Husqvarna 250 PS Workshop Manual page 46

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Removal
Disconnect the hydraulic motor from the bar mounting
and hoses. For more information see Hydraulic pump,
Removal, pages 41-42.
Assembly
See Hydraulic pump, Assembly, page 42.
Connect the hoses to the motor and bolt the motor onto
the bar mounting.
Replacing hose couplings.
If a hydraulic hose breaks near a hose coupling it can be
repaired with a repair hose coupling. This hose coupling
can be found in the list of spare parts, square P.
Remove the bar and detach the motor. (see page 43.)
Disconnect the pressure hose and pull it out a short
distance. Cut the hose square and fit the new hose
coupling.
Start by screwing the left-hand threaded outer
component of the hose coupling onto the hose as far as
it will go. (Thread can be lubricated with engine oil or
grease.)
NOTE! The black outer casing must not roll up.
Screw the right-hand threaded inner component of the
hose coupling inside the outer part.
Testing
Use the test hose, part no. 502 42 45-01 to test run the
pruning saw.
WARNING! Never start the pruning saw if the
hydraulic oil tank and hoses are not fitted. If the
hydraulic oil tank is not fitted the clutch may come
loose and cause injury. If the hoses are not fitted
the engine cannot be revved up and the hydraulic
pump and clutch may be damaged.
Connect one end of the test hose (red cover) to the
upper quick coupling on the hydraulic oil tank, and the
other end (grey cover) to the lower quick coupling. Make
sure the couplings click in place. Start the pruning saw.