Toro Workman MDE 2008 User manual

Part No. 08164SL (Rev. A)
Service Manual
WorkmanRMDE
Preface
The purpose of this publication is to provide the service
technician with information for troubleshooting, testing
and repair of major systems and components on the
Workman MDE.
REFER TO THE OPERATOR’S MANUAL FOR OPER-
ATING, MAINTENANCE AND ADJUSTMENT IN-
STRUCTIONS. For reference, insert a copy of the
Operator’s Manual and Parts Catalog for your machine
into Chapter 2 of this service manual. Additional copies
of the Operator’s Manual and Parts Catalog are avail-
able on the internet at www.Toro.com.
TheToroCompanyreservestherightto changeproduct
specifications or this publication without notice.
This safety symbol means DANGER, WARNING
or CAUTION, PERSONAL SAFETY INSTRUC-
TION. When you see this symbol, carefully read
the instructions that follow. Failure to obey the
instructions may result in personal injury.
NOTE: ANOTE will give general information about the
correct operation, maintenance, service, testing or re-
pair of the machine.
IMPORTANT: The IMPORTANT notice will give im-
portantinstructionswhichmustbefollowedtopre-
vent damage to systems or components on the
machine.
EThe Toro Company -- 2008, 2011

Workman MDE
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Workman MDE
Table Of Contents
Chapter 1 -- Safety
Safety Instructions 1 -- 2..........................
Jacking and Other Instructions 1 -- 4...............
Safety and Instruction Decals 1 -- 5................
Chapter 2 -- Product Records and Maintenance
Product Records 2 -- 1...........................
Maintenance 2 -- 1...............................
Equivalents and Conversions 2 -- 2................
Torque Specifications 2 -- 3.......................
Chapter 3 -- Electrical System
General Information 3 -- 2........................
Electrical Diagrams 3 -- 3.........................
Vehicle Operation 3 -- 4..........................
Special Tools 3 -- 5..............................
Troubleshooting 3 -- 8............................
Adjustments 3 -- 11..............................
Component Testing 3 -- 14........................
Service and Repairs 3 -- 28.......................
LESTER ELECTRICAL TECHNICIAN
SERVICE GUIDE
Chapter 4 -- Transaxle and Brakes
General Information 4 -- 2........................
Specifications 4 -- 3..............................
Troubleshooting 4 -- 4............................
Service and Repairs 4 -- 6........................
SPICER OFF--HIGHWAY COMPONENTS MODEL
12 (ELECTRIC) MAINTENANCE MANUAL
Chapter 5 -- Chassis
General Information 5 -- 1........................
Specifications 5 -- 2..............................
Troubleshooting 5 -- 3............................
Service and Repairs 5 -- 5........................
Chapter 6 -- Electrical Diagrams
Electrical Schematic 6 -- 3........................
Electrical Circuit Drawings 6 -- 4...................
Electrical Harness Drawings 6 -- 8.................
SafetyProduct Records
and Maintenance
ElectricalChassisElectrical
Diagrams Transaxle and SystemBrakes
Rev. A

Workman MDE
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Workman MDE Page 1 -- 1 Safety
Chapter 1
Safety
Table of Contents
SAFETY INSTRUCTIONS 2......................
Before Operating 2............................
While Operating 2.............................
Maintenance and Service 3....................
JACKING AND OTHER INSTRUCTIONS 4.........
Jacking Vehicle 4.............................
Towing Vehicle 4..............................
Transporting Vehicle 4.........................
SAFETY AND INSTRUCTION DECALS 5..........
Safety

