
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Rear grip  
Guide wheels  
Always keep these operating instructions  
together with the machine.  
Start/stop switch  
Choke lever / half-throttle lock  
Throttle safety grip  
Throttle trigger  
Decompression valve  
Fuel pump  
Ensure that the operating instructions are  
with the machine when it is given to other  
persons.  
Starter handle  
Cutting disc  
Clamping screw  
Hole for locking pin for changing cutting discs  
Clamping flange  
Guard (hood)  
Disc guard adjustment grip  
Water valve  
Water connection  
Fuel tank cap  
Air filter cover  
Belt tensioner  
Contents  
1. General information  
2. Description  
3. Accessories  
4. Technical data  
5. Safety instructions  
6. Before use  
7. Operation  
8. Care and maintenance  
9. Troubleshooting  
10. Disposal  
Page  
2
3
4
5
6
9
13  
14  
18  
20  
Exhaust / muffler  
Spark filter  
Spark plug connector  
Type identification plate  
11. Federal emission control warranty  
statement  
12. Manufacturer’s warranty  
20  
21  
1 These numbers refer to the corresponding illustra-  
tions. The illustrations can be found on the fold-out  
cover pages. Keep these pages open while studying  
the operating instructions.  
In these operating instructions, the designation “the  
machine” always refers to the DSH 700 or DSH 900  
gasoline-powered cut-off saw.  
DSH-FSC saw carriage 2  
Grip  
Throttle trigger  
@
;
Cutting depth adjustment  
=
Hold-down device  
Water tank  
%
&
Water connection  
(
Axial adjustment  
)
+
Throttle cable  
Machine cradle  
§
1
1. General information  
Obligation signs  
1.1 Safety notices and their meaning  
DANGER  
Draws attention to imminent danger that could lead  
to serious bodily injury or fatality.  
en  
Wear  
protective  
gloves.  
Wear safety  
shoes.  
Wear ear  
protection, eye  
protection,  
Don’t use  
toothed  
cutting discs.  
WARNING  
Draws attention to a potentially dangerous situation  
that could lead to serious personal injury or fatality.  
respiratory  
protection and  
a hard hat. Eye  
protective  
devices must  
comply with  
ANSI Z87.1.  
CAUTION  
Draws attention to a potentially dangerous situation  
that could lead to slight personal injury or damage to  
the equipment or other property.  
NOTE  
Draws attention to an instruction or other useful  
information.  
Don’t use  
damaged  
cutting discs.  
Smoking and  
naked flames  
prohibited.  
1.2 Explanation of the pictograms and other  
information  
Prohibition signs  
Symbols  
WARNING!  
Read and  
follow all  
Motor stop  
system  
Fuel pump  
Transport by  
crane is not  
permissible.  
safety  
precautions in  
the operator’s  
manual.  
Warning signs  
Failure to  
follow these  
instructions  
could result in  
serious or fatal  
injury.  
General  
warning  
Warning: hot  
surface  
Warning:  
Flying sparks  
present a fire  
risk.  
Warning: Risk  
of kickback.  
Location of identification data on the machine  
The type designation and serial number can be found  
on the type identification plate on the machine. Make  
a note of this data in your operating instructions and  
always refer to it when making an enquiry to your  
Hilti representative or service department.  
max.  
5100 rpm  
Warning: Don’t  
inhale toxic  
vapors or  
exhaust  
Minimum  
permissible  
speed rating of  
the cutting  
Type:  
fumes.  
discs used  
Generation: 01  
Serial no.:  
2
2. Description  
sive granulate. These cutting discs feature fabric or  
fiber reinforcement which improves their strength,  
toughness and breakage resistance.  
2.1 Use of the product as directed  
The machine is intended for hand-held or walk-behind  
use for dry or wet cutting of asphalt and mineral  
or metallic construction materials using abrasive or  
diamond cutting discs.  
To reduce the amount of dust produced when cutting,  
we recommend use of the wet cutting method.  
The working environment may be as follows: con-  
struction site, workshop, renovation, conversion or  
new construction.  
To avoid the risk of injury, use only genuine Hilti  
accessories and cutting tools.  
Observe the safety rules and operating instructions  
for the accessories used.  
en  
NOTE  
Abrasive cutting discs for gasoline-powered cut-off  
saws are used mainly for cutting ferrous and non-  
ferrous metals.  
NOTE  
Various grit types such as aluminum oxide, silicon  
carbide, zirconium, etc., with a different bonding  
material (matrix) or matrix hardness, are available  
depending on the construction material to be cut.  
Working on materials hazardous to the health (e.g.  
asbestos) is not permissible.  
2.4 Diamond cutting discs for hand-guided  
gasoline-powered cut-off saws  
Observe the information printed in the operating in-  
structions concerning operation, care and mainte-  
nance.  
Diamond cutting discs for gasoline-powered cut-off  
saws consist of a steel core (disc) with diamond  
segments (metallically bonded industrial diamonds).  
Nationally applicable industrial safety regulations  
must be observed.  
NOTE  
The machine is designed for professional use and  
may be operated, serviced and maintained only by  
trained, authorized personnel. This personnel must be  
informed of any special hazards that may be encoun-  
tered. The machine and its ancillary equipment may  
present hazards when used incorrectly by untrained  
personnel or when used not as directed.  
Take the influences of the surrounding area into  
account. Do not use the power tool or appliance  
where there is a risk of fire or explosion.  
Modification of the machine or tampering with its  
parts is not permissible.  
Segmented diamond cutting discs or those with a  
continuous cutting face are mainly used for cutting  
asphalt and mineral construction materials.  
2.5 Cutting disc specifications  
With the DSH 700-12" use only diamond discs or  
synthetic-resin-bonded fiber-reinforced cutting discs  
with a diameter of 12" and a permissible peripheral  
speed of at least 80m/sec. With the DSH 700-14",  
DSH 900-14" and DSH 900-16" use only diamond  
discs or synthetic-resin-bonded fiber-reinforced cut-  
ting discs with a diameter of 14" or, respectively, 16"  
(DSH 900-16") and a permissible peripheral speed of  
at least 100m/sec. The cutting disc manufacturer’s  
instructions on fitting and using the discs must also  
be observed.  
Don’t work in closed, poorly ventilated rooms.  
2.2 Items supplied as standard  
1
1
1
1
Machine  
DSH tool set  
Operating instructions  
DSH consumables kit  
2.6 Recommendations for use  
We recommend that the workpiece is not cut through  
in a single operation. Advance to the required depth  
of cut by making several to-and-fro movements.  
To avoid damaging the diamond cutting disc when  
dry cutting, lift the blade out of the cut for approx. 10  
2.3 Abrasive cutting discs for hand-guided  
gasoline-powered cut-off saws  
Abrasive cutting discs for gasoline-powered cut-off  
saws are composed of synthetic-resin-bonded abra-  
3
seconds every 30 to 60 seconds while the machine is  
still running.  
To reduce the amount of dust produced when cutting,  
we recommend use of the wet cutting method.  
3. Accessories  
Accessories for the DSH 700 and DSH 900  
Diamond cutting disc  
en  
000000, See main catalog.  
Abrasive cutting disc  
000000, See main catalog.  
365826  
365595  
431364  
267736  
Two-stroke oil  
Water supply unit  
Saw carriage  
Hard hat  
DSH (1 L)  
DWP 10  
DSH-FSC  
Protective glasses  
Container  
Consumables kit  
285780  
365828  
365602  
I-VO B05 PS clear  
DSH  
DSH  
Consumables and wearing parts for the DSH 700  
261990  
412230  
359425  
359476  
412228  
412237  
359648  
412245  
412261  
412257  
412264  
Air filter  
Cord (5 pcs)  
Starter  
Drive belt  
Filter element  
Spark plug  
DSH  
DSH  
DSH 700  
DSH 12/14"  
DSH  
DSH  
DSH  
DSH 700  
DSH  
DSH  
Tool set  
Cylinder set  
Fastening screw assy.  
