Motrec T-224 Installation instructions

T-224
OPERATOR AND MAINTENANCE MANUAL
SPARE PARTS LISTS INCLUDED
SERIAL NUMBER : 1028579 & UP
Printed in Canada

One Year Limited Warranty
Effective April 25, 2005, MOTREC, Inc. (MOTREC) hereby warrants to the Original Retail Purchaser (Owner) that any of its
vehicles shall be free from any defect in materials for a period of 90 DAYS while in the possession of such Original Retail
Purchaser. This warranty IS NOT TRANSFERABLE to any subsequent Buyer.
The warranty period is extended to one year or one thousand (1,000) hours, which ever first occurs, on the electric motor,
differential (parts that bathe in oil) and the electronic speed controller. MOTREC makes no warranty or representation with
respect to the internal combustion engine, tires and batteries, since their respective manufacturers cover such parts.
Accessories (light, gage, horn, etc), electrical contacts (switch, solenoid, contactor, relay), diodes & fuses, belts & pulleys,
filters & spark plugs, lubricants, brake linings & shoes, brake drums & discs, seals, seats, trim and other items subject to
wear are not included in this warranty; nor is any item that in MOTREC sole opinion, shows evidence of neglect, misuse,
abuse, collision or alteration.
This warranty shall not apply to normal maintenance requirements as described in the User Manual, and to damages during
shipment. The latter is the carrier's responsibility. No compensation will be allowed for delays.
To initiate warranty coverage on any MOTREC vehicle, the Dealer must complete and return the “Sales/Installation Report”
to MOTREC within 30 days after delivery to the Original Retail Purchaser; or within 90 days after the delivery date to the
Dealer, which ever occurs first. Failure to follow these procedures will result in considering the warranty coverage effective
as of the shipment date from the factory.
The defective vehicle must be returned, at the Owner's expense, to an authorised MOTREC Dealer within 30 days after
failure. The Owner will not be charged for parts and labour required for warranty repairs, which must be performed by an
authorised MOTREC Dealer only. The vehicle will be returned at the owner’s expense. The Warranty Claim Forms must be
completed and returned with the defective part(s) to MOTREC within 30 days after repair was done. No compensation will be
allowed for damages caused by vehicle downtime.
It is the responsibility of the owner of the vehicle to make sure that the driver is properly trained and instructed in the safety
features and operation of the vehicle, including vehicle stability, as required by OSHA and ANSI-B56. Operators shall read,
understand and follow the safety and operating instructions in MOTREC Manual before driving the vehicle. Operators shall
not be permitted to drive the vehicle unless a complete and adequate training has been provided. Driving a vehicle
constitutes a hazard. The driver is responsible for the control of the vehicle while driving and must always evaluate and care
for all peculiar situations that he or she may meet while driving. The driver assumes the inherent hazards related to this
activity. The vehicle is designed for off-road use only. MOTREC disclaims any liability for incidental or consequential
damages, to include, but not be limited to, personal injury or property damage arising from vehicle misuse, lack of
maintenance or any defect in the vehicle.
It is the responsibility of the Owner of the vehicle to make sure that the service technicians are properly trained as required
by OSHA and ANSI-B56. Service technicians shall read, understand and follow instructions in the MOTREC manual before
servicing the vehicle. Only qualified and authorized personnel shall be permitted to maintain, repair, adjust and inspect the
vehicle.
MOTREC prohibits, and disclaims responsibility for, any vehicle modification altering the weight distribution and stability,
increasing the speed or affecting the safety of the vehicle. Such modifications can cause serious personal injury or property
damage for which MOTREC disclaims any responsibility.
For Owners that are located outside North America, the warranty period starts the date of shipment from the factory, and the
defective parts must be returned at the Owner's expense to MOTREC prior to warranty repair.