Workman MDEPage 1 -- 2Safety
Safety Instructions
The WorkmanMDE is designed and testedto offer safe
service when operated and maintained properly. Al-
though hazard control and accident prevention are par-
tially dependent upon the design and configuration of
themachine,thesefactorsarealsodependentuponthe
awareness, concern and proper training of the person-
nel involved in the operation, transport, maintenance
and storage of the machine. Improper use or mainte-
nanceofthemachinecanresultininjuryordeath.Tore-
duce the potential for injury or death, comply with the
following safety instructions.
WARNING
To reduce the potential for injury or death,
comply with the following safety instructions.
Before Operating
1. Review and understand the contents of the Opera-
tor’s Manual and Operator’s DVD before starting and
operatingthevehicle.Becomefamiliar with thecontrols
and know how to stop the vehicle and engine quickly.
AdditionalcopiesoftheOperator’sManualareavailable
on the internet at www.Toro.com.
2. Keep all shields,safety devices and decals in place.
Ifashield,safetydeviceordecalisdefective,illegibleor
damaged, repair or replace it before operating the ma-
chine.Alsotightenanyloosenuts,boltsorscrewstoen-
sure machine is in safe operating condition.
While Operating
WARNING
The Workman MDE is an off--highway vehicle
only. It is not designed, equipped or manufac-
tured for use on public streets, roads or high-
ways.
1. Sit on the operator seat whenstarting and operating
the vehicle.
2. Before starting the vehicle:
A. Make sure that the battery charger is discon-
nected from the vehicle charger receptacle.
B. Engage the parking brake.
C. Make sure accelerator pedal is not depressed.
D. Check position of forward/reverse switch and Hi/
Low speed switch.
3. Before getting off the operator seat:
A. Stop vehicle, turn on/offswitch OFF and remove
key from switch.
B. Apply the parking brake.
4. If vehicle is parked on incline, chock or block the
wheels after getting off the vehicle.

Workman MDE Page 1 -- 3 Safety
Maintenance and Service
1. Before servicing or making adjustments to the ve-
hicle, stop vehicle, turn on/off switch to OFF, engage
parking brake and remove key from the on/off switch.
2. Make sure machine is in safeoperating condition by
keeping all nuts, bolts and screws tight.
3. Do not use open pans of flammable cleaning fluids
for cleaning parts.
4. Keep battery area free of excessive grease, grass,
leaves and dirt.
5. Disconnect batteries before servicing the machine.
Carefullyremoveoneofthebattery cablesfromthebat-
tery pack as the first step in any repair. Once a battery
cable has been removed, the electrical system on the
vehicle can be safely worked on. Take care during re-
pairs,however,tonotallowtoolsorvehiclecomponents
to complete the battery circuit that was opened with the
cable removal. Reattach the removed cable to the bat-
tery pack as the last step in any repair.
6. When using metal, uninsulated tools around batter-
ies,donotallowtoolstocontactbothpositiveandnega-
tive battery terminals simultaneously.
7. Remove jewelry and watches before servicing elec-
trical components of the vehicle.
8. Battery acid is poisonous and can cause burns.
Avoid contact with skin, eyes and clothing. Protect your
face, eyes and clothing when working with batteries.
9. Battery gases can explode. Keep cigarettes, sparks
and flames away from the batteries. Always service,
storeandchargethevehiclebatteriesinawellventilated
area.
10.Never use an open flame to check level or leakage
of battery electrolyte.
11.When connecting the battery charger to the vehicle,
connect the charger cord to the vehicle charger recep-
tacle before plugging the charger power cord into an
outlet. After charging the vehicle batteries, unplug the
chargerpowercordfromtheoutletbeforedisconnecting
the charger cord from the vehicle charger receptacle.
12.If major repairsareever needed orassistanceis de-
sired, contact an Authorized Toro Distributor.
13.To assure optimum performance and continued
safety of the machine, use genuine Toro replacement
parts and accessories. Replacement parts and acces-
sories made by other manufacturers may result in non-
conformance with safety standards and the warranty
may be voided.
14.When raising the machine to change tires or to per-
formotherservice,usecorrectblocks,hoistsandjacks.
Make sure machine is parked on a solid level surface
suchasaconcretefloor.Priortoraisingthemachine,re-
move any attachments that may interfere with the safe
and proper raising of the machine. Always chock or
blockwheels.Usejackstandstosupporttheraisedma-
chine. If the machine is not properly supported by jack
stands, the machine may move or fall,which may result
inpersonalinjury(seeJackingInstructionsintheOpera-
tor’s Manual and in this Chapter).
Safety

