Komatsu PC80MR-5E0, Operation & Maintenance Manual

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Check and maintenance
items Content of check, maintenance Guideline for maintenance interval
Refrigerant (gas) Charge amount Twice a year (spring, autumn)
Air conditioner condens-
er Clogged fins Every 500 hours
“METHOD FOR CHECKING AND CLEAN-
ING RADIATOR FINS, OIL COOLER FINS,
FUEL COOLER FINS, AND AIR CONDI-
TIONER CONDENSER FINS”
Air conditioner compres-
sor Operating condition Every 4000 hours
V-belt Damage, tension Every 250 hours
“METHOD FOR CHECKING AND ADJUST-
ING AIR CONDITIONER COMPRESSOR
BELT TENSION”
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 air conditioner compressor.
TEST THE LEVEL OF REFRIGERANT FOR AIR CONDITIONER (GAS)
k k
WARNING
• Never touch the refrigerant.
Do not loosen any part of the refrigerant circuit.
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.
• 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 (Hydrofluorocarbons HFC-134a) that circulates the refrigerant circuit,
through the sight glass (1) (inspection window) of the receiver.
(A) Proper
No bubbles in refrigerant flow
(B) Insufficient
Some bubbles in refrigerant flow (bubbles pass continuously)
(C) None
Transparent with no color
REMARK
When there are bubbles, the refrigerant (gas) level is low, so ask your Komatsu distributor to add refrigerant. If
the air conditioner continues to run with low refrigerant (gas) level, it will cause damage to the compressor.
RKA68830
MAINTENANCE PROCEDURE MAINTENANCE
4-38
WENAM00241