Stiga Lawn Mower 8211 0276 02 User Manual

STIGA PARK  
PRO 20  
PRO 16  
ROYAL  
PRESIDENT  
SENATOR  
8211-0276-02  
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PARK  
10  
11  
11  
14  
9
7
7
9
4. Senator  
5. President  
13  
11  
14  
11  
14  
15  
8
8
9
7
7
9
16  
15  
6. Royal  
13  
7. Pro 16  
13  
14  
14  
8
8
9
9
12  
7
7
12  
16  
15  
15  
16  
18  
17  
9. Pro 20  
8. Pro 18  
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PARK  
1
2
2
1
10.  
11.  
13. Senator - President  
15. Pro 16 - Pro 18 - Pro 20  
17. Royal  
12.  
14. Royal  
OPEN  
16.  
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PARK  
19. Senator - President  
18. Pro 16 - Pro 18 - Pro 20  
20. Royal  
21. Pro 16 - Pro 18 - Pro 20  
0.75 mm  
23.  
22. Pro 18 - Pro 20  
24. Senator - President  
25. Royal - Pro 16 - Pro 18 - Pro 20  
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PARK  
26.  
27.  
MAX  
29a. President - Royal  
28.  
29b. Pro 16 - Pro 18 - Pro 20  
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1. IMPLEMENT LIFTER  
GENERAL  
A pedal for raising front-mounted accessories to  
the transport position.  
This symbol indicates WARNING. Per-  
sonal injury and/or damage to property  
may result if the instructions are not  
followed carefully.  
To lift up the accessory, press the pedal down as far  
as it will go. Then release the pedal, the implement  
lifter is now locked in the lift position.  
You must read these instructions for use  
and the accompanying pamphlet  
“SAFETY INSTRUCTIONS” careful-  
ly, before starting up the machine.  
To lower the accessory, press the pedal down so  
that the lock is released. Lower the implement lift-  
er to the working position by slowly lifting your  
foot from the pedal.  
SYMBOLS  
2. LIFT HELP (Pro18 - Pro20)  
The following symbols are displayed on the ma-  
chine in order to remind you about the safety pre-  
cautions and attention necessary when using the  
machine.  
The implement lifter is complemented with adjust-  
able lift help in the form of a gas spring. This facil-  
itates lifting heavy accessories.  
Under the engine casing, on the top of the rear  
bumper, there is a setting crank.  
The symbols mean:  
Warning!  
Use this to increase/decrease the lift help.  
Read the instruction book and safety man-  
ual before using the machine.  
Screw anti-clockwise to increase the  
lift help if heavy accessories are be-  
ing used.  
Warning!  
Beware of objects being flung out. Keep  
spectators away.  
Screw clockwise to decrease the lift  
help if lighter accessories are being  
used.  
Warning!  
Always use hearing protectors.  
3A. SERVICE BRAKE/CLUTCH  
(Senator)  
Warning!  
This machine is not designed to be driven  
on public roads.  
A pedal that combines both service brake and  
clutch. Three positions:  
Warning!  
1. Pedal released – forward drive  
engaged. The machine will  
move if a gear is engaged. Serv-  
ice brake not activated.  
The machine, equipped with original ac-  
cessories, must not be driven in any direc-  
tion on slopes with a gradient greater than  
10º.  
2. Pedal depressed halfway –  
forward drive disengaged, gear  
shifting can be performed. Serv-  
ice brake not activated.  
Warning!  
Clamp risk. Keep hands and feet well  
away from the articulated steering joint.  
Warning!  
3. Pedal fully depressed – for-  
ward drive disengaged. Service  
brake fully activated.  
Risk for burn injuries. Do not touch the si-  
lencer/catalytic converter.  
NOTE! You must never regulate the operating  
speed by slipping the clutch. Use a suitable gear in-  
stead, so that the right speed is obtained.  