Workman MDEPage 1 -- 4Safety
Jacking and Other Instructions
Jacking Vehicle
DANGER
POTENTIAL HAZARD
•A vehicle that is not properly supported
may become unstable.
WHAT CAN HAPPEN
•The vehicle may move or fall. Personal
injury or damage to the machine may result.
HOW TO AVOID THE HAZARD
•Make sure vehicle is parked on a solid level
surface, such as a concrete floor.
•Make sure on/off switch is OFF and key is
removed from the switch before getting off
the vehicle.
•Before raising the vehicle, remove any
attachments that may interfere with the safe
and proper raising of the vehicle.
•Always chock or block wheels to prevent
the vehicle from rolling.
•Make sure proper hoists and jack stands
are used to raise and support the vehicle.
Jacking Locations
1. Jack front of the vehicle on the front of the frame be-
hind the towing tongue (Fig. 1).
2. Jackrearofthevehicleundereachrearaxletube.Do
not jack vehicle below the transaxle case (Fig. 2).
1. Front frame 2. Towing tongue
Figure 1
12
1. Rear axle tube 2. Transaxle case
Figure 2
121
Towing Vehicle
IMPORTANT: Frequent or long distance towing of
the Workman MDE is not recommended.
In case of emergency, the vehicle can be towed for a
short distance. See Operator’s Manual for towing in-
formation.
IMPORTANT: If vehicle is towed, make sure that on/
off switch is in the OFF position andkey is removed
from switch.
Transporting Vehicle
Whenmovingthevehiclelongdistances,useatraileror
flatbed truck. Make sure vehicle is secured to the trailer
properly. See Operator’s Manual for transport informa-
tion.

Workman MDE Page 1 -- 5 Safety
Safety and Instruction Decals
Thereareseveralsafetyandinstructiondecalsattached
toyourWorkmanvehicle.Ifanydecal becomesillegible
ordamaged,installanewdecal.Partnumbersarelisted
in the Parts Catalog. Order replacement decals from
your Authorized Toro Distributor.
Safety

Workman MDEPage 1 -- 6Safety
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Workman MDE Page 2 -- 1 Product Records and Maintenance
Chapter 2
Product Records and Maintenance
Table of Contents
PRODUCT RECORDS 1.........................
MAINTENANCE 1...............................
EQUIVALENTS AND CONVERSIONS 2...........
Decimal and Millimeter Equivalents 2............
U.S. to Metric Conversions 2...................
TORQUE SPECIFICATIONS 3....................
Fastener Identification 3.......................
Standard Torque for Dry, Zinc Plated and
Steel Fasteners (Inch Series) 4...............
Standard Torque for Dry, Zinc Plated and
Steel Fasteners (Metric Fasteners) 5...........
Other Torque Specifications 6..................
Conversion Factors 6..........................
Product Records
Insert Operator’s Manual and Parts Catalog for your
Workmanvehicleattheendofthischapter.Additionally,
if any optional equipment or accessories have been
installed to your Workman, insert the Installation In-
structions, Operator’s Manuals and Parts Catalogs for
those options at the end of this chapter.
Maintenance
Maintenanceproceduresandrecommendedservicein-
tervalsfortheWorkmanMDEarecoveredintheOpera-
tor’s Manual. Refer to that publication when performing
regular vehicle maintenance.
Product Records
and Maintenance

