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

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)

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

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

Gear housing R

Gear housing L

Oil tank

Straight bevel gear 43

Bearing extractor

(No.1R269)

Ball Bearing 608ZZ

Safety washer

[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

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.

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

Lead wire holders

Field lead

wire (orange)

Field lead

wire (yellow)

Lead wire (black) from

Switch installed on

Gear housing (L)

Noise suppressor

Put the loose portion of

lead wires into this pace.

Handle (L)

[end of repair manual]

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