Komatsu H70051 Series Operation & Maintenance Manual page 374

MAINTENANCE PROCEDURE
5.
Check the hydraulic oil level.
If the oil level is between H and L of sight gauge (G), it is
proper.
6.
If it is below the L level, refill the hydraulic oil according to
the following procedure.
1)
Remove the bolts (4) (2 pieces) and remove the cover
(5).
2)
Add the hydraulic oil through oil filler port (F).
3)
Install the cover (5) with bolts (4) (2 pieces).
7.
Run the engine at low idle, and extend and retract each of
the steering, bucket, and boom cylinders 4 to 5 times, tak-
ing care not to move them to the stroke end (stop them ap-
proximately 100 mm short of the stroke end).
NOTICE
If the engine is run at high speed immediately after the
startup or a cylinder is pushed up to its stroke end, air
taken inside the cylinder may cause damage to the
piston packing, etc.
8.
Extend and retract each of the steering, bucket, and boom cylinders to the stroke end 3 to 4 times.
9.
Stop the engine, loosen the cap of the oil filler port, and bleed air from the hydraulic tank.
10. Check the hydraulic oil level approximately 5 minutes later.
If the oil level is between H and L of sight gauge (G), it is proper.
11. After bleeding air, install the cover (2) with bolts (1) (4 pieces).
12. Check the HST oil filter for oil leakage.
When the HST oil filter clogging caution lamp lights up, replace the HST filter element even if it has not yet been
used for 1000 hours or 1 year.
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MAINTENANCE