0.09375
Workman MDEPage 2 -- 2Product Records and Maintenance
Equivalents and Conversions

Workman MDE Page 2 -- 3 Product Records and Maintenance
Torque Specifications
Recommended fastener torque values are listed in the
followingtables.Forcriticalapplications,asdetermined
byToro,eithertherecommendedtorqueoratorquethat
is unique to the application is clearly identified and spe-
cified in this Service Manual.
These Torque Specifications for the installation and
tightening of fasteners shall apply toall fasteners which
donothave aspecificrequirementidentifiedinthis Ser-
vice Manual. The following factors shall be considered
when applying torque: cleanliness of the fastener, use
of a thread sealant (e.g. Loctite), degree of lubrication
on the fastener, presence of a prevailing torque feature
(e.g. Nylock nut), hardness of the surface underneath
thefastener’sheadorsimilarconditionwhichaffectsthe
installation.
Asnotedinthefollowingtables,torquevaluesshouldbe
reduced by 25% for lubricated fasteners to achieve
the similar stress as a dry fastener. Torque values may
also have to be reduced when the fastener is threaded
into aluminum or brass. The specific torque value
should be determined based on the aluminum or brass
material strength, fastener size, length of thread en-
gagement, etc.
The standard method of verifying torque shall be per-
formed by marking a line on the fastener (head or nut)
and mating part, then back off fastener 1/4 of a turn.
Measurethetorquerequiredtotightenthefasteneruntil
the lines match up.
Fastener Identification
Figure 1
Grade 1 Grade 5 Grade 8
Inch Series Bolts and Screws Figure 2
Class 8.8 Class 10.9
Metric Bolts and Screws
Product Records
and Maintenance

Rev. A Workman MDEPage 2 -- 4Product Records and Maintenance
Standard Torque for Dry, Zinc Plated and Steel Fasteners (Inch Series)
Thread Size Grade 1, 5 &
8withThin
Height Nuts
SAE Grade 1 Bolts, Screws, Studs &
Sems with Regular Height Nuts
(SAE J995 Grade 2 or Stronger Nuts)
SAE Grade 5 Bolts, Screws, Studs &
Sems with Regular Height Nuts
(SAE J995 Grade 2 or Stronger Nuts)
SAE Grade 8 Bolts, Screws, Studs &
Sems with Regular Height Nuts
(SAE J995 Grade 5 or Stronger Nuts)
in--lb in--lb N--cm in--lb N--cm in--lb N--cm
# 6 -- 32 UNC
1
0
+
2
1
3
+
2
1
4
7
+
2
3
15 + 2169 + 23 23 + 3262 + 34
# 6 -- 40 UNF 10 + 213 + 2147 + 23 17 + 2192 + 23 25 + 3282 + 34
# 8 -- 32 UNC
1
3
+
2
2
5
+
5
2
8
2
+
3
0
29 + 3328 + 34 41 + 5463 + 56
# 8 -- 36 UNF 13 + 225 + 5282 + 30 31 + 4350 + 45 43 + 5486 + 56
#10--24UNC
1
8
+
2
3
0
+
5
3
3
9
+
5
6
42 + 5475 + 56 60 + 6678 + 68
#10--32UNF 18 + 230 + 5339 + 56 48 + 5542 + 56 68 + 7768 + 79
1/4 -- 20 UNC 48 + 753 + 7599 + 79 100 + 10 1130 + 113 140 + 15 1582 + 169
1/4 -- 28 UNF 53 + 765 + 10 734 + 113 115 + 12 1299 + 136 160 + 17 1808 + 192
5/16 -- 18 UNC 115 + 15 105 + 15 1186 + 169 200 + 25 2260 + 282 300 + 30 3390 + 339
5/16 -- 24 UNF 138 + 17 128 + 17 1446 + 192 225 + 25 2542 + 282 325 + 33 3672 + 373
ft--lb ft--lb N--m ft--lb N--m ft--lb N--m
3/8 -- 16 UNC 16 + 216 + 222 + 330 + 341 + 443 + 558 + 7
3/8 -- 24 UNF 17 + 218 + 224 + 335 + 447 + 550 + 668 + 8
7/16 -- 14 UNC 27 + 327 + 337 + 450 + 568 + 770 + 795 + 9
7/16 -- 20 UNF 29 + 329 + 339 + 455 + 675 + 877 + 8104 + 11
1/2 -- 13 UNC 30 + 348 + 765 + 975 + 8102 + 11 105 + 11 142 + 15
1/2 -- 20 UNF 32 + 453 + 772 + 985 + 9115 + 12 120 + 12 163 + 16
5/8 -- 11 UNC 65 + 10 88 + 12 119 + 16 150 + 15 203 + 20 210 + 21 285 + 28
5/8 -- 18 UNF 75 + 10 95 + 15 129 + 20 170 + 18 230 + 24 240 + 24 325 + 33
3/4 -- 10 UNC 93 + 12 140 + 20 190 + 27 265 + 27 359 + 37 375 + 38 508 + 52
3/4 -- 16 UNF 115 + 15 165 + 25 224 + 34 300 + 30 407 + 41 420 + 43 569 + 58
7/8 -- 9 UNC 140 + 20 225 + 25 305 + 34 430 + 45 583 + 61 600 + 60 813 + 81
7/8 -- 14 UNF 155 + 25 260 + 30 353 + 41 475 + 48 644 + 65 667 + 66 904 + 89
NOTE: Reduce torque values listed in the table above
by 25% for lubricated fasteners. Lubricated fasteners
are defined as threads coated with a lubricant such as
engine oil or thread sealant such as Loctite.
NOTE: Torque values may have to be reduced when
installing fasteners into threaded aluminum or brass.
The specific torque value should be determined based
on the fastener size, the aluminum or base material
strength, length of thread engagement, etc.
NOTE: The nominal torque values listed above for
Grade 5 and 8 fasteners are based on 75% of the mini-
mumproof load specifiedin SAEJ429.The toleranceis
approximately + 10% of the nominal torque value. Thin
height nuts include jam nuts.

