Dual Temperature Switch
The dual temperature switch is attached to the engine
near the alternator on the water flange attached to the
engine cylinder head (Fig. 41). Two (2) electrical har-
ness wires (a blue wire and a yellow wire) are attached
to the switch.
B. Screw switch into the cylinder head and torque
switch from 22 to 28 ft--lb (29.4 to 39.2 N--m).
C. Connect harness wires to switch.
Fill engine cooling system.
6.
The terminal on the switch is used to activate the engine
over temperature warning (Fig. 42). The warning illumi-
nates the overtemp warning light and also causes the
PTO to disengage. The wire harness blue wire attaches
to the switch terminal.
The wire lead on the switch is used to shutdown the en-
gine (Fig. 42). The wire harness yellow wire attaches to
the switch lead.
1
Testing
2
CAUTION
Make sure engine is cool before removing the
temperature switch.
Figure 41
1.
Dual temp switch
2.
Alternator
1.
Lower coolant level in the engine and remove the
dual temperature switch from the engine water flange.
1
3
2.
Put switch in a container of oil with a thermometer
and slowly heat the oil (Fig. 43).
CAUTION
2
Handle the hot oil with extreme care to prevent
personal injury or fire.
Figure 42
1.
2.
Dual temperature switch
Terminal (warning)
3.
Wire lead (shutdown)
3.
Check continuity of the switch with a multimeter
(ohms setting). Both circuits of the temperature switch
arenormallyopenandshouldcloseatthefollowingtem-
peratures:
A. The warning terminal should open from 214o to
226
o F (101 to 108o C).
B. Theshutdownwireleadshouldopenfrom234oto
246
o F (112 to 119o C).
4.
5.
Replace switch if necessary.
Install switch to the water flange.
A. Clean threads of cylinder head and switch thor-
oughly. Apply thread sealant to the threads of the
switch.
Figure 43
Groundsmaster 4000--D
Page 5 -- 27
Electrical System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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