Start and Air Conditioning (Groundsmaster 4110--D) Relays
When energized by the TEC--5002 controller, the start
relay is used to provide current to the engine starter mo-
tor solenoid. The TEC--5002 controls and monitors the
operation of the start relay. The start relay is located at
the power center behind the operator seat (Fig. 36).
minal 85. The relay terminals 30 and 87A should have
continuity as +12 VDC is removed from terminal 85.
9.
Disconnect voltage and multimeter test leads from
the relay terminals. Replace relay if necessary.
10.Secure
relay to mounting bracket and connect wire
An identical relay is used to control the air conditioning
electrical power circuit on the Groundsmaster 4110--D.
When energized by theair conditioning switch, therelay
provides current for the air conditioning components.
The relay is attached to the evaporator assembly in the
cab headliner.
harness connector torelay.Secure power center totank
support if it was removed. Install cover (item 1) and heat
shield (item 9) to power center.
11.
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).
Testing
12.Lower
3
and secure hood.
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,
1
2.
To make sure that machine operation does notoccur
10
9
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).
2
5
3.
Remove cover (item 1) and heat shield (item 9) 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.
6
RIGHT
8
4.
Disconnect wire harness connector from relay. Re-
move relay from mounting bracket for testing.
FRONT
7
4
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
Figure 36
1.
2.
3.
4.
5.
Cover
6.
7.
8.
Mount
0.5
ohms or less). This resistance is due to the internal
Screw
Lock nut
resistance of the meter and test leads. Subtract this val-
ue from from the measured value of the component you
are testing.
Flange nut (2 used)
Carriage screw (2 used)
Screw
Start relay
Heat shield
9.
10. Screw (2 used)
5.
tween terminals 85 and 86 is from 71 to 88 ohms.
Using a multimeter, verify that coil resistance be-
3
4
1
6.
Connectmultimeter (ohmssetting) leadstorelayter-
86
85
87A
87
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay terminals 30 and 87
shouldhavecontinuityas+12VDCisappliedtoterminal
85.
nuity as +12 VDC is removed from terminal 85.
The relay terminals 30 and 87 should not have conti-
30
7.
lead from terminal 87.
Disconnect voltage from terminal 85 and multimeter
2
1
Figure 37
8.
Connectmultimeter (ohmssetting) leadstorelayter-
minals 30 and 87A. With terminal 86 grounded, apply
VDC to terminal 85. The relay terminals 30 and 87A
should not have continuity as +12 VDC is applied to ter-
Groundsmaster 4100--D/4110--D Page 5 -- 31
1.
2.
Coil terminal
Common terminal
3.
4.
Normally closed term.
Normally open term.
+12
Electrical System
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| Tags | Toro Groundsmaster 10177SL, Toro Groundsmaster 30447, Toro Groundsmaster 30449, Toro Groundsmaster 4100, Toro Groundsmaster 4110 D |
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