24/04/2006

Table of contents
TABLE OF CONTENTS
INSTRUCTIONS 4
SAFETY WARNINGS FOR OPERATORS 5
MAINTENANCE 6
SAFETY WARNINGS FOR SERVICE TECHNICIANS 7
DECALS AND LABELS 9
PERIODIC MAINTENANCE CHECKLIST 10
ACCELERATOR 11
BELT INSTALLATION AND TENSIONING 12
HYDRAULIC BRAKES 13
DEADMAN SEAT BRAKE 14
BATTERY MAINTENANCE 15
ELECTRICAL TROUBLESHOOTING 17
CURTIS SPEED CONTROLLER 20
WIRING :STANDARD CONFIGURATION 23
DIAGNOSTICS AND TROUBLESHOOTING 24
TROUBLESHOOTING CHART 25
LED DIAGNOSTICS 26
PROGRAMMING PARAMETERS –T-224/224D 27
SPARE PARTS 28
BODY 29
FORD F-150 DIFFERENTIAL 30
DIFFERENTIAL 32
BRAKE CONTROLS, DEADMAN SEAT BRAKE 34
STEERING WHEEL AND FRONT AXLE 35
TILT/TEL STEERING WHEEL AND FRONT AXLE 36
MOTOR AND DRIVE 37
ELECTRICAL DIAGRAM –SEPEX MAIN CIRCUIT 38
ACCESSORIES –NO DC/DC ONVERTER 39
MOTREC ILLUSTRATED ACCESSORIES 41
CONVERTER INSTALLATION 43
BATTERY DISCHARGE INDICATOR (HOBBS) 44
ADDENDUM 45
CURTIS FOOT PEDAL 46
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Instructions
INSTRUCTIONS
- 4 -

Instructions
SAFETY WARNINGS FOR OPERATORS
•FAILURE TO OBEY THE FOLLOWING SAFETY RULES MAIN RESULT IN SEVERE INJURY.
•It is the responsibility of the owner of this vehicle to train operators to ensure that they understand the operating
characteristics of this vehicle, including training in vehicle stability, and obey the following safety rules and
guidelines. Owner shall comply with OSHA and ASME/ANSI B56.8 & B56.9 regulations for vehicle use,
safety rules, operator training and certification. Do not drive this vehicle unless you are a qualified operator.
•Do not drive this vehicle under the influence of drugs or alcohol.
•Do not drive this vehicle on public roads and highways. This vehicle is designed to be driven in buildings.
•The electrical system of this vehicle will make sparks which can ignite inflammable materials. Never use the
vehicle in hazardous areas where there are inflammable materials, explosive dust or fumes in the air.
•Have your vehicle inspected regularly by trained personnel, and cease operation if a malfunction occurs.
•Do not open battery compartment to prevent battery explosion, acid splashing, severe damage to eyes or skin.
•Do not open motor compartment. Keep clear from moving, rotating(wheels, sheaves, etc) or lifting parts.
•Never carry more passengers than number allowed for this vehicle. Wait until all occupants are seated and
holding on before moving. Always keep all body parts inside vehicle. Keep both hands on steering wheel.
•Do not exceed the vehicle cargo load capacity and gross trailing weight capacity, rated for flat hard even surface.
Different operating conditions such as loose terrain or ramps reduce vehicle capacity.
•Avoid loose, unbalanced or top-heavy loads to keep a good stability and prevent overturn. Do not load cargo that
can fall off the vehicle. Do not carry cargo that is longer, wider or higher than this vehicle.
•Always depress slowly the accelerator for smooth acceleration. Avoid stunt driving or horseplay.
•Avoid sharp turns, always slow down before turning, to prevent vehicle overturn or trailer jack knife. Vehicle is
more sensitive to overturn and jack knife when traveling on inclines or when carrying a heavy load.
•Always drive straight up and down the face of an incline, never across the face, to prevent overturn and trailer
jack knife. Drive slower and start applying brakes sooner on inclines to adjust for longer stopping distance.
•Use extra care and drive slowly in reverse, in congested areas or on wet or slippery ground.
•Keep to the right under normal conditions. Maintain a safe distance from all objects.
•Slow down and sound the horn when approaching a corner or other blind intersections.
