niu Kick Scooter KQi3 Service Manual
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niu Kick Scooter KQi3 Service Manual

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Kick Scooter KQi3
Service Manual
Jiangsu Niu Electric Technology Co. Ltd
V1.0.0
1

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Summary of Contents for niu Kick Scooter KQi3

  • Page 1 Kick Scooter KQi3 Service Manual Jiangsu Niu Electric Technology Co. Ltd V1.0.0...

  • Page 2: Table Of Contents

    Contents Foreword Part Names Scooter Identification Overall specifications Parts Removal and Installation Procedure Preparation forehead body dashboard and dashboard cover headlamp handlebar pedal controller and battery pack rear wheel and rear wheel fender folding parts front fork and front wheel Wiring Diagram Fault Codes V1.0.0...
  • Page 3 Niu must be verified. Please make replacement with original electric components made by Niu or equivalents that have corresponding part numbers. We strongly recommend you not to use inferior components.
  • Page 4 A bolt can be placed into a bolt hole for fitness in case of confusion. Important notes 1．Please use original parts made by Niu. Use of components that are not in compliance with design specifications by Niu Company may cause damages to the scooter.
  • Page 5 Importance Safety Notes Make sure that you have completely understood basic workshop operation safety procedures and taken on proper protective clothes and are provided with safety equipment. Extra attention should be paid to the following in the implementation of a maintenance task: Read all the relevant instructions before operation, and make sure that you have •...

  • Page 6: Part Names

    Part Names l Vehicle Diagram with Part Names Front windshield Dashboard Bell Right handlebar grip Left handlebar grip Right disc brake lever Leftdisc brake lever Headlamp Front reflector Reflector Folding parts Front brake Folding latch line Rear tail lamp Lock components Rear wheel fender Foot pad pedal trim...

  • Page 7: Scooter Identification

    Scooter Identification Vehicle serial number (SN) is in the user manual • The scooter frame identification code (VIN) is made inside the frame. • The motor code is made at left side of the wheel-hub motor. V1.0.0...

  • Page 8: Overall Specifications

    Overall specifications： Parameter Name KQi3 Pro KQi3 Sport Remarks Length 1,173mm 1,173mm Width 541.5mm 541.5mm High 1,202mm 1,202mm Length after folding 1,173mm 1,173mm Width after folding 541.5mm 541.5mm Height after folding 504mm 504mm Axle distance 890mm 890mm Ground clearance 76mm 76mm Pedal height 169mm...
  • Page 9 Overall specifications： Parameter Name KQi3 Pro KQi3 Sport Allowable height of surface ≤65mm ≤65mm gathered water Operating temperature of -10 - 45°C -10 - 45°C scooter Battery capacity and 486.7Wh (10.4AH) lithium battery 365WH (7.8AH) lithium battery specification Full charging time Usable temperature range (0-40℃) Usable temperature range (0-40℃) Charging temperature range...
  • Page 10 Overall specifications： Structure division KQi3 Pro KQi3 Sport 20.3KG 18.4KG Net weight Weight information 25.6KG (56.4lbs) 23.7KG (52.2lbs) Gross weight Size of front wheel 9.5 inches (241mm) 9.5 inches (241mm) Tyre type Rubber vacuum tyre Rubber vacuum tyre Tyre Inflation pressure 50-60psi (shipping status) 50-60psi (shipping status) disc brake plate...

  • Page 11: Parts Removal And Installation Procedure

    Preparation Section 1 Maintenance qualification: Maintenance personnel must receive proper training . Work environment: Indoor light intensity shall be 1000±200 Lux. The maintenance room must be isolated from daylight. Light must be evenly dispersed and directed vertically from above. The maintenance room must be equipped with fire safety facilities, such as explosion-proof junction boxes, dry powder fire extinguishers, and fire buckets.

