SEN01057-01 50 Disassembly and assembly
34 PC800, 850-8
Removal and installation of boom
damping valve assembly 1
Removal
k Lower the work equipment to the ground
and stop the engine.
k Loosen the cap of the hydraulic tank gradu-
ally to release the internal pressure of the
hydraulic tank.
k Disconnect the cable from the negative (–)
terminal of the battery.
a Release the remaining pressure from the PPC
circuit.
a Put the plug to the separated hose.
1. Remove tool box (1) positioned in front of the
hydraulic oil tank.
2. Disconnect solenoid wiring connectors (2) (V9
and V10).
3. Disconnect 4 pcs. of hoses (3) and (4)
between the solenoid valve and the damping
valve.
a Separate the hose between the damping
valve and the PPC valve, RH and sepa-
rate the hose between the damping valve
and the relay joint.
4. Remove the mounting bolt to remove damping
valve assembly (5).
Installation
q Installation shall be made in the reversed
procedure of the removal procedure.
q Air bleeding
Carry out air bleeding of the PPC piping circuit
referring to the section “Bleeding air from each
part” in the “Testing and adjusting”.
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