Check Refrigerant; Replace Air Conditioner Receiver Dryer; Check Compressor And Pulley - Hitachi ZW 310-6 Operator's Manual

Check Refrigerant

--- every 6 months
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.
IMPORTANT: If recovery or refill of refrigerant is required
during the machine maintenance (including disposing
the machine), contact your refrigerant supplier or your
authorized dealer.

Replace Air Conditioner Receiver Dryer

--- every 6000 hours or three years
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.
Type Refrigerant No.
HFC

Check Compressor and Pulley

--- once a year
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
Quantity kg
R134a 0.9±0.05
(rpm).
-1
7-118
90Z7B-7-104-1
1
90Z7-OM0144
90Z7B-7-104-2