•Before leaving the vehicle, park on a level ground flat surface, turn off all switches, set the forward/reverse
switch to neutral, set the parking brake, remove the key. Do not park the vehicle on an incline.
•Before battery charging, park the vehicle in a well ventilated area set for. Do not operate it when charging. To
interrupt a charging cycle, disconnect the AC plug; disconnecting the DC plug or a battery terminal, or operating
the vehicle, could damage the charger and produce a spark, battery explosion and acid splashing.
•Use another driver to steer this vehicle while it is towed. Be sure the driver uses brakes when you slow or stop
the towing vehicle. Do not exceed 5 MPH or carry any passenger while towing this vehicle.
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Maintenance
MAINTENANCE
- 6 -

Maintenance
SAFETY WARNINGS FOR SERVICE TECHNICIANS
FAILURE TO OBEY THE FOLLOWING SAFETY RULES MAIN RESULT IN SEVERE INJURY.
Owner shall comply with OSHA and ASME/ANSI B56.8 & B56.9 regulations for vehicle maintenance.
Only qualified and authorized personnel shall be permitted to maintain, repair, adjust and inspect
carriers, vehicles, tractors, and batteries.
Before any maintenance work, park the vehicle on flat level surface, turn off all switches, remove key,
lift wheels off the ground and secure with jack stands of adequate capacity. Don’t connect charger.
Keep clear from moving parts such as tires, sheaves and motor.
Follow the maintenance instructions applicable to the type of repair, maintenance, or service.
Always wear a face shield and gloves when working around batteries.
Before opening the battery compartment, disconnect the charger, turn off all switches and remove the
key. Batteries emit highly explosive gases which greatly increase when charging; do not disturb
connections or produce sparks around batteries to avoid a battery explosion and acid splashing. Battery
acid causes severe damage to eyes or skin. Flush contaminated area immediately with water.
Use insulated tools to avoid sparks that can cause battery explosion and acid splashing.
Use two counteracting tools, double-wrench technique, when disconnecting or tightening terminals on
the battery and the speed controller to avoid cracking the terminal or battery post welds.
Before cleaning or replacing a battery, charger, speed controller, contactor, relay, diode, or any other
component in the power circuit, always disconnect the charger, turn off all switches, remove the key,
wear a face shield and gloves, identify battery polarity and disconnect battery leads, discharge the
capacitor in the controller with a 10 ohms, 25 W resistor for a few seconds across B+ and B-.
After cleaning, the power must not be reapplied until terminal areas are thoroughly dry.
On EE-Rated vehicles make sure that the control box is sealed, the static strap makes good contact with
the ground, the motor is sealed by bands, the cable protectors are properly installed.
Keep cables and wires clear from mechanical and rubbing action. Make sure that cable insulation is
free from cutting or visible damage. Make sure that EE-Rated cable protectors are properly installed.
Before replacing a fuse or circuit breaker, identify the cause of failure and repair.
Programmable controllers must be programmed using the parameter settings in this service manual,
before connecting the motor, to avoid sudden vehicle movement and accident.
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Maintenance
Do not try to increase motor speed by changing parameter settings in the speed controller; it can cause
accident and severe damage to the motor.
SEPEX speed controls are protected by a diode in the power circuit to filter inductive loads in the event
of a sudden power interrupt. Some speed controllers require a diode to filter inductive loads on the KSI
input. Removing the diodes will cause the speed control failure.
Before resuming maintenance operations, inspect safety warnings stickers and replace any if damage is
found and part of the text can’t be read.
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Maintenance
DECALS AND LABELS
! CAUTION !
The images included in this section depict the decals/markings installed on the vehicle. It is of
the utmost importance that theses decals/markings remain unaltered and readable. Else, the
sticker or the part baring the marking has to be replaced.
Dashboard security warning label:
General security warning label:
Respectively, key switch markings, forward/reverse selector markings and light switch marking:
- 9 -

Maintenance
PERIODIC MAINTENANCE CHECKLIST
! WARNING !
Maintenance operations must be made by properly trained service technicians.
−Keep clear from moving parts such as tires, sheaves and motor.
