Dolmar PS-34 Istruzioni operative

Page 1

Repair Manual

11/99

PS-34

Page 2

Table of contents

Index Technical Data page 3

Special tools 4

Repair instructions, general 5

01 Chain brake 6

02 Centrifugal clutch 8

03 Oil pump 9 -11

04 Ignition system 11-13

05 Starting system 14-15

06 Carburetor / intake system 16-19

08 Rubber buffer, handles 20

09 Fuel tank, exhaust 21

10 Pistons and cylinders 22-23

11 Crankcase, crankshaft 24-25

Torques 26

Page 3

Technical Data

Stroke volume cm333

Bore mm 37

Stroke mm 31

Max. power at speed kW / rpm 1.3 / 9,000

Max. torque at speed Nm / rpm 1.7 / 6,500

Idling speed / Max. engine speed with guide bar and chain rpm 2,800 / 12,200

Coupling speed rpm 4,500

Sound pressure level LpA av at the workplace per ISO 7182 1) dB (A) 99

Sound power level LwA av per ISO 9207 1) dB (A) 105

Vibration acceleration ah av per ISO 7505 1)

- Tubular handle m/s24

- Rear handle m/s26

Carburetor (diaphragm carburetor) Type ZAMA

Ignition system Type PHELON

Spark plug Type NGK BPMR 7A

Electrode gap mm 0.5

or spark plug Type BOSCH WSR 6F

Fuel consumption at max. load per ISO 7293 kg/h 0.71

Specific consumption at max. load per ISO 7293 g/kWh 550

Fuel tank capacity l 0.37

Chain oil tank capacity I 0.25

Mixture ratio (fuel/two-stroke oil)

- when using DOLMAR oil 50 : 1

- when using other oils 40 : 1

Chain brake engages manually or in case of kickback

Chain speed 2) m/s 17,1

Sprocket pitch inch 3/8

Number of teeth Z 6

Chain type - see the Extract from the spare-parts list

Pitch / Driving element strength inch 3/8 / .043

Guide bar, length of a cut cm 30

Guide-bar type - see the Extract from the spare-parts list

Weight (fuel tank empty, without chain and guide bar) kg 4.7

1) Figures derived in equal part from idle, full-load, and top-speed operation.

2) At max. power

Technical data PS-34

Page 44

Setting gauge for split size

Flywheel / ignition armature

944 500 890

Special tools

Piston stop wedge

944 602 001

Assembly wrench for

clutch blades

944 500 695

Flywheel remover

944 500 880

Assembly and disassembly tool for

oil pump worm

950 500 060

Assembly sleeve 944 500 580

Torx bits unit T27 150 mm

944 500 865

Torx bits unit T27 50 mm

944 500 866

Page 5

Oil and fuel tank

To remove the starter, the oil and fuel

tank cover must be removed. If a residue

is to be left in the tanks, screw tank cover

back on after removing the starter.

Starter

For all work on the motor, ignition and

carburetor, oil pump and starter, the

starter must be removed after 4 screws

(5) have been removed.

General information on repairing the PS-34

The PS-34 chain saw is a small reasonably chain saw.

The objective in developing this saw was to provide a low-priced appliance that could

be assembled as easily as possible. Many of the design features are therefore based

on the concept of easy assembly.

The following tips summarise our experience in terms of carrying out repairs rapidly.

In general, we recommend that you use an electric screwdriver.

The air filter hood is fixed with 3 screws and

must be removed for all work on the motor. In

order to keep out dirt and foreign bodies,

always close the suction duct which is open to

the top.

142

Remove tubular handle.

The tubular handle is removed if work is

carried out on the carburetor, ignition or

motor. For this, remove 2 screws on the

clutch side (2) + (3), plus (4) on the

underside out of the motor housing.

Page 6

10 9a 9b

01-01 Removing the chain brake

Remove sprocket guard, nose bar and chair,

clear the chain intake area.

01-01 Removing the chain brake

Carefully lever out 4 pivots (x) on the

cover plate from the housing sleeves

using a long screw driver.

