Temperature Sender
The temperature sender is attached to the water pump
housing on the engine. There is a yellow wire attached
to the temperature sender.
4. Install sender to the engine housing.
A. Clean threads of housing and sender thoroughly.
Apply thread sealant to the threads of the sender.
If the ignition switch is in the ON position and the temper-
ature sender has reduced resistance due to high coolant
temperature, the High Temperature Warning indicator
light on the console and the Over Temperature Warning
input LED on the Standard Control Module should be il-
luminated.
B. Thread sender into the housing. Torque sender
from 16 to 20 ft−lb (21.7 to 27.1 N−m).
C. Reconnect wire to sender.
5.
Fill engine cooling system (see Traction Unit Opera-
tor’s Manual).
Testing
CAUTION
Make sure engine is cool before removing the
temperature sender from engine.
1
1.
Lower the coolant level in the engine and remove the
temperature sender from the engine.
2.
thermometer and slowly heat the oil (Fig. 13).
Put the end of the sender in a container of oil with a
Figure 11
Temperature sender (gasoline engine)
1.
CAUTION
1
Handle the hot oil with extreme care to prevent
personal injury or fire.
NOTE: Prior to taking resistance readings with a digital
multimeter, short the meter test leads together. The me-
ter will display a small resistance value (usually 0.5
ohms or less). This resistance is due to the internal re-
sistance of the meter and test leads. Subtract this value
from from the measured value of the component you are
testing.
Figure 12
Temperature sender (diesel engine)
1.
3.
Check resistance of the sender with a multimeter
(ohms setting) as the temperature increases.
A. The meter should indicate more than 600 ohms at
70
oF (21oC).
B. The meter should indicate approximately 460
ohms at 100oF (38oC).
C. The meter should indicate from 54 to 78 ohms at
200
oF (93oC).
D. Replace sender if specifications are not met.
Figure 13
Groundsmaster 3280−D/3320
Page 6 − 13
Electrical System
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