DUOTTS 291 Electric Bike User Manual

June 4, 2024
DUOTTS

DUOTTS logo E-BIKE
USER MANUALDUOTTS 291 Electric Bike

Attention!
Please keep the instruction manual properly!
To ensure your safety, please read the instruction manual carefully before using the electric bicycle to better understand its performance of the electric bicycle.
Required preface
Dear user friends:
First of all, thank you for choosing to buy our products. All the staff of our company expresses their heartfelt thanks for your choice! This manual will introduce you to the common sense and maintenance methods of electric bicycles produced by our company. Please read the manual carefully after purchasing to understand the performance, characteristics, precautions, and maintenance common sense of this bicycle, make sure you use the electric bicycle safely in the best driving condition. In order to ensure the safety of using our electric bicycle, please be sure to use our professional spare parts. If you have any questions, please contact our authorized service station or our company. Dear users, when purchasing the products of our company, please fill in the “electric bicycle sales (warranty) registration card” in detail completely and clearly and keep the “user warranty” properly, deliver the other two copies to the company’s resident service station or distribution unit so that we can contact and serve you in time. #Important Tips

  1. The patterns and text descriptions of this manual are only used as instructions for operation and are not used as the basis for the inspection of products;
  2. The illustration in this manual may not match the actual product, and the style of the actual sales shall prevail;
  3. The company has the right to improve product performance and related configurations without prior notice;
  4. This vehicle can only ride alone and do not carry people. Your choice-the beginning of our service!” In the following days, we will wholeheartedly provide you with convenient, timely, fast and satisfactory service! Please read the instructions carefully before using, and do not use it before knowing the characteristics of this car (please read carefully for the terms of “danger”, “warning” and “attention”)
    Danger: ignoring this warning can lead to personal accidents. In order to reduce the harm to yourself or others, a special warning must be done or not allowed to do.
    Warning: ignoring this warning can cause damage to the vehicle and its equipment, especially notifying what to do or not to do.
      Note: Ignoring this warning may cause slight damage to the vehicle and its equipment or the vehicle cannot run normally, telling what to do or what not to do.

Special tips for using security

Dear users, for your safety and prevention of safety accidents, please read and follow the following tips:
I, When using electric bicycles, you should abide by traffic regulations and pay attention to driving safety.

  1. It is forbidden for people under 16 years old to drive electric bicycles on the road;

  2. E-bikes should be driven on nonmotorized lanes, lower than the maximum speed
    specified by local laws and regulations.

  3. Do not lend electric bicycles to people who will not operate them to avoid injury;

  4. Electric bicycles shall carry personnel or articles according to laws and regulations;

  5. It is recommended to wear a helmet when riding;

  6. Riding in rainy and snowy days, the braking distance will be prolonged, so pay attention to slow down; Heavy rain and other bad weather, try to avoid traveling.

II, Please pay attention to the safety of electric bicycles.

  1. Electric bicycles should not be parked in the building foyer, evacuation stairs, walkways, and safety exits;
  2. Electric bicycles should not be charged and parked in residential buildings and should be kept away from combustibles when charging, and the charging time should not be  too long;
  3. Correct use and maintenance of battery:
    Please charge the battery for 12 hours for the first time after purchase or long-term storage. When using it normally, charge it for 12 hours every two months. When not in use for a long time, please separate the battery from the vehicle power cord, and supplement every half a month. It is forbidden to short circuit the positive and negative poles of the  input and output terminals of the battery pack; Keep away from children, fire sources, and heat sources, and it is forbidden to put the battery pack into the fire;  Strenuous vibration, impact, and extrusion of the battery are strictly prohibited; Pay attention to waterproof to prevent the battery pack from being exposed to water shower and immersion;
    The battery pack should be charged with use. When not in use for a long time, be sure to remove it from the whole vehicle for storage;
    The battery pack should be stored in a clean, dry, and ventilated place, and should avoid contact with corrosive substances, away from fire sources and heat sources;

Warm tips!

  1. Water inlet is not guaranteed, please use the original charger to charge;
  2. Do not charge in the kitchen, living room, bedroom, and other domestic places;
  3. It is recommended that the battery life cycle be 2 years to avoid damage caused by aging.
    Storage Conditions of battery pack: ambient temperature-20-35°C; Ambient humidity <65%RH. The temperature of battery operation: -10-45 °C.

Warm tips!

