Komatsu HM400-5, Operation & Maintenance Manual

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6) Fully close the doors and windows.
2.
Check sight glass (2) of receiver drier (1) on the left side of
the engine.
If the condition of sight glass (2) is “correct” as shown in
the figure below, the condition is normal.
If the condition of sight glass (2) is “overfilling” or “insuffi-
cient” as shown in the figure below, ask your Komatsu dis-
tributor for service.
Quantity of refrigerant Condition
Correct
Only few bubbles are contained. Bubbles disappear and the
refrigerant becomes transparent when the engine speed is
increased gradually from idle to 1500 rpm.
Overfilling
No bubble is contained. In this case, both high and low
pressures are high and cooling efficiency is low.
Insufficient
Bubbles pass continuously.
METHOD FOR CLEANING AIR CONDITIONER AIR FILTERS
If the air filter at the suction port of the air conditioner unit or the air filter at the fresh air intake port become
clogged, the cooling or heating capacity will drop, so clean the filters.
When getting on or off the machine with carrying a nozzle and
a brush, place it once in part (A) to ensure your safety.
1.
Open cover (1) on the side of the cab.
2.
Pull out the air filter (fresh air filter).
3.
Clean the air filter (fresh air filter) with compressed air.
MAINTENANCE MAINTENANCE PROCEDURE
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