−Check for all EE protections, when applicable, and keep cables and wires clear from mechanical and rubbing action
−Batteries contain sulphur acid that can cause severe burns on skin or eyes.
−When working around batteries, wear acid proof protective equipment: face shield and gloves.
−Use electrically insulated tools to avoid sparks that can cause battery explosion.
−Before any maintenance work, park the vehicle on a flat level surface, turn off all switches, remove the key, lift the wheels off the
ground and secure with jack stands of adequate capacity, identify and disconnect battery leads. Don’t connect the charger.
PERIOD
CHECK/PERFORM HOURS DAY WEEK 20 MONTH 50 QUART. 200 YEAR 1000 2 YEARS 2000
MECHANICAL DAMAGE, OIL LEAKS X
REVERSE ALARM, DEADMAN SWITCH X
STATIC STRAP, min 2” contact with ground X
TIRE PRESSURE, pressure rating on tire X
CHECK/FILL BATTERIES, add distilled water to cover
plates. Fill to recommended level after batteries have
been fully charged. X
WARNING DECALS & MARKINGS X
EE-Rated CABLE PROTECTORS, SEALED MOTOR,
SEALED CONTROL BOX. X
MASTER CYLINDER FLUID (DOT 3) X
BRAKE PEDAL TRAVEL
2” (50 mm) maximum travel X
STEERING FOR PLAY X
PARKING BRAKE LEVER
requires 10 lbs. (5 kg) force to apply X
BELTS AND PULLEYS
-10 lbs (5kg). force for 1/8” (3mm) deflexion;
-pulleys alignment, see procedure. X
CLEAN/TIGHTEN WIRE TERMINALS X
WASH BATTERY TOP WITH WATER X
MOTOR BRUSHES FOR WEAR
-brushes must exceed holders X
ACCELERATOR ADJUSTMENT
-1/8” (3 mm) travel to activate micro-switch;
-0 to 50 ohms when micro-switch activated;
-4500 to 5500 ohms with pedal down.
X
HYDR. BRAKE LINES FOR LEAK X
STEERING ASSEMBLY, as instructed X
BRAKE MECHANICAL LINKAGES
for wear & play X
BRAKE LININGS FOR WEAR
1/16” (1.5 mm) minimum lining thickness. X
LUBRICATE brake pedal pivots, steering column, ball
joints and kingpins. X
OIL (SAE 30) LEVEL IN DIFFERENTIAL
Before adding oil, check oil seals for leaks. X
FRONT WHEEL BEARINGS PLAY X
TIGHTEN NUTS/BOLTS, electric terminals; drive;
steering; brakes; suspension; body. X
REPLACE DIFFERENTIAL OIL(SAE 30) X
CLEAN AND RE-PACK FRONT HUBS X
SERVICE DIFFERENTIAL, replace the three oil seals,
wheel bearings, oil (SAE 30) X
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Maintenance
ACCELERATOR
GEAR
−Remove the cover.
−Backlash between gears must be reduced to a minimum by sliding holder; use locktite 262
to lock the three screws.
−When the plastic gear is fully depressed a small backlash must remain between the gears.
−When the plastic gear is released its rear portion must not exceed the pedal case.
MICRO-SWITCH
The micro-switch must deactivate the on/off solenoid when the accelerator is released; turn the
adjusting screw (shown on figure below) to adjust the micro-switch height.
POT
−Remove the terminals 2 and 3 on PMC to measure resistance signal.
−When the micro-switch is activated the signal must be less than 50 ohms. When the front
portion of the pedal is fully depressed the signal must be more than 4600 ohms.
−To modify the resistance, turn the adjusting screw to change the micro-switch height (see
figure below).
Proceed with the same verifications after the accelerator cover is on and then connect terminals 2 and 3.
- 11 -

Maintenance
BELT INSTALLATION AND TENSIONING
INSTALLATION
Adjust the sprockets using a straight edge. Slide up the edge on the larger pulley until it contacts the
smaller pulley. Properly adjusted pulleys will provide three points of contact. Properly aligned pulleys
will provide four points of contact. Tighten setscrews and recheck alignment.