  1. Water inlet is not guaranteed, please use the original charger to charge;

  2. Do not charge in the kitchen, living room, bedroom, and other domestic places;

  3. It is recommended that the battery life cycle be 2 years to avoid damage caused by aging.

  4. safe use method of charger:
    • It is forbidden to place any items on the charger;
    • It is forbidden to put any liquid or metal into the charger;
    • It is strictly prohibited to disassemble and modifies the charger;
    • When charging, insert the output of the charger into the charging port of the battery pack first, and then insert the AC power plug of the charger into the Mains socket;
    • It is forbidden to plug and remove the power plug with wet hands;
    • Do not use the charger when thunder and lightning;
    • Do not play with the charger and battery pack when charging;
    • Do not use the charger in unstable, excessive lampblack and dust and excessively humid environments;
    • Keep good  ventilation and heat dissipation conditions when the charger works, and avoid using the charger in direct sunlight;
    • When the output of the charger is not connected to the battery pack, do not connect the charger to the mains for a long time;
    • During the charging process, the indicator light of the charger is red. When the indicator light turns green, continue charging for 2 hours to be fully charged;
    • The normal charging time is 3-10 hours (no more than 12 hours), and the fast charging station is not allowed to charge.
    Note: when replacing the charger, it should match the battery model;
    The special charger provided by our company must be used, and other Chargers are not allowed to charge the battery pack.

  5. Precautions for washing:
    When washing the bicycle, do not directly splash water on the brake drum, motor, and front, and rear axle to prevent water from affecting the service performance and life;
    • Do not use steam or high-pressure water pipes when washing bicycle ;
    • Pay special attention to the working condition of the brake after cleaning the vehicle or driving in the water. After cleaning or driving in the water, the braking effect may
    decrease. At this time, pay attention to safety when driving slowly.

  6. Adjustment of handlebar and saddle (if applicable):
    • When adjusting the handlebar or saddle, be careful not to expose the safety line mark of stem and saddle pipe;
    • After adjusting the horizontal pipe, stem, saddle, and saddle pipe pay attention to fastening, and the recommended torque is 18N.m.
    Danger: waste batteries shall not be dismantled without authorization, and shall not be discarded at will to avoid environmental pollution; The waste batteries of this  product shall be recycled by the enterprise or distributors or government-designated outlets

Precautions before riding

Dear users, for your safety and to prevent safety accidents, please do the following checks before riding. If there is any abnormality, please repair it in time or find a professional repair!

  1.  Inspection of power supply circuit and lighting circuit: • Check whether the power supply circuit, lighting circuit and device are damaged; Turn on the power supply, operate the lighting switch, check whether the headlights and taillights are on, and whether the brightness of the headlights and taillights is normal; • Check the front and rear brake handlebars respectively to check whether the stop lamp is on and whether the motor is powered off; • Operate steering lamp switch to check whether the steering indicator and turn signal are working properly.

  2. Check of brake device:
    • Check whether the front and rear brakes can work normally; Check the braking effect of the front and rear brakes to ensure that the brakes are normal and effective;
    • Confirm whether the power-off switch is normal when the rear wheels are off the ground with double support of the whole vehicle;
    • Please check the fastening status of each axle to ensure that the front and rear axles and handlebars are fastened reliably.

  3. Check the fastening status of the handlebar and front and back wheels:
    • Shake the handlebar up, down, front, back, left, and right to check whether it is loose or pongee;
    • Shake left and right front and back wheels to check whether there is looseness; Whether the rotating wheel is too tight or stuck.

  4. Tire inspection:
    • Check whether the tire pressure is normal. Judge whether the air pressure is appropriate according to the depression of the ground part of the tire. When the air pressure is abnormal, use the tire pressure measuring instrument to check and adjust it to the normal air pressure;
    • Whether the tire has cracks or abnormal wear;
    • Whether the tire is embedded with nails, stones, and glass;
    • When the tire is used to the tread wear mark, the tire should be replaced.

  5. Inspection of the reflector and license plate:
    • Check whether the reflector is missing. If it is found missing, contact the after-sales service immediately to reassemble the reflector of the same specification and model, and the installation position should be consistent with the original bicycle.
    • Please do not change the position, modify, disassemble, etc. privately.
    • Before each use, check that the function of the reflector is normal and the surface of the reflector is kept clean.
    • The Reflector device cannot be blocked by luggage, children’s chair, clothes, and other objects, otherwise, it will cause potential safety hazards.
    • Check whether the license plate is installed firmly, whether the number is clear, whether there is any damage or pollution, and if there is any should reinforce, clean, or replace it in time.
    Before each ride, please make sure that the following items: whether the frame lock, vertical tube lock, and seat tube locking fastener are locked, whether the brake system is normal, and whether the tires are full of gas to ensure riding safety!

