Toro 08161SL Service Manual Model 30412 Groundsmaster 4000 D Preface Publication

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 (Fig. 46).
Testing
2
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.
1
Figure 46
2.
1.
Piston pump (bottom)
Neutral switch
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 neutral switch.
Diode Assemblies
The Groundsmaster 4000--D electrical system includes
several diode assemblies (Fig. 47) that are used for cir-
cuit protection and circuit logic control. The diodes plug
into the wiring harness at various locations on the ma-
chine.
2
The diodes  D2,  D4, D5  and D6  are used  for  circuit
protectionfrominductivevoltagespikesthatoccurwhen
a hydraulic valve solenoid is de--energized. Diode D2 is
intheTransport/Mowcircuit,D4isin    theleftcutting  deck
circuit, D5 is in the front cutting deck circuit and D6 is in
the right cutting deck circuit.
3
1
Figure 47
1.
2.
Diode
Male terminal
3.
Female terminal
Diode D9 provides logic for the high temperature warn-
ing system.
If the machine is equipped with the optional cruise con-
trol kit, two (2) additional diodes are used. Diode D7 in
thiskitisused  forcircuit protection that occur when ahy-
draulic valve solenoid is de--energized. Diode D8  pro-
vides  a   latching  circuit   to  keep   the  cruise   relay
energized.
Multimeter
Red Lead (+)
on Terminal
Multimeter
Black Lead (--)
on Terminal
Continuity
Female
Male
Male
YES
NO
Female
Testing
The diodes  can be  individually tested  using a  digital
multimeter (diode test or ohms setting) and the table to
the right.
Groundsmaster 4000--D
Page 5 -- 29
Electrical System
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
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- 298 pages
Document TypeCatalog
LanguageEnglish
Product BrandToro. Customer Service Representatives are available by phone: Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
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