TENSIONING
Check the force F required to provide a deflection of 1/8 in. If the measured force is less than 15 lbs
then lengthen centre distance C.
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Maintenance
HYDRAULIC BRAKES
DRUM BRAKES
Remove brake drums and check linings wear; the linings should have a thickness exceeding 1/16" (1.5
mm). Turn the brake adjustment to reduce the clearance between lining and drum but avoid contact or
drag when the wheels are turned and the pedal is released.
DISC BRAKES
Check pad linings for excessive wear; the linings should have a thickness exceeding 1/16" (1.5 mm).
Disc brakes are self-adjusting.
BRAKE PEDAL
If the brake pedal becomes soft or spongy, air may have entered the hydraulic system and the brake
system has to be bled:
1. fill the master cylinder with brake fluid (DOT-3);
2. bleed front callipers one at a time by having someone applying a steady pressure on the brake
pedal, and close the bleeder before allowing the brake pedal to return to up position;
3. fill the master cylinder with brake fluid (DOT-3);
4. bleed rear wheel brakes one at a time, following the same procedure;
5. fill the master cylinder with brake fluid (DOT-3);
6. clean every fitting and line, remove traces of oil;
7. apply a continuous pressure on the brake pedal for about five minutes ;
8. Finally, inspect brake lines and fittings for leaks ;
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Maintenance
DEADMAN SEAT BRAKE
Maintenance work must be performed by trained personnel only. Before any maintenance work, turn key
switch to off and disconnect battery terminal.
LUBRICATION:
Grease the spherical rod end, two pillow blocks and brake cable arm.
CHECK BRAKE PAD:
Minimum brake pad wear is 1/8 inch ( 3 mm ).
SEAT ADJUSTMENT:
1. Unscrew the jam nut on the spherical rod end of the push rod, under the seat.
2. Unscrew the push rod until a 1/8 inch (3mm) gap remains between the pivot and the spring rods
(see figure A).
3. Tighten the jam nut.
SPRING ADJUSTMENT:
Tighten the spring adjustment rods until they exceed the bracket by two inchs (50 mm) as shown on
figure B.
BRAKE PADS ADJUSTMENT:
1. Slide the seat fully rearward.
2. Unscrew the jam nut on the brake cable adjustment bolt, on the outer brake pad.
3. Unscrew the adjustment bolt to increase brake pressure.
4. The springs must be able to apply the parking brake when the seat is raised slowly.
5. Check the deadman seat switch; it must be activated when the seat is raised.
6. Tighten the jam nut.
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Maintenance
BATTERY MAINTENANCE
! WARNING !
−It is the responsibility of the owner of this vehicle to ensure that the service technicians are
properly trained, read and obey the safety rules and guidelines in this manual (ANSI B56).
−Maintenance operations must be made by properly trained service technicians only.
−Before any maintenance work, park the vehicle on a flat level surface, turn off all the
switches, set to neutral, remove the key, lift the wheels off the ground and secure with jack
stands of adequate capacity.
−Keep charger disconnected while doing any maintenance work.
−Always wear a face shield and scarf when working around batteries.
−Battery emits highly explosive gases; do not produce sparks to avoid battery explosion and
acid splashing. Battery acid causes severe damage to eyes or skin. Flush contaminated area
immediately with water.
−Use insulated tools to avoid sparks that can cause battery explosion and acid splashing.
−Use two counteracting tools, double-wrench technique, when disconnecting or tightening
battery posts.
−Before cleaning or replacing a battery, discharge the capacitor in the controller with a 10
ohms, 25 W resistor for a few seconds across B+ and B-, identify battery polarity and
disconnect battery leads.
−After cleaning, the power must not be reapplied until terminal areas are thoroughly dry.
BATTERY LEADS AND CONNECTORS
Check for loose connections, damaged cables, acid spill, loose terminal posts, quarterly.
BATTERY POST CORROSION
If corrosion is present on battery posts, remove the cable connectors, use a wire brush to remove
particles, and then clean them with a cloth that has been moistened with ammonia.
