Husqvarna 50 Rancher Manual de instrucciones

50, 50 Special, 51, and 55

Workshop Manual

531 03 00-76

This workshop manual is mainly intended for Husqvarna

50, 50 Special, 51, and 55 models, but certain chapters

can also be used for other models. The manual gives

information about how to repair the saw and how to use

special tools. In order to make sure that the saw will

function properly, always use Husqvarna original spare

parts and accessories.

The information, specifications and illustrations in this

manual are based on the information in effect at time of

printing. Any improvements or changes on these models

will be included in future manual revisions.

Page

Technical Specifications

Service Data

Service Tools

Safety Equipment

Rewind Starter

Ignition System

Centrifugal Clutch

Lubrication System, Oil Pump

Anti-Vibration System

Fuel System

Exhaust System

Cylinder & Piston

Crankcase & Crankshaft

Engine

Displacement - cc (cu. in.)

Bore - mm (in.)

Stroke - mm (in.)

Max. power of speed - rpm

Idling speed - rpm

Clutch engagement speed - rpm

No load free speed - rpm

Ignition system - Electroiux

Air gap - mm (in.)

Spark plug - Champion

NGK

Electrode gap - mm (in.)

49 (3.0)

44(1 .73)

32(1 .26)

8400

2500

3700

12500

0.3 (0.012)

RCJ7Y

BPMR6A

0.5 (0.020)

51 (3.1)

45(1 .77)

32(1 .26)

8400

2500

3700

12500

0.3 (0.012)

RCJ7Y

BPMR6A

0.5 (0.020)

51 (3.1)

45(1 .77)

32(1 .26)

9000

2500

3700

12500

0.3 (0.012)

RCJ7Y

BPMR6A

0.5 (0.020)

53 (3.2)

46(1 .81 )

32(1 .26)

9000

2500

3700

12500

0.3 (0.012)

RCJ7Y

BPMR6A

0.5 (0.020)

Fuel and Lubrication System

Carburetor - Walbro

WA82 WA82 WT170

WTl 70

Fuel tank volume - Iitre (pint)

0.6 (1 .27) 0.6 (1 .27) 0.6 (1 .27) 0.6 (1 .27)

Oil tank volume - Iitre (pint) 0.3 (0.63) 0.3 (0.63) 0.3 (0.63) 0.3 (0.63)

Oil pump capacity at 6000 rpm

cc/rein. 7.0 7.0 7.0 7.0

Oil pump type Automatic Automatic Automatic Automatic

Bar and Chain

Bar length

inch

Chain pitch

Chain speed

.325 m/see

3/8 m/see.

Drive link gauge - mm (in.)

Weight - kg (Ibs)

Weight with 38 cm (15 in.)

guide bar and chain - kg (Ibs)

37-45

15-18

.325

17.417t

****

1.5 (0.058)

5.2 (1 1.5)

6.2 (13.7)

37-45

15-18

.325

17.417t

****

1.5 (0.058)

5.2 (1 1.5)

6.2 (13.7)

37-49

15-20

.325 or 3/8

17.417t

20.2/7t

1.5 (0.058)

5.2 (1 1.2)

6.2 (13.7)

37-49

15-20

.325 or 3/8

17.417t

20.2/7t

1.5 (0.058)

5.2 (1 1.2)

6.2 (1 3.7)

Service Data

& Service Tools

Service Data

Leakage Test

Crankcase/cylinder

Recommended pressure: 30 kPa (0.3 kp/cm2) (4 psi)

Maximum leakage: 20 kPa/30 sec. (0.2 kp/cm2)

psi/30

see)

Service tools for test:

5025038-01

Pressure gauge

5049029-02

Intake/exhaust cover plate, 2 pieces

5025046-01

Sleeves, 2 pieces

5025403-01

Sleeves, 2 pieces

Leakage Test

Carburetor

Recommended pressure: 50 kPa (0.5 kp/cm2) (7.2 psi)

Maximum leakage: No leakage permitted

Service Tools

5025006-01

5025018-01

5025019-01

5025022-01

5025026-01

5025030-09

5025030-12

5025033-01

5025038-01

5025046-01

5025070-01

5025079-01

5025083-01

5025087-01

5025099-01

5025134-02

5025161-01

5025191-01

5025194-01

5027113-01

5027114-01

5049029-02

5049090-01

5052679-12

Assembling pliers, spark plug

Allen key, 4 mm

Allen key, 3 mm

Socket spanner, 8 mm

Puller, complete

Crankshaft installation device, Model 50 serial # 9250857 and up

Crankshaft installation device

Piston Stop

Pressure gauge

Sleeves, 2 pieces

Piston mounting set

Crankshaft seal installation tool

Hook for fuel filter

Allen screwdriver with ball

Worm wheel puller

Air gap gauge, ignition

Crankshaft removal tool

Air gap gauge, spark plug

Flywheel removal tool

Test plug

Tachometer

Intake/exhaust cover plates, 2 pieces

Puller, ball bearing

Flywheel removal tool, Model 50 serial # 9250857 and up

The chain brake system has a strong spring under

tension. This spring activates the chain brake band when

the chain brake is engaged. The spring is located under

a cover plate that must be removed during servicing.

Anytime the cover is removed and the spring is still under

tension it may dislodge without warning. Eye protection

must be worn during disassembly and reassembly of the

chain brake.

Chain Brake

Disassembly

Disengage chain brake. Remove clutch cover retaining

nuts and withdraw cover from the chain saw.

Clean chain brake and clutch cover assembly. Engage

the chain brake by moving the hand guard forward.

Remove hand guard retaining screw. Rethread screw

into pivot sleeve two turns. Press on screw head to drive

out pivot sleeve half on the opposite side.

Turn cover over. Using a suitable punch, drive out

remaining half of pivot sleeve. Separate hand guard from

cover.

Remove the five screws and lift off the cover plate.

CAUTION !

The spring is under tension.

Always wear safety goggles for eye protection.

Using the tip of a flat bladed screwdriver, carefully lift the

end of spring out of the cover.

Press out the pin which holds the linkage arm using a

suitable punch.

Turn the cover over and press out the brake bank

retaining pin with a punch.

Check the brake band for wear. Measure the thickness

of the band. The original thickness of the brake band is

0.80 mm (0.031 in.). The brake band must be exchanged

if the band is worn anywhere along its length to 0.65 mm

(0.026 in.) or less.

If the brake band needs to be exchanged, separate the

band from the linkage by removing the screw.

Assembly

Check all chain brake parts for wear or damage and

replace with new parts if necessary. Lubricate the linkage

and pivots with thin oil.

Assemble the brake band and knee link. Insert the roll

pin into the brake band so the open side of the pin is up

as shown in photo.

Insert the linkage and band assembly into the cover.

Secure the knee link to the cover with the retaining pin.

Slide the brake spring over the linkage spring post.

Using a flat bladed screwdriver, depress the spring, then

carefully press the spring end into the cover.

Install the cover plate.

Press the front hand guard into position. Install the pivot

sleeves and screw. Pull the hand guard back to

disengage the brake.

Mount the bar, chain and chain brake to the saw. Before

running the saw, check the brake function by moving the

hand guard forward until the brake engages. With the

brake engaged, it should not be possible to rotate the

saw chain around the guide bar. Pull the hand guard

back towards the front handle to disengage the brake.

Inertia Chain Brake Function

WARNING !

The engine must be stopped for the following test.

With the engine stopped, hold the chain saw with both

hands. With the chain saw horizontal, position the bar tip

approx. 35 cm (14 in.) above a tree stump or other firm

object such as a solid wood table.

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