Hour Meter; Glow Relay - Toro Groundsmaster 4500-D Service Manual

Hour Meter

The meter is located on the control console next to the
operator seat.
1. Connect the positive (+) terminal of a 12 VDC source
to the positive (+) terminal of the hour meter.
2. Connect the negative (--) terminal of the voltage
source to the other terminal of the hour meter.
3. The hour meter should move a 1/10 of an hour in six
minutes.
4. Disconnect voltage source from the hour meter.

Glow Relay

The glow relay is attached to the battery support brack-
et. When energized, the glow relay allows electrical cur-
rent to the engine glow plugs.
Two styles of glow relays have been used on the
Groundsmaster 4500--D/4700--D. On machines with se-
rial numbers below 260000600, two of the four relay
connections are secured with screws (Fig. 21). On ma-
chines with serial numbers above 260000600, the relay
is attached to the wire harness with a four wire connector
(Fig. 22).
NOTE: Prior to taking small resistance readings with a
digital multi meter, 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 val-
ue from from the measured value of the component you
are testing.
1. Verify coil resistance between terminals 86 and 85
with a multimeter (ohms setting).
A. On machines with serial numbers below
260000600, resistance should be from 41 to 51
ohms.
B. On machines with serial numbers above
260000600, resistance should be approximately 72
ohms.
2. Connect multimeter (ohms setting) leads to relay ter-
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should make and break
continuity between terminals 30 and 87 as +12 VDC is
applied and removed from terminal 85.
3. Disconnect voltage and leads from the terminals.
Groundsmaster 4500--D/4700--D
86
85
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Rev. D
Page 5 - - 15
Hobbs
QUARTZ
1
0 0 0 0 1
10
HOURS
+
BACK
Figure 20
87
87
30
85 86
Figure 21
87
30
85
87
30
Figure 22
Electrical System (Rev. A)
30
86