Komatsu PC88MR-10 Shop Manual page 512

40 Troubleshooting
Related information on troubleshooting
a The pump may suction the air if the
pressurization is not performed for the
hydraulic tank, and it may have harmful
effect to the devices.
1) Fully extend the cylinders for boom, arm, and
bucket.
2) Remove the oil filler cap.
3) Install the oil filler cap.
b4. Check of hydraulic oil strainer
Immediately after the engine is stopped, its
parts and oil are still very hot, and may cause
burn injury. Accordingly, wait until all parts
have cooled down before starting the work.
When you remove the oil filler cap, oil may
spurt out. Be careful to rotate it slowly, and
release inner pressure gradually.
1. Lower the work equipment to the ground.
2. Stop the engine, open the soil cover, loosen bolt
(1), and then remove plate (2) on the upper
surface of hydraulic tank oil filler port (F).
3. Remove the cap of oil filler port (F) of the
hydraulic tank, and release the internal
pressure.
4. Remove the bolts to remove cover (3).
When removing the bolts, keep pressing down
cover (3) since it may jump out by spring (4).
5. Pull out the top of rod (5) upward, and remove
spring (4) and strainer (6).
40-24
6. Remove any dirt stuck to strainer (6), then wash
it in clean flushing oil. If strainer (6) is damaged,
replace it with a new one.
7. Insert strainer (6) in projected portion (7) of the
tank to install.
8. Install the bolts while pressing down spring (4)
with the projection at the bottom of cover (3).
Tighten the mounting bolts.
a Check O-ring installed to cover (3), and
replace it if it has any scratches.
b.5 Check of hydraulic oil filter
Immediately after the engine is stopped, its
parts and oil are still very hot, and may cause
burn injury. Accordingly, wait until all parts
have cooled down before starting the work.
When you remove the oil filler cap, oil may
spurt out. Be careful to rotate it slowly, and
release inner pressure gradually.
1. Lower the work equipment to the ground.
2. Stop the engine, open the soil cover, loosen bolt
(1), and then remove plate (2) on the upper
surface of hydraulic tank oil filler port (F).
3. Remove the cap of oil filler port (F) of the
hydraulic tank, and release the internal
pressure.
4. Remove the bolts to remove cover (3).
When removing the bolts, keep pressing down
cover (3) since it may jump out by spring (4).
PC88MR-10