Flange (2)  
Centering ring 20 mm / 1"  
DSH  
Consumables and wearing parts for the DSH 900  
261990  
412230  
359427  
359476  
359477  
412228  
412237  
359648  
412384  
412261  
412257  
412264  
Air filter  
Cord (5 pcs)  
Starter  
Drive belt  
Drive belt  
Filter element  
Spark plug  
Tool set  
Cylinder set  
Fastening screw assy.  
Flange (2)  
DSH  
DSH  
DSH 900  
DSH 12/14"  
DSH 16"  
DSH  
DSH  
DSH  
DSH 900  
DSH  
DSH  
Centering ring 20 mm / 1"  
DSH  
4
4. Technical data  
Right of technical changes reserved.  
DSH 700 30 cm  
DSH 700 35 cm  
/ 14"  
DSH 900 35 cm  
/ 14"  
DSH 900 40 cm  
/ 16"  
Machine  
/ 12"  
en  
Motor type  
Two-stroke /  
single-cylinder /  
air-cooled  
Two-stroke /  
single-cylinder /  
air-cooled  
Two-stroke /  
single-cylinder /  
air-cooled  
Two-stroke /  
single-cylinder /  
air-cooled  
68.7 cm³ (4.19 in³) 68.7 cm³ (4.19 in³) 87 cm³ (5.31 in³)  
87 cm³ (5.31 in³)  
Cubic capacity  
Weight without  
cutting disc, tank  
empty  
11.3 kg (24.91 lb)  
11.5 kg (25.35 lb)  
11.7 kg (25.79 lb)  
11.9 kg (26.23 lb)  
Weight with saw  
carriage, without  
cutting disc, tank  
empty  
42.3 kg (93.25 lb)  
42.5 kg (93.7 lb)  
42.7 kg (94.14 lb)  
42.9 kg (94.58 lb)  
Power rating  
3.5 kW  
3.5 kW  
4.3 kW  
4.3 kW  
Maximum arbor  
speed  
5,100/min  
5,100/min  
5,100/min  
4,700/min  
Motor speed  
10,000 200/min  
10,000 200/min  
10,000 200/min  
10,000 200/min  
Idling speed  
2,500…3,000/min 2,500…3,000/min 2,500…3,000/min 2,500…3,000/min  
Dimensions with  
cutting disc (L x  
W x H) in mm  
Ignition (type)  
783 x 261 x 434  
808 x 261 x 434  
808 x 261 x 434  
856 x 261 x 466  
Electronically-  
Electronically-  
Electronically-  
Electronically-  
controlled ignition controlled ignition controlled ignition controlled ignition  
timing  
timing  
timing  
timing  
Electrode gap  
Spark plug  
0.5 mm (0.02")  
0.5 mm (0.02")  
0.5 mm (0.02")  
0.5 mm (0.02")  
Manufacturer: NGK Manufacturer: NGK Manufacturer: NGK Manufacturer: NGK  
Type: CMR7A-5  
Type: CMR7A-5  
Type: CMR7A-5  
Type: CMR7A-5  
Carburetor  
Manufacturer:  
Walbro  
Manufacturer:  
Walbro  
Manufacturer:  
Walbro  
Manufacturer:  
Walbro  
Model: WT  
Model: WT  
Model: WT  
Model: WT  
Type: 895  
Type: 895  
Type: 895  
Type: 895  
Fuel mixture  
Hilti oil 2% (50:1)  
or TC oil 4%  
(25:1)  
Hilti oil 2% (50:1)  
or TC oil 4%  
(25:1)  
Hilti oil 2% (50:1)  
or TC oil 4%  
(25:1)  
Hilti oil 2% (50:1)  
or TC oil 4%  
(25:1)  
Tank capacity  
900 cm³ (54.9 in³) 900 cm³ (54.9 in³) 900 cm³ (54.9 in³) 900 cm³ (54.9 in³)  
Reversible  
20 mm (0.79") or  
25.4 mm (1")  
Reversible  
20 mm (0.79") or  
25.4 mm (1")  
Reversible  
20 mm (0.79") or  
25.4 mm (1")  
Reversible  
20 mm (0.79") or  
25.4 mm (1")  
Cutting disc mount  
Disc arbour size  
Max. disc outside  
diameter  
308 mm (12.13")  
359 mm (14.13")  
359 mm (14.13")  
410 mm (16.14")  
102 mm (4.02")  
102 mm (4.02")  
102 mm (4.02")  
102 mm (4.02")  
Min. flange outside  
diameter  
5
DSH 700 30 cm  
/ 12"  
DSH 700 35 cm  
/ 14"  
DSH 900 35 cm  
/ 14"  
DSH 900 40 cm  
/ 16"  
Machine  
Max. disc thick-  
ness (steel disc  
thickness)  
Maximum cutting  
depth  
5.5 mm (0.22")  
5.5 mm (0.22")  
5.5 mm (0.22")  
5.5 mm (0.22")  
en  
100 mm (3.94")  
125 mm (4.92")  
125 mm (4.92")  
150 mm (5.91")  
5. Safety instructions  
In addition to the information relevant to safety  
given in each of the sections of these operating  
instructions, the following points must be strictly  
observed at all times.  
striking yourself or other persons. Adjust the  
position of the disc guard accordingly.  
i) Adjust the position of the disc guard on the  
machine correctly. The guard must be securely  
attached to the machine and positioned for max-  
imum safety, so the least amount of cutting disc  
is exposed towards the operator. The guard  
helps to protect the operator from broken disc  
fragments and accidental contact with the disc.  
j) Store machines in a secure place when not in  
use. When not in use, machines must be stored  
in a dry, high place or locked away out of reach  
of children.  
5.1 General safety rules  
a) Use the right tool or machine for the job. Do not  
use the tool or machine for purposes for which  
it was not intended. Use it only as directed and  
when in faultless condition.  
b) Avoid touching rotating parts. Switch the power  
tool on only after bringing it into position at the  
workpiece. Touching rotating parts, especially  
rotating drill bits, discs or blades, etc. may lead  
to injury.  
c) Use only the genuine Hilti accessories or an-  
cillary equipment listed in the operating in-  
structions. Use of accessories or ancillary equip-  
ment not listed in the operating instructions may  
present a risk of personal injury.  
d) Always hold the saw and the saw carriage se-  
curely with both hands on the grips provided.  
