MJM MT-20 User manual

MT-20 and MTF-20
MTMTF-20 –Fat Tire Mountain
USER’S MANUAL

Thanks for purchasing an MJM WHEELS™
MT-20 Double suspension Mountain or the
MTF-20 Fat Tire Mountain electric bike.
MJM WHEELS™ is based in CANADA, producing high-quality and unique style
electric bike with high-profile components.
Open the carton box and take out your MTF-20 carefully. The package has
following items:
MT-20
or
MTF-
20
CHARGER
PEDALS
FRONT
WHEEL
AXLE
F/R
REFLECTOR
Remove all zip ties and packing material, being careful when it comes to the edge
of the frame, tire and rim.
Follow steps to assembly your MT-20 or MTF-20 ebike

Install Front Wheel
Make sure the brake disc is placed in the center of caliper gap and front wheel can rotate
freely without any noise.
When the brake disc is not in the gap, DO NOT pull brake lever.

Install Pedals
Use the pedal marked with an “L” on the left side and the right pedal marked with an “R”
on the right side (side with drivetrain gears). The right-side pedal has a right-hand thread
(removes counterclockwise, installs clockwise); the left side pedal has a left-hand thread
(removes clockwise, installs counterclockwise). Be careful to not cross thread the pedals.

Insert, Remove or Adjust Saddle Height

Charge Battery before Your First Ride
*On the charging adapter, the red light stands for charging, while green light indicates the
charge is complete.
Make sure to charge your battery to full capacity before first ride.

Some Battery Tips
⚫Lithium battery capacity is reduced every time they have been used.
⚫MJM WHEELS™ genuine battery provides 600~800 charging cycles.
⚫Stay away from extreme environment. The suggested temperature operating limits
for the battery is -10C to 45C. Do not store need excessive heat.
⚫Do not allow the battery to be submerged in water or to be shorted out.
⚫The battery indicator bar on LCD display is only an approximate indicator of the
remaining charge.
⚫Frequent accelerating and braking will drain the battery charge more quickly than
using it to maintain a consistent speed ride.
⚫A battery will drain about 5% for every 8 hours of being left in stand-by mode.
⚫If you are not going to use the battery for an extended period of time, take out the
battery and store it in a cool, dry place.
⚫Do not use battery when it has less than 10% capacity left.
⚫Our bike is resistant to splashing, but not water-proof. Please do ride the bike
through water deeper than 17.5 cm. The controller box will short out.
⚫If you have been charging your battery for more than 12 hours and it is not yet fully
charged, take it off the charger and contact MJM WHEELS™.
⚫The charger may get warm to the touch, so make sure you charge they are in an
open area and do not lay anything on the charger unit while charging.
⚫·Be friendly to the environment! Be sure to recycle your old batteries at a local
battery recycling center. Do not throw them in the garbage.

Battery Storage
How to store your battery for a extended time?
Charge the battery every 3 months to avoid capacity loss. Batteries slowly self-discharge when
left unused for a long time. If a battery is allowed to reach a critically low voltage, their lifespan
and capacity will be permanently reduced.
Always disconnect your charger from the wall outlet and battery before storing the battery.
Avoid storing your battery in extreme temperatures, whether hot or cold.
Batteries are best kept in a cool, dry place. Do not allow batteries to accumulate condensation,
as this could cause shorting and corrosion.
Uninstall & Install Battery
Besides charging the battery while it is in the ebike, you can also take it off the bike and
charge the battery at home or in the office.
Turn the key to unlock position, then PULL the lever at the top of battery to remove it
When you install battery, do the same but start from the bottom part.

Error Code
Definition
Solution
21
Current Abnormality
Replace controller
22
Throttle Abnormality
Disconnect throttle
wire (located in
controller box, or in
front of handle bar if
the bike has water
proof quick release
connector) to see
whether the ERROR
code disappears. If
disappear, replace
throttle.
23
Motor Abnormality
Re-connect motor
wire (located
underneath the chain
stay at right side). If
still doesn’t work,
replace with a new
motor.
Troubleshooting
If there are errors about the electronic control system, the error code will appear
automatically.

24
Motor Hall Abnormality
Contact with seller,
return full rear wheel
to replace a motor
rotor.
25
Brake Abnormality
Disconnect 2 brake
lever wires(located in
front of handle bar to
see whether the
ERROR code
disappears. If yes,
replace the brake
lever and reconnect
brake lever wire to
controller.
30
Communication Abnormality
Disconnect all wires
(brake lever, display,
throttle, and motor)
then reconnect. Check
all connectors are in
good connection.