Workman MDE Page 2 -- 5 Product Records and Maintenance
Standard Torque for Dry, Zinc Plated and Steel Fasteners (Metric Series)
T
h
r
e
a
d
S
i
z
e
Class 8.8 Bolts, Screws and Studs with
R
e
g
u
l
a
r
H
e
i
g
h
t
N
u
t
s
Class 10.9 Bolts, Screws and Studs with
R
e
g
u
l
a
r
H
e
i
g
h
t
N
u
t
s
Thread Size Regular Height Nuts
(Class 8 or Stronger Nuts) Regular Height Nuts (Class 10 or Stronger Nuts)
M5 X 0.8 57 + 6in--lb 644 + 68 N--cm 78 + 8in--lb 881 + 90 N--cm
M6 X 1.0 96 + 10 in--lb 1085 + 113 N--cm 133 + 14 in--lb 1503 + 158 N--cm
M8 X 1.25 19 + 2ft--lb 26 + 3N--m 28 + 3ft--lb 38 + 4N--m
M10 X 1.5 38 + 4ft--lb 52 + 5N--m 54 + 6ft--lb 73 + 8N--m
M12 X 1.75 66 + 7ft--lb 90 + 10 N--m 93+ 10 ft--lb 126 + 14 N--m
M16 X 2.0 166 + 17 ft--lb 225 + 23 N--m 229 + 23 ft--lb 310 + 31 N--m
M20 X 2.5 325 + 33 ft--lb 440 + 45 N--m 450 + 46 ft--lb 610 + 62 N--m
NOTE: Reduce torque values listed in the table above
by 25% for lubricated fasteners. Lubricated fasteners
are defined as threads coated with a lubricant such as
engine oil or thread sealant such as Loctite.
NOTE: Torque values may have to be reduced when
installing fasteners into threaded aluminum or brass.
The specific torque value should be determined based
on the fastener size, the aluminum or base material
strength, length of thread engagement, etc.
NOTE: The nominal torque values listed above are
based on 75% of the minimum proof load specified in
SAEJ1199.Thetoleranceisapproximately+10%ofthe
nominal torque value.
Product Records
and Maintenance