  • Page 12: Forehead Body

    forehead body Section 2 2.1 unsrew four Hexagon socket screws Related Screws：M5*14（H2001013） Mount: Follow as the reverse order. 2.2remove the controller harness’line and the dashboard’line Mount: Follow as the reverse order. Insert as per indicated by the waterproof line arrow. V1.0.0...
  • Page 13 forehead body Section 2 2.3 remover the front brake line and rear brake line Mount: Follow as the reverse order. 2.4 remove the forehead body Mount: Follow as the reverse order. V1.0.0...

  • Page 14: Dashboard And Dashboard Cover

    dashboard and dashboard cover Section 3 3.1remover the front windshield:unscrew two Hexagon socket screws Related Screws：M5*12（H2001009） Mount: Follow as the reverse order.There shall be no shaking clearance while shaking the front windshield with one hand . 3.2 remove four silicone plugs，unscrew four Hexagon socket screws Related ScrewsM5*18（H2001006）...
  • Page 15 dashboard and dashboard cover Section 3 3.3 remove the forehead locking cover Mount: Follow as the reverse order.Install upwards as per indicator arrow. 3.4 remove the dashboard cover：tear off the dashboard cover Mount: Follow as the reverse order. V1.0.0...
  • Page 16 dashboard and dashboard cover Section 3 3.5 unscrew three cross screws,remove the dashboard from the forehead body Related Screws：M2*8（H2001008） Mount: Follow as the reverse order. 3.6 cut the fastening tie,remove the harness sleeve Mount: Follow as the reverse order. V1.0.0...
  • Page 17 dashboard and dashboard cover Section 3 3.7 remove the dashboard：remove four connectors Mount: Follow as the reverse order.Press the switch button to power on and check whether the startup is normal. 3.8 separate the forehead body and the handlebar Mount: Follow as the reverse order. V1.0.0...

  • Page 18: Headlamp

    headlamp Section 4 4.1 remove the forehead midhole plug，Notice that the side close to the handlebar shall be with radian, and the rear shall be flat. Mount: Follow as the reverse order. 4.2 unscrew two Hexagon socket screws Related Screws：M5*12（H2001009） Mount: Follow as the reverse order.
  • Page 19 headlamp Section 4 4.3 remove the headlamp wire plug,remove the headlamp Mount: Follow as the reverse order. V1.0.0...
  • Page 20 headlamp Section 4 V1.0.0...

  • Page 21: Handlebar

    handlebar Section 5 5.1 remove handlebar grips：Pull the left and right handlebar grips with force away from the handlebar. Mount: Follow as the reverse order.There shall be no cavity left at the end of the handlebar grips, and the handlebar grips shall be not rotated while screwing the handlebar grips with one hand with force .
  • Page 22 handlebar Section 5 5.2 unscrew the screw,remove the bell Mount: Follow as the reverse order.There shall be no shaking clearance while shaking the bell with one hand; Grip it naturally with one hand, and the bell can be rung easily with the thumb . V1.0.0...
  • Page 23 handlebar Section 5 5.3 remove the Left disc brake lever：unscrew the screw， remove the handlebar threading plug Mount: Follow as the reverse order.Preload the disc brake. V1.0.0...
  • Page 24 handlebar Section 5 5.4 remove the finger control throttle bar ：unscrew the screw，remove thehandlebar threading plug Mount: Follow as the reverse order. V1.0.0...
  • Page 25 handlebar Section 5 V1.0.0...
  • Page 26 handlebar Section 5 5.5 remove the Left disc brake lever ：unscrew the screw Mount: Follow as the reverse order.Preload the disc brake. V1.0.0...
  • Page 27 handlebar Section 5 V1.0.0...

  • Page 28: Pedal

    pedal Section 6 6.1 remove the pedal pad：Tear off the foot pad with force and remove the adhesive from the pedal pad left on the scooter body. Mount: Follow as the reverse order. 1，Wipe the scooter body clean, and there shall be no adhesive residue, water and oil stain and other fouling.
  • Page 29 pedal Section 6 6.2 remove the pedal trim：unscrew eighteen cross screws Related Screws：ST3.5*9.5（H2002005） Mount: Follow as the reverse order. V1.0.0...
  • Page 30 pedal Section 6 K3 pedal long foam K3 pedal short foam K3 pedal short foam K3 pedal long foam 6.3 remove the pedal trim：unscrew twenty Hexagon socket screws and eight cross screws Related Screws：M4*8（H2001001）ST4.2*16 （H2002004） Mount: Follow as the reverse order. V1.0.0...
  • Page 31 pedal Section 6 6.4 remove the lock components：unscrew four cross screws Related Screws：ST4.2*16（H2002004） Mount: Follow as the reverse order. V1.0.0...

