Temperature Sender (Gm 3000-D) - Toro Groundsmaster 3000 Service Manual

Temperature Sender
The temperature sender is located on the top right side
of the water outlet box. It has a green connector with
blue and black wires. The sender supplies a signal to the
glow control unit (Fig. 31).
Make sure engine is cool and coolant system is
depressurized before removing the thermistor.
1. Lower the coolant level in the engine and remove
the thermistor from the water pump.
2. Put the sender in a container of oil with a thermome­
ter and slowly heat the oil (Fig. 33).
Handle the hot oil with extreme care to prevent
personal injury or fire.
3. Check resistance of the sender with a multimeter.
Check resistance between pin 1 and the sender casing
(Fig. 33).
A. The resistance should be from 1088.8 to 1225.4
OHMS at 104 F (40 C).
B. As the temperature increases,the resistance
should be from 166.2 to 185.2 OHMS at 212 F
(100 C).
Electrical System
(GM 3000–D)
CAUTION
CAUTION
TO GLOW CONTROL UNIT
PIN 2 (BLUE WIRE)
Page 6 – 20 Rev. A
TEMP SENDER
Figure 31
TO GROUND
(BLACK WIRE)
Figure 32
Figure 33
Groundsmaster 3000/3000–D