Workman MDEPage 2 -- 6Product Records and Maintenance
Other Torque Specifications
SAE Grade 8 Steel Set Screws
T
h
r
e
a
d
S
i
z
e
Recommended Torque
Thread Size Square Head Hex Socket
1/4 -- 20 UNC 140 + 20 in--lb 73 + 12 in--lb
5/16 -- 18 UNC 215 + 35 in--lb 145 + 20 in--lb
3/8 -- 16 UNC 35 + 10 ft--lb 18 + 3ft--lb
1/2 -- 13 UNC 75 + 15 ft--lb 50 + 10 ft--lb
Thread Cutting Screws
(Zinc Plated Steel)
Type 1, Type 23 or Type F
Thread Size Baseline Torque*
No. 6 -- 32 UNC 20 + 5in--lb
No. 8 -- 32 UNC 30 + 5in--lb
No. 10 -- 24 UNC 38 + 7in--lb
1/4 -- 20 UNC 85 + 15 in--lb
5/16 -- 18 UNC 110 + 20 in--lb
3/8 -- 16 UNC 200 + 100 in--lb
Wheel Bolts and Lug Nuts
Thread Size Recommended Torque**
7/16 -- 20 UNF
Grade 5 65 + 10 ft--lb 88 + 14 N--m
1/2 -- 20 UNF
Grade 5 80 + 10 ft--lb 108 + 14 N--m
M12 X 1.25
Class 8.8 80 + 10 ft--lb 108 + 14 N--m
M12 X 1.5
Class 8.8 80 + 10 ft--lb 108 + 14 N--m
** For steel wheels and non--lubricated fasteners.
Thread Cutting Screws
(Zinc Plated Steel)
Thread
S
i
z
e
Threads per Inch
B
a
s
e
l
i
n
e
T
o
r
q
u
e
*
Size Type A Type B Baseline Torque
*
No. 6 18 20 20 + 5in--lb
No. 8 15 18 30 + 5in--lb
No. 10 12 16 38 + 7in--lb
No. 12 11 14 85 + 15 in--lb
*Holesize,materialstrength,materialthicknessandfin-
ish must be considered when determining specific
torquevalues.Alltorquevaluesarebasedonnon--lubri-
cated fasteners.
Conversion Factors
in--lb X 11.2985 = N--cm N--cm X 0.08851 = in--lb
ft--lb X 1.3558 = N--m N--m X 0.7376 = ft--lb

Rev. A
Workman MDE Page 3 -- 1 Electrical System
Chapter 3
Electrical System
Table of Contents
GENERAL INFORMATION 2.....................
Operator’s Manual 2..........................
Opening Battery Circuit 2......................
ELECTRICAL DIAGRAMS 3......................
VEHICLE OPERATION 4........................
SPECIAL TOOLS 5.............................
TROUBLESHOOTING 8.........................
General Run Problems 8.......................
Battery Charger Operation 9....................
Battery Charger Problems 10...................
ADJUSTMENTS 11.............................
Accelerator Switch Adjustment 11...............
Accelerator Potentiometer Adjustment
(Potentiometer with Short Lever) 12............
Accelerator Potentiometer Adjustment
(Potentiometer with Long Lever) 12.1..........
Accelerator System Calibration 13...............
COMPONENT TESTING 14......................
On/Off Switch 14..............................
Battery Discharge Indicator and Hour
Meter Gauge 15.............................
Vehicle Direction (Forward/Reverse) and
Headlight Switches 16.......................
Vehicle Status Light 17........................
Supervisor Speed Limit Switch 18...............
Audio Alarm (Reverse) 18......................
Charger Interlock Switch 19....................
Main and Accessories Contactors 20............
Fuses 22....................................
Fusible Links 23..............................
Accelerator Switch 24.........................
Accelerator Potentiometer 25...................
Controller 26.................................
SERVICE AND REPAIRS 28.....................
Battery Service 28............................
Battery Specifications 28.....................
Battery Removal 29..........................
Battery Installation 29........................
Battery Charging 30..........................
Battery Inspection and Maintenance 30.........
Battery Testing 31...........................
Battery Storage 32...........................
Traction Motor Brushes 33.....................
Traction Motor 34.............................
Traction Motor Service 38......................
Battery Charger 42............................
LESTER ELECTRICAL TECHNICIAN
SERVICE GUIDE
Electrical
System

