Toro Groundsmaster 4500-D Series Service Manual page 339

Testing (continued)
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
4. Put sensing end of sender in a container of oil with a thermometer and slowly
heat the oil (Figure
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 meter will display a small resistance value
(usually 0.5 ohms or less). This resistance is due to the internal resistance
of the meter and test leads. Subtract this value from the measured value of
the tested component.
Note: Use a infrared temperature instrument to measure the oil temperature.
5. 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 20 ºC (68 ºF).
B. The meter should indicate from 2.3 to 2.5 kilo ohms at 60 ºC (140 ºF).
C. The meter should indicate from 605 to 669 ohms at 100 ºC (212 ºF).
D. Replace sender if specifications are not met.
6. After allowing the sender to cool, install sender into axle motor:
A. Install new O−ring on sender and thread sender into motor port. Torque
sender from 12.3 to 14.9 N·m (9 to 11 ft−lb).
B. Connect wire harness connector to sender.
7. Check and fill hydraulic system to proper level.
219).
CAUTION
Page 6–57 Electrical System: Component Testing