Replacing Valve Block Working Hydraulics - Husqvarna PT26D Workshop Manual

5. Connections can be interchanged. Mark
the hydraulic hoses so that they are
reassembled on the correct connections.
6. Release the hydraulic lines from the
valve block. Fit protective plugs.
7. Remove the valve block's mounting bolts.
8. Assemble in reverse order. Tightening Torques
for hydraulic lines as set out in the table.
Dismantling and reassembly
1. Remove the electric part from the sole-
noid valves by removing the plastic nut
and O-ring, after which the electric part
can be lifted off from the cartridge valve.
2. Remove the cartridge valves from the
valve block. Do not take apart the car-
tridge valves, faulty valve is replaced
completely.
3. Remove the two rear valves, key width
22 mm.
4. Remove the valve unit, key width 32 mm.
Do not take apart the valve unit, faulty
valve is replaced completely.
5. Remove connections A and B.
Plugged drill conduits must not be opened
6. Clean the block and blow all channels
with clean pressurised air. In particular,
blow clean the restrictor placed under
connection B.
7. Check that the non-return valves' cones
do not jam but spring back. If leaking or
jamming non-return valve is suspected,
replace the entire valve.
8. Assemble in reverse order. Turn the
electric parts as in the figure.

Replacing valve block working hydraulics

1. Drain the hydraulic tank.
2. Remove the driver's seat.
3. Place a container under the valve block
to collect the waste oil.
4. Clean according to the general instructions.
5. Connections can be interchanged. Mark
the hydraulic hoses so that they are
reassembled on the correct connections.
6. Release the hydraulic lines from the
valve block. Fit protective plugs.
7. Remove the valve block's mounting bolts.
8. Assemble in reverse order. Tightening
torque for hydraulic lines as set out in the
table.
REPAIR INSTRUCTIONS
Valve block transmission
Valve block working hydraulics, assembly
8043-190
8043-129
117
English-