Engine Coolant and Hydraulic Oil Temperature Senders
Two (2) identical temperature senders are used as in-
puts for the TEC--5002 controller to identify if either the
engine coolantorhydraulic oiltemperature hasreached
an excessive level. The coolant temperature sender
threads into the radiator (Fig. 39). The hydraulic oil tem-
perature sender is attached to the 4WD/2WD control
manifold at the front of the machine (Fig. 40).
7. After allowing the sender to cool, install sender:
A. Install new O--ring on sender and thread sender
into port. Torque from 9 to 11 ft--lb (12.3 to 14.9
N--m).
B. Connect wire harness connector to sender.
Check andfill system (coolant orhydraulic) toproper
8.
Testing
level.
1.
decks, stop engine and engage parking brake.
Park machine on a level surface, lower cutting
2.
Before disconnecting temperature sender for test-
ing, the sender and its circuit wiring should be tested as
a TEC input with the Diagnostic Display (see Diagnostic
Display in the Troubleshooting section of this chapter).
If the Diagnostic Display verifies that the sender and cir-
cuit wiring are functioning correctly, no further sender
testingisnecessary.If,however,theDisplaydetermines
that the temperature sender and circuit wiring are not
functioning correctly, proceed with test.
1
2
3.
connect wire harness connector from sender.
Locate temperature sender that is to be tested. Dis-
Figure 39
1.
Radiator
2.
Coolant temp sender
4.
Thoroughly clean area around temperature sender
and remove sender.
5.
a thermometer and slowly heat the oil (Fig. 41).
Put sensing end of sender in a container of oil with
2
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
1
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 tested component.
Figure 40
1.
4WD/2WD manifold
2.
Oil temp sender
6.
(ohms setting) as the oil temperature increases. Re-
place sender if specifications are not met.
Check resistance of the sender with a multimeter
OIL TEMP
oF (20oC)
SENDER RESISTANCE
11.6 to 13.5 ohms
2.3 to 2.5 ohms
68
140
oF (60oC)
212
oF (100oC)
0.6 to 0.7 ohms
Figure 41
Groundsmaster 4500--D/4700--D
Page 5 -- 29
Electrical System
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