Traction Neutral Switch; Diode Assembly - Toro Groundsmaster 4100-D Service Manual

Traction Neutral Switch

The traction neutral switch is closed when the traction
pedal is in the neutral position and opens when the pedal
is depressed in either direction (forward or reverse). 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).
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
Diagnostic Display in the Troubleshooting section of this
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 that the neutral switch and circuit wiring
are not functioning correctly, proceed with test.
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). Allow the traction pedal to return to the neutral
position. There should be continuity (low resistance)
across the switch terminals when the traction pedal is in
the neutral position.

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. The diode plugs into the wire harness near the en-
gine starter motor (see Engine Wire Harness Drawing in
Chapter 10 -- Foldout Drawings).
Testing
The diode can be tested using a digital multimeter
(diode test or ohms setting) and the chart to the right.
Groundsmaster 4100--D/4110--D
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.
1
1. Piston pump (bottom)
1
1. Diode
2. Male terminal
Multimeter
Red Lead (+)
on Terminal
Female
Male
Page 5 - - 41
2
Figure 53
2. Neutral switch
Figure 54
3. Female terminal
Multimeter
Black Lead (- -) Continuity
on Terminal
Male YES
Female NO
Electrical System
2
3