Adjustment methods of each part

Adjustment of front and rear brake system: (the adjustment method of front and rear brakes is the same)

  1. For the rear integrated disc brake (see figure 3); Adjust the upper and lower nuts of the disc brake to make the spacing between the disc brake and brake caliper 1.5-3mm, adjust the height of the disc brake, and then tighten the nuts.

  2. Front integrated disc brake (see figure 4 ): Adjust the A and B nuts of the disc brake and adjust the height of the disc brake so that the distance between the disc brake and the caliper is 1.5-3mm. If the distance deviates, use the C screw to adjust, and then tighten the nut.
    Note: To ensure driving safety, the brake rubber on the working face is worn to 1/2 of brake rubber, a new brake rubber should be replaced.
    DUOTTS 291 Electric Bike - methodsRotate the Adjusting nut to rotate the Adjusting nut forward, the brake becomes tight, otherwise, it becomes loose. When adjusting, hold the brake handle at the same time,  so that when the position of the brake handle is 1/3 of the total stroke, the brake rubber block can be tightly attached to the brake drum. (See figure 5)

  3. Disc brake: (see igure 9 and 10) Key points of disc brake adjustment: there is enough clearance between the disc brake and brake pad (there is no interference between the brake disc and the brake skin when rotating, and the best braking effect is appropriate) adjust the nut, lengthen about brake cable, check whether the brake handle has been adjusted to the appropriate tightness; Then test ride to ensure effective and normal braking.
    DUOTTS 291 Electric Bike - methods 1

II . Chain adjustment (see figure 6)

  1. Loosen the rear axle left and right fastening nuts, adjust the chain regulator, move the rear wheels back and forth, and tighten the tightness of the chain so that the sag in the middle of the chain is 10-15mm. At this time, the tightness of the chain should be suitable for go slick, with no abnormal sound.
  2. Keep the center surface of the rear wheel basically in the center surface of the frame, and tighten the rear axle left and right fastening nuts. (Recommended torque is not less than 30N. m)

III. Front wheel disassembly (see Figure 7)

  1. Loosen the left and rear fastening thread of the front axle, remove the nut, remove the front axle, and remove the front wheel.
  2. When assembling, align the center hole of the front wheel with the double arm hole of the hydraulic front fork, penetrate the front axle into the hole, and tighten the left and right fastening nuts of the front axle clockwise. After installation, rotate the front wheel, and there shall be no stuck or loose phenomenon. (The recommended torque is not less than 18N. m)

IV. Rear wheel disassembly (see Figure 8)

  1. Pull the motor cable off the connector, turn the car body over (note: Do not touch the handlebar, head cover, or toolbox parts), rotate the rear axle nut, rear brake positioning nut, and brake cable in the counterclockwise direction, unpack the chain joint, and then remove the rear wheel in the direction of the opening.

How to charge the battery

DUOTTS 291 Electric Bike - charge the battery

Note: Before using the bicycle, insert the key and turn it counterclockwise by 45°, the battery is activated. Finished using the bicycle, turn the key 45° clockwise, the battery is powered off, and take out the key. Remove the battery step, insert the key, press it upward, and then rotate it 90° clockwise. Note that need to remove the key and then take out the battery to avoid damaging the key. VI. Battery installation
The battery is mainly composed of two pieces, cell and protection board PCM (power battery is generally called a battery management system BMS). The cell is equivalent to the heart of the battery, and the management system is equivalent to the brain of the battery. The cell is mainly composed of positive electrode material, negative electrode material,  electrolyte, diaphragm, and Shell, while the protection board is mainly composed of a protection chip (or management chip), MOS tube, resistor, capacitor, PCB board, etc. Open the fixed lock with the key, Dial off the power plug, take out the battery, instead, insert the power plug, lock the battery lock, and confirm that it is safe and firm before riding.

Instructions for use of the instrument

VII. Instructions for using the code table:

  1. Press the POWER button three seconds to start. And press the button for three seconds to close.
  2. After starting up, press the POWER button to switch to display the total mileage, single mileage and battery voltage.
  3. Press the “+” or”-” button for a long time to enter the mode setting; Control the gear, Increase/decrease one gear every time, and follow the 0-5 gear.