CONTROLS AND  
INSTRUMENTS  
3B. SERVICE BRAKE (President -  
Royal - Pro16 - Pro18 - Pro20)  
Items 1 - 20, see figures 1 - 9  
A pedal that acts upon the machine’s braking sys-  
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tem. There are 3 positions:  
1. Pedal released – service brake  
7. THROTTLE/CHOKE CONTROL  
A control for setting the engine speed and to choke  
the engine when starting from cold (the latter does  
not apply to Royal-Pro16-Pro18-Pro20 which  
have separate choke control – see item 8).  
not activated.  
2. Pedal depressed halfway –  
forward drive disengaged. Serv-  
ice brake not activated.  
1. Choke – for starting a cold engine. The  
choke is located in top of groove (does not  
apply to Royal- Pro16-Pro18-Pro20).  
3. Pedal fully depressed – for-  
ward drive disengaged. Service  
brake fully activated.  
2. Full throttle – when the machine is in  
operation, full throttle should always be  
used.  
4. PARKING BRAKE  
An inhibitor that can lock the brake pedal in the de-  
pressed position.  
3. Idle running.  
Depress the brake pedal fully. Move the  
inhibitor to the right and then release the  
brake pedal.  
8. CHOKE CONTROL (Royal - Pro16 -  
Pro18 - Pro20)  
The parking brake is released by pressing the brake  
pedal. The spring-loaded inhibitor slides to one  
side.  
A pull-type control to choke the engine when start-  
ing from cold.  
1. Control fully pulled out – choke valve  
in carburettor closed. For starting cold en-  
gine.  
Make sure that the parking brake is released when  
operating the machine.  
5. DRIVE PEDAL (President - Royal -  
Pro16 - Pro18 - Pro20)  
2. Control pushed in – choke valve open.  
For starting warm engine and when oper-  
ating the machine.  
A pedal that activates the variable transmission.  
Never operate the machine with the choke  
pulled out when the engine is warm.  
1. Depress the pedal with the  
ball of your foot – the machine  
moves forwards.  
9. IGNITION LOCK/SPOTLIGHT  
2. No load on the pedal – the ma-  
chine is stationary.  
Ignition lock used for starting/stopping the engine.  
Also includes switch for spotlight (Senator does  
not have a spotlight). Four positions:  
3. Depress the pedal with your  
heel – the machine reverses.  
1. Stop position – the engine is short-  
circuited. The key can be removed.  
The drive pedal regulates the speed. The more  
pressure applied, the faster the machine will move.  
2. Operating position – spotlight activat-  
ed.  
6. ADJUSTABLE STEERING WHEEL  
(President - Royal - Pro16 - Pro18 -  
Pro20)  
3. Operating position – spotlight not acti-  
vated.  
The steering wheel can be adjusted vertically in 5  
positions. Press in the inhibitor on the steering col-  
umn and raise or lower the steering wheel to the  
desired position.  
4. Start position – the electric start motor  
is activated when the key is turned to the  
spring-loaded start position. Once the en-  
gine has started, let the key return to oper-  
ating position 3.  
Do not adjust the steering wheel during opera-  
tion.  
To turn on the spotlight, turn the key to position 2.  
NOTE! If the key is turned from the stop posi-  
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tion to operating position 2, the spotlight is acti-  
vated. This uses up battery power. Do not leave  
the machine with the key in position 2 (applies  
to Pro16-Pro18-Pro20).  
tion.  
2. Backward position – the differential in-  
hibitor is engaged. For normal operation.  
Works for both forward and reverse drive.  
10. GEAR LEVER (Senator)  
The differential lever is of greatest use when the  
rear wheels are unevenly loaded. For example,  
when driving across a slope, where the upper rear  
wheel is not as loaded, as wheel as when turning  
sharp corners where the inner rear wheel bears a  
lesser load.  
A lever for selecting one of the five forward gears  
in the gearbox (1-2-3-4-5), neutral (N) or reverse  
(R).  
The clutch pedal must be kept pressed in when  
changing gear.  
When driving during the winter on slippery surfac-  
es, the drive capacity is improved if snow chains  
are not used.  