ELECTROLYTE LEVEL
Does not apply to sealed battery.
−Disconnect battery connectors on roll-out or lift-out installations.
−Make sure the battery roll-out tray is provided with stops before rolling out.
−Fill with distilled water.
−Daily charged batteries normally require watering once a week. Under watering leads to a
shortened battery life. Over watering leads to battery corrosion. Be careful not to overfill any cell to
avoid electrolyte to be forced out while charging.
−Fill each cell to plate level with distillated or de-ionized water, before battery charging. When the
battery is charged, the fluid expands and can seep out if overfilled. Refill each cell after full charge,
when the fluid has expanded to its maximum level.
−Reinstall battery caps before charging.
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Maintenance
BATTERY MOUNTING
A loose battery increases damaging effects of vibrations and is more prone to short out.
BATTERY DISCHARGE LIMIT
Discharging below a 20% state of charge cuts down the battery life and the number of cycles available.
At 20% state of charge, specific gravity of 6V battery should be 1180; and 1220 for industrial battery.
CHARGING AREA
−Always charge battery in a well ventilated area set for and approved for charging.
−Never leave a charger connected for more than 20 hours.
FREQUENCY OF CHARGE
−When a battery is discharged to its 20% state of charge, it is best to charge immediately.
−Batteries require a low current equalization charge (min 4 hours) at least every week, to equalize
battery cells, improve battery performance and life in number of cycles.
−Never leave a charger connected for more than 20 hours.
STORAGE
−Keep the battery from getting cold, it would loose its capacity.
−Let the battery warm up before charging.
−Charge batteries in “stored” vehicles every month.
DEFECTIVE BATTERY
Check specific gravity of each cell; if a cell is shorted, voltage drop may occur only when there is
current.
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Maintenance
ELECTRICAL TROUBLESHOOTING
! WARNING !
Maintenance work must be performed by trained service technicians only.
It is the responsibility of the owner of this vehicle to ensure that the services technicians are properly
trained, understand and obey the safety rules and guidelines (ANSI B56).
All service technicians must read and understand the maintenance warning section in this manual.
! WARNING !
Before any maintenance work, park the vehicle on a flat level surface, turn off all switches, remove the
key, lift the wheels off the ground, secure with jack stands of adequate capacity, disconnect charger.
Always wear safety glasses.
Batteries emit highly explosive gases that can be ignited by a spark. Before disconnecting a high
current terminal, turn off all switches, disconnect battery charger, disconnect batteries.
Keep clear from moving parts such as tires, sheaves and motor.
PMC SELF DIAGNOSTIC
If your PMC comes with a status led, use the flashing code to help troubleshooting.
BATTERY VOLTAGE
Make sure batteries are securely connected. Measure voltage between + and - terminals. We will call
this value B+ or full battery voltage.
ACCESSORIES NOT WORKING
−Check the fuses on the batteries and the DC/DC converter.
−Check voltage across + and – terminals on the battery gage; if not B+, check wiring.
−Turn the key switch ON, check voltage between output terminal on the key switch and the -
terminal on the battery gage; if not B+, replace the key switch.
−Check voltage across DC/DC converter output terminals; if not 12-Volt, replace the converter.
−Depress the accessory switch, check voltage across accessory terminals. If not 12-Volt, replace the
switch. If 12-Volt, replace the accessory.
FORWARD ONLY
On a SEPEX motor control, check the reverse signal input on the controller.
On a series wound motor control, a bad reverse contactor is the most probable cause of the problem.
Switch to reverse and check voltage on the reverse control wire. If not B+, replace the F/R switch. If
B+, turn off the key switch, disconnect batteries, disconnect power terminals on the F/R contactors,
check the resistance across N.C. power terminals of the reverse contactor. If not 0 ohm, change the
reverse contactor. If 0 ohms, switch to forward and check the resistance across the forward N.O. power
terminals. If not 0 ohms, change the forward contactor.
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Maintenance
REVERSE ONLY
On a SEPEX motor control, check the forward signal input on the controller.
