Traction Neutral Switch
The traction neutral switch is closed when the traction
pedalisintheneutralpositionandopenswhenthepedal
isdepressedineitherdirection(forwardorreverse).The
neutral switch is used as an input to the TEC--5002 con-
troller. The switch is located on the right side of the pis-
ton (traction) pump (Fig. 53).
See the Eaton Model 72400 Servo Controlled Piston
Pump Repair Information at the end of Chapter 4 -- Hy-
draulic System for disassembly and assembly proce-
dures for the traction neutral switch.
Testing
Before disconnecting the traction neutral switch for test-
ing, the switch and its circuit wiring should be tested as
a TEC--5002 input with the Diagnostic Display (see
DiagnosticDisplayintheTroubleshootingsectionofthis
chapter). If the Diagnostic Display verifies that the neu-
tral switch and circuit wiring are functioning correctly,no
further switch testing is necessary. If, however, the Dis-
play determines thattheneutral switch and circuitwiring
are not functioning correctly, proceed with test.
2
1
Test the neutral switch by disconnecting the wires from
the switch terminals and connecting a multimeter (set to
ohms) across the two (2) switch terminals. With the en-
gine turned off, slowly push the traction pedal in a for-
ward or reverse direction while watching the multimeter.
There should be indications that the traction neutral
switch is opening (high resistance) and closing (low re-
sistance).Allowthetractionpedaltoreturntotheneutral
position. There should be continuity (low resistance)
across the switch terminals when the traction pedal is in
the neutral position.
Figure 53
1.
Piston pump (bottom)
2.
Neutral switch
Diode Assembly
The Groundsmaster engine wire harness contains a
diode that is used for circuit protection from voltage
spikes when the engine starter solenoid is de--ener-
gized.Thediodeplugsintothewireharnessneartheen-
ginestarter motor (seeEngine WireHarness Drawing in
Chapter 10 -- Foldout Drawings).
2
Testing
3
1
The diode can be tested using a digital multimeter
(diode test or ohms setting) and the chart to the right.
Figure 54
1.
2.
Diode
Male terminal
3.
Female terminal
Multimeter
Red Lead (+)
on Terminal
Multimeter
Black Lead (--)
on Terminal
Continuity
Female
Male
Male
YES
NO
Female
Groundsmaster 4100--D/4110--D
Page 5 -- 41
Electrical System
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