Tow Tuff TMD-3500ETD User manual

Adjustable Electric Trailer Dolly
OWNER’S MANUAL
WARNING:
Carefully read and understand all ASSEMBLY AND OPERATION
INSTRUCTIONS before operating. Failure to follow the safety rules and other
basic safety precautions may result in serious personal injury.
20191224
Model # TMD-3500ETD

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Thank you very much for choosing this product! For future reference, please complete the owner’s
record below:
Model: ____TMD-3500ETD____ Purchase Date: _______________
Save the receipt, the warranty, and these instructions. It is important that you read the entire manual
to become familiar with this product before you begin using it.
This product is designed for certain applications only. The manufacturer cannot be responsible for
issues arising from modification. We strongly recommend that this product not be modified and/or
used for any application other than that for which it was designed. If you have any questions relative
to a particular application, DO NOT use the product until you have first contacted us to determine if
it can, or should, be performed on the product.
For technical questions, please call 1-218-943-6296.
INTENDED USE
Tow Tuff brings the easy way to move trailers with the TMD-3500ETD heavy-duty adjustable trailer
dolly with 3 casters. This adjustable trailer dolly is the perfect way to move trailers into storage,
through tight areas, & in spaces that hard to drive. The 3,600 lb. Capacity of this dolly allows you to
easily move a wide variety of trailers. The handlebar and built-in 24V battery and 500w motor
eliminates the need to bend over altogether! With exceptional power, control, durability, and duration,
the TMD-3500ETD is perfect for moving further distances easily and comfortably with just the pull of
a trigger.
TECHNICAL SPECIFICATIONS
Item
Description
Capacity
Trailer Weight: 3,600lbs; Tongue Weight: 600lbs
Power Supply
DC24V, 7Ah
Hitch Ball
2”
Dimensions
42"x24"x40"
GENERAL SAFETY RULES
WARNING: Read and understand all instructions. Failure to follow all instructions listed
below may result in serious injury.
1. Always know your dolly. Take time to fully read the installation and operator's guide in order to
understand your dolly and its operations.
2. Never store battery pack in a tool box or box with nails, screws, keys, etc. Shorting of battery
terminal may cause fire.
3. Always avoid contact with battery fluid, which may occur under extreme use or temperature
conditions.
4. Always dispose or recycle battery according to local ordinances/regulations.
5. Always protect terminals with insulating tape, prior to disposal, to prevent shorting.
6. Never attempt to disassemble the battery. Battery is sealed.

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7. Never charge damaged battery packs, replace damaged pack immediately. Battery short or fire
may result.
8. Never incinerate the battery pack even if it is severely damaged or is completely worn out.
9. Never operate trailer dolly in an environment containing explosive or combustible material.
10. Always remove the battery when the unit is not in use for extended periods.
11. Always use Tow Tuff charger to charge lead-acid battery pack, Other types of batteries may
burst causing damage and injury to person.
12. Never operate charger with damaged cord or plug. Replace immediately.
13. Never use Tow Tuff charger to charge other batteries.
14. Never operate charger if it has received a sharp blow, been dropped or otherwise damaged in
any way.
15. Never charge battery in damp or wet environments. Do not cover the charger with clothes or
similar items during charging.
16. The use of accessories which are not recommended or supplied by the charger manufacturer
may present a risk of fire, electric shock or personal injury.
17. Always charge battery at temperatures between32°F-120°F (0°C-49°).
18. Always store battery at temperatures between 32°F-86°F (0°C-30°C).
19. Always disconnect charger when battery is fully charged.
20. Always charge battery every three months if not in use.
21. Do not exceed the maximum capacity of the trailer dolly: Trailer weight: 1620kgs /3600lbs,
tongue weight: 270kgs / 600lbs.
22. Make sure the hitch ball and the coupler are locked securely before use
23. Always use factory approved mounting hardware, components, and accessories.
24. Do not use the dolly on the downhill slope, always make sure that the road is flat, and the slope
angle is less than 4 degrees when pulling uphill.
25. Do not use dolly to move people.
26. Do not operate this dolly under the influence of alcohol or drugs.
27. Be sure to remove any elements or obstacles that may hinder the safe operation of the dolly.
28. When installing, assembling, repairing or not using the dolly, be sure to disconnect the power
supply of the dolly.
29. Never operate or install the trailer dolly without reading or understanding the operator's manual.
30. DO NOT allow children to operate this dolly.
CAUTION: Do not allow persons to operate or assemble this Adjustable Electric
Trailer Dolly until they have read this manual and have developed a thorough understanding
of how the Adjustable Electric Trailer Dolly works.
WARNING: The warnings, cautions, and instructions discussed in this instruction
manual cannot cover all possible conditions or situations that could occur. It must be
understood by the operator that common sense and caution are factors that cannot be built into this
product, but must be supplied by the operator.
SAVE THESE INSTRUCTIONS

