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Groundsmaster 4500--D/4700--DPage 5 -- 32Electrical System
Traction Neutral Switch
The traction neutral switch is closed when the traction
pedalisintheneutralpositionandopenswhenthepedal
is depressedin either direction.The switchis located on
the right side of the piston (traction) pump (Fig. 46).
Testing
Before disconnectingthe tractionneutral switch for test-
ing, the switch and its circuit wiring should be tested as
a TECinput with theDiagnostic Display (seeDiagnostic
Display in the Troubleshooting section of this chapter).
If the Diagnostic Display verifies that neutral switch and
circuit wiring are functioning correctly, no further switch
testingisnecessary.If,however,theDisplaydetermines
that neutral switch and circuit wiring are not functioning
correctly, proceed with test.
To test the traction neutral switch, make sure that the
ignition switch is in the OFF position and the key is re-
moved from the switch. Disconnect the wire harness
connector from the neutral switch and connect a multi-
meter across the two (2) switch terminals. With the en-
gine turned off, slowly push the traction pedal in a
forwardor reversedirection whilewatching themultime-
ter. There should be indications that the traction neutral
switch is opening and closing. Allow the traction pedal
to return to the neutral position. There should be conti-
nuity across the switch terminals when thetraction ped-
al is in the neutral position.
See Piston Pump Control Assembly in Chapter 4 -- Hy-
draulic Systems for disassembly and assembly proce-
dures for the neutral switch.
1. Piston (traction) pump 2. Neutral switch
Figure 46
2
1
Diode Assembly
The engine wire harness contains a diode that is used
for circuit protection from voltage spikes when the en-
gine starter solenoid is de--energized. The diode plugs
into the wiring harness near the starter motor (see En-
gine Wire Harness D rawing in Chapter 9 -- Foldout
Drawings).
Diode Test
The diode (Fig. 47) can be individually tested using a
digital multimeter (diode test or ohms setting) and the
table to the right.
Figure 47
1. Diode
2. Male terminal
3. Female terminal
2
1
3
Multimeter
Red Lead (+)
on Terminal
Multimeter
Black Lead (--)
on Terminal
Continuity
Female Male YES
Male Female NO