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
Содержание PC1250-11
Страница 2: ......
Страница 11: ...Do not repeatedly handle and lift loads FOREWORD VIBRATION LEVELS 1 9...
Страница 24: ......
Страница 66: ......
Страница 67: ...OPERATION Please read and make sure that you understand the SAFETY section before reading this section 3 1...
Страница 73: ...REMARK The above figure does not show all of the caution lamp symbols OPERATION GENERAL VIEW 3 7...
Страница 317: ...MAINTENANCE Please read and make sure that you understand the SAFETY section before reading this section 4 1...
Страница 377: ...Boom d Left side e Right side f Head side g Foot side MAINTENANCE MAINTENANCE PROCEDURE 4 61...
Страница 378: ...Arm h Left side i Right side MAINTENANCE PROCEDURE MAINTENANCE 4 62...
Страница 400: ......
Страница 401: ...SPECIFICATIONS 5 1...
Страница 406: ......
Страница 435: ...REPLACEMENT PARTS 7 1...
Страница 444: ......
Страница 452: ...PC1250 11 PC1250SP 11 HYDRAULIC EXCAVATOR Form No EENAM03651 2018 KOMATSU All Rights Reserved Printed in Belgium 06 2018...