Main Power, Glow And Operator Cab - Toro Groundsmaster 4000-D Service Manual

Main Power, Glow and Operator Cab Power (Groundsmaster 4010- -D) Relays
The main power, glow and operator cab power relays
are located at the power center behind the operator seat
(Fig. 39). The wire harness is attached to these relays
with a four (4) wire connector (Fig. 40).
The main power relay is used to provide current to the
TEC controllers and most of the fuse protected circuits
(operator seat, power point and optional electric equip-
ment). When the ignition switch is in the ON or START
position, the main power relay is energized.
The glow relay is used to provide current to the engine
glow plugs when the relay is energized by the
TEC--5002 controller. The TEC--5002 controls and mon-
itors the operation of the glow relay.
The operator cab power relay on Groundsmaster
4010--D machines is used to provide current to the oper-
ator cab electrical components. When the ignition
switch is in the ON or START position, the cab power
relay is energized.
Testing
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch. Raise and support hood.
2. To make sure that machine operation does not occur
unexpectedly, disconnect negative (--) cable from bat-
tery and then disconnect positive (+) cable from battery
(see Battery Service in the Service and Repairs section
of this chapter).
3. Remove cover (item 1) and heat shield (item 11) from
power center and locate relay to be tested. If necessary,
remove two (2) flange nuts and carriage screws that se-
cure power center to tank support.
4. Disconnect wire harness connector from relay. Re-
move relay from mounting bracket for testing.
5. Using a multimeter, verify that coil resistance be-
tween terminals 86 and 85 is approximately 72 ohms.
6. 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.
7. Disconnect voltage and test leads from the relay ter-
minals.
Groundsmaster 4000--D/4010--D
8. Secure relay to mounting bracket and connect wire
harness connector to relay. Secure power center to tank
support if it was removed. Install cover (item 1) and heat
shield (item 11) to power center.
9. Connect positive (+) cable to battery and then con-
nect negative (--) cable to battery (see Battery Service
in the Service and Repairs section of this chapter).
10.Lower and secure hood.
3
2
6
7
RIGHT
10
FRONT
1. Cover
2. Screw
3. Flange nut (2 used)
4. Carriage screw (2 used)
5. Screw
6. Mount
86
85
Page 5 - - 33
1
12
11
8
9
4
Figure 39
7. Lock nut
8. Main power relay
9. Glow relay
10. Cab power relay
11. Heat shield
12. Screw (2 used)
87
30
85 86
87
30
Figure 40
Electrical System
5