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Groundsmaster 5900/5910Page 5 -- 62Electrical System
Up Limit Switches
The cutting deck up limit switches are normally open
proximity switches that are attached to brackets located
on the traction unit frame (Fig. 113). The sensing plates
used for the switches are located on the cutting deck lift
arms.
When a cutting deck is in the lowered position, the sens-
ing plate will be near the up limit switch and the switch
will be closed. This closed switch is used as an input for
the controller to provide current flow to the cutting deck
hydraulic solenoid valve when the PTO is engaged, al-
lowing the cutting deck to operate.
When a cutting deck is raised, the sensing plate is
moved away from the up limit switch and the switch
opens. This open switch is used as an input for the con-
troller to prevent current flow to the cutting deck hydrau-
lic solenoid valve, preventing the cutting deck from
operating.
Switch Testing
NOTE: Operation of a up limit switch and its circuit wir-
ing should be monitored with the Info Center before dis-
connecting the switch for testing (see Info Center
Display in the Troubleshooting section of this chapter).
If the Info Center Display verifies that the up limit switch
andcircuitwiring arefunctioningcorrectly,switch testing
is not necessary.
1. Verifywith the Info Center Display thatthe deck posi-
tion switch andcircuit wiring arenot functioning correct-
ly.
2. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
3. Disconnect up limit switch that requires testing from
machine wire harness.
4. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the switch connector
terminals.
5. With the cutting unit in the lowered position, there
should be continuity (zero resistance) across the
switch terminals.
6. Raise the cutting unit. There should be no continu-
ity (infinite resistance) across the switch terminals.
7. Replace switch as needed. Reconnect switch to ma-
chine wire harness.
Switch Adjustment
1. Adjust up limit switch to have from 0.070” to 0.130”
(1.8 to 3.3 mm) clearance between switch and sensing
plate on the lift arm.
1. Up limit switch (LH shown)
2. Sensing plate
Figure 113
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2