Repair Instructions (Op No 231); Thermostat; Reconditioning Coolant Pump (320; Reconditioning Coolant Pump (620 - Valtra 6000 Workshop Manual

23. Coolant system

Repair instructions (Op no 231)

A. Thermostat
The thermostat is of a two---way type. Its opening temperature
is 79˚C. In winter a thermostat can be used with an opening
temperature of 83˚C.
Check the function of the thermostat as follows:
--- lower the thermostat into a vessel of boiling water so that the
thermostat does not touch the sides or bottom.
--- opening must begin under 20 seconds.
--- The thermostat must be fully open under 50 seconds.
Stroke, see specifications.
Note! On 8050 ---8750 tractors there are two thermostats. The
opening pressure of the smaller thermostat is 79˚C and the
larger thermostat 83˚C. Check the thermostat in the same
way as described above.
15. 5. 1996
1. 8. 2000
B. Reconditioning coolant pump (320---,
and 420---engines), ---K6490.
1. Drain the engine coolant. Disconnect the water hoses from
the thermostat housing and from the coolant pump. Remove
the thermostat housing and the by ---pass hose.
2. Slacken the alternator fixing bolts. Remove the fan and the
pump belt pulley. Remove the v ---belt.
3. Detach the coolant pump. Remove the pump rear plate and
clean the sealing surfaces.
9052 48900
4. Remove the fan hub using puller 9052 48900. Remove the
circlip from the pump body.
5. Remove the impeller using puller 9022 03500. Press the
shaft out of the pump body in the direction of the fan. Use a
hydraulic press. Support the body so that the shaft bearing
unit has enough space for releasing.
131
Model Code Page
6000-- 8950 231
9022 03500
1