As a final check, please go through this checklist to make sure
your bike is properly assembled and safe to ride:
■Handlebars
Ensure handlebars are straight and secure and all relevant bolts are tight.
Test that they are securely attached to the forks by gripping the front wheel
between your legs and attempting to turn the handlebars.
■Wheels
Ensure the front and rear mudguard stays are tight.
Check that the quick release mechanism is tightly gripping the front wheel.
■Seat and post
Ensure that the seat is straight and secure.
■Pedals and chain
Ensure the pedals are fully wound in, and tight. .
■Chain
Ensure that the chain is properly set up the gears

■Brakes
Test front and rear brakes whilst rolling the bike forwards – both wheels should stop completely.
Test that there more than a fingers width between the grip and the brake lever
when fully depressed.
■Rack
Ensure that the rack is secure and that all visible bolts are tight.
■Kickstand
Rock the bike gently from side-to-side to ensure that the kickstand does not wobble. Tighten
the bolt on the frame directly above the kickstand if necessary.
■Tires
Pump the tires to the point that they are firm and cannot be deformed with
your thumb. This is equivalent to roughly 60ppi of pressure for the Sport and
Classic models and 50ppi for the Urban.
■Electrics
Test the pedal assist function by rotating the pedals with the rear wheel raised.
Fully charge the battery before use.

Before riding:
Adjust the height of the handlebars and saddle to suit the rider, whose toes should be able to
just touch the ground.
■Check that all lights and displays are working.
■Check regularly to ensure that the electrical connectors between the bike
and battery are clean.
■Check the brakes: this can be done by putting the front brake on and
pushing forwards. Do the same with the back brakes. The bike should not
move and the brake levers should not touch the handlebars. The brakes
should work without having to press down too hard on the handles.
■If your bike has a quick release on the front wheel then check that this is
properly tight in its position within the front forks. Quick release
mechanisms can more easily work loose than conventional axles and so
should be checked often for tightness.
■Wear an approved safety helmet when riding your e-bike:
■After mounting the bicycle, turn on the main switch, the power display
light will come on, indicating power is connected
■Release the kickstand, mount the bike, placing one foot ready to pedal,
check that it is safe to proceed, and then set off. You will feel the
motor as you begin to pedal.
■As you cycle, the battery power will be consumed, and the power level

indicator lights will indicate this reduced battery life. .
■Use both brakes together when stopping; do not use only one brake.
■Remember when riding in wet or snow conditions your brakes will be less effective
and a greater stopping distance is needed.
■Do not ride through deep puddles or streams. Ensure that water never
reaches the motor and controller level. This could short out the power and void the warranty
■Do not carry passengers
■Do not ride under the influence of drugs or alcohol, or when feeling unwell.
■Do not ride at night without lights. If the lights are not working it may be
safer to walk with the bike.
MJM WHEELS™ LIMITED WARRANTY

If the warranty is void for any reason the customer shall bear any repair or replacement costs
resulting from ebike misuse, negligence or abuse.
Always follow care and preventive maintenance procedures
Always keep receipts from any services performed to the ebike by an authorized distributor or
service center.
The warranty will be voided by any of the following circumstances:
（1） Failure to follow all directions or recommendations listed in this warranty and user’s
manual.
（2） Cycling collision, accident or ebike damage caused by careless parking or storage.
（3） Acts in violation of laws and regulations.
（4） Service or maintenance work not performed by an accredited technician. performed
service or maintenance on components
（5） DIY repairs on electronic components.
（6） Abusive use the ebike in off-road terrain, mud, snow, water, sand, gravel and
water puddles.
（7） If ebike is used as rental unit
（8） Damages caused by natural disasters such as earthquakes, lightning, fire, flooding and
other hazards .
（9） Rust and/or paint fading caused to heavy exposure to rain, hail, snow or sunlight.
（10）Overloading beyond recommended capacity .
（11）Damages caused by nails, needles, broken glass , debris , sharp rocks or other
foreign objects .
（12）If ebike is used for stunting such as jumping from ramps, stairs or elevated
surfaces.

（13）If ebike is used in competitions or racing
(14) If ebike has been modified for any purposes on the motor, electrical system, suspension
frame, wheels.
(15) Use of other components not approved by the manufacturer
(16) Damages resulted from improper transportation
Due to the nature of the product some components must be purchased exclusively from the
manufacturer. These would include, but are not limited to limited to the battery, motor, main
gauge cluster, controllers, Led headlights, brake drums or disc rotors and pads etc. Other
components such as tires, tubes, saddle, racks, and baskets may be used from market-ready or
compatible products previous approval from the retailer or manufacturer.
Get more information of about promotions or new product launches at:
www.mjmwheels.com