Engine Temperature Switches (S/N 80001 And Up) - Toro Groundsmaster 580-D Service Manual

Engine Temperature Switches (S/N 80001 and Up)

The high temperature warning and shutdown switches
are located near the engine thermostat housing (Fig.
11).
The high temperature warning switch has a green/red
wire attached it.
The high temperature shutdown switch has an orange/
black wire attached it.
Note: Information on the GM 580--D temperature
gauge sender is included in Chapter 5.
Circuit Test
If a problem with either switch system is encountered,
the following procedure can be used to determine if the
problem is related to the switch or the switch circuit:
1. Locate switch to be tested. Start engine.
2. Use a jumper wire to ground the switch terminal.
A. If the warning switch terminal is grounded, the
control panel warning indicator should illuminate
and the audible alarm should sound.
B. If the shutdown switch terminal is grounded, the
engine should stop running.
3. If the results with the grounded switch terminal are not
correct, the switch circuit needs repair (see electrical
schematics and diagrams in Chapter 9 -- Foldout Dia-
grams). If the results with the grounded switch terminal
are correct, the switch should be tested.
Switch Test
CAUTION
Make sure engine is cool before removing the
temperature warning switch.
1. Lower coolant level in the engine and remove the
switch that is to be tested.
2. Put switch in a container of oil with a thermometer and
slowly heat the oil (Fig. 12).
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
Groundsmaster 580--D
3. Check continuity of the switch with a multimeter
(ohms setting). The high temperature warning and shut-
down switches are both normally open and should close
when oil temperature reaches:
A. High temperature warning switch should close
when oil temperature reaches 212
B. High temperature shutdown switch should close
when oil temperature reaches 232
4. Replace switch if necessary.
6. 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.
B. Screw switch into the cylinder head and tighten.
C. Connect wire harness wire to switch.
7. Fill engine cooling system (see Operator's Manual).
1. High temperature warning switch
2. Temperature gauge sender
3. High temperature shutdown switch
Page 8 - - 13 Electrical System (S/N 30101 & Up) (Rev. E)
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o
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1
Figure 11
Figure 12
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F (100 C).
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F (111 C).
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VOA