High Temperature Shutdown Switch
The high temperature shutdown switch is located near
the glow plug connection on the engine cylinder head
(Fig. 36). There is a blue/white wire attached to the
switch.
The high temperature shutdown switch is designed to
shut the engine off when engine coolant temperature
reaches anunsafelevel.Ifproblems withtheswitchsys-
tem are encountered, the following procedure can be
used to determine if the problem is related to the switch
or the switch circuit:
2
1.
2.
Start engine.
1
Use a jumper wire to ground the high temperature
shutdown switch terminal.
Figure 36
3.
Engineshouldstoprunning indicatingthattheswitch
1.
2.
High temperature shutdown switch
Glow plug connection
circuit is functioning correctly. If the engine continues
runningwiththegroundedjumperwire,theswitchcircuit
needs repair.
VOA
Shutdown Switch Test
CAUTION
Make sure engine is cool before removing the
temperature switch.
Figure 37
1.
temperature shutdown switch.
Lower coolant level in the engine and remove the
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.
2.
and slowly heat the oil (Fig. 37).
Put switch in a container of oil with a thermometer
B. Screw switch into the cylinder head and tighten.
C. Connect blue/white wire to switch.
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
7.
tor’s Manual).
Fill engine cooling system (see Traction Unit Opera-
3.
(ohms setting). The temperature switch is normally
open and should close between 225o to 235oF (107o to
Check continuity of the switch with a multimeter
113
oC).
4.
Allow oil to cool while observing temperature. The
temperature switch should open at about 219oF
(104
oC).
5.
Replace switch if necessary.
Groundsmaster 4500--D/4700--D
Page 5 -- 23
Electrical System (Rev. A)
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