Check Refrigerant; Replace Air Conditioner Receiver Dryer; Check Compressor And Pulley; Check Compressor - Hitachi ZW 550-6 Operator's Manual

Check Refrigerant

--- every 6 months
1. Start the engine and run at approximately 1500 min
(rpm).
2. 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 (65 °F) on
the monitor screen).
3. Operate the air conditioner 2 to 3 minutes.
Check if cool air comes out from the vent in the cab.
4. In case any abnormality is found in the air conditioner,
consult your nearest authorized dealer.

Replace Air Conditioner Receiver Dryer

--- Every 3 years or 6000 hours
IMPORTANT: Do not release refrigerant into the
atmosphere as this is illegal. Comply with refrigerant
regulations.
Before charging refrigerant, all the refrigerant must be
recovered from the system. Consult your nearest authorized
dealer to replace receiver dryer (1) or to charge the refrigerant.
f
NOTE: This machine uses new refrigerant R134a.
Type Refrigerant No.
HFC R134a

Check Compressor and Pulley

--- once a year
Check the compressor and its vicinity for abnormality in
operation, oil, or refrigerant leakage. Check the pulley for
abnormal noise.

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
Quantity kg
1.00 ± 0.05
7-103
115Z7B-7-102-1
1
90Z7-OM0144
115Z7B-7-103-3