Hydraulic Oil Temperature Sender - Toro Reelmaster 7000-D Service Manual

Hydraulic Oil Temperature Sender

A temperature sender is used as an input for the Toro
Electronic Controller (TEC) to identify if the hydraulic oil
temperature has reached an excessive level. The hy-
draulic oil temperature sender is attached to the rear
axle motor (Fig. 50).
Testing
If the hydraulic oil temperature is not displayed on the In-
foCenter during machine operation (see InfoCenter Dis-
play 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,
engage parking brake and stop engine. Remove key
from ignition switch.
2. Locate hydraulic oil temperature sender on bottom of
rear axle motor. Disconnect wire harness connector
from sender.
3. Thoroughly clean area around temperature sender
and remove sender from rear axle motor.
4. Plug the port in the rear axle motor to prevent system
contamination.
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
5. Put sensing end of sender in a container of oil with
a thermometer and slowly heat the oil (Fig. 51).
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.
A. The meter should indicate from 11.6 to 13.5 kilo
ohms at 68F (20C).
B. The meter should indicate from 2.3 to 2.5 kilo
ohms at 140F (60C).
Electrical System
1
1. Rear axle motor
C. The meter should indicate from 605 to 669 ohms
at 212F (100C).
D. Replace sender if specifications are not met.
7. After allowing the sender to cool, install new O−ring
on sender, remove the plug from the rear axle motor,
and thread sender into motor port. Torque sender from
9 to 11 ft−lb (12.3 to 14.9 N−m).
8. If the hydraulic oil 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).
9. After testing is completed, connect harness electri-
cal connector to the hydraulic oil temperature sender.
10.Check and fill hydraulic system to proper level.
Page 6 − 50
FRONT
2
Figure 50
2. Oil temp sender
Figure 51
Reelmaster 7000−D