131
Model Code Page
23. Coolant system
1. 8. 2000
6000--8950 231 1
15. 5. 1996
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 thermostatintoa vessel of boili ngwaterso thatthe
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˚Candthe
larger thermostat 83˚C. Check the thermostat in the same
way as described above.
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.
9022 03500
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.
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