Check Refrigerant; Check Compressor And Pulley - Hitachi ZW 120-6 Operator's Manual

Check Refrigerant

--- every 250 hours or 3 months
After running the engine at 1500 min
check the refrigerant quantity through sight glass (inspection
port) (1).
This machine uses new Freon R134a as the refrigerant.
Before charging the refrigerant, first collect the entire
refrigerant from the cooling system. Then, charge the
refrigerant by the specified quantity.
In case any abnormality is found in the air conditioner, consult
your nearest authorized dealer
Type Refrigerant No.
HFC R134a
d
CAUTION: Do not dispose FREON into the
atmosphere to prevent depletion of ozone layer and
global warming.

Check Compressor and Pulley

--- every 250 hours or 3 months
Check the compressor and its vicinity for abnormality in
operation, oil stain, or refrigerant leakage. Check the pulley for
abnormal noise.
Check the belt for abnormal deflection and damage.
Check Compressor:
After operating the air conditioner for 5 to 10 minutes,
check temperature at both the high pressure pipe and the
low pressure pipe.
Normally, the high pressure pipe must be hot and the low
pressure pipe must be cool.
MAINTENANCE
-1 (rpm) for a few minutes,
Quantity kg (lb)
0.85±0.05 (1.87±0.11)
7-94
1
M4FC-07-059
Compressor
MNCB-07-012