Workman MDE
Page 3 -- 2
Electrical System
General Information
TheWorkmanMDE usesa48 voltDC electricalsystem
that is an isolated circuit. The vehicle frame is not used
for any ground connections.
The vehicle controller monitors operator and vehicle in-
putstodeterminevoltagetothetractionmotor.Ifaprob-
lemexists that willpreventnormal vehicleoperation,an
LED on the controller and the vehicle status light on the
dash panel will flash a fault code to assist in identifying
the problem.
Afterperforminganyrepaironelectricalcomponentson
thevehicle,makesure thatwiringisroutedandsecured
so as to prevent abrasion or contact with moving parts.
Operator’s Manual
The Operator’s Manual provides information regarding
the operation, general maintenance and maintenance
intervals for your Workman vehicle. Refer to the Opera-
tor’s Manual for additional information when servicing
the machine.
Opening Battery Circuit
To prevent allowing a current path through tools used
during vehicle electrical circuit repairs, remove one of
the battery cables from the battery pack as the first step
in any repair (Fig. 1). Once a cable has been removed,
the electrical system on the vehicle can be safely
workedon. Take careduringrepairs,however,tonotal-
lowtoolsorvehiclecomponentstocomplete thebattery
circuit that was opened with the cable removal.
Reattach the removed cable to the battery pack as the
laststepinanyrepair.Securecableoneachbatteryter-
minalwithlockwasherand nut.Torquenuts from115 to
125 in--lb (13.0 to 14.1 N--m).
Battery pack cable routing is shown in Figure 2.
Figure 1
1. Negative cable to vehicle 2. Positive cable to vehicle
Figure 2
A
4
1
2

Workman MDE Page 3 -- 3 Electrical System
Electrical Diagrams
The electrical schematic, circuit drawings and wire har-
ness drawings for the Workman MDE are located in
Chapter 6 -- Electrical Diagrams.
Electrical
System

Workman MDE
Page 3 -- 4
Electrical System
Vehicle Operation
TheWorkmanMDEelectricalsystemusesa48voltbat-
tery pack, an electric traction motor, a vehicle controller
and numerous other electrical components to allow ve-
hicle operation.
Eight, 6 volt, deep cycle batteries that are connected in
seriesprovidecurrent fora48voltDC,hightorque trac-
tion motor, the vehicle controller and vehicle accesso-
ries (headlights, horn, various optional accessories).
The batteries are discharged as the vehicle is used so
charging the batteries after using the vehicle is neces-
sary. A battery discharge indicator gauge on the dash
providestheoperatorwithinformationonbatterycharge
level. Demands on the vehicle during use (speed, pay-
load, incline use), battery condition (age, charge level),
ambient temperature and vehicle condition will all put
constraintsonhowlongavehiclecanbeusedbeforethe
batteries are discharged.
An automatic, 115 VAC (230 VAC on international mod-
els)batterychargerisincludedwiththevehicle.Aninter-
lock switch on the vehicle charger receptacle prevents
the vehicle from operating when the charger cord is
plugged into the vehicle.
The electric traction motor directly drives a double re-
duction transaxle with differential. Operator inputs for
forward/reverse,supervisor switch position(highor low
speed) and accelerator pedal position are used by the
controller to determine voltage to the traction motor.
The traction motor is cooled with an external fan. Addi-
tionally, the motor is protected from overheating by a
thermal switch in the motor housing. If unsafe motor
temperature is sensed by the switch, the controller is
signaledtolimitvehiclespeedandtorqueuntilthemotor
temperature reduces to a normal level.
Thevehiclecontrollerisasealedelectroniclogicdevice
that uses inputs from several vehicle components to
controlmotorspeedanddirection.Theseinputsinclude
several switches (on/off, forward/reverse, accelerator,
supervisor, charger), a motor temperature sensor, an
acceleratorpedalpotentiometerandthevehiclecontac-
tor(solenoid).Thecontrolleralsoprovidesregenerative
braking to assist in slowing the vehicle. The controller
has fault detection capabilities to help identify system
problems. Battery current is available to the controller
whenever the on/off switch is ON which energizes the
main contactor. A high current fuse protects this high
current circuit.
The Workman controller also provides a roll off warning
ininstanceswhenthevehiclebeginstomove(rollaway)
after being stopped. On an incline and with the on/off
switch in the ON position, if the vehicle starts moving,
the alarm will sound warning the operator that the ve-
hicle is moving. When the vehicle goes into this roll--off
mode, regenerative braking will limit vehicle speed.
Vehicle accessories include headlights, horn and op-
tional electrical equipment. The accessories contactor
(solenoid) on the vehicle provides battery current to
these components when the on/off switch is ON. Fuses
provide circuit protection for these accessories.