Engine Coolant And Hydraulic Oil Temperature Senders; Specifications 6 - Toro Reelmaster 7000 Service Manual

Engine Coolant and Hydraulic Oil Temperature Senders

Two (2) identical temperature senders are used as in-
puts for the TEC controller to identify if either the engine
coolant or hydraulic oil temperature has reached an ex-
cessive level. The coolant temperature sender threads
into the radiator (Fig. 50). The hydraulic oil temperature
sender is attached to the 4WD/2WD control manifold at
the front of the machine (Fig. 51).
Testing
1. Park machine on a level surface, lower cutting units,
stop engine and engage parking brake.
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
testing is necessary. If, however, the Display determines
that the temperature sender and circuit wiring are not
functioning correctly, proceed with test.
3. Locate temperature sender that is to be tested. Dis-
connect wire harness connector from sender.
4. Thoroughly clean area around temperature sender
and remove sender.
5. Put sensing end of sender in a container of oil with
a thermometer and slowly heat the oil (Fig. 52).
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 tested component.
6. Check resistance of the sender with a multimeter
(ohms setting) as the oil temperature increases. Re-
place sender if specifications are not met.
OIL TEMP
o o
68 F (20 C)
o o
140 F (60 C)
o o
212 F (100 C)
Electrical System
SENDER RESISTANCE
11.6 to 13.5 kilo ohms
2.3 to 2.5 kilo ohms
605 to 669 ohms
7. After allowing the sender to cool, install sender:
A. Install new O--ring on sender and thread sender
into port. Torque sender to values identified in correct
illustration (Fig. 50 or 51).
B. Connect wire harness connector to sender.
8. Check and fill system (coolant or hydraulic) to proper
level.
1
1. Radiator
1. 4WD/2WD manifold
Page 5 - - 36 Rev. A
9 to 11 ft- -lb
(12.3 to 14.9 N- -m)
Figure 50
2. Coolant temp sender
20 to 26 ft- -lb
(27 to 35 N- -m)
2
1
Figure 51
2. Oil temp sender
Figure 52
Reelmaster 7000
2