Makita UC3020A Manual

Model No.

Description

PRODUCT

CONCEPT AND MAIN APPLICATIONS

P 1 /10

Specification

Standard equipment

*Dimensions: mm (")

*Dimensions: excludes guide bar.

Width (W)

Height (H)

Length (L) 436

244

200

Note: The standard equipment for the tool shown above may differ by country.

UC3020A/ UC3520A/ UC4020A

Chain Saws 300mm (12")/ 350mm (14")/ 400mm (16")

Chain blade Pitch

Chain brake Mechanical brake

Chain oil tank capacity: ml

Chain speed per sec: m/s (m/min)

Standard guide bar: mm (")

Automatic chain oiling

Double insulation

Net weight: kg (lbs)

Power supply cord: m (ft)

Model No. UC3020A UC3520A UC4020A

13.3 (800)

0.3 (0.98)

3.8

(excluding guide bar and chain blade)

3/8"

200

Yes

400

(16)

300

(12)

350

(14)

Type 90SG-52E 90SG-56E90SG-46E

Chain blade ........................ 1 pc (UC3020A: 90SG-46E, UC3520A: 90SG-52E, UC4020A: 90SG-56E)

Guide bar ........................... 1 pc (UC3020A: 90SG 12", UC3520A: 90SG 14", UC4020A: 90SG 16")

Ghain cover ....................... 1 pc

Hook complete .................. 1 pc

These new electric chain saws have been developed as the

up-graded successors to the current UC3010A series models.

Designed with the concept of "Easy Operation and Maintenance",

and feature the following main advantages;

Toolless blade change and adjustment

Front grip ergonomically designed for high maneuverability

TECHNICAL INFORMATION

Continuous Rating (W)

Voltage (V) Cycle (Hz) Input Output Max. Output (W)

120

110 15 1,570

1,710

700 1,90050/ 60

8.6 1,800 1,000 2,40050/ 60

8.2 1,800 1,000 2,40050/ 60

7.9 1,800 1,000 2,40050/ 60

15 850 1,95050/ 60

220

230

240

Current (A)

Optional accessories

Chain blade (90SG, 91VG) (300/ 350/ 400mm)

Guide bar (90SG, 91VG) (300/ 350/ 400mm)

Chain oil

P 2 /10

Repair

[2] LUBRICATION

As illustrated in Fig. 1, to protect parts and product from unusual abrasion;

1) Apply Makita grease N. No.2 to the portions designated with the black triangle.

2) When replacing Oil pump complete, apply a little amount of Chain oil to the portions designated with the gray triangle.

[3] DISASSEMBLY/ASSEMBLY

[3] -1. Lubricating Mechanism

Fig. 2

[1] NECESSARY REPAIRING TOOLS

CAUTION: Remove the chain blade, guide bar from the machine for safety before

repair/ maintenance ! Take off chain oil from oil tank !

1) Put the machine on a work bench as illustrated in Fig. 2, then separate Housing (R) from Housing (L) by removing

nine 4x18 Tapping screws.

Note: Housing (R) can be separated without removing Sprocket.

Important: Do not remove Oil tank cap in this step.

2) The parts marked with * and ** can now be replaced. (Fig. 2)

The parts marked with ** are components of lubricating mechanism.

DISASSEMBLING

*Brake switch

*O Ring 6 *Crank

O Ring 6 may be

removed together

with Housing (R)

in this step.

*Main switch *Power supply cord

Tapping screw

4x18 (9 pcs)

**Oil pump complete

Sprocket

**Oil tank

**Oil tube

**Oil tank cap

Housing (L)

Housing (R)

1R269 Bearing Extractor Removing ball bearings

DescriptionCode No. Use for

Bearing Box

Cam

Crank

Gear room (Apply about 3g.)

The portion that contacts 56 Crank

Pin portion that reciprocates in Oil pump complete

Spur gear 43

Oil pump complete

Fig. 1

Item No. Description Portion to lubricate

P 3 /10

Repair

[3] DISASSEMBLY/ASSEMBLY

[3] -1. Lubricating Mechanism (cont.)

Fig. 4 Fig. 5

Fig. 6

Fig. 3

ASSEMBLING

1) Mount O ring 6 to the boss of Bearing holder. (Fig. 3)

2) See Fig. 4.

Before connecting Oil tube to Oil tank, make sure that:

1. Packing is mounted between Oil tank cap and Oil tank.

2. O ring 6 is mounted to Oil pump complete.

3. Clamp is put through Oil tube.

4. Cap and Spring are assembled to in Oil tube.

3) Push Oil tube into Oil tank deeply until it stops, and secure

with Clamp.

Note: Make sure that the tabs of Clamp is positioned on the

Housing (R) installation side as illustrated in Fig. 5.

