Removal And Installation Of Transfer Assembly - Komatsu WA250-6 Shop Manual

SEN03853-00
Removal and installation of
transfer assembly
Removal
k
Stop the machine on a level ground and set
the lock bar to the frame to fix the front and
rear frames.
k
Lower the work equipment to the ground,
stop the engine, apply the parking brake,
and put chocks under the tires.
k
Operate the work equipment control lever 2
– 3 times to release the residual pressure in
the work equipment circuit.
k
Press the brake pedal at least 100 times to
release the residual pressure in the brake
accumulator circuit.
k
Disconnect the cable from the negative (–)
terminal of the battery.
Precautions for handling refrigerant
q
k
Collect refrigerant (R134a) beforehand.
a Ask professional traders for collecting
and filling the refrigerant (R134a).
a Never release the refrigerant (R134a)
to the atmosphere.
k
If the refrigerant (R134a) gets inside
ones eyes, it may cause blindness.
Therefore, make sure to wear protec-
tive glasses when collecting or filling
the refrigerant. Collecting and filling
work must be conducted by a qualified
person.
k
If the radiator coolant temperature is
high, you may scald yourself with the
hot coolant when disconnecting the
heater hoses and draining the coolant.
Wait until the coolant is cooled, and
then drain the coolant.
1. Recover the refrigerant (R134a).
2. Loosen the radiator cap to drain the coolant.
6
Radiator: 22 l
3. Remove the operator's cab and floor frame
assembly. For details, see "Removal and
installation of operator's cab and floor frame
assembly".
4. Remove the HST pump and 4-gear pump
assembly. For details, see "Removal and
installation of HST pump and 4-gear pump
assembly".
2
50-310

Removal and installation of transfer assembly

5. Remove the cover at the rear of the left ladder
and disconnect HST motor 1 drain hose (1)
1
and charge valve drain hose (2).
6. Remove the cover at the rear of the right lad-
der and disconnect HST motor 2 drain hose
(3).
7. Remove 2 hose clamps (4).
8. Disconnect hose (5).
9. Disconnect hose (6) and remove PPC accu-
[*1]
mulator and bracket assembly (7).
a Fix PPC accumulator and bracket assem-
bly (7) to the machine with ropes.
310 Power train, Part 1
WA250, 250PZ-6