Engine Temperature Sender - Toro Reelmaster 7000-D Service Manual

Engine Temperature Sender (Kubota Diesel Engine Only)
All Reelmaster 7000−D machines have an engine tem-
perature sender. The sender is used as an input for the
Toro Electronic Controller (TEC) to identify if the engine
coolant temperature has reached an excessive level.
For machines with Yanmar diesel engines, refer to the
Yanmar Service Manual and the Yanmar Troubleshoot-
ing Manual for sender testing information.
For machines with Kubota diesel engines, the engine
temperature sender is located near the alternator on the
coolant flange attached to the engine cylinder head
(Fig. 52).
Testing
If the engine coolant temperature is not displayed on the
InfoCenter during machine operation (see InfoCenter
Display in this chapter), or if the temperature indicator
remains stationary after starting the machine, proceed
with the following test procedure:
1. Park machine on a level surface, lower cutting units,
stop engine, apply parking brake and remove key from
ignition switch. Open hood to gain access to engine.
CAUTION
Make sure engine is cool before removing the
temperature sender from engine.
2. Remove radiator cap. Lower coolant level below
temperature sender by draining coolant into a suitable
container using the radiator draincock.
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
3. Put sender in a container of oil or coolant with a ther-
mometer and slowly heat the oil (Fig. 53).
NOTE: Prior to taking resistance readings with a digital
multi meter, 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.
Reelmaster 7000−D
1. Temperature sender
4. Check resistance of the sender with a multimeter
(ohms setting) as the temperature increases. Replace
sender if specifications are not met.
OIL TEMP
68F (20C)
140F (60C)
212F (100C)
5. Clean threads of coolant flange thoroughly. Allow
sender to cool and clean threads of sender thoroughly.
Apply thread sealant to the threads of the sender.
6. Screw sender into the coolant flange and tighten
from 16 to 20 ft−lb (22 to 27 N−m).
7. If the engine temperature sender tests correctly and
a circuit problem still exists, check wire harness (see
Electrical Schematic and Wire Harness Drawings in
Chapter 10 − Foldout Drawings in this manual).
8. After testing is completed, connect harness electri-
cal connector to the engine temperature sender.
9. Fill engine cooling system.
Page 6 − 51
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2
Figure 52
2. Alternator
Figure 53
TEMP SENDER RESISTANCE
11.4 to 13.6K ohms
2.3 to 2.7K ohms
640 to 720 ohms
Electrical System