Check Air Conditioner - Hitachi 120-3 class Operator's Manual

10
Check Air Conditioner --- daily
1. Check pipe connections for refrigerant gas leakage.
If oil seepage is found around pipe connections, it indi-
cates possible gas leakage.
2. Check the condenser.
If the condenser fins become clogged with dirt or insects,
the cooling effect will be decreased. Be sure to keep it
clean at all times. (Refer to "Clean Radiator Core" in Main-
tenance Section.)
3. Check the compressor
After operating the air conditioner for 5 to 10 minutes,
touch the high-pressure side and low-pressure side pipes
with your hand. If normal, the high-pressure side pipe will
be hot, and the low-pressure side cold.
4. Check mounting bolts for looseness.
Confirm that the compressor mounting bolts and other
mounting/fastening bolts are securely tightened.
5. Inspect belt, check and adjust tension.
Visually check the compressor and fan belts for wear.
Check and adjust belt tension, referring to the illustration
(right).
If cool air does not come out, or any other abnormalities are
found in air conditioner system, see your authorized dealer
for inspection.
MAINTENANCE
Fan Pulley
Crank Pulley
Alternator Pulley
7-81
Tension Pulley
ZX120-3, 180-3 Class
Fan Pulley
Crank Pulley
ZX200-3, 270-3 , 330-3 Class
Compressor Pulley
150
8 to 12 mm
98 N (10 kgf )
M1U1-07-086
5 to 6 mm
98 N (10 kgf )
Compressor Pulley
M1GR-07-007