  • Page 32: Controller And Battery Pack

    controller and battery pack Section 7 7.1 remove the battery pack：unscrew four Hexagon socket screws Related Screws：M5*18（H2001016） Mount: Follow as the reverse order. V1.0.0...
  • Page 33 Lithium battery Note The Power Lock and Main Switch should be turned off before removal of electronic components. The battery used for this model is a lithium battery. Remove the battery from scooter storage for than a week, Charge the battery to approximately 50% of its capacity and store it at a room temperature.
  • Page 34 controller and battery pack Section 7 controller V1.0.0...
  • Page 35 Lithium battery pro version sport version V1.0.0...
  • Page 36 controller and battery pack Section 7 7.2 remove the controller：unscrew two Hexagon socket screws Related Screws：M5*8（H2001012） Mount: Follow as the reverse order.Apply heat conductive silicone grease on the bottom surface. V1.0.0...
  • Page 37 FOC Controller Main protective functions 1. Current limit protection The maximum controller output current is limited to protect the motor, controller, battery and other components from being damaged by a current greater than specified. 2. Rotation failure (overload) protection The controller judges the motor status automatically in a certain period of time after the motor rotation failure (over-current) occurs.
  • Page 38 controller and battery pack Section 7 7.3 remove the charging assembly：unscrew two Hexagon socket screws Related Screws：M4*8（H2001001） Mount: Follow as the reverse order. 7.4 remove the charging port：unscrew two cross screws Related Screws：ST2.9*13（H2002001） Mount: Follow as the reverse order. V1.0.0...
  • Page 39 controller and battery pack Section 7 7.5 remove the Side Stand：unscrew two cross screws Related Screws：M6*12（H2002001） Mount: Follow as the reverse order. V1.0.0...
  • Page 40 rear wheel and rear wheel fender Section 8 8.1 remove the rear axle trim cover：tear off decorative cover reflective stickers，unscrew two Hexagon socket screws Related Screws：M5*16 （H2001004） Mount: Follow as the reverse order. 8.2 remove the motor：unscrew two Hexagon Nuts Mount: Follow as the reverse order.The motor line shall be on the right.
  • Page 41 rear wheel and rear wheel fender Section 8 Check left side: disc brake plate, flat pad (supplied), anti- rotation gasket (supplied), and lock nut (supplied); The right side : flat pad (supplied), anti-rotation gasket (supplied), lock nut (supplied); The outlet direction of the motor line shall be straight ahead and the anti-rotation gasket facing inward and downward;...
  • Page 42 rear wheel and rear wheel fender Section 8 controller V1.0.0...
  • Page 43 Electrical System Motor The motor used in this scooter is an efficient brushless DC motor with a permanent magnet made of rare earths, which is integrated with the rear wheel. The motor does not require maintenance in daily riding. However, attention should be paid to the status of installation and tightening nuts on the motor shaft.
  • Page 44 rear wheel and rear wheel fender Section 8 8.3 remover the Disc brake caliper：unscrew two Hexagon socket screws Related Screws：M5*16（H2001004） Mount: Follow as the reverse order. 8.4 Loosen the lock nut of the brake line and pull the brake line out from the hole Mount: Follow as the reverse order.
  • Page 45 Brake failure diagnosis The brake performance is not good. The brake is not adjusted properly. The brake pad and brake disc are worn. The brake assembly is not installed properly. The brake pad and brake disc are contaminated. The brake responds slowly or the handle is tight. The brake is not adjusted properly.

