Measuring Oil Leakage - Komatsu PC130-7 Shop Manual

TESTING AND ADJUSTING

MEASURING OIL LEAKAGE

a Measuring instruments fro oil leakage
Symbol Part No.
Commercially
P
available
1. Measuring oil leakage from boom cylinder
1) Run the engine and heighten the engine oil
temperature to 45 – 55°C, and then move
the boom cylinder to the RAISE stroke end.
k Release the residual pressure in the
piping on the boom cylinder head side.
For details, see RELEASING RESID-
UAL PRESSURE IN HYDRAULIC CIR-
CUIT (Operate the lever in the boom
RAISE direction only, however).
2) Disconnect hose (1) on the cylinder head
side and block the hose side with a plate.
k Take care not to disconnect the hose on
the cylinder bottom side.
a Use the following part to block the hose
side.
07376-50422 (Plug No. 04)
3) Run the engine at high idling and relieve the
boom circuit by raising the boom.
k Take care not to "lower the boom".
4) Measure the oil leakage for 1 minute after 30
seconds since relieving is started.
5) After finishing measurement, return the
removed parts.
PC130-7
Part name
Measuring cylinder
MEASURING OIL LEAKAGE
2. Measuring oil leakage from arm cylinder
1) Run the engine and raise the engine oil tem-
perature to 45 – 55°C, and then move the
arm cylinder to the IN stroke end.
k Release the residual pressure in the
piping on the arm cylinder head side.
For details, see RELEASING RESID-
UAL PRESSURE IN HYDRAULIC CIR-
CUIT (Operate the lever in the arm IN
direction only, however).
2) Disconnect hose (2) on the cylinder head
side and block the hose side with a plate.
k Take care not to disconnect the hose on
the cylinder bottom side.
a Use the following part to block the hose
side.
07376-50522 (Plug No. 05)
3) Run the engine at high idling and relieve the
arm circuit by moving the arm IN.
k Take care not to "move the arm OUT".
4) Measure the oil leakage for 1 minute after 30
seconds since relieving is started.
5) After finishing measurement, return the
removed parts.
20-139
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