Hydraulic System; Release Remaining Pressure From Hydraulic System; Method For Releasing Remaining Pressure From Hydraulic Tank; Method For Releasing Remaining Pressure In Hydraulic Cylinder Circuit - Komatsu PC500LC-10R Shop Manual

RELEASE REMAINING PRESSURE FROM HYDRAULIC SYSTEM

HYDRAULIC SYSTEM

RELEASE REMAINING PRESSURE FROM HYDRAULIC SYSTEM
Testing tools for releasing remaining pressure from hydraulic system
Symbol Part No.
A 208-62-22550
B Commercially
available
C 208-62-22540
D 208-62-22470
E 208-62-22490
Release the remaining pressure from hydraulic system for troubleshooting by referring to this section.

METHOD FOR RELEASING REMAINING PRESSURE FROM HYDRAULIC TANK

Release the remaining pressure from the hydraulic tank according to the following procedure when removing a
hose or a clamp connected to the hydraulic tank. It is because the hydraulic tank is airtight and pressurized.
1.
Lower the work equipment to the ground in a stable posture, and stop the engine.
2.
Loosen the oil filler cap (1) of the hydraulic tank gradually
to release the air in the tank.
METHOD FOR RELEASING REMAINING PRESSURE IN HYDRAULIC CYLINDER
CIRCUIT
When disconnecting a pipe between a hydraulic cylinder and the control valve, release the remaining pressure
from the circuit according to the following procedure.
Method for releasing remaining pressure in hydraulic cylinder circuit when dis-
connecting the pipe
1.
Lower the work equipment to the ground in a stable posture, and stop the engine.
2.
Turn the starting switch to ON position, set the lock lever to FREE position, and operate the R.H. and L.H.
work equipment control levers forward and backward, and to the right and left.
REMARK
The work equipment is operated by the pressure in the accumulator. Pressure in the accumulator is lost by
operating the work equipment 2 or 3 times.
3.
Set the lock lever to LOCK position, start the engine, and run it with the fuel control dial at MIN (Low idle)
position for approximately 5 seconds to increase the pressure in the accumulator.
4.
Repeat above Step 2. and Step 3. for a couple of times.
5.
Lower the work equipment to the ground and release the remaining pressure in the hydraulic tank. See
"METHOD FOR RELEASING REMAINING PRESSURE FROM HYDRAULIC TANK".
30-60
Part name
Hose
Oil container
Flange
Bleeder
Cap
30 TESTING AND ADJUSTING
Q'ty Remarks
1 Hose inside diameter: 6 mm
1
5 Size: 10
5
5
PC500LC-10R