Check Air Conditioner - Hitachi ZAXIS 135US-5B Operator's Manual

Check Air Conditioner

Check pipe connections for refrigerant gas leakage
If oil seepage is found around pipe connections, it indicates
possible gas leakage.
Check Refrigerant
Start the engine and run at approximately 1500 min
Turn the air conditioner switch to ON. Set the blower switch
to HI and set the temperature control switch to the coolest
position (18 °C on the monitor screen). Operate the air
conditioner 2 to 3 minutes. Check if cool air comes out from
the vent in the cab.
Kind of refrigerant and amount when shipping the
machine
Model
ZX135US-5B
ZX225US-5B, 225USLC-5B
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 Maintenance Section.)
Check compressor
After operating the air conditioner for 5 to 10 minutes,
touch both the high pressure pipe and the low pressure
pipe.
If normal, the high-pressure side pipe will be hot, and the
low-pressure side cold.
Check mounting bolts for looseness
Confirm that the compressor mounting bolts and other
mounting/fastening bolts are securely tightened.
MAINTENANCE
(rpm).
−1
Type Amount
0.85±0.05 kg
HFC134a
0.85±0.05 kg
7-104
Oil Seepage
Detail
M1CD-07-038
M157-07-041