Makita UC3003A Manual

Continuous Rating (W)
Voltage (V)
Model No.
Chain blade
No load chain speed: m/s
Electric brake
Guide bar length: mm (")
Pitch
Chain type
Gauge
Cycle (Hz)
UC3003A UC3503A UC4503AUC4003A
UC3003A, UC3503A, UC4003A, UC4503A
Chain saws 300mm, 350mm, 400mm, 450mm
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.
Additionally, the new series includes Model UC4503A,
450mm (18") chain saw which is not in the lineup of UC3001A
series.
Input Output Max. Output (W)
230 - 240
Models No.
Description
PRODUCT
Current (A)
TECHNICAL INFORMATION
CONCEPT AND MAIN APPLICATIONS
Specification
Standard equipment
Optional accessories
< Note > The standard equipment for the tool shown may differ from country to country.
* Chain blade
* Guide bar
P 1 / 8
Dimensions: mm ( " )
Width ( W )
Height ( H )
Length ( L )
50 / 60
W
L
H
470 (18-1/2)
215 (8-1/2)
179 (7)
8.8 2,000 2,2001,100
Clutch
3/8" 46 drive links
91VG
3/8" 52 drive links 3/8" 56 drive links 3/8" 62 drive links
0.050"
300
(12)
350
(14)
400
(16)
450
(18)
Yes
13.3
Yes
* Guide bar scabbard .................... 1 pc.
* Wrench ....................................... 1 pc.

Repair
P 2 / 8
< 1 > Lubrication
Apply Makita grease N. No.1 to the following portions designated by black triangle
to protect parts and product from unusual abrasion. (Fig. 1)
< 2 > Removing Gear Housing from Motor Housing for Replacement of Armature Assembly
1. After removing brush holder caps, remove carbon brushes.
Remove a 4x18 tapping screw. Now cover (for switch) can be removed from gear housing L. (Fig. 2)
(to be continued to next page)
Gear housing L
Gear housing R
Straight
bevel gear 14
(35)
(31)
(31)
Item No. Part Name Amount: g
Portion to be lubricated
Worm gear Whole part approx. 1.0
(35) Straight bevel gear 43 Whole part approx. 3.0
CAUTION:
First of all, remove the chain blade for your safe repair and maintenance.
Fig. 1
Fig. 2
Brush holder cap
Carbon brush
Tapping screw 4x18
Cover (for switch)

Repair
P 3 / 8
< 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.
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. 3
< 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.
(to be continued to next page)
Fig. 5
Fig. 4
Switch Connecting terminal
Tapping screw 5x25 (4 pcs)
Motor housing
Motor housing
Gear housing section
Straight
bevel gear 14
Armature
Ball bearing 629ZZ
Bearing extractor
(No.1R269)
Gear housing L
Oil tank cap
Tapping screw
BT3.5x9.5
Cover plate
Gasket

Repair
P 4 / 8
< 3 > Disassembling Gear Housing (cont.)
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.
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.
< 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.
(to be continued to next page)
Fig. 6
Fig. 7
Fig. 8
Tapping
screw 5x55
Tapping
screw 5x25
Gear housing L
Tubular handle
Tubular handle
Gear housing R
Gear housing L
Oil tank
Straight bevel gear 43
Bearing extractor
(No.1R269)
Ball Bearing 608ZZ
Safety washer
A
[Gear housing viewed from the position A]

Repair
P 5 / 8
< 4 > Replacement of Straight Bevel Gear 43 and Oil Pump Complete (cont.)
< 5 > Replacement of Clutch Drum and Brake Spring
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.
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.
2. By removing Safety ring and Flat washer 8, Clutch drum can be removed from Gear housing R. (Fig. 11)
Fig. 9
Fig. 10
Fig. 11
Tapping screw BT3.5x9.5
Holder
Oil pump complete
Worm gear
Brake spring
holder
Brake spring
Gear housing R
Retaining ring R
pliers (No.1R005)
Clutch drum is locked
with brake spring.
Clutch drum is released
from brake spring.
Clutch drum
Safety ring
Flat washer 8
Washer
Pressure spring
Clutch drum
Claw coupling
Gear housing R
Brake spring
Clutch drum
(to be continued to next page)

Repair
P 6 / 8
< 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)
< 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. 12
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
Fig. 13 Fig. 14
Brake spring
Gear housing (R)
Brake spring
holder
Brake spring holder
Brake spring
Claw of brake
spring holder
Gear housing (R)
Brake spring holder
Clutch drum Brake spring
Retaining ring S pliers
(No.1R003)
Retaining ring R pliers
(No.1R005)
[A]
Enlarged image of [A]
Clamp washer
Brake spring holder
Gear housing (R)
Compression spring 9
(to be continued to next page)

Circuit diagram
Wiring diagram- (1) Outside and Inside Motor Housing
P 7 / 8
Fig. 16
Fig. 17
Fig. 18
Color index of lead wire sheath
Black
White
Orange
Yellow
COM
Receptacle sleeve
NO
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.
12
45
3
Main switch
Power supply
cord
Field
Field lead wire
(orange)
Field lead wire
(yellow)
Field lead wire
(black)
Fix Field lead wire
(yellow) with lead
wire holder.
Screw
M5x55
Receptacle
Lead wire holders
Adjust the length of
Field lead wire (black)
so that the Receptacle
comes to the position
of M5x55 screw.
Noise
suppressor
Brake switch
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)
(to be continued to next page)

Wiring diagram- (2) Inside Handle (L)
P 8 / 8
Fig. 19
Fig. 20
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)
2. After installation of Main switch, put the loose portion of the Lead wires into the space illustrated in Fig. 20.
Main switch
Main switch
Lead wire holders
Field lead
wire (orange)
Field lead
wire (yellow)
Lead wire (black) from
Switch installed on
Gear housing (L)
Noise suppressor
Noise suppressor
Put the loose portion of
lead wires into this pace.
Handle (L)
Handle (L)
[end of repair manual]