Thermal Fan Switch (Workman HDX and HDX--D)
The thermal fan switch is threaded into the thermostat
housing on the engine (Fig. 32). The fan switch is a nor-
7. Install fan switch to the water pump.
mally open switch that closes when the engine coolant
A. Clean threads of water pump housing and switch
thoroughly.Apply thread sealant to the threads ofthe
switch.
temperature reaches approximately 198oF (92oC).
There is a green wire attached to the switch. When the
thermal fan switch closes, the radiator fan is energized.
B. Install switch into the water pump housing and
tighten. Torque from 16 to 20 ft--lb (22 to 27 N--m).
Testing
1.
gine, apply parking brake and remove key from ignition
switch.
Park machine on a level surface, raise bed, stop en-
C. Connect green wire harness wire to switch.
Fill engine cooling system.
8.
9.
2.
from lowering.
Install bed support on bed lift cylinder to prevent bed
Remove bed support from lift cylinder and lower bed.
1
CAUTION
Make sure engine is cool before removing the
thermal fan switch.
2
3.
Lower the coolant level in the engine, remove wire
harness connector from thermal fan switch and remove
the switch from the engine.
3
4.
Putfanswitchinacontainer ofoilwithathermometer
and slowly heat the oil (Fig. 33).
Figure 32
CAUTION
1.
2.
Thermostat housing
Thermal fan switch
3.
Temp sender
Handle the hot oil with extreme care to prevent
personal injury or fire.
NOTE: Prior to taking resistance readings with a digital
multimeter, short the meter test leads together. The me-
ter will display a small resistance value (usually 0.5
ohmsorless).Thisresistanceisduetotheinternalresis-
tance of the meter and test leads. Subtract this value
from from the measured value of thecomponent you are
testing.
5.
Check continuity of the switch with a multimeter
(ohms setting). The thermal fan switch is normally open
and should close at approximately 198oF (92oC). As the
Figure 33
switch cools, it should open at approximately 180oF
(82
oC).
6.
Replace thermal fan switch if necessary.
Workman HD Series
Page 8 -- 23
Electrical System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Document Type | Service Manual |
| Language | English |
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