NOTE! You must make sure the machine is quite  
stationary before changing from reverse to forward  
gear or vice versa. If a gear does not engage imme-  
diately, release the clutch pedal and then press it in  
once again, then engage the gear once again. Never  
force a gear in.  
When the differential inhibitor is engaged, the  
steering is heavy. Avoid turning the steering  
wheel!  
14. HOUR METER (President - Royal  
- Pro16 - Pro18 - Pro20)  
11. POWER TAKE-OFF (Senator -  
President - Royal - Pro16)  
Indicates the number of working hours. Only  
works when the engine is running.  
A lever for engaging and disengaging the power  
take-off for driving front-mounted accessories.  
There are two positions:  
15. CRUISE CONTROL (Royal - Pro16  
- Pro18 - Pro20)  
1. Lever in forward position – power take-  
off disengaged.  
A switch for activating the cruise control. The  
function of the cruise control allows the drive ped-  
al (5) to be locked in the desired position. You do  
not need to use your right foot.  
2. Lever in backward position - power  
take-off engaged.  
1. Press down the drive pedal until the de-  
sired speed is obtained. Then press the  
front part of the switch to activate the  
cruise control. The symbol will light up.  
12. POWER TAKE-OFF (Pro18 -  
Pro20)  
Switch for engaging/disengaging the electromag-  
netic power take-off for driving front-mounted ac-  
cessories. There are two positions:  
2. Disengage the cruise control by press-  
ing the rear part of the switch.  
1. Press the front part of the switch – the  
power take-off is engaged. The symbol  
lights up.  
16. CUTTING HEIGHT ADJUSTMENT  
(Pro16 - Pro18 - Pro20)  
2. Press the rear part of the switch – the  
power take-off is disengaged.  
The machine is equipped with a control for using  
the mower deck with electrical cutting height ad-  
justment (available as an accessory).  
13. DIFFERENTIAL INHIBITOR  
(Pro16 - Pro18 - Pro20)  
The switch is used to adjust the cutting  
height in continuously variable positions.  
Lever for engaging the differential inhibitor. This  
improves the towing capacity by locking the rear  
wheels so that both wheels drive simultaneously.  
There are two positions:  
The contact used for connecting the mower deck is  
mounted on the right side, in front of the front tyre  
(fig. 2).  
17. REAR RAKE (Pro20)  
1. Forward position – the differential in-  
hibitor is not engaged. For normal opera-  
The machine has been designed for electrical ad-  
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justment of a rear rake (available as an accessory).  
1. Mowing  
The switch is used to raise and lower the  
rear rake.  
Using mower deck 13-2927 (107M), 13-2917  
(110S), 13-2915/13-2921 (121M) or flail mow-  
er 13-1977.  
Connection cables for the rake are located to the  
rear of the machine, to the left on the top of the  
bumper (Pro16 and Pro18 are prepared for a rear  
rake).  
2. Sweeping  
Using brush unit 13-1933 or collector brush  
unit 13-1939. Use of dust guard 13-1936 is rec-  
ommended with the first option.  
18. SAND SPREADER (Pro20)  
3. Snow clearance  
The machine has been designed for electrical ad-  
justment of a sand spreader (available as an acces-  
sory).  
Using snow blade 13-1916 or snow thrower 13-  
1948. Snow chains 13-1956 (16”)/13-0902  
(17”) and wheel weights 13-1982 are recom-  
mended.  
The switch is used to start and stop the  
12V  
spreader.  
4. Grass clipping and leaf collection  
A connection contact for the sand spreader is locat-  
ed to the rear of the machine, to the left on the top  
of the bumper (Pro16 and Pro18 are prepared for a  
sand spreader).  
Using towed collector 13-1978 (30”) or 13-  
1950 (42”).  
5. Grass and leaf transport  
Using dump cart 13-1979 (Standard), 13-1988  
(Maxi) or 13-1992 (Combi).  
19. DISENGAGING LEVER (Presi-  
dent - Royal - Pro16 - Pro18 - Pro20)  
6. Sand spreading  
A lever for disengaging the variable transmission.  
