Valve Block Working Hydraulics, Changing; Steering Servo, Changing - Husqvarna P 520D Workshop Manual

Hydraulic System

Valve Block Working Hydraulics, Changing

Tools Dimension
Combination
wrench
Combination
wrench
Combination
wrench
Socket wrench
Torque wrench
Torx
Dismantling
1. Dismantle the side cover.
2. Dismantle the valve lever (1). Loosen the lock
nut (2) first and then screw out the valve lever.
3. Place a container under the valve block to
collect the waste oil.
4. Loosen the hydraulic lines from the valve block
connections (5). Fit protective plugs.
5. Dismantle the three retaining screws (3) holding
the valve block (4) and remove the block.
6. Clean thoroughly as instructed.
7. If the valve block is being changed, remove the
adapters from the block.
2
5
1. Valve lever
2. Lock nut
3. Screw
Assembling
1. Assemble in the reverse order. The adapters
are torque tightened to the block with 50 Nm.
2. Assemble and torque tighten the hoses as
instructed.
3. The block screws (3) are tightened to 24 Nm.
4. Start the machine and check the function.
5. Check for any leaks in the hydraulic system and
top up with oil if necessary.
56
– English
Quantity
13
1
3
4
6
4. Valve block
5. Hydraulic connections
6. Plastic cover

Steering Servo, Changing

Tools Dimension
Socket wrench
Socket wrench
Allen Key
Allen Key
Combination
wrench
Combination
wrench
Combination
wrench
Combination
wrench
Combination
wrench
Torque wrench
U-grip for torque
wrench
U-grip for torque
wrench
Torx
Dismantling
1. Drain the hydraulic system.
2. Dismantle the steering wheel hub (5) by
carefully prising it loose with a screwdriver.
3. Dismantle the steering wheel (4), secured using
one screw (6) under the steering wheel hub (5).
Retain the key (5) and the washer (7). Dismantle
the cover (2) over the steering servo housing.
IMPORTANT!
Do not use force, use a puller if the steering
wheel is stuck hard.
4. Unscrew the four screws holding the cover (2) in
front of the steering servo housing.
4
5
3
2
1. Power steering
2. Cover
3. Key
4. Steering Wheel
Quantity
8 1
13 1
5 1
6 1
14 1
16 1
17 1
19 1
22 1
1
17 1
22 1
T30 1
6
7
1
5. Steering wheel hub
6. Screw
7. Washer