Keep the grips dry, clean and free from oil and  
grease.  
k) Switch the machine off before transporting it.  
l) When laying the machine down, make sure that  
it stands securely.  
m) Switch the machine off after use.  
n) Have your power tool serviced by a qualified  
repair person using only identical replacement  
parts. This will ensure that the safety of the power  
tool is maintained.  
o) Maintain the machine carefully. Check for mis-  
alignment or binding of moving parts, breakage  
of parts and any other condition that may affect  
the machine’s operation. If damaged, have the  
machine repaired before use. Poor maintenance  
is the cause of many accidents.  
p) Set the switch to the “stop” position before  
changing the cutting disc or adjusting the guard.  
q) Don’t leave the machine unattended while the  
motor is running.  
e) Slits cut in loadbearing walls of buildings or other  
structures may influence the statics of the struc-  
ture, especially when steel reinforcing bars or  
load-bearing components are cut through. Con-  
sult the structural engineer, architect, or person  
in charge of the building project before begin-  
ning the work.  
r) Always apply full throttle when cutting.  
s) Hold the machine by insulated gripping surfaces  
when performing an operation where the cutting  
disc may contact hidden wiring. Contact with a  
“live” wire will make exposed metal parts of the  
machine “live” and shock the operator.  
f) Do not overload the machine. It will work more  
efficiently and more safely within its intended  
performance range.  
g) Never use the power tool without the guard  
(hood).  
h) Take steps to ensure that flying sparks from  
the power tool do not present a hazard, i.e. by  
6
t) Children must be instructed not to play with the l) Don’t work from a ladder.  
machine.  
m) Don’t work above shoulder height.  
u) The appliance is not intended for use by children  
n) If the work involves breaking right through, take  
the appropriate safety measures at the opposite  
side. Parts breaking away could fall out and / or  
fall down and injure other persons.  
or debilitated persons.  
v) Lifting the saw and saw carriage by crane is not  
permissible.  
en  
w) Do not stand the saw and saw carriage on an o) When using the wet cutting technique, take  
inclined surface. Always check to ensure that  
the saw and saw carriage are standing securely.  
care to ensure that the water drains away in  
controlled fashion and check that the water or  
water spray presents no hazard and causes no  
damage to the surrounding area.  
5.2 Proper organization of the work area  
p) Secure the area below the working area.  
5.3 Thermal  
a) Ensure that the workplace is well lit.  
b) Ensure that the workplace is well ventilated.  
Exposure to dust at a poorly ventilated workplace  
may result in damage to the health.  
a) Wear protective gloves when changing cutting  
tools as they get hot during use.  
c) Don’t work in closed rooms. Carbon monox-  
ide, unburned hydrocarbons and benzene in the b) The exhaust system and motor get very hot.  
exhaust gas may cause asphyxiation.  
Always hold the machine securely with both  
hands on the grips provided.  
d) Keep the workplace tidy. Objects which could  
cause injury should be removed from the work-  
ing area. Untidiness at the workplace can lead to  
accidents.  
e) Secure the workpiece. When necessary, use  
clamps or a vice to secure the workpiece. Don’t  
hold the workpiece by hand.  
f) Dress properly. Do not wear loose clothing or  
jewellery. Keep your hair, clothing and gloves  
away from moving parts. Loose clothes, jewellery  
or long hair can be caught in moving parts.  
g) It is recommended that non-slip shoes or boots  
are worn when working outdoors.  
5.4 Liquids (gasoline and oil)  
a) Store gasoline and oil in a well-ventilated room  
in fuel containers in compliance with regula-  
tions.  
b) Allow the machine to cool before refueling.  
c) Use a suitable funnel when refueling.  
d) Don’t use the gasoline or other flammable liq-  
uids for cleaning.  
e) Don’t refuel the machine at the workplace.  
f) When refueling, take care to avoid spillage of  
gasoline.  
h) Keep children away. Keep other persons away  
from the working area.  
5.5 Sawing slurry  
Avoid skin contact with sawing slurry.  
i) Do not overreach. Keep proper footing and bal-  
ance at all times. This enables better control of  
the power tool in unexpected situations.  
j) Fit the filled water tank to the saw carriage only  
after fitting the saw to the saw carriage. This  
will prevent the saw carriage falling over.  
5.6 Vapors  
k) Concealed electric cables or gas and water  
pipes present a serious hazard if damaged while  
you are working. Accordingly, check the area in  
a) Don’t smoke when filling the tank with fuel!  
which you are working beforehand (e.g. using b) Avoid inhaling gasoline vapors and exhaust  
a metal detector). External metal parts of the  
machine may become live, for example, when an  
electric cable is damaged accidentally.  
fumes.  
c) Hot exhaust gases containing sparks or sparks  
generated by the cutting operation may cause fire  
7
or explosion. Take care to ensure that the sparks  
generated do not ignite flammable (gasoline,  
dry grass, etc.) or explosive (gas, etc.) sub-  
stances.  
5.8 Requirements to be met by users  
a) Improve the blood circulation in your fingers by  
relaxing your hands and exercising your fingers  
during breaks between working.  
b) Stay alert, watch what you are doing and use  
common sense when operating the machine.  
Don’t use the machine when you are tired or  
under the influence of drugs, alcohol or medi-  
cation. A moment of inattention while operating  
machines may result in serious personal injury.  
5.7 Dusts  
en  
a) Large quantities of dust hazardous to the health  
are generated when cutting (especially when dry  
cutting). The operator and bystanders must wear  
suitable dust masks while the machine is in use.  
b) Dust or vapors containing chemical substances  
may be generated when working on unknown  
materials. These substances could cause serious  
damage to the health. Obtain information about  
hazards presented by the materials from the  
client or the authorities responsible. The opera-  
tor of the machine and any bystanders mustwear  
respiratory protection that is approved for use  
in conjunction with the applicable substance.  
c) To reduce the amount of dust generated when  
cutting mineral materials and asphalt, we rec-  
ommend use of the wet cutting technique.  
5.9 Safety warnings for abrasive cutting-off  
operations  
a) Check that the cutting disc is fitted in accordance  
with the manufacturer’s instructions.  
b) Cutting discs must be stored and handled care-  
fully in accordance with the manufacturer’s in-  
structions.  
c) Use only cutting discs with a rated maximum  
permissible speed which is at least as high as  
the machine’s highest running speed.  
d) Cutting discs which are damaged or out of round  
d) WARNING: Some dust created by grinding,  
sanding, cutting and drilling contains chem-  
icals known to cause cancer, birth defects,  
infertility or other reproductive harm; or seri-  
ous and permanent respiratory or other injury.  
Some examples of these chemicals are: lead from  
lead-based paints, crystalline silica from bricks,  
concrete and other masonry products and natural  
stone, arsenic and chromium from chemically-  
treated lumber. Your risk from these exposures  
varies, depending on how often you do this type  
of work. To reduce exposure to these chemi-  
cals, the operator and bystanders should work  
in a well-ventilated area, work with approved  
safety equipment, such as respiratory protec-  
tion appropriate for the type of dust generated,  
and designed to filter out microscopic particles  
and direct dust away from the face and body.  
Avoid prolonged contact with dust. Wear pro-  
tective clothing and wash exposed areas with  
soap and water. Allowing dust to get into your  
mouth, nose, eyes, or to remain on your skin may  
promote absorption of harmful chemicals.  
(causing vibration) must not be used.  
e) The outside diameter and the thickness of the  
cutting disc must be within the capacity rating  
of the machine. Incorrectly sized accessories  
cannot be adequately guarded or controlled.  
f) Don’t use toothed cutting discs (saw blades or  
similar). Blades or discs of this kind frequently  
cause kickback or loss of control of the machine.  
g) Guide the machine evenly and do not apply  
lateral pressure to the cutting disc. Always bring  
the machine into contact with the workpiece at  
right angles. Don’t attempt to alter the line of  
cut by applying lateral pressure or by bending  
the cutting disc while cutting is in progress.  
This presents a risk of damaging or breaking the  
cutting disc.  
h) Don’t attempt to brake the cutting disc with the  
hand.  
i) The cutting disc and flange or any other acces-  
sory must fit the arbor of the machine exactly.  
