High Temperature Warning Switch
The high temperature warning switch is located on the
waterpumphousing ontherearoftheengineblock(Fig.
4. Allow oil to cool while observing temperature. The
high temperature warning switch should open at about
208
20).
The high temperature warning switch has a gray
o
F (98 C).
o
wire connected to it.
5.
6.
Replace switch if specifications are not met.
Install switch to the engine housing.
The Standard Control Module monitors the operation of
the high temperature warning switch. If the ignition
switch is in the ON position and the high temperature
warning switch has closed due to excessive coolant
temperature, theModule OverTemperatureWarningin-
putLED should be illuminated. Thehigh temperature in-
dicator light on the control panel should also illuminate.
A. Clean threads of housing and switch thoroughly.
Apply thread sealant to the threads of the switch.
B. Thread switch into the housing. Torque switch
from 16 to 20 ft--lb (21.7 to 27.1 N--m).
Ifthecuttingdecksareengagedwhenthehightempera-
ture warning switch closes, the decks should shut off.
C. Reconnect wire to switch.
7.
tor’s Manual).
Fill engine cooling system (see Traction Unit Opera-
Testing
CAUTION
1
Make sure engine is cool before removing the
temperature switch.
2
1.
er coolant level in the engine and remove the tempera-
ture switch.
MakesureignitionswitchisintheOFFposition.Low-
2.
Put switch in a container of oil with a thermometer
and slowly heat the oil (Fig. 21).
CAUTION
Figure 20
1.
Water pump housing
2.
Warning switch
Handle the hot oil with extreme care to prevent
personal injury or fire.
3.
Check continuity of the switch with a multimeter
(ohms setting).
A. The high temperature warning switch is normally
openandshouldclose between216to226oF(102to
108
oC).
B. Themetershouldindicatemorethan600ohmsat
70
oF (21oC).
C. The meter should indicate approximately 460
ohms at 100oF (38oC).
Figure 21
D. The meter should indicate from 54 to 78 ohms at
200
oF (93oC).
Electrical System
Page 5 -- 16
Groundsmaster 3505--D
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