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

Main 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 RUN 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 engine (Fig. 23).
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 main power relay and disconnect the ma-
chine wire harness connector from the relay. Remove
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 main power terminals
85 and 86 with a multimeter (ohms setting) (Fig. 24). Re-
sistance should be approximately 72 ohms.
5. Connect multimeter (ohms setting) leads to main
power relay terminals 30 and 87. Ground terminal 86
and apply +12 VDC to terminal 85. The relay should
have continuity between terminals 30 and 87 as +12
VDC is applied to terminal 85. The relay should not have
continuity between terminals 30 and 87 as +12 VDC is
removed from terminal 85.
6. Replace main power relay if testing determines that
relay is faulty.
7. After testing is complete, install main power relay to
relay bracket and connect wire harness connector to
relay.
8. Remove bed support from cargo bed lift cylinder and
lower bed.
Workman HDX Auto
FRONT
1. Main power relay
2. Screw
86
85
Page 6 − 19
3
2
Figure 23
3. Relay bracket
87
30
85
87
30
Figure 24
Electrical System
1
86