Cutting discs or accessories with arbor holes that  
do not match the mounting hardware of the ma-  
8
chine will run out of balance, vibrate excessively  
and may cause loss of control.  
exposure to moisture have a negative effect on  
the strength of the disc.  
j) Always use undamaged disc mounting flanges p) Observe the expiry date for resin-bonded cutting  
of the correct diameter for the cutting discs  
used. Correctly sized flanges support the cut-  
ting disc and thus reduce the possibility of disc  
breakage.  
discs and don’t use the discs after this date.  
q) Resharpen polished diamond segments (no di-  
amonds project from the segment matrix) by  
cutting with the disc in a very abrasive material  
such as sandstone.  
r) Don’t use damaged diamond cutting discs  
(cracks in the steel disc, broken or polished  
segments, damaged arbor hole, bent or  
distorted steel disc, heavy discoloration due to  
overheating, steel disc worn away beneath the  
segments, diamond segments with no lateral  
overhang, etc.)  
en  
k) When fitting the cutting disc, always take care  
to ensure that the disc’s specified direction of  
rotation corresponds to the direction of rotation  
of the machine.  
l) Store the cutting disc in accordance with the  
manufacturer’s recommendations. Incorrect or  
careless storage may damage the cutting disc.  
m) Don’t use cutting discs with a thickness greater  
than 5.5 mm (0.22").  
n) Remove the cutting disc from the machine after  
use. The cutting disc may suffer damage if the  
machine is transported with the disc fitted.  
o) Abrasive cutting discs for gasoline-powered cut-  
off saws which are used for wet cutting must  
be used up the same day as long periods of  
5.10 Personal protective equipment  
The user and any other persons in the vicinity  
must wear suitable eye protection, a hard hat, ear  
protection, protective gloves and safety footwear  
while the machine is in use.  
6. Before use  
CAUTION  
Alkylate gasoline does not have the same density  
(specific weight) as conventional gasoline. To avoid  
damage when alkylate gasoline is used, the machine  
must be readjusted by Hilti Service. Alternatively, the  
oil content can be increased to 4% (1:25).  
6.1 Fuel  
NOTE  
The two-stroke motor runs on a mixture of gasoline  
and oil. The quality of the fuel mixture decisively  
influences the running and life expectancy of the  
motor.  
6.1.1 Two-stroke oil  
Use Hilti two-stroke oil for air-cooled motors or a  
good quality two-stroke oil with the TC classification.  
6.1.2 Gasoline  
CAUTION  
Use regular or super gasoline with an octane rating  
of at least 90 ROZ.  
The alcohol content (e.g. ethanol, methanol...) of the  
fuel used must not exceed 10%, otherwise the life  
expectancy of the motor will be greatly reduced.  
Avoid direct skin contact with gasoline.  
CAUTION  
Ensure that the workplace is well ventilated in order  
to avoid breathing in gasoline fumes.  
CAUTION  
Use a fuel container that complies with the appli-  
cable regulations.  
9
6.1.3 Mixing fuel  
CAUTION  
CAUTION  
Take care to avoid spilling fuel.  
The motor will suffer damage if run with fuel mixed  
in the wrong ratio or with unsuitable oil. Use the  
following mix ratio with Hilti two-stroke oil: 1 part  
oil + 50 parts gasoline. Use the following mix ratio  
with quality two-stroke oil with the TC classification:  
1 part oil + 25 parts gasoline.  
CAUTION  
If your clothing becomes soiled with gasoline while  
refueling, you must change your clothing.  
en  
CAUTION  
After refueling, clean the machine and accessories  
to remove any spilt fuel.  
1. Pour the required quantity of two-stroke oil into  
the fuel container.  
2. Add the gasoline to the fuel container.  
3. Close the cap on the fuel container.  
4. Mix the fuel by shaking the fuel container.  
DANGER  
Check to ensure there is no leakage from the ma-  
chine. Don’t start the machine if fuel is found to be  
leaking from it.  
6.1.4 Storing the fuel mixture  
CAUTION  
Pressure may build up in the fuel tank. Accordingly,  
take care when opening the fuel tank cap.  
1. Mix the fuel (two-stroke oil / gasoline mixture)  
by shaking the fuel container.  
2. Place the machine in a steady upright position.  
3. Open the fuel tank cap by turning it counterclock-  
wise.  
4. Fill the tank slowly using a funnel.  
5. Close the fuel tank cap by turning it clockwise.  
6. Close the cap on the fuel container.  
CAUTION  
Store the fuel in a dry, well-ventilated room.  
Mix only enough fuel for a few days’ use.  
Clean the fuel container occasionally.  
6.2 Fitting and changing the cutting disc 3  
6.1.5 Filling the machine with fuel  
max.  
5100 rpm  
CAUTION  
Cutting discs which are damaged or out of round  
(causing vibration) must not be used.  
CAUTION  
Don’t refuel the machine right at the place where  
you are working (move at least 3 meters (10 feet)  
away from the object you have been cutting).  
CAUTION  
The maximum permissible speed of the disc or  
blade must be at least as high as the maximum  
speed printed on the machine.Accessories driven at  
a speed above their maximum permissible speed may  
break and fly apart.  
DANGER  
Don’t smoke when filling the tank with fuel!  
CAUTION  
Don’t refuel the machine in a room where a naked  
flame or sparks could ignite the gasoline vapors.  
CAUTION  
Use only cutting discs with a 20 mm or 25.4 mm  
(1") arbor hole.  
CAUTION  
Don’t refuel the machine while the motor is running.  
CAUTION  
CAUTION  
The cutting discs, flanges or other accessories  
must properly match the arbor size of the machine.  
Cutting discs or accessories with arbor holes that do  
not match the mounting hardware of the machine will  
Don’t refuel the machine while the motor is hot.  
CAUTION  
Wear suitable protective gloves when refueling.  
10  
run out of balance, vibrate excessively and may cause  
loss of control.  
6.3 Adjusting the guard  
CAUTION  
Don’t use synthetic resin-bonded fiber-reinforced  
cutting discs that have exceeded their use-by date.  
en  
DANGER  
Don’t operate the machine without the protective  
devices that belong to it.  
CAUTION  
Don’t use damaged diamond cutting discs (cracks in  
the steel disc, broken or polished segments, dam-  
aged arbor hole, bent or distorted steel disc, heavy  
discoloration due to overheating, steel disc worn  
away beneath the segments, diamond segments  
with no lateral overhang, etc.)  
DANGER  
Adjust the guard to the correct position. Direct  
the particles of material removed away from the  
operator and the machine.  
WARNING  
1. Insert the locking pin in the hole in the drive belt  
cover and turn the cutting disc until the locking  
pin engages.  
The motor and the cutting disc must have come  
to a complete stop before making adjustments or  
changing parts etc.  
2. Use the wrench to release the clamping screw by  
turning it counterclockwise.  
Hold the guard by the grip provided and rotate it to  
the desired position.  
3. Remove the clamping flange and the cutting disc.  
4. Check that the mounting bore of the cutting disc  
to be fitted corresponds with the centering collar  
of the cutting disc mounting flange. The mount-  
ing flange is provided with a 20 mm diameter  
centering collar on one side and a 25.4 mm (1")  
diameter centering collar on the opposite side.  
5. Clean the clamping and centering surfaces on  
the machine and on the cutting disc.  
6. CAUTION Take care to ensure that the direction  
of rotation of the cutting disc (indicated by an  
arrow) matches the direction of rotation shown  
on the machine.  
6.4 Converting the saw from normal cutting  
mode to flush cutting mode 4  
DANGER  
Adjust the guard to the correct position. Direct  
the particles of material removed away from the  
operator and the machine.  
Place the cutting disc on the centering collar of  
the clamping flange.  
NOTE  
After completion of flush cutting it is recommended  
that the saw is converted back to normal cutting mode  
due to the more favorable balance in this position.  