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WORK AREA
•Keep work area clean, free of clutter, and well lit. Cluttered and dark work areas can cause
accidents.
•Keep children and bystanders away while operating a Adjustable Electric Trailer Dolly.
Distractions can cause you to lose control, so visitors should remain at a safe distance from the
work area.
•Be alert of your surroundings. Using a Adjustable Electric Trailer Dolly in confined work
areas may put you dangerously close to sharp tools and rotating parts.
PERSONAL SAFETY
•Stay alert, watch what you are doing, and use common sense when using a Adjustable
Electric Trailer Dolly. Do not use a Adjustable Electric Trailer Dolly while you are tired or
under the influence of drugs, alcohol, or medication. A moment of inattention while operating a
Adjustable Electric Trailer Dolly may result in serious personal injury.
•Dress properly. Do not wear loose clothing, dangling objects, or jewelry. Keep your hair,
clothing, and gloves away from moving parts. Loose clothes, jewelry, or long hair can be caught
in moving parts.
•Use safety apparel and equipment. Use safety goggles or safety glasses with side shields that
comply with current national standards or, when needed, a face shield. Use a dust mask if
working in dusty work conditions. This applies to all persons in the work area. Also use non-skid,
safety shoes, hard hats, gloves, dust collection systems, and hearing protection when
appropriate.
Adjustable Electric Trailer DollyUSE AND CARE
•Do not modify the Adjustable Electric Trailer Dolly in any way. Unauthorized modification
may impair the function and/or safety and could affect the life of the equipment. There are
specific applications for which the Adjustable Electric Trailer Dolly was designed.
•Always check for damaged or worn-out parts before using the Adjustable Electric Trailer
Dolly. Broken parts will affect the Adjustable Electric Trailer Dolly operation. Replace or repair
damaged or worn parts immediately.
•Do not exceed the Adjustable Electric Trailer Dolly load capacity.
•Distribute the load evenly. Uneven loads may cause the Adjustable Electric Trailer Dolly to
tip, resulting in personal injury to the operator or others.
•Use the Adjustable Electric Trailer Dolly on flat and level surfaces capable of supporting the
Adjustable Electric Trailer Dolly and its maximum load. Pulling or pushing a load on a slanted
or uneven surface can result in loss of control.
•Store idle Adjustable Electric Trailer Dolly. When Adjustable Electric Trailer Dolly is not in
use, store it in a secure place out of the reach of children. Inspect it for good working condition
prior to storage and before re-use.

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All UNITS COME WITH
1
Handlebar
6
Rear wheel*2
2
Connecting road
7
Charger
3
Hitch ball
8
Controller
4
Main Frame
9
Lead acid battery*2
5
Swivel Wheel
STRUCTURE INTRODUCTION
1. Switch Button- Switch for “forward” or “reverse”
2. Speed controller: Drive with various speed by this controller
3. Connecting rod - connect the handle and main frame
4. Power Switch-Start this before use the power dolly, and shut down the dolly after use.
5. Battery box-Lead acid battery & controller installed inside
6. Ball mount- Connect the hitch ball with the trailer
7. Adjustable ball mount
8. Latch- locked while ball mount height adjusted
9. Machine Controller
10. Batteries: 2*12V -7AH lead acid battery
11. Rear Wheel : Transaction transmission
12. Motor: power Supply
13. Swivel: Turn away during working
14. Main frame: support for battery box and motor
15. 15. INPUT100~240VAC, OUTPUT:DC28.8V- 2.0A
16. Recharge socket: connect with charger
17. Handlebar: install the handle and switch button

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ASSEMBLY
1. Assemble the handlebar
Insert the connecting rod into the
handle-bar, make sure the holes are
aligned and secured by bolts; Pull
the cable out from connecting rod
ends.
(See Figure 1)
2. Hitch ball mount assembly
Insert the washer and tighten the nut into
adjustable ball mount, thread the hitch ball
till completely tight.
(See Figure 2)
3. Assemble the swivel wheel
Put the swivel wheel shaft into the frame,
secure with nut and bolt
(See Figure 3)

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4. Rear wheel assembly
Install the rear wheel on the axle,
insert the flat key and tighten bolts.
(See Figure 4)
5. Assemble the adjustable hitch
Ball mount:Adjust the ball mount with the
required height, secure the latch and lock
with pin.
(See Figure 5)
6. Connecting rod assembly
Connect the battery cable from the top tube
of the main frame, and put out from the
round hole in the middle of the connecting
rod (gentle reminding: there are 2 holes
in two side of the main frame and hole
bottom, which are assistant for your
observation during the cable connection.)
(See Figure 6)

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7. Battery Assembly
Pull out the battery wire from the
inside hole on the battery box,
tighten the battery box to the
frame with bolts. (See Figure 7)
8. Battery & Controller Assembly
Place batteries into the box. DO NOT TOUCH THE BATTERY’S POSITIVE AND NEGATIVE BY
ANY METAL PARTS.A fire could result. (See Figure 8)
9. Battery cable connection (See Figure 9)

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BATTERY
Caution: Incorrect battery wire
connection may cause a
short-circuit or fire. It may
lead to battery damage, cause
a fire, or lead to physical
damage..
POWER SWITCH CONNECTION
Caution: Incorrect power switch cable connection may cause a short-circuit, it may destroy the
battery, cause a fire, or physical danger.

