Releasing Remaining Pressure In Hydraulic Circuit - Komatsu WA250-6 Shop Manual

120 Testing and adjusting, Part 2

Releasing remaining pressure in hydraulic circuit

Releasing remaining pressure in
hydraulic circuit
Releasing remaining pressure between each
hydraulic cylinder and control valve
a If the piping between the hydraulic cylinder and
the control valve is to be disconnected, release
the remaining pressure from the circuit as fol-
lows.
1. Lower the work equipment to the ground, and
stop the engine.
2. Loosen the oil filler cap slowly to release the
pressure inside the tank.
3. Operate the control levers.
a When the levers are operated 5 – 6 times
to release all the remaining pressure.
Releasing remaining pressure in brake accumu-
lator circuit
a If the piping between the ACC charge valve
and brake accumulator, between the ACC
charge valve and parking brake valve, and
between the accumulator and brake valve is to
be disconnected, release the remaining pres-
sure from the circuit as follows.
1. Stop the engine.
2. Depress the brake pedal at least 100 times to
release the pressure inside the brake accumu-
lator circuit.
Releasing remaining pressure in PPC accumu-
lator circuit
a If the piping between the PPC accumulator
and PPC valve is to be disconnected, release
the remaining pressure from the circuit as fol-
lows.
1. Lower the work equipment to the ground, and
stop the engine.
2. Operate the control lever 5 – 6 times to release
all the remaining pressure from the circuit.
WA250, 250PZ-6
1
SEN03837-01
35
30-120