Service Data - Husqvarna 250 PS Workshop Manual

For Husqvarna Parts Call 606-678-9623 or 606-561-4983
Remember...
...never start the pruning saw if the hydraulic oil
tank or hoses/shaft are not fitted. If the hydraulic
oil tank is not fitted the clutch may come loose and
cause injury. If the hoses or shaft are not fitted the
engine cannot be revved up and the hydraulic
pump and clutch may be damaged.
...the pressure relief valve in the hydraulic motor
must open if there is a blockage in the return hose.
If it opens without reason then it must be replaced.
(See page 45.)
...you must be able to turn the pulley on the starter
unit at least a further 1 1/2 turns when the starter
cord is fully extended.
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1. Service data

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...do not use the pruning saw until it has been
properly adjusted or repaired.
...the pruning saw is fitted with an electronic
ignition system. This produces a powerful spark
with a short burn time. If the performance of the
pruning saw is poor, if the saw is difficult to start,
or if it idles unevenly, first check the spark plug
before taking any other action.
...the pruning saw consists of an engine unit and
a hydraulic unit. It is often easier to handle the
pruning saw when the hydraulic oil tank has been
separated from the engine unit. (See page 38.)
Leak testing
Crankcase, cylinder
Remove the silencer, air filter and carburettor assembly.
Use the carburettor bolts and spacers 502 50 45-01 to
attach cover plate 502 50 72-01 to the inlet side of the
cylinder. Attach cover plate 502 50 71-01 to the exhaust
side of the cylinder. Use pressure tester 502 50 38-01.
Pressure: 0.08 MPa (0.8 kp/cm2)
Max. leakage: 0.02 MPa in 30 sec. (0.2 kp/cm2 in 30
sec.)
Leak testing
Carburettor
Remove the carburettor from the pruning saw. Connect
the hose of the pressure tester to the fuel hose nipple on
the carburettor.
Pressure: 0.03 MPa (0.3 kp/cm2, 4.3 psi)
Leakage: no leakage is permitted.
Tools: 502 50 38-01 Pressure tester