Traction Neutral Switch
The traction neutral switch is closed when the traction
pedalisintheneutralpositionandopenswhenthepedal
is depressed in either direction. The switch is located on
the right side of the piston (traction) pump.
1
Test the switch by disconnecting the wires from the
switch terminals and connecting a continuity tester
across the two switch terminals. With the engine turned
off,slowly pushthetraction pedalinaforward orreverse
direction while watching the continuity tester. 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 continuity
across the switch terminals when the traction pedal is in
the neutral position.
2
Figure 38
1.
Piston (traction) pump
2.
Neutral switch
See Piston Pump Control Assembly in Chapter 4 -- Hy-
draulicSystemsfordisassemblyandreassemblyproce-
dures for the neutral switch.
Diode Assemblies
DiodeD8providelogicfortheinterlockswitches.Diodes
D2, D3, D4 (GM 4700--D only), and D5 (GM 4700--D
only) are used for circuit protection from voltage spikes
whenrelays andhydraulic valve solenoids arede--ener-
gized.Thediodesplugintothewiringharness atvarious
locations (see Wire Harness Drawings in Chapter 9 --
Electrical Diagrams).
2
3
Diode Test
1
The diodes (Fig. 39) can be individually tested using a
digital multimeter (diode test or ohms setting) and the
table to the right.
Figure 39
3.
1.
2.
Diode
Male terminal
Female terminal
Multimeter
Red Lead (+)
on Terminal
Multimeter
Black Lead (--)
on Terminal
Continuity
Female
Male
Male
YES
NO
Female
Electrical System (Rev. A)
Page 5 -- 24
Groundsmaster 4500--D/4700--D
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