ECHNICAL INFORMATION
PRODUCT
P 1 / 8
T
Models No.
Description
UC3003A, UC3503A, UC4003A, UC4503A
Chain saws 300mm, 350mm, 400mm, 450mm
W
CONCEPT AND MAIN APPLICATIONS
For European market, the above models have been developed
as upgraded chain saws of the current UC3001A series models.
The new UC3003A seies models feature contnuous rating input
of 2000W while the UC3001A series 1800W.
L
Additionally, the new series includes Model UC4503A,
450mm (18") chain saw which is not in the lineup of UC3001A
series.
H
Dimensions: mm ( " )
Length ( L ) 470 (18-1/2)
Width ( W )
Height ( H )
179 (7)
215 (8-1/2)
Specification
Continuous Rating (W)
Voltage (V)
230 - 240
Cycle (Hz)
50 / 60
Max. Output (W)
2,200
Current (A)
8.8
Input
Output
2,000
1,100
Model No.
UC3003A
UC3503A
UC4003A
UC4503A
Chain type
91VG
Pitch
Chain blade
3/8" 46 drive links 3/8" 52 drive links 3/8" 56 drive links 3/8" 62 drive links
Gauge
0.050"
13.3
No load chain speed: m/s
300
(12)
350
(14)
400
(16)
450
(18)
Guide bar length: mm (")
Electric brake
Clutch
Yes
Yes
Standard equipment
* Guide bar scabbard .................... 1 pc.
* Wrench ....................................... 1 pc.
< Note > The standard equipment for the tool shown may differ from country to country.
Optional accessories
* Chain blade
* Guide bar
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P 3 / 8
Repair
< 2 > Removing Gear Housing from Motor Housing for Replacement of Armature Assembly (cont.)
2. Take switch out of gear housing L, and then disconnect the connecting terminal from switch
as illustrated to left in Fig. 3.
3. Remove four 5x25 tapping screws as illustrated to right in Fig. 3.
Now motor housing can be separated from gear housing section.
Fig. 3
Connecting terminal
Gear housing section
Motor housing
Switch
Gear housing L
Tapping screw 5x25 (4 pcs)
4. Replace armature assembly as described below (Fig. 4):
1) After removing motor housing from gear housing, take armature assembly out of motor housing.
2) Remove straight bevel gear 14 from the armature. This gear can be removed by hand.
3) Remove ball bearing 629ZZ on the commutator end of armature assembly using Bearing extractor (No.1R269)
and pliers as illustrated to right in Fig. 4.
Ball bearing 6301LLB on the drive end of armature assembly can be removed in the same way.
Fig. 4
Ball bearing 629ZZ
Motor housing
Straight
bevel gear 14
Armature
Bearing extractor
(No.1R269)
< 3 > Disassembling Gear Housing
1. Remove oil tank cap, and remove chain oil from oil tank as illustrated to left in Fig. 5.
2. Separate cover plate from gear housing R by removing four BT3.5x9.5 tapping screws as illustrated to right
in Fig. 5.
Fig. 5
Gasket
Oil tank cap
Cover plate
Tapping screw
BT3.5x9.5
(to be continued to next page)
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P 4 / 8
Repair
< 3 > Disassembling Gear Housing (cont.)
Fig. 6
3. Remove four 5x25 tapping screws and two 5x55 tapping
screws as illustrated in Fig. 6.
Removal of the screws will release tubular handle from gear
housing.
Tubular handle
4. Remove tubular handle from the bottom side of gear housing L
as illustrated to left in Fig. 7.
5. Remove gear housing R from gear housing L as illustrated to
right in Fig. 7.
Tapping
screw 5x25
Tapping
screw 5x55
Fig. 7
Tubular handle
Oil tank
Gear housing L
Gear housing R
Gear housing L
< 4 > Replacement of Straight Bevel Gear 43 and Oil Pump Complete
1. Remove gear housing R from gear housing L as described in "<3> Disassembling Gear Housing". (Fig. 5, 6, 7)
2. Remove ball bearing 608ZZ using Bearing extractor (No.1R269) (Fig. 8)
3. Remove safety washer from spindle. And now straight bevel gear 43 can be removed from spindle. (Fig. 8)
Note: Before installing a brand-new straight bevel gear 43, be sure to apply 3g of Makita grease N No.1 to its
gear teeth.
Fig. 8
[Gear housing viewed from the position A]
A
Straight bevel gear 43
Safety washer
Ball Bearing 608ZZ
Bearing extractor
(No.1R269)
(to be continued to next page)
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P 5 / 8
Repair
< 4 > Replacement of Straight Bevel Gear 43 and Oil Pump Complete (cont.)
