Testing Oil Leakage - Komatsu PC88MR-10 Shop Manual

Testing oil leakage

a Testing tools
Sym-
Part No.
bol
Commercially
T
available
a Check this item under the following conditions.
Hydraulic oil temperature: 45 to 55°C
Testing
(PC88MR-C000-364-K-00-A)
1. Testing oil leakage of boom cylinder
1) Set the boom cylinder at RAISE stroke end,
and stop the engine.
Release the remaining pressure in the
piping on the boom cylinder head side
(however, operate the lever only in the
boom RAISE direction). For details,
see "Releasing remaining pressure in
hydraulic circuit".
2) Disconnect hose (1) on the cylinder head
side and block the hose side by using a plug.
Take care not to disconnect the hose
on the cylinder bottom side.
a Use the following parts to block the hose.
07376-70422 (Plug #04)
3) Start the engine, run it at high idle, and
relieve the circuit by raising the boom.
Be careful not to operate the lever to
"Boom LOWER" side.
4) 30 seconds after starting relief, measure the
amount of oil leakage for 1 minute.
5) Restore the machine after finishing the test.
2. Testing oil leakage of arm cylinder
1) Set the arm cylinder to arm IN operation side
to the end of its stroke, and stop the engine.
PC88MR-10
(PC88MR-C000-360-P-00-A)
Part name
Measuring cylinder
30 Testing and adjusting
Release the remaining pressure in the
piping on the arm cylinder head side
(however, operate the lever only in the
arm IN direction). For details, see
"Releasing remaining pressure in
hydraulic circuit".
2) Disconnect hose (2) on the cylinder head
side and block the hose side by using a plug.
Take care not to disconnect the hose
on the cylinder bottom side.
a Use the following parts to block the hose.
07376-70422 (Plug #04)
3) Start the engine, run it at high idle, and
perform the arm digging relief.
Take care not to operate the lever to
"Arm OUT" side.
4) 30 seconds after starting relief, measure the
amount of oil leakage for 1 minute.
5) Restore the machine after finishing the test.
3. Testing oil leakage of bucket cylinder
1) Set the bucket cylinder at its extension stroke
end and stop the engine.
Release the remaining pressure in the
piping on the bucket cylinder head
side (however, operate the lever only
in the bucket CURL direction). For
details, see "Releasing remaining
pressure in hydraulic circuit".
2) Disconnect hose (3) on the cylinder head
side and block the hose side by using a plug.
Take care not to disconnect the hose
on the cylinder bottom side.
a Use the following parts to block the hose.
07376-70422 (Plug #04)
Hydraulic system
30-61