Removal And Installation Of Hst Motor 1 Assembly - Komatsu WA250-6 Shop Manual

500 Hydraulic system

Removal and installation of HST motor 1 assembly

Removal and installation of HST
motor 1 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 cool-
ant. 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
Remove the operator's cab and floor frame
3.
assembly. For details, see "Removal and
installation of operator's cab and floor frame
assembly".
WA250, 250PZ-6
4. Disconnect front drive shaft (1) from the trans-
fer.
1
5. Disconnect the following wiring harness con-
nectors from the brake accumulator.
(2): CN-T06
q
(3): CN-T11
q
Disconnect the following hoses from HST
6.
motor 1.
(4): T1 port hose
q
(5): T2 port hose
q
(6): A port hose
q
[*1]
(7): B port hose
q
SEN03856-00
[*2]
33
50-500