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MAINTENANCE
34. Remove the bolts (17) (3 pieces) and remove the grease
pump holder (18).
35. Turn the HST oil filter cartridge (19) counterclockwise to
remove by using the filter wrench.
36. Clean the filter head.
37. Fill the new filter cartridge with clean oil, coat the seal and
thread portion of the new filter cartridge with oil (or apply
thin film of grease), then install it to the filter head.
38. After the packing surface touches the sealing surface of
the filter head, tighten the filter cartridge approximately 2/3
of a turn.
Komatsu recommends using Komatsu genuine cartridge.
39. Add the refill capacity of oil through the oil filler port (F).
40. Install the cap of oil filler port (F).
41. Check that the oil level is proper.
For checking the oil level, see "METHOD FOR CHECKING OIL LEVEL IN HYDRAULIC TANK, ADDING
OIL (3-124)".
42. Bleed air from the hydraulic circuit.
For the air bleeding procedure of hydraulic circuit, see "METHOD FOR BLEEDING AIR FROM HYDRAUL-
IC CIRCUIT (4-35)".
METHOD FOR CHECKING AND RELEASING NITROGEN GAS CHARGE PRES-
SURE IN ACCUMULATOR (FOR CONTROL CIRCUIT)
The accumulator is charged with high-pressure nitrogen gas, so improper operation may cause an ex-
plosion, which will lead to serious injury or death. For handling, always observe the following.
•
The pressure in the hydraulic circuit cannot be completely removed. When removing the hydraulic
equipment, do not stand in the direction that the oil spurts out when performing the operation. In
addition, loosen the bolts slowly when performing the work.
•
Do not disassemble it.
•
Do not bring open flame close to it or do not dispose of it in fire.
•
Do not perform drilling, welding or flame-cutting.
•
Do not hit or roll it, or subject it to any impact.
•
When disposing of it, the gas must be released. Ask your Komatsu distributor to have this work per-
formed.
NOTICE
If the nitrogen gas charge pressure in the accumulator is low and operations are continued, it becomes
impossible to release the remaining pressure inside the hydraulic circuit if a failure occurs on the ma-
chine.
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WARNING
MAINTENANCE PROCEDURE
4-59
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