Service Manual

High Temperature Shut-Down Switch
1. Lower the coolant level in the engine and remove the
high temperature shut-down switch.
2. Put the switch in a container of oil with a thermometer
a
nd heat the oil.
3. The switch is normally open (N.O.) and should close
at approximately 221
o
F (105
o
C).
CAUTION
Handle hot oil with special care to prevent
personal injury or fire.
2
1
Figure 22
1. High temperature shut-down switch
2. Temperature gauge sender
Figure 23
Temperature Gauge Sender
1. Lower the coolant level in the engine and remove the
temperature gauge sender.
2. Put the switch in a container of oil with a thermometer
and heat the oil.
3. With an Ohm meter connected as shown, the follow-
ing resistance readings should be indicated.
90.5 - 117.5 ohm at 160
o
F (70
o
C)
21.3 - 26.3 ohm at 207
o
F (115
o
C)
Handle hot oil with special care to prevent
personal injury or fire.
CAUTION
Electrical System
Figure 24
Groundsmaster
®
455-D Page 5 - 25 Testing