Komatsu PC1250-11, Original Instructions Manual

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Check and mainte-
nance items Content of check and mainte-
nance 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”
Compressor Operating condition Every 4000 hours
V-belt Damage Every 1000 hours
“METHOD FOR CHECKING AND REPLACING
ALTERNATOR AND AIR CONDITIONER COM-
PRESSOR DRIVE BELT”
Blower motor, fan Operating condition (Check for un-
usual noise) When required
Control mechanism Operating condition (Check that
function is normal) When required
Piping mounts Mounting condition, looseness at
tightening 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 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. Run the engine at high idle, and check the flow of
the refrigerant gas (Hydrofluorocarbons HFC-134a) in the re-
frigerant circuit through the sight glass (2) (inspection window)
of the receiver (1) when the cooler is running at high speed.
The receiver (1) is located inside of tool box door rearward of
the cab.
(A) No bubbles in refrigerant flow: Suitable
(B) Some bubbles in refrigerant flow (bubbles pass continuous-
ly): Insufficient
(C) Colorless, transparent: No refrigerant
REMARK
When there are bubbles, the refrigerant gas level is low. Con-
tact your Komatsu distributor to have refrigerant added. If the
air conditioner is operated with the refrigerant gas level low, it
will cause damage to the compressor.
MAINTENANCE PROCEDURE MAINTENANCE
4-28