Then connect the other end of Oil tube securely to Oil pump

complete.

4) Assemble the lubricating mechanism to the machine. (Fig. 6)

5) See Figs. 21 and 22 on page 10 for assembling of electrical

parts.

Oil tank cap

Packing

Oil tank

Cap

Spring

Oil tube

Oil pump complete O Ring 6

Clamp

tabs of Clamp

O Ring 6

Bearing holder

boss on Housing (L)

Route Oil tube as illustrated below.

Oil tube

pin of Crank

Oil pump complete

Crank

Housing (R)

installation side

Housing (L) side

boss

Oil tank

Oil tube

[A]

View from [A]

Insert pin of Crank into Oil pump complete.

boss on Housing (L)Oil tubeClamp

Oil pump complete

P 4 /10

Repair

[3] DISASSEMBLY/ASSEMBLY

[3] -1. Lubricating Mechanism (cont.)

Fig. 7

If the oil is not supplied to chain or delivered very little;

1) Remove Guide bar, then Push nut and Filter. (Fig. 7) Run the machine without Filter.

If the oil flows out from Oil supply port, there is not trouble with Oil pump complete.

The malfunction is caused by clogged Filter in this case. Clean up Filter with kerosene.

2) If the oil does not flow out, remove Housing (R) (Fig.2on page 2) and disassemble Lubricating mechanism

(Fig.3on page 3), and check whether the following parts are clogged with foreign matter:

Filter in Oil tank, Oil tube, Oil pump complete

If clogged, remove foreign matter and clean up the part(s) with kerosene.

Reassemble Lubricating mechanism and Housing (R) to Housing (L), then Filter and Push nut to Housing (R).

Run the machine, then check whether the oil flows out.

3) If the oil does not flow out, the malfunction is caused by broken Oil pump complete.

Replace Oil pump complete with new one.

TROUBLE SHOOTING

Filter

Housing (R)

Important:

Removed Push nut can be reused.

However, replace with new one

if any one of the teeth is broken

or badly deformed.

Push nut

Oil supply port

P 5 /10

Repair

Fig. M-1

Fig. M-2 Fig. M-3

Fig. M-4

Refer to the explanation below when repairing Brake mechanism.

These models are equipped with the following two brake systems.

A. Brake Synchronized with Switch Lever

This brake works when Switch lever is released to stop operation. (Figs. M-1, M-2, M-3)

B. Kick Back Brake

This brake works when Front hand guard is pushed towards Chain bar. The machine stops even if Switch lever stays

in ON position. (Fig. M-4)

Principle of Brake Mechanism

[3] DISASSEMBLY/ASSEMBLY

[3] -2. Brake Mechanism and Armature

When Switch Lever is Pulled

Kick Back Brake

When Switch Lever is Released

Brake band is also pulled to unlock the drum portion

of Armature, and Armature starts rotating.

1) When Front hand guard is pushed towards Chain bar, Link plate complete is bent by the projection on the guard.

2) Brake band is pulled by the bent Link plate complete. (The tension force of Compression spring 9 keeps Link plate

complete bent.)

3) The drum portion of Armature is locked by Brake band to stop the rotation of Armature.

Brake band returns to the initial position to lock

the drum portion of Armature, and Armature immediately

stops rotating.

Link plate complete Brake band

Switch Lever

drum portion

of Armature

Compression spring 9

projection on

Front hand guard

projection on

Front hand guard

Link plate complete

Compression spring 9

Brake band

Switch lever

Rod

Before Pulling Switch Lever

Switch lever

in ON position

drum portion

of Armature

drum portion of Armature

Brake mechanism viewed from the Housing (R) side

P 6 /10

Repair

[3] DISASSEMBLY/ASSEMBLY

[3] -2. Brake Mechanism and Armature

Fig. 11

DISASSEMBLING

Link plate

complete

Bearing holder

1) Remove Housing (R). (Fig.2on page 2)

2) Push Front hand guard towards the Guide bar installation side to lock Armature with kick back brake.

If Front hand guard is damaged, remove it and lock Armature by bending Link plate complete with a slotted

screwdriver. (Fig. 8)

3) Remove entire Lubricating mechanism (Oil pump complete, Oil tube, Oil tank). While swiveling Switch lever,

disconnect from Rod. Unscrew four 4x18 Tapping screws. (Fig. 9)

4) Put the machine as illustrated in Fig. 10. Remove Rear cover, then Carbon brush. The assembly of Armature and

Bearing holder can now be removed.

5) By hooking Rod on the notch of Bearing holder as illustrated in Fig. 11, place Rod in the same position as it would be

when Switch lever is pulled. Brake synchronized with Switch lever is now unlocked.

