Method For Checking And Maintenance Air Conditioner - Komatsu PC290LC-11 Operation & Maintenance Manual

MAINTENANCE

METHOD FOR CHECKING AND MAINTENANCE AIR CONDITIONER

SERVICE ITEM
Some maintenance items of the air conditioner are to be inspected periodically and the others are to be inspect-
ed when required. Check and maintenance the air conditioner according to the following list to use it effectively.
Check, maintenance
item
Refrigerant (gas)
Air conditioner con-
denser
Compressor
V-belt
Blower motor, fan
Control mechanism
Piping mounts
Even during the off-season, operate the air conditioner for 3 to 5 minutes once a month to maintain the oil film at
all parts of the compressor.
CHECK LEVEL OF REFRIGERANT (GAS)
If the refrigerant used in the air conditioner gets into your eyes or is splashed on your hands, it may
cause loss of sight or frostbite. Never touch the refrigerant.
Do not loosen any part of the refrigerant circuit.
Do not bring any open flame close to any point where the refrigerant gas is leaking.
If the level of the refrigerant (gas) is low, the cooling effect will be reduced. Perform the check while running the
engine at full throttle and operating the air conditioner at high speed.
Check the condition of the refrigerant gas (chlorofluorocarbon
134a) that circulates the refrigerant circuit, through sight glass
(1) (inspection window) at the refrigerant hose fitting.
Content of check, maintenance
Charge amount
Clogged fins
Operating condition
Damage, tension
Operating condition (Check for unusu-
al noise)
Operating condition (Check that func-
tion is normal)
Mounting condition, looseness at tight-
ening or connecting portions, leakage
of gas, damage
k k
Guideline for maintenance interval
Twice a year (spring, autumn)
Every 500 hours
"METHOD FOR CHECKING AND CLEANING
RADIATOR FINS, OIL COOLER FINS, AFTER-
COOLER FINS, FUEL COOLER FINS, AND
AIR CONDITIONER
(4-50)"
Every 4000 hours
Every 250 hours
"METHOD FOR CHECKING AIR CONDITION-
ER COMPRESSOR BELT (4-43)"
When required
When required
When required
WARNING
MAINTENANCE PROCEDURE
CONDENSER FINS
4-31