T
ECHNICAL INFORMATION
Models No.
UC3003A, UC3503A, UC4003A, UC4503A
PRODUCT
P 1 / 8
Description
Chain saws 300mm, 350mm, 400mm, 450mm
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.
Additionally, the new series includes Model UC4503A,
450mm (18") chain saw which is not in the lineup of UC3001A
series.
Specification
Voltage (V)
230 - 240
Current (A)
8.8 2,000 2,2001,100
Cycle (Hz)
50 / 60
L
Length ( L )
Width ( W )
Height ( H )
Continuous Rating (W)
Input Output
W
H
Dimensions: mm ( " )
470 (18-1/2)
179 (7)
215 (8-1/2)
Max. Output (W)
Model No.
Chain type
Chain blade
No load chain speed: m/s
Guide bar length: mm (")
Electric brake
Clutch
Pitch
Gauge
UC3003A UC3503A UC4503AUC4003A
91VG
3/8" 46 drive links
300
(12)
3/8" 52 drive links 3/8" 56 drive links 3/8" 62 drive links
0.050"
13.3
350
(14)
Yes
Yes
400
(16)
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
450
(18)
Repair
CAUTION:
First of all, remove the chain blade for your safe repair and maintenance.
< 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)
Fig. 1
Gear housing L
(35)
Gear housing R
P 2 / 8
Straight
bevel gear 14
Item No.
(31)
(35) Straight bevel gear 43 Whole part approx. 3.0
Part Name
Worm gear Whole part approx. 1.0
(31)
Portion to be lubricated
Amount: g
< 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)
Fig. 2
Cover (for switch)
Carbon brush
Tapping screw 4x18
Brush holder cap
(to be continued to next page)
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
Switch
Gear housing L
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
Motor housing
Connecting terminal
Armature
Straight
bevel gear 14
Tapping screw 5x25 (4 pcs)
Bearing extractor
(No.1R269)
Gear housing section
Ball bearing 629ZZ
Motor housing
< 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
(to be continued to next page)
Cover plate
Tapping screw
BT3.5x9.5
Repair
< 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.
Fig. 7
Tubular handle
P 4 / 8
Fig. 6
Tubular handle
Tapping
screw 5x25
Tapping
screw 5x55
Oil tank
Gear housing L
Gear housing L
Gear housing R
< 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
Ball Bearing 608ZZ
Bearing extractor
(No.1R269)
Safety washer
(to be continued to next page)
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
P 5 / 8
Clutch drum is locked
with brake spring.
Gear housing R
Retaining ring R
Brake spring
Clutch drum
2. By removing Safety ring and Flat washer 8, Clutch drum can be removed from Gear housing R. (Fig. 11)
Fig. 11
Gear housing R
Clutch drum
Brake spring
pliers (No.1R005)
Brake spring
holder
Clutch drum is released
from brake spring.
Safety ring
Flat washer 8
Washer
Pressure spring
Clutch drum
Claw coupling
(to be continued to next page)
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
P 6 / 8
[A]
Brake spring
Brake spring
Claw of brake
spring holder
< 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
Retaining ring S pliers
(No.1R003)
Compression spring 9
Retaining ring R pliers
(No.1R005)
Clutch drum
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)
Brake spring
Clamp washer
Brake spring holder
(to be continued to next page)
Circuit diagram
Fig. 16
Power supply
cord
Noise
suppressor
Color index of lead wire sheath
Black
White
Yellow
Orange
P 7 / 8
Field
12453
Main switch
Receptacle sleeve
Brake switch
COM
NO
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)
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)
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.
Screw
M5x55
Lead wire holders
Receptacle
(to be continued to next page)
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
P 8 / 8
Main switch
Noise suppressor
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
Lead wire (black) from
Switch installed on
Gear housing (L)
Field lead
wire (orange)
Field lead
wire (yellow)
Noise suppressor
Handle (L)
Main switch
Put the loose portion of
lead wires into this pace.
[end of repair manual]
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