7. Place the clamping flange on the drive arbor  
and tighten the cutting disc clamping screw by  
turning it clockwise.  
8. Insert the locking pin in the hole in the drive belt  
cover and turn the cutting disc until the locking  
pin engages.  
NOTE  
After doing this, check that the cutting disc can be  
turned easily by hand and that all screws have been  
tightened securely.  
9. Tighten the cutting disc clamping screw to a  
torque of 25 Nm.  
11  
DANGER  
6.5 Locking rotary movement of the guide  
wheels 5  
Don’t operate the machine without the protective  
devices that belong to it.  
WARNING  
When working on roofs, scaffolds and/or slight  
slopes, always lock the guide wheels to prevent the  
saw rolling away inadvertently and possibly falling.  
Use the built-in safety feature which allows you  
to lock the wheels by fitting them in the reversed  
position (turned through 180°).  
In order to facilitate cutting as closely as possible to  
edges and walls etc., the forward section of the saw  
arm can be turned and fitted in the reversed position  
so that the cutting disc, when seen from behind, is  
positioned to the right of the saw arm.  
1. Remove the spray jets from the guard.  
2. Slacken the three clamping nuts on the forward  
section of the saw arm approx. one complete  
turn.  
en  
1. Release the guide wheel mounting screws and  
remove the guide wheels.  
2. Reverse the guide wheels (turn through 180°)  
3. Release the tension on the drive belt by turning  
the belt tensioning cam counterclockwise care-  
fully as far as it will go (until resistance is felt,  
i.e. approx. ¼ of a turn).  
and refit the mounting screws.  
3. Check that the guide wheels are mounted se-  
curely.  
4. Remove the three clamping nuts and the two  
securing screws from the forward section of the  
saw arm, then remove the drive belt cover and  
the forward section of the saw arm.  
5. Release the four securing screws on the rear  
drive belt cover and remove the cover.  
6. Remove the stop screw that limits rotation of the  
forward section of the saw arm.  
7. Place the drive belt carefully over the drive pulley.  
8. Fit the forward section of the saw arm onto the  
rear section of the saw arm. Fit only the middle  
clamping nut. Tighten the nut only finger-tight.  
9. Rotate the disc guard until the opening is at the  
rear.  
10. Tension the drive belt by turning the belt tension-  
ing cam clockwise carefully as far as it will go  
(until resistance is felt, i.e. approx. ¼ of a turn).  
11. Secure the forward drive belt cover with the two  
clamping nuts and two securing screws.  
12. Tighten the three clamping nuts securely (18  
Nm).  
6.6 Saw carriage 6  
NOTE  
We recommend use of the saw carriage when the  
machine is used extensively for floor sawing.  
NOTE  
Especially when using the machine in this config-  
uration for the first time, check to ensure that the  
throttle cable is correctly adjusted. When the throttle  
control is pressed fully, the machine must run up to  
maximum speed. If this is not the case, the throttle  
cable can be readjusted by way of the cable tensioner.  
CAUTION  
Switch off the saw at the stop switch immediately if  
the throttle cable on the saw carriage gets stuck.  
DANGER  
Before starting the engine, check that the saw is  
correctly secured to the saw carriage.  
1. Move the cutting depth adjustment lever into the  
upper position.  
2. Open the hold-down device by releasing the  
13. Fit the rear drive belt cover and secure it with the  
four screws.  
14. Rotate the disc guard until the opening is at the  
front.  
15. Fit the spray jets in the openings at the front of  
screw knob.  
3. Fit the saw into the forward mount with the  
wheels as shown and swing the grip of the saw  
under the hold-down device.  
the blade guard.  
4. Secure the saw by tightening the screw knob.  
5. Fit the water tank after filling it.  
6. Adjust the grip to a convenient working height.  
7. Adjust the guard to the correct position.  
12  
7. Operation  
WARNING  
If you notice that the throttle trigger has jammed,  
stop the motor immediately by operating the on /  
off switch.  
en  
WARNING  
After fitting a new cutting disc, the machine must  
be allowed to run at full speed under no load for  
approx. 1 minute.  
7.1 Starting the motor 7  
CAUTION  
WARNING  
Working on the material may cause it to splinter.  
Wear eye protection and protective gloves. Wear  
breathing protection if no dust removal system is  
used. Splintering material presents a risk of injury to  
the eyes and body.  
Before using the machine, check to ensure that the  
start / stop switch functions correctly. The motor  
must stop running when the switch is moved to the  
“stop” position.  
1. Stand the machine on a solid surface on the  
floor.  
CAUTION  
The power tool and the cutting operation generate  
noise. Wear ear protectors. Exposure to noise can  
cause hearing loss.  
2. Move the start / stop switch to the “start” posi-  
tion.  
3. Press the fuel pump button (P) 2 to 3 times (until  
the pump button is seen to be completely filled  
with fuel).  
CAUTION  
The cutting disc and parts of the machine get hot dur-  
ing use. Wear protective gloves when changing the  
cutting disc. Touch the power tool only at the grips  
provided. You may otherwise burn your hands. Take  
care to ensure that the machine, when hot, does not  
come into contact with flammable materials during  
transport or storage.  
4. Press the decompression valve.  
5. If the motor is cold, pull the choke lever up-  
wards. This activates the choke and engages half  
throttle.  
6. If the motor is hot, pull the choke lever up and  
then push it back down. This engages half throttle  
(with no choke).  
7. Check that the cutting disc is free to rotate.  
8. Hold the forward grip securely with the left hand  
and place your right foot in the lower section of  
the rear grip.  
WARNING  
Keep other persons approx. 15 m away from your  
workplace. Pay special attention to the working  
area behind you.  
9. Pull the starter handle slowly with your right  
hand until resistance is felt.  
DANGER  
10. Pull the starter handle vigorously.  
11. When the motor fires for the first time (after 2 to  
5 pulls of the starter), move the choke lever back  
to its original position.  
Don’t work in closed rooms. Carbon monoxide, un-  
burned hydrocarbons and benzene in the exhaust gas  
may cause asphyxiation.  
WARNING  
12. Repeat this procedure, with the choke disen-  
When the motor is idling, the cutting disc must  
come to a complete stop. If this is not the case, the  
idling speed must be reduced accordingly. If this is  
not possible or does not achieve the desired result,  
the machine must be returned for repair.  
gaged, until the motor starts.  
NOTE The motor will flood if the starting proce-  
dure is repeated too many times with the choke  
engaged.  
13  
13. Press the throttle as soon as the motor starts.  
This disengages the half-throttle position and  
the choke (if previously engaged), and the motor  
then runs at idling speed when the throttle is  
released.  
7.2.1 Avoiding stalling 8  
CAUTION  
Avoid applying excessive pressure when cutting  
and don’t allow the cutting disc to stick and stall.  
Don’t attempt to cut to great depth immediately.  
Application of excessive pressure increases the risk  
of cutting disc distortion. Allowing the cutting disc to  
stick or stall increases the probability of kickback or  
disc breakage.  
en  
7.2 Cutting techniques  
DANGER  
Always hold the saw and the saw carriage securely  
with both hands on the grips provided. Keep the  
grips dry, clean and free from oil and grease.  
CAUTION  
Support slabs or large workpieces so that the kerf  
remains open during the cutting operation.  
DANGER  
Check that no persons are present within the work-  
ing area and, in particular, in the area ahead of the  
saw (in the cutting direction).  
7.2.2 Avoiding kickback 9  
CAUTION  
Always bring the machine into contact with the  
workpiece from above. Allow the cutting disc to  
contact the workpiece only at a point below its  
rotational axis.  