01-01 Removing the chain brake

The pivots (1) are fixed by a thicker

section in holes in the housing and hold

the cover plate. If pivots break off during

dismantling, replace the cover plate.

01-01 Removing the chain brake

Remove clutch drum (2) and centrifugal

clutch (3, see 02-01), take straining screw

(4) from housing pocket.

01-01 Removing the chain brake

Push out rear sleeve (6) with screw (5), re-

move front sleeve (7), remove Seeger ring (8)

of upper bolt (9a), pull out both bolts (9a + 9b),

remove spring (10) from brake lever from

housing.

01-01 Removing the chain brake

Loosen chain brake to relax packing

spring, loosen screw for hand guard (5)

and unscrew 2-3 rounds.

01 Chain brake

Page 7

01 Chain brake / clutch drum

02-01 Removing the centrifugal clutch

Remove guard ring (4) and washer (5)

and pull clutch drum with bearing off the

crankshaft.

02-01 Checking the clutch drum

Check drive pinion (6), running surface

(7) and external contour (8) (-> brake

spring) for wear and damage. Replace

worn or damaged clutch drums.

01-01 Removing the chain brake

Push cylindrical pin (1) from housing and

remove brake spring holder (2) with joint

piece.

01-07 Replacing the bolt

Tighten the 2 M8 nuts (3) on the bolt

against each other and unscrew bolt

02-01 Replacing the clutch drum

Before assembly, lightly grease the

bearings of the clutch drum (9) with

grease no. 944.360.000.

01-01 Checking the brake spring

Check brake spring for wear and dam-

age. Note: the chain brake is a safety

component, so worn or damaged brake

springs must be replaced.

Page 8

02-01 Removing the centrifugal clutch

Remove exhaust, block motor with piston stop

wedge (1). Loosen blades (2) individually with

special nut 944.500.695.

02-01 Mounting the centrifugal clutch

The thrust washer (3) must be inserted

before the cover washer (4). Make sure

that the assembly sequence is followed

and the blades properly installed.

02-01 Mounting the centrifugal clutch

Blade (5) + (6) w. DOLMAR marking

pointing towards the motor, blade (7) with

marking (8) outwards.

02-01 Mounting the centrifugal clutch

Tighten blades individually with the assem-

bly tool 944.500.695 to 20 +5 Nm.

02 Centrifugal clutch

Page 9

03-02 Removing the oil pump

To remove the oil pump, remove the

suction hose and cylinder, see 10-01.

03-02 Removing the oil pump

Pull oil pump out of oil suction pipe.

Check oil pump piston (3) for damage.

03-02 Removing the oil pump

Empty oil tank if necessary, pull suction

hose out of tank.

03-03 Assembling the oil pump

Before assembly, grease the oil pump

piston (3) and the housing well with

silicon past 980 007 100.

03-04 Air supply to and removal from

oil tank

Clean splint and hole.

03-02 Removing the oil pump

The oil pump piston is driven by the worm (1)

on the crankshaft. The pivot in the holder (2)

fixes the oil pump in the right position and

controls the lifting movement of the piston.

03 Oil pump

Page 10

--->

03-04 Removing the oil suction pipe

Remove the oil suction pipe from the

housing.

03-04 Replacing the oil suction pipe

Insert guide tie (1) into the housing

pocket, push connection nipple (2) firmly

into the hole (3).

03-04 Replacing the oil suction pipe

Grease the flange areas (x) for better

sealing and easier assembly with silicone

paste 980.001.100.

03-04 Installing the oil pump

Position oil pump on worm, insert holder

pivot into the hold (4) of the oil pump and

screw up.

03-04 Removing the worm

Twist the removal and assembly tool

950.500.060 onto the worm (left-handed

thread) and remove from the crankshaft.

03-05 Replacing the worm

Twist the worm (5) into the removal and as-

sembly tool until it is flush (left-handed thread).

Position assembly sleeve 944.500.580 (6)

onto the crankshaft. Push the worm onto the

crankshaft as far as it will go.

03 Oil pump

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