DUOTTS 291 Electric Bike - Control the gear,

Electric bicycle fault inspection and troubleshooting methods

Serial
Number| Fault description| Failure cause analysis –| Troubleshooting methods
---|---|---|---
1| Speed regulation failure or speed less than
10 knit| 1, Low battery voltage
2, Speeder failure
3, Transmission Group failure| 1, Fully charge the battery 2,Send to a maintenance station for repair
2| Hub motor does not work after power on| 1, Loose battery wiring
2, Motor wiring plug loose koff 3, Speeder failure| 1 Jake out the battery box and hang it up.
2. Fastening wiring plug
3. Send to a maintenance station for repair
3| Insufficient mileage after charging| 1, Insufficient tire pressure
2, Insufficient charging or charger failure 3, Battery aging or damage
4, There are many uphill (strong headwinds V heavy load l poor road low temperature| 1Sufficient gas
2, Sufficient power or check the charger
3, Replace the battery
4, It is recommended to use pedal assist
4| Charger not charging| 1. The plug is not inserted properly
2, Charger fuse blown
&Battery pack fuse blown| 1, Fastening socket
2, Send to repair station for replacement
&Replace fuse
5| The battery has sufficient power but no voltage indicates that the electric wheel hub is difficult to| 1. When starting the electric hub. the voltage is lower than 30V
2, Battery switching line fall off 3, Monitor connector lose
4, Controller failure| 1,Replace new battery 2,Reconnection fastening
3, Send to a maintenance station for repair
6| After opening the electric door lock, it i found that the signal part is normal and the driving part is abnormal.| 1. Battery Undervoltage; 2. Left and 1. Replace motorcycle handlebar right brake handle damage and repair lines
3. The controller or motor is damaged’2, Timely charging
4. Abnormal line 3 Replace left and right brake
5. Motorcycle handlebar damage or handle line difference 4, Replace controller or motor
7| Abnormal zero start mode (switch left and right disk)| 1, The startup mode switch or Replace damaged parts/
The motorcycle handlebar is damaged. maintenance times
2, Abnormal line
8| Non-zero startup mode exception (switch in the middle)| 1, Incorrect start•up tax switch overlap Check switch position/replace or booster damage booster/overhaul line
2, Abnormal line

Note: When a fault that cannot be eliminated by yourself or a fault that cannot be determined, the internal damage of the motor, controller, charger, battery pack, etc, please send the vehicle to the place of purchase or the company’s special maintenance station for inspection and maintenance. During the warranty period, please do not open important parts without authorization, otherwise, the company will not guarantee.
More professional services Welcome to our local specialty store for a consultation

Maintenance and Repair

Daily maintenance:

  1. The vehicle should be kept clean and clean, and the vehicle should be wiped with a dry cloth in time after being drenched to avoid rusting of parts and short circuits of electrical components.

  2. Always check the air storage capacity of the tire to keep it in normal use.

  3. The main transmission parts such as the front axle, rear axle, center axle, front fork, Flywheel, and the electric hub should be checked and adjusted frequently to keep the transmission parts flexible without impact sound and noise; Check the screws and nuts of the whole car, if it is found that it is loose, it should be tightened in time to prevent the parts from being worn out or causing greater damage and fracture due to looseness.
    Note that the tightening torque of the front wheel, handlebar core screw rod, saddle pipe clamping Bolt, and saddle clamping Bolt shall not be less than 18N.m; The tightening  torque of the rear wheel, bottom bracket Cup, and bottom bracket Cup lock nut shall not be less than 30N.m

  4. The braking part should be checked and adjusted frequently to make it in a flexible state, for example, the gap between the brake rubber and the gate core should not be  too large

  5. Always check whether the operating parts and cable are flexible, ensure that there is no stagnation, no stagnation, and properly drip lubricating oil from one end of the  ose slowly, and pull the wire rope at the same time, feel that the wire rope slides lightly in the hose

  6. Electric bicycle moving parts should be often injected with a small amount of lubricating oil to reduce wear and keep riding light, as shown in the following table:

Lubrication part Lubricant Lubrication cycle
Front axle. center axle. a rear axle nearing 3# calcium-based lubricating
oil Six months to one year
front fork headset 3# calcium-based lubricating oil Half a year
Pedal bearing 3 pieces of calcium-based lubricating oil Half a year
Chain 30# mechanical oil Half a month
Double support locking plate. side support aria transmission parts 30 and
mechanical oil Half a month
Name andle onzontal ube

