Power Relay (Four Terminals) - Toro Workman HDX Service Manual

Power Relay (Four Terminals)

The main power relay is used to provide electrical power
to the majority of the Workman circuits. When the igni-
tion key is in either the ON or START position, the main
power relay is energized. The main power relay is at-
tached to the relay bracket under the right side of the bed
near the rear axle (Fig. 19).
Besides the main power relay, Workman HDX--D ve-
hicles (diesel engine) use an additional power relay to
supply electrical power to the glow plugs. The glow plug
controller determines when the glow relay is energized.
The glow relay is attached to the relay bracket (Fig. 19).
Testing
1. Park machine on a level surface, raise bed, stop en-
gine, apply parking brake and remove key from ignition
switch.
2. Install bed support on bed lift cylinder to prevent bed
from lowering.
3. Locate power relay to be tested and disconnect the
machine wire harness connector from the relay. Re-
move relay from machine for easier testing.
NOTE: Prior to taking small 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 val-
ue from from the measured value of the component you
are testing.
4. Verify coil resistance between terminals 85 and 86
with a multimeter (ohms setting) (Fig. 20). Resistance
should be approximately 72 ohms.
5. 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 have continuity be-
tween terminals 30 and 87 as +12 VDC is applied to ter-
minal 85. The relay should not have continuity between
terminals 30 and 87 as +12 VDC is removed from termi-
nal 85.
6. Replace relay if testing determines that relay is faulty.
7. After testing is complete, install relay to relay bracket
and connect wire harness connector to relay.
8. Remove bed support from lift cylinder and lower bed.
Electrical System
HDX MODELS
HDX- -D MODELS
HD MODELS
1. Main power relay
86
85
Page 8 - - 16
1
1
2
1
Figure 19
2. Glow relay
87
30
85
87
30
Figure 20
Workman HD Series
86