MAINTENANCE UPON DEMAND
7-30
MAINTENANCE UPON DEMAND
CHECKING THE AIR-CONDITIONING SYSTEM
Check the air-conditioning system twice a year, in spring and au-
tumn.
CHECKING THE COOLANT LEVEL
• If the liquid gets into your eyes or on your hands, it may
cause loss of sight or frostbite: Therefore never loosen
any part of the refrigerant circuit.
Operate the cooler of the air-conditioning system for 5 - 10 min-
utes, then touch the high pressure portion and low pressure por-
tion of the compressor (or high pressure hose and low pressure
hose joint) with your hand. At the same time, inspect the flow of
coolant (R134a) through the sight glass to check the gas level.
Contact your Komatsu dealer for this inspection.
The sight glass is installed next to the receiver at the side of the
condenser. The steps on the right have to be unscrewed and the
condenser swung out for access.
65_15
GK100335
Receiver
Sight glass
COLOR CONDITION NORMAL ABNORMAL
Temperature of high and low
pressures pipes
High pressure pipe is hot.
Low presure pipe is cold.
Clear difference in tempera-
ture.
High pressure pipe is warm.
Low pressure pipe is cold.
Little difference in tempera-
ture.
Amostnodifferenceintem-
perature between high and
low pressure pipes.
Sight glass Almost transparent. All bub-
bles disappear if the engine
speed is increased or
reduced.
Bubbles are always visible.
Sometimes becomes trans-
parent, or white bubbles
appear.
Opaque substance is visible
in the fluid.
Pipe connections Properly connected. Some parts contaminated
with oil.
Some parts heavily stained
with oil.
General conditions of cooler Coolant level correct, no
abnormalitities. Ready for
use.
Ther may be a leak some-
where. Call service repair
shop for inspection.
Almost all coolant has
leaked out. Contact service
repair shop immediately.
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