Engine Temperature Switches (S/N 80001 and Up)
The high temperature warning and shutdown switches
are located near the engine thermostat housing (Fig.
11).
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:
The high temperature warning switch has a green/red
wire attached it.
A. High temperature warning switch should close
when oil temperature reaches 212oF (100oC).
The high temperature shutdown switch has an orange/
black wire attached it.
B. High temperature shutdown switch should close
when oil temperature reaches 232oF (111oC).
Note:
Information on the GM 580--D temperature
gauge sender is included in Chapter 5.
4.
6.
Replace switch if necessary.
Circuit Test
Install switch to the water flange.
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:
A. Clean threads of cylinder head and switch thor-
oughly. Apply thread sealant to the threads of the
switch.
1.
2.
Locate switch to be tested. Start engine.
B. Screw switch into the cylinder head and tighten.
C. Connect wire harness wire to switch.
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.
7.
Fill engine cooling system (see Operator’s Manual).
B. If the shutdown switch terminal is grounded, the
engine should stop running.
3.
Iftheresultswiththegrounded switchterminalarenot
2
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.
1
Switch Test
3
CAUTION
Figure 11
Make sure engine is cool before removing the
temperature warning switch.
1.
2.
3.
High temperature warning switch
Temperature gauge sender
High temperature shutdown switch
1.
Lower coolant level in the engine and remove the
switch that is to be tested.
VOA
2.
Putswitch inacontainer ofoilwithathermometer and
slowly heat the oil (Fig. 12).
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
Figure 12
Groundsmaster 580--D
Page 8 -- 13
Electrical System (S/N 30101 & Up) (Rev. E)
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