Center shaft nut
running torque| 18N. m| 18N. m| 18N. m| 18N. m| 18N. m| 30N. m| 30N. m

Regular maintenance:

Location Method Time
Center shaft Meena? ts fit %%grid icon es te on d°01-2c. asset; . e Check

frequently/once every year
Front and rear wh I| ecteweeswing, soetension, soes, moterkfor am.Ash-h – -1 r| he first month/year after the first
brake cable| t here is a step wire at t root oteromgea. . tnre. ace new brake time.| Once every month
brake handle| fuses an ion pose ion an• Cece rese performance.| Once every three months
Chain| heck whether tip shaft is loose or bulging, and whether e extensi not tals| Once every six months
Front and rear nut, handlebar core screw, saddle clamping screw| Check for looseness| Once every six months

Correct use and maintenance methods of motor, controller, and battery:

  1. The motor should be kept clean, no foreign matter, corrosive liquid, gas, etc. should enter the motor and the motor Shell should not be knocked and baked to avoid damage to the motor.
  2. All wires should avoid friction and contact with sharp metal, and the wires should be tied firmly to the frame.
  3. The controller is a high-tech intelligent computer memory program password. If the user opens the repair by himself, the components will be easily damaged. If the controller fails, please go to the service department to repair it.
  4. This battery is a special battery for electric bicycles. When the electric bicycle is not used for a long time, the battery should be stored after sufficient electricity, and the electric energy should be replenished regularly to avoid battery vulcanization caused by long-term underpower.
  5. The battery cannot be near open flame or high-temperature heat source, and the battery cannot be thrown into a fire. Direct exposure to the sun is strictly prohibited in hot and hot weather.

DUOTTS 291 Electric Bike - helmetDUOTTS 291
Electric Bike - helmet 1DUOTTS 291
Electric Bike - TensionDUOTTS 291
Electric Bike - Tension 1

SAFETY CHECKLIST

Before every ride, it is important to carry out the following safety checks:

  1. Brakes
    •Ensure front and rear brakes work properly.
    •Ensure brake shoe pads are not overworn and are correctly positioned in relation to the rims.
    •Ensure brake control cables are lubricated, correctly adjusted, and display no obvious wear.
    •Ensure brake control levers are lubricated and tightly secured to the handlebar.

  2. Wheels and tires
    •Ensure tires are inflated to within the recommended limit as displayed on the tire sidewall.
    •Ensure tires have tread and have no bulges or excessive wear.
    •Ensure rims run true and have no obvious wobbles or kinks.
    •Ensure all wheel spokes are tight and not broken.
    •Check that axle nuts are tight.
    •If your bicycle is fitted with quick-release axles, make sure the locking levers are correctly tensioned and in the closed position.

  3. Steering
    •Ensure the handlebar and stem are correctly adjusted and tightened and allow proper steering.
    • Ensure that the handlebars are set correctly in relation to the forks and the direction of travel.
    •Check that the headset locking mechanism is properly adjusted and tightened.
    •If the bicycle is fitted with handlebar end extensions, ensure they are properly positioned and tightened.

  4. Chain
    • Ensure the chain is oiled, clean, and runs smoothly.
    • Extra care is required in wet or dusty conditions.

  5. Bearings
    •Ensure all bearings are lubricated, run freely, and display no excess movement, grinding or rattling.
    • Check headset, wheel bearings, pedal bearings, and bottom bracket bearings.

  6. Cranks and Pedals
    •Ensure pedals are securely tightened to the cranks.
    • Ensure cranks are securely tightened to the axle and are not bent.

  7. Derailleurs
    •Check that front and rear mechanisms are adjusted and function properly.
    •Ensure shift and brake levers are attached to the handlebar, shift and brake.
    •Ensure derailleurs, shift levers, and shift and brake cables are properly lubricated.

  8. Frame and Fork
    •Check that the frame and fork are not bent or broken.
    • either If are bent or broken, they should be replaced.

  9. Accessories
    •Ensure that all reflectors are properly fitted and not obscured.
    •Ensure all other fittings on the bike are properly and securely fastened, and functioning.
    •Ensure the rider is wearing a helmet.

  10. Motor Drive Assembly and Throttle
    • Ensure all motor drive components are correctly mounted and functioning properly.

  11. Battery Pack
    • Ensure the batteries are in good operating condition and kept fully charged.

Product Overview

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