Hydraulic Couplings, Pipes And Hoses; Hydraulic System - Husqvarna P 520D Workshop Manual

Hydraulic System

Hydraulic Couplings, Pipes and Hoses

Aluminum hydraulic pipes must always be loosened at both ends when dismantling.
It is essential to use two tools, of which one is used as a counterhold, both when loosening and tightening
hoses, so that the hose is not exerted to tensional stress or rotation when tightening. Elbow nipples can fail
or cracks occur when loosening or tightening without counterhold.
When assembling hydraulic lines, first tighten until the tapers make contact, i.e. as far as can be tightened
easily. Then tighten a further one and a half flats. Any further tightening should be avoided. See Tightening
Torques.
Always check and note how hose, lines, pipes, etc. are tightened throughout the machine before loosening
or dismantling. They must always be refitted with the same tightening force as originally.
Always check when assembling hoses and lines, that they go clear of locations where they can be exerted
to chafing and wear.
Always check after refitting hoses, lines, pipes, etc., that there is no leakage.
Hydraulic System
1
4
5
1. Power steering
2. Valve block working hydraulics
3. Hydraulic pump
4. Lift cylinder
44
– English
2
3
6
7
8
5. Front transmission
6. Hydraulic tank
7. Hydraulic filter with valve block
8. Control cylinder
9
9. Rear transmission
10. Hydraulic system cooler
10