Temperature Sender
The temperature sender is located near the alternator
onthe water flange attached to theengine cylinder head
(Fig. 31). There is a gray wire attached to the terminal
of the switch.
1
Temperature Sender Test
1.
temperature sender from water flange.
Lower coolant level in the engine and remove the
2.
and slowly heat the oil (Fig. 32).
Put switch in a container of oil with a thermometer
2
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
Figure 31
2.
1.
Temperature sender
Alternator
NOTE: Prior to taking resistance readings with a digital
multi meter,short themeter testleadstogether.Theme-
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
fromfromthemeasured valueofthecomponent youare
testing.
VOA
3.
(ohms setting) as the temperature increases.
Check resistance of the sender with a multimeter
Figure 32
A. Themetershouldindicatemorethan600ohmsat
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.
Install sender to the water flange.
4.
A. Clean threads of water flange and sender thor-
oughly. Apply thread sealant to the threads of the
sender.
B. Screw sender into the water flange. Torquesend-
er from 16 to 20 ft--lb (21.7 to 27.1 N--m).
C. Reconnect gray wire to sender. Apply skin--over
grease (Toro Part No. 505--47) to sender terminal.
5.
Fill engine cooling system (see Traction Unit Opera-
tor’s Manual).
Groundsmaster 4500--D/4700--D
Page 5 -- 21
Electrical System (Rev. A)
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