Method For Bleeding Air From Hydraulic Circuit - Komatsu D85EX-18 Operation & Maintenance Manual

MAINTENANCE
3.
Press the center between drive pulley (4) and compressor
pulley (5) with a finger.
Pressing force: Approx. 98 N {10 kg}
4.
Adjust the tension so that deflection (A) is 12 to 15 mm.
When the belt is new, it elongates particularly. After 2 to 3
days, be sure to adjust again.
METHOD FOR CHECKING LEVEL OF REFRIGERANT (GAS)
• Be sure to handle the refrigerant (gas) according to the local regulations.
• 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 open flame close to a refrigerant leaking point.
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
(2) (inspection window) of receiver (1).
(A) No bubbles in refrigerant flow: Suitable
(B) Some bubbles in refrigerant flow (bubbles pass continuous-
ly): Insufficient
(C) Colorless, transparent: No refrigerant
REMARK
If bubbles are seen, the gas is insufficient. Ask your Komatsu distributor for adding.
If the air conditioner is operated with the refrigerant gas level low, it will cause damage to the compressor.
New Freon R134a is used as the refrigerant.
METHOD FOR CHECKING DURING OFF SEASON
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.

METHOD FOR BLEEDING AIR FROM HYDRAULIC CIRCUIT

Since the engine must be started and the blade must be operated, see OPERATION.
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WARNING
MAINTENANCE PROCEDURE
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