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10. After the wire connection, lock the
battery box, seal with the plug, installation
finished. (See Figure 10)
WARNING: Read and understand all
instructions. Failure to follow all instructions
listed below may result in serious injury.
BEFORE USE
1. Check the dolly and make sure all bolts are
tight and the hitch ball mount is secure.
2. Check all the wheels to make sure they are
in good working order, be sure the tire
pressure is 30±2psi(2.1±0.1kg/cm2)
3. Check the battery and make sure the switches are working.
4. Start the dolly before loading onto the trailer and check the dolly can forward and reverse
freely
5. Make sure the trailer weight is no more than 1620kgs/3600Lb and the tongue weight is under
270kgs/600Lb
6. Please use this dolly on flat road only. For your safety, do not use it on a slope over 4 degrees.
No brake is installed so do not use on the downhill grade.
OPERATION
1. Move the dolly close to the trailer, adjust
the ball hitch mount to correct height. Normally
leave the hitch ball 100-200mm over the weld
spots, tighten the hitch ball mount with latch
and pin. (See Figure 11)
2. Hold the assembled Ball Mount underneath
the hitch. With the Weld Spots in the correct
position, insert the Ball into the Hitch and lock
it as normal. (See Figure 12)

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3. Switch on the power and speed controller button. Check the battery status. Switch the
button into Forward or Reverse, and move the dolly with the speed controller knob. The
speed can vary up to 1.5mph. (See Figure 13)
4. Shut down the power after use. Park the dolly in the correct position. PLEASE RECHARGE THE
BATTERY WITHN 3 MONTHS.
OVERLOAD PROTECTION
This dolly is equipped with an overload protection system, it will shut down if over loaded. This will
protect the machine. Please do not try to restart when the dolly is overloaded and shut down, please
re-start after reducing the weight.
TROUBLE SHOOTING
Problem(s)
Possible Cause
Corrective Action
Dolly does not work
Power shut down.
1. Check the battery status.
2. Check the power switch.
3. Check the cable connections.
Dolly stops during use.
1. Batteries are low
2. Dolly is
overloaded
1. Recharge the dolly in full
2. Reduce the loading weight and re-start
MAINTENANCE
•Maintain your Adjustable Electric Trailer Dolly. It is recommended that the general condition
of any Adjustable Electric Trailer Dolly be examined before it is used. Keep your Adjustable
Electric Trailer Dolly in good repair by adopting a program of conscientious repair and
maintenance. If any abnormal vibrations or noise occurs, have the problem corrected before
further use. Have necessary repairs made by qualified service personnel.

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DIAGRAM & PARTS LIST

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Part No.
Description
Q’ty
Part No.
Description
Q’ty
1
Rear axle
1
22
Hex bolts M6*102
3
2
13”Rear wheels
2
23
Hex nut M6
3
3
Main frame
1
24
Washer φ6
3
4
Handlebar
1
25
Waterproof power switch
1
5
Speed controller
1
26
Battery box cover
1
6
Switch
1
27
Lead acid battery 12V
7Ah
2
7
Handle grip
2
28
Battery Box
1
8
Latch
1
29
Socket
1
9
Square tube cap
1
30
Bracket
1
10
Hex bolts M10*20
2
31
Controller
1
11
Hex bolts m10*55
2
32
Latches
4
12
Hex nut M10
6
33
Hitch ball
1
13
Hex bolt M10*30
4
34
Connecting rod
1
14
Hex bolt M4*1.5
2
35
Cable harness 1
1
15
Flat key 5*5*28A
2
36
Cross recessed pan
head screw
2
16
Square tube plug
3
37
Charging Cord Set
1
17
Round plug
3
38
Cable harness 2
1
18
8”Swivel wheel
1
39
Cable harness 3
1
19
Hex bolts M8*55
1
40
Cable harness 4
1
20
Hex nut M8
1
41
Cable terminal
1
21
Adjustable ball mount
1

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For replacement parts and technical questions, please call 1-218-943-6296.
WARRANTY
One-year limited parts warranty.
TG
PO BOX 203
Miltona, MN 56354
Made in China