Method For Checking And Maintenance Air Conditioner; Method For Bleeding Air From Hydraulic Circuit - Komatsu D37EX-24 Operation & Maintenance Manual

MAINTENANCE

METHOD FOR CHECKING AND MAINTENANCE AIR CONDITIONER

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 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.
The sight glass (inspection window) is located on the pillar at
the rear left of the machine.
Check the refrigerant gas (Hydrofluorocarbons HFC -134a)
condition with the sight glass (inspection window) of the receiv-
er while the air conditioner is in operation.
(A) Blue: The air conditioner is operated normally.
(B) Pink: The receiver drier needs to be replaced.
If the sight glass (inspection window) is pink, contact your Ko-
matsu distributor for repair.
REMARK
The bubbles or condensation may be generated in the sight glass (inspection window), however, it does not in-
dicate that the refrigerant level is low. It is normal when Hydrofluorocarbons HFC -134a is used. Do not add the
refrigerant gas.
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

Bleed air from the circuit after the filter element or strainer, etc. has been replaced or cleaned.
Since the engine must be started and the blade must be operated, see OPERATION.
For the starting procedure of the engine, see "METHOD FOR STARTING ENGINE (3-150)".
1.
Bleed air from the pump according to the following procedure.
NOTICE
If the pump is operated without filling the pump case with hydraulic oil, abnormal heat will be gener-
ated and this may cause a premature damage to the pump. Be sure to bleed the air.
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WARNING
MAINTENANCE PROCEDURE
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