Komatsu PC88MR-10 Shop Manual page 1195

1) Start the engine.
2) Set the arm cylinder and bucket cylinder to
the most extended position (maximum arm
IN/bucket CURL position) or the most
retracted position (maximum arm OUT/
bucket DUMP position), and lower the work
equipment to the ground.
a Anti-drop valve is installed to the bottom
side of the boom cylinder.
When the work equipment is lowered with
this posture, the oil in the bottom side of
the boom cylinder is drained, and the
remaining pressure is low.
3) Turn the starting switch to OFF position.
4) Turn the starting switch to ON position.
5) Set the work equipment lock lever in FREE
position, and operate the R.H. and L.H. work
equipment control levers forward and
backward, and to the right and left.
a The work equipment can be operated
with the battery charged in the PPC
accumulator, but the battery charged in it
will be discharged after the work
equipment control lever is operated a
couple of times.
6) Start the engine, run it with the fuel control
dial in MIN (low idle) position for more than
10 seconds so that the PPC accumulator is
accumulated.
7) Repeat the steps 4. to 6. to release the
remaining pressure in the hydraulic cylinder
circuit.
PC88MR-10
50 Disassembly and assembly
8) Set the work equipment lock lever in LOCK
position.
9) Loosen the oil filler cap of the hydraulic tank
slowly, and bleed the air in the hydraulic tank.
a Leave the oil filler cap of the hydraulic
tank removed.
3. Anti-drop valve assembly
1) Place an oil container under the anti-drop
valve assembly to receive oil.
Place an oil mat as well in case the oil
leaks.
2) Remove the clamp (1).
3) Disconnect the connector P46 (2).
4) Remove the clamp (3).
5) Disconnect the hoses (4), and (5).
The remaining pressure may damage
the O-ring, and the oil may be
splashed. Therefore, loosen the hose
while pressing the fitting and around it
with a cloth, etc.
6) Disconnect the tube (6).
The remaining pressure may damage
the O-ring, and the oil may be
splashed. Therefore, loosen the tube
while pressing the fitting and around it
with a cloth, etc.
Work equipment
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