Temperature Gauge - Toro Reelmaster 5500-D Service Manual

Temperature Gauge

The temperature gauge can be tested using a new
gauge as a substitute or by the use of a DC voltage
source and a variable resistance box.
Make sure the voltage source is turned OFF be-
fore connecting it to the electrical circuit to avoid
electrical shock and prevent damaging the
gauge.
1. Connect temperature gauge to the variable resis-
tance and DC voltage source (Fig. 29).
Note: When reading the gauge test point, there are
two white dots on the gauge face below the edge of the
glass cover for the each test point. For each variable re-
sistance setting, the needle must be pointed between
the two white dots.
2. Take test point readings (Fig. 30).
IMPORTANT: Allow circuit to warm up for at least 5
minutes before taking test readings.
A. Set variable resistance to 71 ohms. Apply a 14 +
0.01 VDC to the circuit. The needle should point to
the middle of the green area (80_C).
B. Set variable resistance to 38 ohms. The needle
should point between the green and red area
(105_C).
3. Turn off the voltage source. Disconnect voltage
source, gauge, and variable resistance.
Reelmaster 5500-D
CAUTION
Page 5 - 27
VARIABLE
RESISTANCE
14 VDC + 0.01 VDC
Figure 33
1
Figure 34
1. Middle position
2. High temp position
Electrical System (Rev. C)
+
−
2
3
3. Edge of glass cover