Dolmar PS-34 Operating instructions

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.
5
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
3
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.
55
5

Page 6
x
1
32
4
5
8
7
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
6

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.
1
2
01-07 Replacing the bolt
Tighten the 2 M8 nuts (3) on the bolt
against each other and unscrew bolt
3
4
5
6
78
02-01 Replacing the clutch drum
Before assembly, lightly grease the
bearings of the clutch drum (9) with
grease no. 944.360.000.
9
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
1
2
3
4
6
5
7
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.
1
2
23
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
x
3
21
4
--->
5
6
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