Komatsu PC88MR-10 Shop Manual page 1231

Installation
(PC88MR-K500-720-K-00-A)
Perform installation in the reverse order to
removal.
[*1], [*2]
a When installing the hose for the air conditioner
circuit, be careful not to let dirt, dusts and water
going into the hose.
a Check that O-ring (70) is installed to the joints of
connecting the air conditioner piping when
connecting the piping.
a Do not reuse an O-ring because it is deformed
and deteriorated if used once.
a When removing the O-rings, use a soft tool so
that the piping is not damaged.
a Check that O-ring (70) is free from flaws and
deterioration.
a When connecting the refrigerant pipes, apply
compressor oil for new refrigerant (R134a)
(DENSO: ND-OIL8) to O-ring (70).
Refrigerant tube mounting bolt (M6 x 1.0)
(width across flats: 10):
3.9 to 6.9 Nm {0.4 to 0.7 kgm}
Hose clamp (M6 x 1.0) (width across flats:
10):
8 to 12 Nm {0.8 to 1.2 kgm}
PC88MR-10
50 Disassembly and assembly
a Be sure to fit the cap to the air conditioner unit
side and piping side when removing the air
conditioner piping.
a When installing the heater core hose, install it so
that the white line (mark) on the heater hose
becomes a straight line to avoid any twist of the
heater hose.
a Be sure to fit the cap to the air conditioner unit
side and hose side when removing the heater
hose.
Hose outer diameter: 24 mm, Hose inner
diameter: 15.7 mm
Air conditioner outer diameter: 17 mm, Air
conditioner inner diameter: 15 mm
[*3]
Install ducts (23) and (24) according to the
following procedure.
1. Insert ducts (23) and (24) until they hit the
root of right side duct (45) in advance.
2. Rotate machine monitor cover (42) in the
direction of arrow having mounting bolt (44)
as a fulcrum, and then return the cover to the
original position.
3. Pull up ducts (23) and (24) in the direction of
arrow, and insert them.
Refill refrigerant (air conditioner gas: R134a)
Refill the air conditioner circuit with refrigerant
(air conditioner gas: R134a).
Refill amount: 730 ± 50g
Refill air conditioner compressor oil
See Air conditioner, "Handling of compressor oil".
Refill with coolant
Refill it with the coolant to the specified level
through the water filler port. Run the engine to
circulate the coolant through system. Then
check the coolant level again.
Coolant:
12 l l (For details, see "Table of fuel,
coolant and lubricants")
Cab and its attachments
50-203