DANGER  
Guide the machine evenly and do not apply lat-  
eral pressure to the cutting disc. Always bring the  
machine into contact with the workpiece at right  
angles. Don’t attempt to alter the line of cut by  
applying lateral pressure or by bending the cutting  
disc while cutting is in progress. This presents a  
risk of damaging or breaking the cutting disc.  
CAUTION  
Take special care when inserting the cutting disc in  
an existing kerf.  
7.3 Stopping the motor  
WARNING  
If the motor cannot be stopped by operating the on  
/ off switch, the motor must be stopped, if need be,  
by pulling the choke lever.  
CAUTION  
Secure the workpiece and the part to be cut off in  
order to prevent uncontrolled movement.  
NOTE  
Always apply full throttle when cutting.  
WARNING  
Do not lay the machine down until the cutting disc  
has stopped rotating. The machine must always be  
stored and transported in an upright position.  
NOTE  
Avoid making excessively deep cuts. Cutting through  
thick workpieces should be accomplished, as far as  
possible, by making a several cuts.  
1. Release the throttle trigger.  
2. Move the start / stop switch to the “stop” posi-  
tion.  
8. Care and maintenance  
8.1 Maintenance  
8.1.1 Each day before use  
Check that the machine is complete and in faultless  
condition. Have it repaired if necessary.  
Check the machine for leakage. Have it repaired if  
necessary.  
WARNING  
Set the switch to “stop” before carrying out any  
maintenance or repairs and before cleaning the  
machine.  
14  
Check the machine for dirt and dust and clean it if NOTE  
necessary.  
In this machine, most of the dust is removed from  
the air flow by a maintenance-free cyclone-type pre-  
screening system. This preliminary air cleaning pro-  
cess greatly reduces the amount of maintenance  
required compared to conventional systems.  
Check that all operating controls function correctly.  
Have them repaired if necessary.  
Check that the cutting disc is in faultless condition.  
Replace it if necessary.  
en  
1. Release the securing screw on the air filter cover  
and remove the cover.  
2. Carefully remove the dust adhering to the air filter  
and the filter chamber (use a vacuum cleaner).  
3. Release the screws retaining the filter holder and  
remove the air filter.  
8.1.2 Every 6 months  
Check the tightness of all screws and nuts accessible  
from the outside.  
Check that the fuel filter is clean (no dirt or deposits)  
and replace it if necessary.  
Retension the drive belt if it slips when the cutting  
disc is under load.  
4. Fit the new filter and secure it with the filter  
holder.  
8.1.3 When necessary  
Check the tightness of all screws and nuts accessible  
from the outside.  
Replace the air filter if the machine doesn’t start or  
motor performance drops noticeably.  
Check that the fuel filter is clean (no dirt or deposits)  
and replace it if necessary.  
5. Fit the air filter cover and tighten the retaining  
screws.  
8.3 Replacing a broken starter cord 12  
CAUTION  
The housing may suffer damage if the starter cord is  
too short. Never shorten the starter cord.  
Clean or replace the spark plug if the machine doesn’t  
start or is difficult to start.  
Retension the drive belt if it slips when the cutting  
disc is under load.  
Readjust the motor idling speed if the cutting disc  
1. Unscrew the three securing screws and remove  
the starter assembly.  
2. Remove the remaining pieces of the starter cord  
from the spool and the starter handle.  
3. Make a secure knot in the end of the replacement  
starter cord and then pass the free end of the  
cord through the hole in the spool from above.  
4. Pass the end of the cord through the opening  
in the starter housing from below, also through  
the starter handle from below, and then make a  
secure knot in the end of the cord.  
doesn’t stop rotating when the machine is idling.  
8.2 Replacing the air filter 10 11  
5. Pull a length of the starter cord out of the housing  
as shown in the illustration and pass it through  
the slot in the spool.  
6. Hold the cord securely close to the slot in the  
spool and then rotate the spool in a clockwise  
direction as far as it will go.  
7. Rotate the spool back from its end point at least  
a ½ revolution, max. 1 ½ revolutions, until the  
slot in the spool is in alignment with the opening  
in the starter housing.  
8. Hold the spool securely and pull the free end of  
the cord at the starter handle out of the housing.  
9. Hold the cord under tension, release the spool  
and allow the starter cord to be pulled in.  
DANGER  
The operator and bystanders must wear breathing  
protection if the work causes dust.  
CAUTION  
Dust entering the machine may cause irreparable  
damage. Never operate the machine if the air filter  
is damaged or missing. When changing the air filter,  
the machine should stand upright and should not be  
laid on its side. Take care to ensure that no dust finds  
its way onto the underlying filter screen.  
NOTE  
Change the air filter if motor performance drops  
noticeably or if the machine becomes difficult to  
start.  
15  
10. Pull the starter cord out as far as it will go and 6. Move the start / stop switch to the “start” posi-  
check to ensure that the spool can be turned  
by hand at least a further ½ turn in a clock-  
wise direction. If this is not possible, spring  
tension must be reduced by one revolution in a  
counterclockwise direction.  
tion.  
7. CAUTION Avoid touching the spark plug elec-  
trode.  
Pull the starter cord (press the decompression  
valve first).  
en  
11. Fit the starter assembly to the machine and press  
An ignition spark must now be clearly visible.  
8. Use the spark plug wrench to screw the spark  
plug into the cylinder (12 Nm).  
it down gently.  
Pull the starter cord slightly until the coupling  
engages and the starter assembly is fully seated.  
12. Secure the starter assembly with the three re-  
taining screws.  
9. Fit the ignition cable connector to the spark plug.  
8.6 Retensioning the drive belt 15  
CAUTION  
8.4 Checking and replacing the fuel filter 13  
A slack drive belt can damage the machine. Reten-  
sion the drive belt if it slips when a load is applied to  
the cutting disc.  
NOTE  
Check the condition of the fuel filter regularly.  
NOTE  
NOTE  
When refueling the machine, take care to ensure that  
no dirt or foreign matter finds its way into the fuel  
tank.  
The drive belt must be replaced as soon as the  
wear mark on the saw arm becomes visible after  
retensioning.  
1. Remove the cap from the fuel tank.  
2. Pull the fuel filter out of the fuel tank.  
3. Check the condition of the fuel filter.  
The filter must be replaced if badly soiled.  
4. Push the fuel filter back into the fuel tank.  
5. Close the cap on the fuel tank.  
This machine is equipped with a semi-automatic,  
spring-assisted drive belt tensioning system.  
1. Slacken the three clamping nuts on the forward  
section of the saw arm approx. one complete  
turn.  
2. After releasing the nuts, the drive belt is ten-  
sioned automatically by spring pressure.  
3. Retighten the three clamping nuts securely (18  
Nm).  
8.5 Cleaning the spark plug / setting the spark  
plug gap / replacing the spark plug 14  
CAUTION  
8.7 Changing the drive belt 16  
NOTE  
The spark plug and parts of the motor may be hot  
immediately after the machine has been running. To  
avoid burning your hands, wear suitable protective After doing this, check that the cutting disc can be  
gloves or allow the machine to cool down before turned easily by hand and that all screws have been  
touching its parts.  
tightened securely.  
Use only spark plugs of the type NGKCMR7A-5.  
1. Use a gentle twisting motion to pull the cable  
connector off the spark plug.  
2. Use the spark plug wrench to unscrew and re-  
move the spark plug from the cylinder.  
3. If necessary, clean the spark plug electrode with  
a soft wire brush.  
1. Slacken the three clamping nuts on the forward  
section of the saw arm approx. one complete  
turn.  
