Temperature Sender - Toro Multi Pro 5700-D Service Manual

Temperature Sender

The temperature sender is located near the alternator
on the water flange attached to the engine cylinder head
(Fig. 17). There is a blue wire attached to the terminal of
the sender.
Testing
1. Lower coolant level in the engine and remove the
temperature sender from water flange.
2. Put sender in a container of oil with a thermometer
and slowly heat the oil (Fig. 18).
CAUTION
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 temperature send-
er you are testing.
3. Check resistance of the sender with a multimeter
(ohms setting) as the temperature increases. The tem -
perature sender is normally open and should close be-
o
tween 216 to 226 F (102 to 108
4. Allow oil to cool while observing temperature. The
temperature sender should open at about 208
5. Replace sender if specifications are not met.
6. Install temperature sender to the water flange.
A. Clean threads of water flange and sender thor-
oughly. Apply thread sealant to the threads of the
sender.
B. Tighten sender into the water flange.
C. Reconnect blue wire to sender.
7. Fill engine cooling system (see Operator's Manual).
Electrical System
o
C).
o o
F (98 C).
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1
Figure 17
1. Temperature sender
Figure 18
Multi Pro 5700–D
VOA