Enables the machine to be moved by hand without  
the help of the engine. There are two positions:  
Using sand spreader 13-1975. Can also be used  
for spreading salt. Snow chains 13-1956 (16”)/  
13-0902 (17”) and wheel weights 13-1982 are  
recommended.  
1. Lever moved back – transmis-  
sion engaged for normal opera-  
tion.  
7. Weeding on gravel paths  
Using front mounted hoe 13-1944 and rear-  
mounted rake 13-1969.  
2. Lever moved forward – trans-  
mission disengaged. The ma-  
chine can be moved by hand.  
8. Lawn edge trimming  
Using edge trimmer 13-0905.  
9. Moss scarification  
To avoid damage to the transmission, do not tow  
the machine for any great distance.  
20. FUEL GAUGE/FUEL CAP  
Using moss scarifier 13-1984.  
Fuel cap with built-in fuel gauge that indi-  
cates how much fuel there is in the fuel  
tank. (applies to Royal-Pro16-Pro18-  
Pro20)  
The maximum vertical load on the towing hitch  
must not exceed 100 N.  
The maximum over-run load on the towing hitch  
from towed accessories must not exceed 500 N.  
Senator and President have a fuel cap without a  
fuel gauge.  
NOTE! Before using a trailer – contact your insur-  
ance company.  
The fuel tank has a capacity of 11.5 l.  
NOTE! This machine is not intended to be driven  
on public roads.  
AREAS OF USE  
The machine may only be used for the following  
tasks using the STIGA accessories stated.  
11  
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CHECKING THE ENGINE OIL LEVEL  
START AND OPERATING  
On delivery, the crankcase is filled with SAE 30  
oil.  
ENGINE CASING  
Check the oil level every time before using to  
ensure that it is correct. The machine should be  
standing on level ground.  
To inspect and maintain the engine and battery, re-  
move the engine casing as follows:  
1. Unscrew the fuel cap/fuel gauge.  
2. Carefully lift off the engine casing (fig. 10).  
Assembly:  
Wipe clean round the oil dipstick, remove  
it and wipe off. Push down the dipstick  
fully and screw it back in.  
Then unscrew it and pull it up again. Read off the  
oil level. Top up with oil to the “FULL” mark, if  
the level comes below it (figs. 13 - 15).  
1. Make sure that the front part of the casing fits  
into the track in the U-shaped attachment on the  
machine (fig. 11).  
CHECKING THE TRANSMISSION  
OIL LEVEL (President - Royal - Pro16  
- Pro18 - Pro20)  
2. Place the casing over the lip on each side  
(fig. 11).  
3. Make sure that the pins on the back edge of the  
casing go down into the respective holes (fig. 12).  
The transmission is filled with SAE 10W-40 oil  
when the machine is delivered from the factory,  
4. Finally, screw in the fuel cap/fuel gauge.  
Check the oil level every time before using to  
ensure it is correct. The machine should be  
standing on level ground.  
Do not use the machine without first fit-  
ting the engine casing, otherwise there  
is a risk of burn injuries or crushing ac-  
cidents.  
Read off the oil level in the reservoir (fig. 29). It  
should be between the MAX and MIN marks. If  
necessary, top up with SAE 10W-40 (20W-50) oil.  
FILLING THE FUEL TANK  
Always use lead-free petrol. Never use oil-mixed  
petrol.  
SAFETY SYSTEM  
This machine is equipped with a safety system that  
consists of:  
- a switch on the gearbox (only Senator).  
- a switch at the brake pedal.  
NOTE! Bear in mind that petrol is a perishable; do  
not purchase more petrol than can be used within  
thirty days.  
Environmentally friendly petrol can be used. This  
type of petrol has a composition that is less hazard-  
ous for people and nature.  
- a switch in the seat mounting (Senator, Presi-  
dent) or the seat bracket (other models).  
- a switch at the power take-off engagement.  
Petrol is highly inflammable. Always  
store petrol in containers that are made  
especially for this purpose.  
