Check Air Conditioner (Machine With Cab) - Hitachi ZX27U-2 Operator's Manual

Check Air Conditioner (Machine with Cab)

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WARNING: If refrigerant splashes into eyes or
spills onto skin, blindness or cold contact burn
may result. Never loosen the refrigerant circuit
parts.
Check for refrigerant leaking from the pipe joints
If an oil seepage mark is found at the pipe joints illus-
trated to the right, the refrigerant is possibly leaking.
Check the refrigerant level
After operating the air conditioner in the cooling mode for
2 to 3 minutes with the engine running at 1500 min
(rpm), check the refrigerant level through sight glass
(inspection window) (2) on receiver dryer (1).
Check the condenser
If the condenser surface is contaminated with foreign
matter such as dust or dead insects, cooling perform-
ance may be reduced. Keep the condenser clean. (Refer
to the descriptions for Clean Radiator in MAINTENANCE
section.)
Check the compressor
After operating the air conditioner for 5 to 10 minutes,
touch both high and low pressure pipe lines with your
hands. Normally, the high pressure side should be hot
and the low pressure side should be cool.
Check each bolt for looseness
Check that the compressor mounting bolts and all other
tightening bolts are securely tightened.
Check the compressor belts and fan belts
Check all belts for looseness and/or wear. If any faulty is
found, consult your authorized dealer for receiving de-
tailed inspection.
MAINTENANCE
-1
Depress
[Approx. 98N
Sag:
8 to 10 mm
(0.32 to 0.39 in)
Compressor Pulley
7-62
No Refrigerant
Empty
Sufficient
Quantity
Fan Pulley
(10 kgf, 22 lbf)]
Tension
Pulley
2
1
M1M7-07-057
Insufficient
Quantity
Almost clear. A few
bubbles may appear
when the engine
speed is raised or
lowered.
M107-01-050
Alternator
Pulley
Crank Pulley
M1M7-07-013