2. Release the tension on the drive belt by turning  
the belt tensioning cam counterclockwise care-  
fully as far as it will go (until resistance is felt,  
i.e. approx. ¼ of a turn).  
3. Remove the upper and lower clamping nuts and  
the two securing screws from the forward section  
of the saw arm and remove the drive belt cover.  
4. Release the four securing screws on the rear  
drive belt cover and remove the cover.  
4. Check the spark plug gap (0.5 mm) with the aid  
of a feeler gauge and reset it to the correct gap if  
necessary.  
5. Fit the ignition cable connector to the spark plug  
and hold the threaded section of the spark plug  
against the cylinder.  
16  
5. Remove the defective drive belt. Place the new  
drive belt carefully over the two drive pulleys.  
6. Tension the drive belt by turning the belt tension-  
ing cam clockwise carefully as far as it will go  
(until resistance is felt, i.e. approx. ¼ of a turn).  
7. Fit the rear drive belt cover and secure it with the  
four screws.  
8. Secure the forward drive belt cover with the two  
clamping nuts and two securing screws.  
9. Tighten the three clamping nuts securely (18  
Nm).  
8.10 Maintenance  
Check all external parts of the machine and the  
accessories for damage at regular intervals and check  
that all controls operate faultlessly. Don’t operate the  
machine if parts are damaged or when the controls  
do not function faultlessly. If necessary, the machine  
should be repaired by Hilti Service.  
en  
8.11 Checking the power tool after care and  
maintenance  
After carrying out care and maintenance, check that  
all protective and safety devices are fitted and that  
they function faultlessly.  
8.8 Adjusting the carburetor 17  
CAUTION  
Tampering with the carburetor settings may cause  
damage to the motor.  
8.12 Transporting the machine in a vehicle  
The carburetor of this machine (jets H and L) has been  
factory set for optimum performance and sealed to  
prevent tampering. The idling speed of the machine  
(jet T) may be adjusted by the user. All other adjust-  
ments must be carried out at a Hilti service center.  
NOTE  
CAUTION  
To avoid a fire hazard, allow the machine to cool  
down completely before transporting it.  
Use a suitable flat screwdriver (tip width 4 mm/ /₃₂ ")  
and do not force the adjusting screw beyond its  
intended adjustment range.  
CAUTION  
The fuel tank must be completely empty before  
the machine is shipped by a parcels service. We  
recommend that the original packaging is kept for  
use in the event of a need to transport the machine  
in this way.  
1. Clean the air filter.  
2. Allow the machine to run until it reaches its  
normal operating temperature.  
3. Adjust the idling speed jet (T) so that the motor  
runs smoothly when idling but the cutting disc  
does not begin to rotate.  
1. Remove the cutting disc.  
2. Secure the machine to prevent it falling over,  
causing damage or fuel spillage.  
3. Transport the saw carriage only when the water  
tank is empty.  
8.9 Cleaning  
Careful cleaning of the machine is one of the main  
prerequisites for trouble-free, reliable operation.  
Heavy dirt and dust deposits on the motor and in the  
cooling openings may lead to overheating.  
Don’t permit foreign objects to enter the interior of  
the machine.  
8.13 Storing the machine for a long period of  
time  
DANGER  
Store machines in a secure place when not in use.  
When not in use, machines must be stored in a dry,  
high place or locked away out of reach of children.  
Don’t use a high pressure jet system or running water  
for cleaning.  
Don’t use cleaning agents which contain silicone.  
Clean the exterior of the machine at regular intervals  
with a slightly damp cloth or a dry brush.  
Check that all grips are clean, dry and free from oil  
and grease.  
1. Empty the fuel tank and then start the motor and  
allow it to idle until all remaining fuel is used up.  
2. Remove the cutting disc.  
17  
3. Clean the machine thoroughly and grease the 6. Pull the starter handle a few times.  
metal parts.  
This will distribute the oil in the cylinder.  
7. Replace the spark plug.  
8. Wrap the machine in plastic foil.  
9. Put the machine into storage.  
4. Remove the spark plug.  
5. Pour a little two-stroke oil into the cylinder (1 to  
2 teaspoons).  
en  
9. Troubleshooting  
Fault  
Possible cause  
Excessive cutting pressure applied  
(cutting disc sticks and stalls in the the machine in a straight line.  
kerf).  
Remedy  
Reduce cutting pressure and guide  
Cutting disc slows down or  
stops completely while cut-  
ting  
Drive belt tension too low or the  
drive belt is broken.  
Re-tension the drive belt or fit a  
new belt.  
Cutting disc incorrectly fitted or not Check that the disc is fitted and  
tightened properly. tightened correctly.  
Cutting disc direction of rotation is Check the direction of rotation and  
incorrect.  
correct if necessary.  
Tighten the clamping nuts.  
The forward section of the saw arm  
is loose.  
High vibration, disc wanders  
off the cutting line  
Cutting disc incorrectly fitted or not Check that the disc is fitted and  
tightened properly.  
tightened correctly.  
Fit a new cutting disc.  
Cutting disc is damaged (or unsuit-  
able specification, cracked, seg-  
ments missing, bent, overheated,  
deformed, etc.).  
The centering bushing is fitted in-  
correctly.  
Check that the mounting bore of  
the cutting disc to be fitted corre-  
sponds with the centering collar of  
the cutting disc mounting flange.  
Saw doesn’t start or is diffi-  
cult to start  
The fuel tank is empty (no fuel in  
the carburetor).  
Fill the fuel tank.  
Air filter clogged with dirt or dust.  
Replace the air filter.  
Dry the spark plug and cylinder  
(remove the spark plug).  
Disengage the choke lever and re-  
peat the starting procedure several  
times.  
The motor is flooded (spark plug  
wet).  
Wrong fuel mixture.  
Empty the fuel tank and flush out  
the tank and fuel lines. Fill the tank  
with the correct fuel.  
Air in the fuel line (no fuel reaching Remove the air from the fuel line  
the carburetor).  
by operating the fuel pump several  
times.  
The fuel filter is dirty or blocked  
(no fuel or too little fuel reaching  
the carburetor).  
Clean the tank and fit a new fuel  
filter.  
18  
Fault  
Possible cause  
Remedy  
No ignition spark visible or spark  
is too weak (when spark plug is  
removed).  
Saw doesn’t start or is diffi-  
cult to start  
Clean the spark plug to remove  
carbon deposits.  
Check the spark plug gap and ad-  
just it if necessary.  
Fit a new spark plug.  
en  
Check the ignition coil, cable, con-  
nectors and switch and replace the  
parts if necessary.  
Motor compression is too low.  
Very low temperatures.  
Check the motor compression and,  
if necessary, replace worn parts  
(piston rings, cylinder, etc.  
Allow the machine to warm up  
slowly to room temperature and  
repeat the starting procedure.  
Dirt or dust in the spark guard /  
exhaust exit.  
Clean the parts.  
Release the valve.  
The decompression valve is stiff to  
operate.  
Low motor power / poor cut-  
ting performance  
Air filter clogged with dirt or dust.  
Replace the air filter.  
Clean the spark plug to remove  
carbon deposits.  
No ignition spark visible or spark  
is too weak (when spark plug is  
removed).  
Check the spark plug gap and ad-  
just it if necessary.  
Fit a new spark plug.  
Check the ignition coil, cable, con-  
nectors and switch and replace the  
parts if necessary.  
The wrong fuel or dirt and water in Flush out the fuel system, replace  
the fuel tank. the fuel filter and refill with fuel.  
The disc specification is unsuitable Change the specification or request  
for the material to be cut.  
advice from Hilti.  