4. Remove Holder by removing BT3.5x9.5. Oil pump complete can now be removed from Gear housing (R). (Fig. 9)
Note: When installing new Oil pump complete, apply 1g of Makita grease N. No.1 to Worm gear.
Fig. 9
Holder
Tapping screw BT3.5x9.5
Oil pump complete
Worm gear
< 5 > Replacement of Clutch Drum and Brake Spring
1. First release Clutch drum from Brake spring using Retaining ring R pliers (No.1R005) as described below.
Insert one jaw of the pliers into the hole of Brake spring holder, and then put the other jaw on the edge of
Gear housing R as illustrated to left in Fig. 10.
Close the pliers until Brake spring holder is locked in the position as illustrated to right in in Fig. 10.
Now clutch drum is released from Brake spring.
Fig. 10
Clutch drum is locked
with brake spring.
Clutch drum is released
from brake spring.
Gear housing R
Brake spring
Retaining ring R
Gear housing R pliers (No.1R005)
Clutch drum
Clutch drum
Brake spring
Brake spring
holder
2. By removing Safety ring and Flat washer 8, Clutch drum can be removed from Gear housing R. (Fig. 11)
Fig. 11
Washer
Pressure spring
Clutch drum
Safety ring
Flat washer 8
Claw coupling
(to be continued to next page)
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P 6 / 8
Repair
< 5 > Replacement of Clutch Drum and Brake Spring (cont.)
3. Take Brake spring out of Gear housing (R), then remove Brake spring from the claw of Brake spring holder. (Fig. 12)
Fig. 12
Enlarged image of [A]
Gear housing (R)
Brake spring holder
Brake spring
holder
[A]
Brake spring
Claw of brake
spring holder
Brake spring
< 6 > Replacement of Brake Spring Holder
1. First lock Clutch drum with Brake spring using Retaining ring S pliers (1R003) as described below.
Place the jaws of the pliers as illustrated in Fig. 13.
Open the pliers until Brake spring holder is locked in the position as illustrated in Fig. 13.
Now clutch drum is locked with Brake spring.
2. Inert one jaw of Retaining ring R pliers (No.1R005) into the hole of Brake spring holder, and the other jaw into
Compression spring 9 as illustrated in Fig. 14.
By closing the pliers, Compression spring 9 can be removed from Gear housing (R).
Fig. 13
Fig. 14
Gear housing (R)
Brake spring holder
Compression spring 9
Retaining ring R pliers
(No.1R005)
Retaining ring S pliers
(No.1R003)
Clutch drum
Brake spring
3. By removing Clamp washer using a slotted screwdriver or the like, Blake spring holder can be replaced. (Fig. 15)
Note: Do not reuse a Clamp washer removed from Gear housing (R). Always use brand-new one.
Fig. 15
Gear housing (R)
Clamp washer
Brake spring holder
(to be continued to next page)
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P 7 / 8
Circuit diagram
Fig. 16
Color index of lead wire sheath
Black
White
Yellow
Orange
Noise
suppressor
Field
Power supply
cord
Receptacle sleeve
3 2 1
Brake switch
5 4
COM
NO
Main switch
Wiring diagram- (1) Outside and Inside Motor Housing
Pull the Field lead wires out of the commutator end of Motor housing as illustrated to left in Fig. 17.
Be sure to fix the Field lead wire (yellow) with lead wire holders as illustrated to right in Fig. 17.
Fig. 17
Field lead wire
(black)
Field lead wire
(orange)
Field lead wire
(yellow)
Fix Field lead wire
(yellow) with lead
wire holder.
Fig. 18
Adjust the length of Field lead wire
(black) so that the Receptacle comes
to the position of M5x55 screw, the
field screw.
Be sure to fix the lead wire with lead
wire holders. (Fig. 18)
Adjust the length of
Field lead wire (black)
so that the Receptacle
comes to the position
of M5x55 screw.
Screw
M5x55
Lead wire holders
Receptacle
(to be continued to next page)
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P 8 / 8
Wiring diagram- (2) Inside Handle (L)
1. Before installing Main switch onto Handle (L), fix the following lead wires
with lead wire holders as illustrated in Fig. 19.
* Field lead wire (orange)
* Field lead wire (yellow)
* Lead wire (black) from switch installed on Gear housing (L)
Fig. 19
Lead wire (black) from
Switch installed on
Gear housing (L)
Main switch
Field lead
wire (orange)
Noise suppressor
Field lead
wire (yellow)
Lead wire holders
Handle (L)
2. After installation of Main switch, put the loose portion of the Lead wires into the space illustrated in Fig. 20.
Fig. 20
Main switch
Noise suppressor
Put the loose portion of
lead wires into this pace.
Handle (L)
[end of repair manual]
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