Komatsu PC500LC-10R Shop Manual page 22

SAFETY NOTICE FOR OPERATION
Precautions for disconnecting air conditioner piping
NOTICE
When replacing the air conditioner unit, air conditioner compressor, condenser or receiver drier, etc.,
collect the refrigerant (air conditioner gas: R134a) from the air conditioner circuit before disconnecting
the air conditioner hoses.
REMARK
• Ask a qualified person for collecting, adding and filling operations of the refrigerant (air conditioner gas:
R134a).
• Never release the refrigerant (air conditioner gas: R134a) to the atmosphere.
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Put on the protective eyeglasses, gloves and working clothes with long sleeves while you are col-
lecting or filling the refrigerant. Otherwise, when refrigerant gas (R134a) gets in your eyes, you may
lose your sight, and when it touches your skin, you may suffer from frostbite.
• When loosening the nuts fixing air conditioner hoses and tubes, be sure to use 2 wrenches; use one
wrench to fix and use the other one to loosen the nut.
Precautions for air conditioner piping
• When installing the air conditioner piping, be careful so that dirt, dusts and water do not enter the hose.
• Check that the O-rings are fitted to the joints when connecting the air conditioner piping.
• Do not reuse an O-ring because it is deformed and deteriorated if it is used once.
• When removing the O-rings, use a soft tool so that the piping is not damaged.
• Check that the O-ring is not damaged or deteriorated.
• Apply compressor oil for refrigerant (R134a) to O-ring.
REMARK
Do not apply oil to the threaded portion of a bolt, nut or union.
Manufacturer
DENSO
VALEO THERMAL SYSTEMS
SANDEN
When tightening nuts of the air conditioner hoses and tubes, be sure to use 2 wrenches. Use one wrench to fix
and tighten the nut with the other wrench to the specified torque (Use a torque wrench for tightening).
00-20
ND-OIL8
ZXL100PG (PAG46 or equivalent)
SP-10
00 INDEX AND FOREWORD
Part name
PC500LC-10R