In order to start the machine, the following are nec-  
essary:  
- gear lever in neutral (only Senator).  
- brake pedal pressed down.  
- driver sitting on seat.  
- power take-off engagement lever at lowest set-  
ting (i.e. power take-off disengaged).  
Only fill or top up with petrol outdoors,  
and never smoke when filling or top-  
ping up. Fill with petrol before starting  
the engine. Never remove the filler cap  
or fill with petrol while the engine is  
running or still warm.  
Always check the operation of the safe-  
ty system before using the machine!  
Never completely fill the fuel tank. Leave an emp-  
ty space (= at least the entire filler tube plus 1 - 2  
cm at the top of the tank) to allow the petrol to ex-  
pand when it warms up without overflowing (fig.  
28).  
With the engine operating and the driver sitting on  
the seat, check in the following way:  
- select a gear, lift your weight off the seat – the  
engine must stop (applies to Senator).  
- press the drive pedal so that the machine starts  
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to move, release the drive pedal – the machine  
in gradually if it has been used.  
must stop (applies to President, Royal, Pro16,  
Pro18, Pro20).  
- press the drive pedal so that the machine starts  
to move, engage the cruise control, lift your  
weight off the seat – the machine must stop (ap-  
plies to Royal, Pro16, Pro18, Pro20).  
- press the drive pedal so that the machine starts  
to move, engage the cruise control, press the  
brake pedal – the machine must stop (applies to  
Royal, Pro16, Pro18, Pro20).  
- engage the power take-off, lift your weight off  
the seat – the engine must stop (applies to Sen-  
ator, President, Royal, Pro16).  
9. When starting from cold, do not make the ma-  
chine work under load immediately, but let the en-  
gine run for some minutes first. This will allow the  
oil to warm up.  
When in use, always operate the engine at full  
throttle.  
STOPPING  
Disengage the power take-off and apply the park-  
ing brake.  
Allow the engine to idle 1 - 2 mins. Stop the engine  
by turning off the ignition key.  
- engage the power take-off, lift your weight off  
the seat, the power take-off must be disengaged  
(applies to Pro18, Pro20).  
Shut off the petrol cock. This is particularly impor-  
tant if the machine is to be transported on a trailer  
for example.  
Do not use the machine if the safety sys-  
tem does not work! Take the machine to  
a service agent for inspection!  
If the machine is left unattended, re-  
move the lead from the spark plug. Also  
remove the starter key.  
STARTING ENGINE  
The engine may be very warm immedi-  
ately after it is shut off. Do not touch the  
silencer, cylinder or cooling flanges as it  
can cause burns and injury.  
1. Open the fuel cock (fig. 16).  
2. Make sure that the sparking plug cable is prop-  
erly in place.  
3. Check to make sure that the power take-off is  
disengaged.  
CATALYTIC CONVERTER (Pro18 -  
Pro20)  
4a. Senator:  
Put the gear lever in neutral  
The catalytic converter gets very hot during opera-  
tion. The heat remains for a long time after the en-  
gine has been stopped. Be aware of fire risk.  
4b. President-Royal-Pro16-Pro18-Pro20:  
Do not keep your foot on the drive pedal.  
Do not park in close proximity to in-  
flammable objects. Do not cover the  
machine until the catalytic converter  
has cooled down.  
5a. Senator-President:  
Starting cold engine – put the throttle control in the  
choke position. Starting warm engine – put the  
throttle control at full throttle (approx. 1 cm behind  
the choke position).  
STEERING AID (Pro20)  
Built-in function in order to facilitate steering. The  
operator only has to turn the steering wheel gently.  
An hydraulic torque amplifier creates the remain-  
ing force.  
5b. Royal-Pro16-Pro18-Pro20:  
Put the throttle control at full throttle. Starting cold  
engine – pull the choke control out fully. Starting  
warm engine – do not touch the choke control.  
As opposed to a normal servo steering (e.g. in a  
car), the steering aid has a limited capacity. This  
means that it has some characteristics that might be  
considered negative:  
- at a low engine rpm or in situations where extra  
steering force is needed, steering can be consid-  
ered to be “jumpy”.  
