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OFFICIAL USE 

for ASC & Sales Shop

Model No.

 Description

PRODUCT

C

ONCEPT AND MAIN APPLICATIONS

S

pecification

Continuous Rating (W)

Voltage (V)

Cycle (Hz)

Input

Output

Max. Output (W)

110

120

220

230

240

15

14.5

8.6

9.2

8.8

50-60

50-60

50-60

50-60

50-60

1,570

1,800

2,000

2,000

800

900

1,000

1,100

1,100

1,500

1,800

2,200

2,200

2,200

Current (A)

UC3050A, UC3550A, UC4050A, UC4550A

UC3051A, UC3551A, UC4051A, UC4551A
Chain saw

Dimensions

*

4

: mm (")

Illustration above is UC3051A.

Width (W)

Height (H)

Length (L)

The subject models are the successors of UCxx30A series

*

1

.

The chain oil pump is improved to realize more efficient oiling.

UCxx51A series

*

2

 have an improved toolless tension adjustment for easier 

handling. 

UCxx50A series

*

3

 have newly designed nut-fix style sprocket cover.

Other main features of the subject models are as follows;

 • Adjustable automatic chain oiling

 • Soft start for reducing start-up reaction

 • Current limiter protects motor from heat damage

 • Large separate-type metal spike bumper

S

tandard equipment

Saw chain

Pitch

Chain brake

Electric brake

Soft start

Yes

Torque limiter

Yes

Chain oil tank capacity: mL (US oz)

Chain speed per sec.:

m/s (m/min.)[ft/min.]

 length: mm (")
 Type

 Double guard

Automatic chain oiling
Protection from electric shock
Power supply cord: m (ft)

Model No.

UC3050A/ UC3051A  UC3550A/ UC3551A  UC4050A/ UC4051A   UC4550A/ UC4551A 

14.5 (870) [2,900]

UK: 10 (32.8)/ Germany, Sweden, Reunion, China, Taiwan, Vietnam: 5 (16.4)/

Singapore, India: 2.5 (8.2)/ Other countries: 0.3 (0.98)

5.6/ 5.6

(12.2/ 12.3)

5.5 (12.1)

5.4 (11.9)

5.7/ 5.7

(12.4/ 12.5)

3/8"

200 (6.8)

Yes

Double insulation

Max. cutting capacity: mm (")

Type

91PX-52E

91PX-62E

91PX-56E

91PX-46E

350 (14)

450 (18)

400 (16)

300 (12)

320 (12-5/8)

415 (16-3/8)

355 (14)

260 (10-1/4)

Saw chain (300mm: 91PX-46E,

                   350mm: 91PX-52E, 

                   400mm: 91PX-56E, 

                   450mm: 91PX-62E)  

Guide bar (300mm: Double guard 12",

                       

350mm: Double guard 14",

                  400mm: Double guard 16", 

                  450mm: Double guard 18")

O

ptional  accessories

Saw chain (91PX) (300/ 350/ 400/ 450mm)

Guide bar (Double guard) (300/ 350/ 400/ 450mm)

Chain cover

Chain oil

*

6

: for UC3050A only

*

7

: for UC4050AKX only

*

8

: for UC3551AK only

Weight according to

EPTA-Procedure 01/2003

*

5

: kg

*

4

with Spike bumper, without 

      Guide bar

 

*

5

:

 with 91PX Saw chain and Guide bar

Note: 

The standard equipment may vary by country or model variation.

*

the predecessors of UC3030A, UC3530A, UC4030A, UC4530A

*

UC3051A, UC3551A, UC4051A, UC4551A

*

UC3050A, UC3550A, UC4050A, UC4550A

 

Chain cover

Hook complete

Wrench

*

6

Round file

*

7

,

*

8

505 (19-7/8)

196 (7-3/4)

220 (8-5/8)

200 (7-7/8)

UCxx50A
UCxx51A

T

ECHNICAL INFORMATION

Gauge

91PX: 1.3mm (0.050")

W

L

H

Gloves

*

7

Goggles

*

7

 

Chain oil set

*

7,

*

8

 

Steel case

*

7,

*

8

 

Guide bar

Summary of Contents for UC3050A

Page 1: ...omatic chain oiling Protection from electric shock Power supply cord m ft Model No UC3050A UC3051A UC3550A UC3551A UC4050A UC4051A UC4550A UC4551A 14 5 870 2 900 UK 10 32 8 Germany Sweden Reunion Chin...

Page 2: ...e following portions designated with the black triangle to protect parts and product from unusual abrasion Fig 1 Item No Description Link plate complete Compression spring 9 Coil portion Gear housing...

Page 3: ...ve Front handle 6 Remove Gear housing cover 7 Pull out Connector A straight from the nipple of Oil pump complete through Gear housing then remove Oil tank from Gear housing When removing Oil pump comp...

Page 4: ...ge of Gear housing with a plastic hammer 4 Disassemble Oil pump complete from Gear housing by loosening 4x18 Tapping screw Fig 3 Brush holder cap Brush holder cap Motor housing Gear housing 4x18 Tappi...

Page 5: ...5 Fig 4 Fig 5 Fig 6 Fit two pins of Oil pump complete into the cavities of Gear housing Then tighten Oil pump complete with 4x18 Tapping screw pins Oil pump 4x18 Tapping screw pin holes 4x18 Tapping...

Page 6: ...Fig 8 4 Remove Spiral bevel gear 12 by unscrewing M8 Hex nut Then remove Ball bearings from Armature with 1R269 3 Pull out Armature assembly from Motor housing Motor housing Gear housing section M8 H...

Page 7: ...parts by reversing the disassembly procedure Refer to Figs 9 8 and 7 Ball bearing 606ZZ Retaining ring S 10 Worm gear Spiral bevel gear 37 Spiral bevel gear 37 Spiral bevel gear 37 Ball bearing 6001ZZ...

Page 8: ...one as drawn in Fig 2 Note Be careful not to lose Compression spring 6 2 Disassemble Brake mechanism as drawn in Fig 10 Front hand guard Front handle Front hand guard Retaining ring E type 6 Flat wash...

Page 9: ...ousing Hook of Link plate complete for hooking Brake band Rib of Bearing housing 3 Link plate complete section can now be disassembled by prying it up with a slotted screwdriver 4 Remove Brake band fr...

Page 10: ...versing the disassembly procedure Refer to Figs 11 and 13 Note Put O ring 6 to Gear housing before assembling Bearing housing to Gear housing Fig 13 Compression spring 9 Pin of Bearing housing The rou...

Page 11: ...s used for some countries 4 White lead wire is used for some countries brown 3 blue 4 blue orange orange orange Gear housing cover side Sprocket cover side yellow red Choke coil 2 orange Power supply...

Page 12: ...w 2 Pull out Field s lead wires yellow white orange through the holes of Motor housing as shown below Motor housing Switch for Kickback brake Switch for Kickback brake Makita or DOLMAR logo Makita or...

Page 13: ...pressor between Rib F and Rib G while facing its wire connected side to the bottom of Handle L Route Controller s lead wires blue red between Bearing box of Motor housing and Rib E Fix Controller s le...

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