Komatsu PW98MR-10, Operation & Maintenance Manual

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There are 2 types depending on the freezing temperature: –10 °C (14 °F) (general use) and –30 °C (–22 °F)
(cold district use), select according to the area and season.
METHOD FOR CHECKING AND MAINTENANCE AIR CONDITIONER
Check, maintenance items
Some maintenance items of the air conditioner need to be inspected periodically and the others are performed
irregularly. Inspect and service the air conditioner according to the following list to use it effectively.
Check, maintenance
items Content of check, maintenance Guideline for maintenance interval
Refrigerant (gas) Charge amount Twice a year (spring, autumn)
Air conditioner con-
denser Clogged fins Every 500 hours
“METHOD FOR CHECKING AND CLEANING
RADIATOR FINS, OIL COOLER FINS, AFTER-
COOLER FINS, FUEL COOLER FINS, AND AIR
CONDITIONER CONDENSER FINS (4-52)”
Compressor Operating condition Every 4000 hours
V-belt Damage, tension Every 250 hours
“METHOD FOR CHECKING AND ADJUSTING
AIR CONDITIONER COMPRESSOR BELT
TENSION (4-41)”
Blower motor, fan Operating condition(does it make ab-
normal noise?) When required
Control mechanism Operating condition (does it function
normally?) When required
Piping mounts Mounting condition, looseness at tight-
ening or connecting portions, leakage
of gas, damage When required
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)
k k
WARNING
If the refrigerant used in the air conditioner gets into your eyes or 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 high idle 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.
MAINTENANCE MAINTENANCE PROCEDURE
4-25
WENAM00061