6. Depress the brake pedal fully.  
7. Turn the starter key and start the engine.  
8a. Senator-President:  
Once the engine has started, move the throttle con-  
trol gradually to full throttle if the choke has been  
used.  
- the machine should always be moving when the  
steering is used. Avoid turning the steering  
8b. Royal-Pro16-Pro18-Pro20:  
Once the engine has started, push the choke control  
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wheel when the machine stands completely still  
and the accessory is in the lowered working po-  
sition.  
work is performed by trained personnel and with  
original spare parts.  
At every service, the service log should be  
stamped. A “fully stamped” service log is a valua-  
ble document that improves the machine’s second-  
hand value.  
The steering is adapted in order to produce better  
results at a normal working speed.  
Even when the engine is not running, the steering  
works. However, it is harder to turn in this case, if  
the machine is to be manoeuvred manually.  
PREPARATIONS  
Unless otherwise stated, all service and mainte-  
nance must be performed on a machine that is  
standing still where the engine is not running.  
OPERATING  
Make sure that there is the correct quantity of oil in  
the engine when driving on slopes (oil level on  
“FULL”).  
Prevent the machine from rolling, by al-  
ways applying the parking brake.  
Be careful when driving on slopes. No  
sudden starting or stopping when mov-  
ing up or down a slope. Never drive  
across a slope. Move from the top and  
down, and from down to the top.  
Prevent involuntary engine start by al-  
ways stopping the engine, loosening the  
spark plug cable from the sparking  
plug and earthing it. Remove the minus  
(-) cable from the battery.  
The machine, equipped with original  
accessories must not be driven on slopes  
greater than 10º in any direction.  
CLEANING  
To reduce the risk of fire, keep the en-  
gine silencer/catalytic converter, bat-  
tery and fuel tank free from grass,  
leaves and oil.  
Reduce the speed on slopes and when  
moving the machine in sharp turns to  
prevent the machine from tipping over  
or that you lose control over the ma-  
chine.  
To reduce the risk of fire, regularly  
check the machine for oil and/or fuel  
leakage.  
Do not turn the steering wheel to full  
lock when driving in top gear and at full  
throttle, as the machine can easily top-  
ple over.  
When washing the machine with water under high  
pressure, do not point the jet directly at the trans-  
mission.  
Keep hands and feet well away from ar-  
ticulated steering joint and seat bracket  
to avoid having them squeezed. Never  
operate the machine without the engine  
casing.  
Do not point jets of water directly at the engine,  
use a brush or compressed air in order to clean it.  
CHANGING ENGINE OIL  
Change the oil for the first time after 8 hours run-  
ning (Senator and President after 5 hours), and  
then after every 50 hours running or once a year.  
Change oil when the engine is warm.  
SERVICE AND MAINTENANCE  
SERVICE PROGRAM  
Always use a good grade of oil (service grade SF,  
SG or SH).  
In order to keep the machine in good condition, as  
regards reliability and operational safety as well as  
from an environmental perspective, STIGA’s serv-  
ice program should be followed.  
Change the oil more often (after 25 hours of run-  
ning or at least once a season) if the engine has to  
operate under demanding conditions or if the am-  
bient temperature is high.  
The contents of this program can be found in the  
attached service log.  
We recommend that an authorised workshop car-  
ries out every service. This guarantees that the  
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The engine oil may be very warm if it is  
AIR FILTER - ENGINE  
drained off directly after the engine is  
shut off. Therefore, allow the engine to  
cool a few minutes before draining the  
oil.  
Clean the foam pre-filter every 3 months or after  
every 25 hours of operation, whichever comes  
first.  
Clean the paper filter insert once a year or after  
every 100 hours of operation, whichever comes  
first.  
1. Oil drain pipe (metal):  
Unscrew the oil drain plug at the end of the pipe.  
Let the oil run out into a collection vessel. Then  
take the oil to a recycling station. Do not allow  
oil to get on the V-belts.  
