Air Conditioning Relay (Groundsmaster 5910)
A relay is used to control the air conditioning electrical
power circuit on the Groundsmaster 5910. When ener-
gized by the air conditioning switch, the relay provides
current for the air conditioning components. The relay is
attached to the cab headliner above the switch panel.
86
87A
87
Testing
1.
Make sure ignition switch is OFF. Remove key from
85
30
ignition switch.
2.
Remove screws that secure switch panel to headlin-
Figure 95
er in cab. Locate relay and disconnect the machine wire
harnessconnectorfromtherelay.Removerelayforeas-
ier 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 the measured value for the tested component.
3.
sistance between terminals 85 and 86 (Fig. 95). Resist-
ance should be between 70 and 90 ohms.
Using a multimeter (ohms setting), measure coil re-
4.
Connectmultimeter (ohmssetting) leadstorelayter-
minals 30 and 87. Ground terminal 86 and apply +12
VDCtoterminal85.Therelayshouldhavecontinuitybe-
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.
5.
Disconnect voltage and multimeter leads from the
relay terminals.
6.
Connectmultimeter (ohmssetting) leadstorelayter-
minals 30 and 87A. Ground terminal 86 and apply +12
VDCtoterminal85.Therelayshouldnothavecontinuity
between terminals 30 and 87A as +12 VDC is applied to
terminal 85. The relay should have continuity between
terminals 30 and 87A as +12 VDC is removed from ter-
minal 85.
7.
Disconnect voltage and multimeter leads from the
relay terminals.
8.
Secure relay to machine and connect machine wire
harness connector to relay.
Groundsmaster 5900/5910
Page 5 -- 53
Electrical System
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