Housing (L)

Fig. 8 Fig. 9

Fig. 10

Armature

Bearing holder

Carbon brush

Rear cover

Tapping screw 4x18

Tapping screw

4x18 (4 pcs)

Oil tank

Switch lever

Rod

Oil tube

Oil pump complete

Push Link plate complete strong

using a slotted screwdriver.

Pull Rod in the direction of the arrow

and hook its bent portion on the notch

of Bearing holder.

notch of Bearing holder

Rod

P 7 /10

Repair

[3] DISASSEMBLY/ASSEMBLY

[3] -2. Brake Mechanism and Armature (cont.)

Fig. 12

Fig. 13

Fig. 15

DISASSEMBLING

6) Unlock the Kick back brake by pulling Link plate complete in the direction of the gray arrow with adjustable pliers.

(Fig. 12)

7) Armature can now be separated from Bearing holder as illustrated in Fig. 13.

8) Remove the tension force of Compression spring 9 from Link plate complete by pulling Link plate complete with

pliers in the direction of the gray arrow with adjustable pliers. (Fig. 14)

9) By removing Pin 5, Link plate complete and Compression spring 9 can be separated from Bearing holder. (Fig. 15)

Link plate complete

drum portion of Armature

Bearing Holder viewed form Armature Side

Hex nut M8

Spur gear 12

Bearing holder

Armature

Fig. 14

Link plate complete Compression spring 9

Brake band

Tapping screw 4x18,

securing Brake band

Brake ring

Link plate complete moves

in the direction of the black arrow.

Link plate complete moves

in the direction of the black arrow.

Brake band is loosened to unlock

the drum portion of Armature.

Brake band

Pin 5

P 8 /10

Repair

[3] DISASSEMBLY/ASSEMBLY

DISASSEMBLING

[3] -2. Brake Mechanism and Armature (cont.)

10) Remove Brake band by unscrewing Tapping screw 4x18, then disconnect Brake ring from Rod. (Fig. 16)

11) Remove Rod from Bearing holder. (Fig. 17)

Fig. 16 Fig. 17

Brake band

Bearing holder

Compression spring 5

Brake ring

Tapping screw 4x18

Flat washer 5

Rod

Take off rod from the slit by pulling in the direction

of Brake band installation side.

Rod

1) Assemble the components of Brake mechanism to

Bearing holder. (Figs. 17, 16, 15)

Note:

*Engage the notch on Brake band with the projection on

Brake ring when assembling Brake band to Bearing holder.

Otherwise Armature cannot be unlocked when Switch lever

is pulled for starting operation. (Fig. 18)

*Compression spring 9 of link plate complete has to be set

in the rib of bearing holder exactly. (Fig. 15 on page 7)

2) Unlock Kick back brake with pliers. (Fig. 12 on page 7)

3) Assemble Rod to Bearing holder as illustrated in Fig. 11 on page 6.

Kick back brake and brake synchronized with Switch lever are both unlocked in this step.

4) Assemble Armature to Bearing holder. (Fig. 13 on page 7)

5) Assemble Lubricating mechanism to Bearing holder. (Figs. 6, 5, 4, 3on page 3)

6) Pull Switch lever to loosen Brake band.

7) Engage Spur gear 43 mounted to Housing (R) with Spur gear 12 mounted to Armature.

Then turn Sprocket until Cam of Spindle fits in the loop portion of Crank.

8) Secure Housing (R) to Housing (L) with nine 4x18 Tapping screws. (Fig. 2 on page 3)

ASSEMBLING

Fig. 18

notch

projection

Brake band

Brake ring

Rod

Circuit diagram

P 9 /10

Black

White

Orange

Color index of lead wires' sheath

Brake switch

Front Grip SideRear Grip Side

Main Switch

Power SupplyCord

Field

Noise

suppressor

Rear Grip

Motor Housing

Front Grip

Fig. 19

Wiring diagram

P 10 /10

Fig. 20

(to main switch)

Field

Brake switch

A. Field Lead Wire (black)

Connecting lead wire (orange)

B. Field Lead Wire (white)

Lead wire holder

Lead Wire Holder

Rib F

Rib G

Rib D

Rib E

Rib C

Rib B

Rib A

Wall of

housing set (L) Recectaples

Top View of Bake Switch

The recectaples have to face the wall of

housing set (L).

A. Field Lead Wire (black) to Brake Switch

Route it between rib A and rib B.

B. Field Lead Wire (white) to main switch

Route it between rib C and rib D.

Route these lead wires between rib F and rib G, and then

put them into lead wire holders.

Motor Section

Handle Section

Main Switch

Noise Suppressor

Strain Relief

to Field

Power Supply Cord

Put noise suppressor into the space

between strain relief and main switch.

to Brake switch

Fig. 21

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