NOTE! The filters should be cleaned more often if  
the machine operates on dusty ground.  
1. Loosen the wing nut under the fuel tank and  
move it backwards (fig. 16). Also loosen the bat-  
tery to make it easier to get at the air filter (applies  
to Pro16-Pro18-Pro20).  
2. Screw up the oil drain plug. Make sure that the  
fibre gasket and the O-ring inside the plug are not  
damaged and that they are in the correct place.  
3. Remove the dipstick and fill up with new oil.  
2. Remove the protective cover of the air filter (fig.  
19 - 21).  
Oil capacity:  
Senator, President – 1.4 l  
Royal – 1.9 l (including oil filter)  
Pro16, Pro18, Pro20 - 1.7 l (including oil filter)  
3. Dismantle the paper filter insert and the foam  
pre-filter. Make sure that no dirt gets into the car-  
burettor. Clean the air filter housing.  
Oil type summertime (> 4º C): SAE-30  
(SAE 10W-30 can also be used. However, oil con-  
sumption may increase somewhat if 10W/30 is  
used. Therefore, check the oil level more regularly  
if you use this type of oil).  
4. Wash the pre-filter in liquid detergent and water.  
Squeeze dry. Pour a little oil on the filter and  
squeeze in the oil.  
5. Clean the paper filter insert as follows: Knock it  
lightly against a flat surface. If the filter is very  
dirty, change it.  
Oil type winter (< 4º C): SAE 5W-30  
(if this oil is not available, use SAE 10W-30).  
6. Assemble in the reverse order.  
Use oil without any additives.  
Petroleum-based solvents such as kerosene must  
not be used for cleaning the paper filter insert as  
these can destroy the filter.  
Do not fill too much oil as this can result in over-  
heating the engine.  
After filling up the oil, start the engine and idle for  
30 seconds. Stop the engine. Wait for 30 seconds  
and then check the oil level.  
Do not use compressed air for cleaning the paper  
filter insert. The paper filter insert must not be  
oiled.  
Check to see if there is any oil leakage. If neces-  
sary, fill up the oil up to the “FULL” mark.  
AIR FILTER - CATALYTIC CONVERT-  
ER (Pro18 - Pro20)  
OIL FILTER - ENGINE (Royal - Pro16  
- Pro18 - Pro20)  
Clean the catalytic converter’s air filter every 3  
months or after every 25 hours of operation,  
whichever comes first.  
Replace the oil filter after every 100 hours of oper-  
ation or once a season.  
1. Remove the cover by pressing in the locking  
mechanism with a screwdriver, etc. (fig. 22).  
Before screwing the new filter, oil the filter gasket  
with engine oil.  
2. Remove the foam filter and wash it in liquid de-  
tergent and water. Squeeze dry. Pour a little oil on  
the filter and squeeze in the oil.  
Screw the filter by hand, until the filter gasket  
touches the filter attachment. Then tighten ½ to ¾  
of a full turn (fig. 17 - 18).  
3. Replace the filter and snap the lock into place.  
SPARKING PLUG  
Start the engine and idle to see if any leakage oc-  
curs. Switch off the engine, check the oil level. If  
necessary, fill up the oil up to the “FULL” mark.  
Only use a Briggs & Stratton sparking tester to  
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check the spark of the sparking plug(s) (fig. 23).  
Senator-President-Royal:  
Lubricate the steering cables and steering chain  
with universal grease a couple of times per season.  
Clean the sparking plug after every 100 hours of  
operation or once a season. For replacing a spark-  
ing plug, a sparking plug sleeve A and a torsion pin  
B are provided in the accessories bag.  
Pro16-Pro18-Pro20:  
Apply universal grease to the steering chain a cou-  
ple of times each season. If the steering chains are  
really dirty, dismantle them, wash them and then  
grease them once more.  
The engine manufacturer recommends:  
Senator-President: Champion J19LM  
Royal-Pro16-Pro18-Pro20: Champion RC12YC  
Apply universal grease to all the plastic bearings a  
couple of times per season.  
