Removal And Installation Of Hst Pump And 4-Gear Pump Assembly - Komatsu WA250-6 Shop Manual

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Removal and installation of HST
pump and 4-gear pump 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
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.
Recover the refrigerant (R134a).
1.
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".
2
50-500

Removal and installation of HST pump and 4-gear pump assembly

4.
Install rubber (1).
1
5.
Disconnect the following hoses.
(2): Hose between accumulator charge
q
valve A port – fan motor
(3): HST motor 2 case drain hose
q
(4): HST motor 1 case drain hose
q
(5): Transfer lubricating oil pump suction
q
hose
(6): Brake valve return hose
q
(7): Clutch solenoid valve return hose
q
[*1]
(8): Hose between HST pump – PPC
q
accumulator
(9): Hose between HST pump – HST drain
q
filter
(10): HST pump T2 port hose (Keep this
q
hose installed since it is disconnected
under the floor)
(11): Steering pump suction tube
q
(12): Hose between charge pump Fe port
q
– HST filter
(13): Hose between charge pump Fa port
q
– HST filter
(14): Brake and fan pump discharge hose
q
(15): Transfer lubrication hose
q
500 Hydraulic system
[*2]
WA250, 250PZ-6

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