On a series wound motor control, a bad forward contactor is the most probable cause of the problem.
Switch to forward and check the voltage on the forward control wire. If not B+, replace the F/R switch.
If B+, turn off the key switch, disconnect batteries, disconnect power terminals on the F/R contactors,
check the resistance across N.C. power terminals of the forward contactor. If not 0 ohm, change the
forward contactor. If 0 ohms, switch to reverse and check the resistance across the reverse N.O. power
terminals. If not 0 ohms, change the reverse contactor.
TRAVEL AT REDUCED SPEED
Check batteries.
Turn off all switches and disconnect charger. Wear face shield and gloves. Do not disturb any
battery connection to avoid sparks. Check the specific gravity of each cell. Cold batteries,
highly discharged batteries or dead cells are the most frequent causes of reduced travel speed.
Check potentiometer.
Turn off the key switch, disconnect potentiometer terminals. Check the resistance between
terminals.
Other causes of lower speed:
−dragging brakes;
−cold temperature (higher differential oil viscosity).
INTERMITTENT OPERATION
A bad potentiometer is the most probable cause of the following:
−acceleration is not constant;
−maximum speed is erratic;
−sudden stop after a bump or shock;
−erratic starts, requiring several pedal cycles.
A bad F/R contactor is also a probable cause of the following:
−sudden stop after a bump or shock;
−would not start to move at times.
Erratic starts could also be the cause of a misadjusted potentiometer or micro-switch; the pot signal
must be less than 50 ohms when the micro-switch turns on.
PMC has an HPD safety feature that prevents the vehicle from moving if the accelerator pedal is
depressed before the key switch is ON and seat switch is activated.
PMC may also have an SRO safety feature that prevents the vehicle from moving if the F/R switch is
activated before turning on the key switch and activating the seat switch.
The vehicle stops on a steep and long ramp or while towing a heavy load: the circuit breaker has open
to prevent motor overheating and will reset automatically after one minute. The PMC is also equipped
with an internal thermal protection that cutback the current until the PMC has cooled down.
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Maintenance
NO MOTION
Make sure that the PMC surface is clean and dry; check the terminal areas. Dust Particles or acid
contamination, can create current leaks and cause a PMC malfunction.
Check F/R switch
Turn on the key switch and set to forward. Check voltage between the forward terminal and the
– terminal on the battery gage, check voltage between the reverse terminal and the – terminal on
the battery gage; if both B+, replace the F/R switch.
Check switches and wiring
Disconnect control terminals on the PMC and check all control signals. If a switch pin does not
read B+, check wiring or replace the switch.
Check potentiometer
Turn the key switch to OFF, disconnect potentiometer terminals. Check the resistance across
terminals: if not within the recommended limits, adjust or replace the potentiometer. Check for
shorts between potentiometer wires and vehicle frame; resistance should read at least 1
megohm.
Check main contactor or solenoid
Check voltage across power terminals; if not B+, check circuit breaker or replace the solenoid.
Turn to on the key switch and activate the seat switch. Check voltage across the coil terminals;
if not B+, check wiring and interlock switches. Check resistance across power terminals; if not
0 ohms, replace the solenoid.
Check circuit breaker and SEPEX DIODE
Before replacing the circuit breaker, check for shorts in the power circuit and check the SEPEX
diode in the power circuit using a diode tester. If no such instrument is at hand, use an
ohmmeter: the reading should be weak in one direction and strong in the other way.
Check the resistance across the circuit breaker. If not 0 ohms, replace the circuit breaker.
Check PMC
First disconnect battery B+ and B-, then PMC B+ and M-. Check the internal diode between B+
and M- terminals using a diode tester. If no such instrument is at hand, use an ohmmeter: the
reading should be weak in one direction and strong in the other way. If the internal diode is
defective, the PMC must be replaced.
Check the Motor
First disconnect battery B+ and B-, disconnect power terminals and check the motor armature
and field for opens.
- 19 -

Curtis Speed Controller
CURTIS SPEED CONTROLLER
- 20 -