The correct distance between the electrodes is 0.75  
mm.  
Apply a coating of engine oil to the tension arm  
joints a couple of times each season.  
COOLING AIR INTAKE - ENGINE  
Apply a few drops of engine oil to both ends of the  
throttle control cable a couple of times a season.  
The engine is air-cooled. A blocked cooling sys-  
tem can damage the engine. The engine should be  
cleaned at least once a year or every 100 hours of  
operation.  
Senator:  
The transmission is filled with oil (SAE 80W-90)  
upon delivery from the factory. If it is not opened  
(which must only be done by a specialist), normal-  
ly no topping up of oil should be carried out.  
Remove the fan casing. Clean the cooling fins on  
the cylinder, the fan and the rotating protective  
grille (fig. 24 - 25). Clean more frequently if mow-  
ing dry grass.  
STEERING CABLES (Senator -  
President - Royal)  
BATTERY  
The steering cables should be adjusted for the first  
time after the machine has been in operation for 2  
- 3 hours, and then after every 25 hours of opera-  
tion.  
Check the acid level regularly.  
The acid level should be between “UPPER “ and  
“LOWER” on the battery. When adjusting the lev-  
el, only use distilled water (battery water).  
Put the machine in the straight-ahead position.  
The battery acid is extremely corrosive  
and can cause burns and injuries to  
skin and clothing. Always use rubber  
gloves and glasses (goggles) to protect  
the eyes. Avoid inhaling any acid va-  
pour.  
Tension the steering cables by tightening up the  
nuts that are located on the underside of the articu-  
lated steering joint (fig. 27). The screws in the ends  
of the cables should be held firmly during adjust-  
ment so that the cables are not twisted. Use an ad-  
justable wrench or similar for this purpose,  
inserting it in the key handles in the ends of the  
screws. Tension the cables until they are no longer  
slack.  
Do not incline the battery too much so  
that the battery acid can run out on to  
hands and clothing. If this should hap-  
pen, flush with lots of water.  
Adjust both the nuts the same amount to ensure  
that the alignment of the steering wheel is not  
changed.  
If the battery terminals are coated with oxide, they  
should be cleaned. Clean the battery terminals with  
a wire brush and grease them.  
Once the adjustment is complete, turn the steering  
wheel as far as it will go in either direction. Check  
that the chain does not come into contact with the  
pulley, and that the cables do not become entan-  
gled with the steering pinions.  
LUBRICATION - CHASSIS  
The machine’s articulated steering joint has four  
grease nipples that should be lubricated with uni-  
versal grease after every 25 hours of operation  
(fig. 26).  
Do not tension the steering cables too hard. Other-  
wise the steering will be heavy and wear and tear  
on the cables will increase.  
Please note that the fourth grease nipple is not  
shown on the picture. It is located on the underside,  
on the flexible axle’s front bearing.  
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STEERING CHAINS (Pro16 - Pro18 -  
Pro20)  
Adjust the steering chains after every 50 hours of  
operation.  
Put the machine in the straight-ahead position.  
Tension the steering chains by tightening up the  
nuts that are located on the underside of the articu-  
lated steering joint (fig. 27). Tension until all play  
is removed.  
Adjust both the nuts the same amount to ensure  
that the alignment of the steering wheel is not  
changed.  
Do not over-tighten the steering chain. This will  
cause the steering to become heavy and will in-  
crease wear on the steering chain.  
PATENT –  
PROTECTION OF DESIGNS  
This machine, or parts thereof, is protected by the  
following patent and protection of design:  
9900627-2 (SE), SE00/00250 (PCT), 9901091-0  
(SE), SE00/00577 (PCT), 9901730-3 (SE), SE00/  
00895 (PCT), 9401745-6 (SE), SE95/00525  
(PCT), 595 7497 (US), 95920332.4 (EPC).  
99 1095 (SE), 499 11 740.9 (DE), M1990 000734  
(IT), 577 251-253 (FR), 115325 (US).  
STIGA reserves the right to modify the product without giv-  
ing any prior notice.  
17  
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