Drive belt or cutting disc slips.  
Check the drive belt tension and  
disc clamping parts and eliminate  
the fault.  
Motor compression is too low.  
Check the motor compression and,  
if necessary, replace worn parts  
(piston rings, cylinder, etc.  
The machine is operated or han-  
dled incorrectly (excessive cut-  
ting pressure applied, cutting disc  
overheats, disc sticks in the kerf,  
unsuitable disc type, etc.).  
Observe the information provided  
in the operating instructions.  
Have the carburetor adjusted by  
Hilti Service.  
Working at an altitude of more than  
1500 m (4900 ft) above sea level.  
Have the carburetor adjusted by  
Hilti Service.  
Incorrect carburetor setting (fuel /  
air mixture).  
19  
Fault  
Possible cause  
Remedy  
Idling speed is too high.  
Cutting disc rotates while the  
motor is idling  
Check the idling speed and adjust if  
necessary.  
The half-throttle position is en-  
gaged.  
Faulty centrifugal clutch.  
Disengage the half-throttle setting.  
en  
Replace the centrifugal clutch.  
The clutch claws are not engaging.  
Starter unit doesn’t work  
Clean the parts so that they can  
move freely.  
10. Disposal  
Most of the materials from which Hilti machines or appliances are manufactured can be recycled. The  
materials must be correctly separated before they can be recycled. In many countries, Hilti has already made  
arrangements for taking back old machines and appliances for recycling. Ask Hilti customer service or your  
Hilti representative for further information.  
NOTE  
Disposing of slurry directly into rivers, lakes or the sewerage system without suitable pretreatment presents  
environmental problems. Ask the local public authorities for information about current regulations.  
1. Collect the slurry (e.g. using a wet-type industrial vacuum cleaner)  
2. Allow the slurry to settle and dispose of the solid material at a construction waste disposal site (the  
addition of a flocculent may accelerate the separation process).  
3. The remaining water (alkaline, pH value > 7) must be neutralized by the addition of an acidic neutralizing  
agent or diluted with a large volume of water before it is allowed to flow into the sewerage system.  
11. Federal emission control warranty statement  
control system includes parts such as the carburetor  
and the ignition system. Where a warrantable condi-  
tion exists, Hilti will repair your small non-road engine  
at no cost to you. Expenses covered under warranty  
include diagnosis, parts and labor.  
Your warranty rights and obligations  
The U.S. Environmental Protection Agency (EPA), the  
California Air Resources Board (CARB), and Hilti are  
pleased to explain the Emission Control System War-  
ranty applicable to your small non-road engine. In  
U.S. and Canada, small non-road engines must be  
designed, built and equipped to meet the stringent  
federal antismog standards. The equipment engine  
must be free from defects in materials and work-  
manship which cause it to fail to conform with U.S.  
EPA standards for the first two years of engine use  
from the date of sale to the ultimate purchaser. Hilti  
must warrant the emission control system on your  
small non-road engine for the periods of time listed  
above, provided there has been no abuse, neglect or  
improper maintenance of your unit. Your emission  
Manufacturer’s warranty coverage  
All 2001 and later small non-road engines are war-  
ranted to meet the applicable EPA and CARB require-  
ments for two years. If any emission related part on  
your engine (as listed above) is defective, the part will  
be repaired or replaced by Hilti.  
Owner’s warranty responsibilities  
As a small non-road engine owner, you are respon-  
sible for performance of the required maintenance as  
20  
at no cost to the owner. Hilti shall remedy warranty  
defects at authorized Hilti service and repair centers.  
Any authorized work done at an authorized Hilti ser-  
defined by Hilti in the owner’s manual. Hilti recom-  
mends that you retain all receipts covering mainte-  
nance on your small non-road engine, but Hilti cannot  
deny warranty solely for the lack of receipts or for vice and repair center shall be free of charge to the  
owner if it is determined that a warranted part is  
defective. Any manufacturer-approved or equivalent  
replacement part may be used for any warranty main-  
tenance or repairs on emission-related parts, and  
must be provided free of charge to the owner if the  
part is still under warranty. Hilti is liable for damages  
to other engine components caused by the failure of  
a warranted part still under warranty. The California  
Air Resources Board’s Emission Warranty Part List  
specifically defines the emission related, warranted  
your failure to ensure the performance of all sched-  
uled maintenance. Any replacement part or service  
that is equivalent in performance and durability may  
be used in non-warranty maintenance or repairs, and  
shall not reduce the warranty obligations of the en-  
gine manufacturer. As the small non-road equipment  
engine owner, you should be aware, however, that  
Hilti may deny you warranty coverage if your small  
non-road engine or a part en of it has failed due to  
abuse, neglect, improper maintenance, unapproved  
en  
modifications or the use of parts not made or ap- parts. These warranted parts are: the carburetor as-  
sembly, coil assembly, rotor, spark plug, air filter,  
fuel filter, breather manifold and the gaskets.  
proved by the original equipment manufacturer. You  
are responsible for presenting your small non-road  
engine to Hilti as soon as the problem exists. The  
warranty repairs should be completed in a reasonable  
amount of time, not to exceed 30 days.  
Maintenance requirements  
The owner is responsible for performing the required  
maintenance as defined by Hilti in the owner’s manual.  
Coverage  
Limitations  
Hilti warrants to the ultimate purchaser and each sub-  
sequent purchaser that your small non-road equip-  
ment engine will be designed, built equipped, at the  
time of sale, to meet all applicable regulations. Hilti  
also warrants to the initial purchaser and each subse-  
quent purchaser that the emission-related warranted  
parts are free from defects in material and work-  
manship which cause the engine to fail to conform  
with applicable regulations for a period of two years.  
These warranty periods will begin on the date small  
non-road equipment engine is purchased by the ini-  
tial purchaser. If any emission-related part on your  
engine is defective, the part will be replaced by Hilti  
The Emission Control Systems Warranty shall not  
cover any of the following: a) repair or replacement  
required because of misuse, neglect or lack of re-  
quired maintenance, b) repairs improperly performed  
or replacements not conforming to Hilti specifications  
that adversely affect performance and/or durability,  
and alterations or modifications not recommended or  
approved in writing by Hilti, and c) replacement of  
parts and other services and adjustments necessary  
for required maintenance at and after this first sched-  
uled replacement point. Except as set forth above, the  
warranty terms set forth in section 12 below, apply.  
12. Manufacturer’s warranty  
Hilti warrants that the tool supplied is free of defects ment as a result of normal wear and tear are not  
in material and workmanship. This warranty is valid covered by this warranty.  
so long as the tool is operated and handled correctly,  
Additional claims areexcluded, unlessstringent na-  
tional rules prohibit such exclusion. In particular,  
Hilti is not obligated for direct, indirect, inciden-  
tal or consequential damages, losses or expenses  
in connection with, or by reason of, the use of,  
or inability to use the tool for any purpose. Im-  
cleaned and serviced properly and in accordance with  
the Hilti Operating Instructions, and the technical  
system is maintained. This means that only original  
Hilti consumables, components and spare parts may  
be used in the tool.  
This warranty provides the free-of-charge repair or plied warranties of merchantability or fitness for a  
replacement of defective parts only over the entire particular purpose are specifically excluded.  
lifespan of the tool. Parts requiring repair or replace-  
21  
For repair or replacement, send the tool or related This constitutes Hilti’s entire obligation with regard  
parts immediately upon discovery of the defect to to warranty and supersedes all prior or contempo-  
the address of the local Hilti marketing organization raneous comments and oral or written agreements  
provided.  
concerning warranties.  
en  
22  

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