Komatsu PC88MR-10 Shop Manual page 412

30 Testing and adjusting
Hydraulic system
3) Start the engine, run it at high idle, and
relieve the circuit by moving the bucket in
CURL direction.
Be careful not to operate the lever to
"Bucket DUMP" side.
4) 30 seconds after starting relief, measure the
amount of oil leakage for 1 minute.
5) Restore the machine after finishing the test.
4. Testing oil leakage of boom swing cylinder
1) Fully extend the swing cylinder to the right
SWING stroke end and stop the engine.
Release the remaining pressure in the
piping on the boom swing cylinder
head side (however, operate the lever
only in the right SWING direction). For
details, see "Releasing remaining
pressure in hydraulic circuit".
2) Disconnect hose (4) on the cylinder head
side and block the hose side by using a plug.
Be careful not to disconnect the hose
on the cylinder bottom side.
a Use the following parts to block the hose.
07376-70315 (Plug #03)
3) Start the engine, run it at high idle, and
relieve the circuit by right swing.
Be careful not to operate the lever to
"Left SWING" side.
30-62
4) 30 seconds after starting relief, measure the
amount of oil leakage for 1 minute.
5) Restore the machine after finishing the test.
5. Testing oil leakage of blade cylinder
1) Start engine and drive the machine so that
tracks (idler side) get onto the wooden blocks,
etc. to raise the front side of machine.
Raise the front side of machine until
blade does not touch the ground even
when the blade lift cylinder is
extended to its LOWER stroke end.
Set work equipment lock lever to
LOCK position and put blocks under
the rear of tracks.
2) Fully extend the blade cylinder to its LOWER
stroke end and stop the engine.
Release the remaining pressure in the
piping on the blade cylinder head side
(however, operate the lever only in the
blade LOWER direction). For details,
see "Releasing remaining pressure in
hydraulic circuit".
3) Disconnect hose (5) on the cylinder head
side and block the hose side by using a plug.
Be careful not to disconnect the hose
on the cylinder bottom side.
a Use the following parts to block the hose.
07376-70315 (Plug #03)
4) Start the engine, run it at high idle, and
relieve the circuit by lowering the blade.
Be careful not to operate the lever to
"Blade RAISE" side.
5) 30 seconds after starting relief, measure the
amount of oil leakage for 1 minute.
6) Restore the machine after finishing the test.
6. Testing oil leakage of swing motor
1) Remove cover (6).
PC88MR-10