Main Power, Glow and Cab Power (Groundsmaster 4110--D) Relays
The main power, glow and cab power relays are located
at the power center behind the operator seat (Fig. 34).
The wire harness is attached to these relays with a four
7. Disconnect voltage and test leads from the relay ter-
minals. Replace relay if necessary.
8.
Secure relay to mounting bracket and connect wire
(4)
wire connector (Fig. 35).
harness connector torelay.Secure power center totank
support if it was removed. Install cover (item 1) and heat
shield (item 11) to power center.
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.
9.
nect negative (--) cable to battery (see Battery Service
in the Service and Repairs section of this chapter).
Connect positive (+) cable to battery and then con-
The glow relay is used to provide current to the engine
glow plugs when the relay is energized by the
TEC--5002controller.TheTEC--5002controlsandmon-
itors the operation of the glow relay.
10.Lower
3
and secure hood.
1
The cab power relay on Groundsmaster 4110--D ma-
chines is used to provide current to the operator cab
electrical components. When the ignition switch is inthe
ONorSTARTposition,thecabpowerrelayisenergized.
12
11
2
Testing
5
1.
stop engine, engage parking brake and remove key
from the ignition switch. Raise and support hood.
Park machine on a level surface, lower cutting deck,
6
7
2.
To make sure that machine operation does notoccur
8
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).
RIGHT
10
FRONT
9
4
Figure 34
3.
Removecover(item1)andheatshield(item11)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.
1.
2.
3.
4.
5.
6.
Cover
7.
8.
9.
10. Cab power relay
11. Heat shield
12. Screw (2 used)
Lock nut
Main power relay
Glow relay
Screw
Flange nut (2 used)
Carriage screw (2 used)
Screw
4.
Disconnect wire harness connector from relay. Re-
Mount
move relay from mounting bracket for 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
86
85
87
30
30
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.
85
86
8
7
5.
tween terminals 86 and 85 is approximately 72 ohms.
Using a multimeter, verify that coil resistance be-
Figure 35
6.
Connectmultimeter (ohmssetting) leadstorelayter-
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.
Electrical System
Page 5 -- 30
Groundsmaster 4100--D/4110--D
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