  • Page 46: Rear Wheel And Rear Wheel Fender

    rear wheel and rear wheel fender Section 8 8.5 remover the rear wheel fender：unscrew one Hexagon socket screw Related Screws：M4*8（H2001001） Mount: Follow as the reverse order. V1.0.0...
  • Page 47 rear wheel and rear wheel fender Section 8 8.6 remover the tail lamp line guard：unscrew two cross screws Related Screws：ST4.2*13（H2001015） Mount: Follow as the reverse order. 8.7 remover the tail light adapter plate：unscrew two cross screws Related Screws：ST4.2*13（H2001015） Mount: Follow as the reverse order. V1.0.0...
  • Page 48 rear wheel and rear wheel fender Section 8 8.8 remover the rear tail lamp：unscrew one cross screw Related Screws：ST4.2*13（H2001015） Mount: Follow as the reverse order. 8.9 separate the rear tail lamp and the tail lamp adapter line Mount: Follow as the reverse order. V1.0.0...
  • Page 49 rear wheel and rear wheel fender Section 8 controller V1.0.0...

  • Page 50: Folding Parts

    folding parts Section 9 9.1 remove the brake line upper plug and the brake line lower plug,remove the Front brake line,put down the folding parts assembly. Mount: Follow as the reverse order. V1.0.0...
  • Page 51 folding parts Section 9 9.2 unscrew the Folding parts fixed screw Related Screws：M35*1.5（H2001010） Mount: Follow as the reverse order.The Folding parts fixed screw shall be parallel to the red line, otherwise it may not be able to be closed. V1.0.0...
  • Page 52 folding parts Section 9 9.3 remover the folding parts assembly：unscrew two screws Mount: Follow as the reverse order. 9.4 unscrew one Hexagon socket screw，remove the front fork Related Screws：M4*10（H2001014） Mount: Follow as the reverse order. V1.0.0...
  • Page 53 folding parts Section 9 9.5 remove the waterproof foam from the frame,remove the controller harness,rear brake line and the wire guard spring, separate the frame and the front fork. Mount: Follow as the reverse order. V1.0.0...

  • Page 54: Front Fork And Front Wheel

    front fork and front wheel Section 10 10.1 From the bottom to the top, successively they are: the direction bearing bead assembly, the dust ring , lower head upper plug and the opening holding ring, the spherical surface shall face downwards Mount: Follow as the reverse order.
  • Page 55 front fork and front wheel Section 10 10.2 From the bottom to the top, successively they are: lower head bowl plug, the dust ring, the direction bearing bead assembly, the spherical surface shall be kept facing upwards, and the lower head bowl plug needs to be pressed on the front fork.
  • Page 56 front fork and front wheel Section 10 10.3 tear off front reflective stickers,unscrew two Hexagon socket screws,remove front axle trim covers Related Screws：M4*10（H2001014） Mount: Follow as the reverse order. 10.4 remover the front fork protection cover：unscrew two Hexagon socket screws Related Screws：M4*8（H2001001）...
  • Page 57 front fork and front wheel Section 10 10.5 remover the bottom cover：unscrew four Hexagon socket screws,Break off 5 pairs of buckles. Related Screws：M4*8（H2001001） Mount: Follow as the reverse order. 10.6 remover the self-tapping screw plate：Straight upwards to remove the card Mount: Follow as the reverse order.The flat side shall be outward V1.0.0...
  • Page 58 Charger Overview The charger will be generate heat during charging. It should be subject to good ventilation and radiation. The battery and charger must not be covered. They must not be close to flammable or explosive objects in charging to avoid the explosion or fire that may cause personal injuries.

  • Page 59: Wiring Diagram

    Wiring Diagram V1.0.0...

  • Page 60: Fault Codes

    Fault Codes Dashboard Display and Screen Display in the Event of a Vehicle Fault V1.0.0...
  • Page 61 Fault Codes and Corresponding Measures Description of Fault Measure Controller MOSFET fault Please contact after-sales service Please check the status of the brake handle or Brake fault contact after-sales service Please check the throttle switch status or Throttle failure contact after-sales service Controller overcurrent Please contact after-sales service Let the vehicle stand and use only after internal...
  • Page 62 V1.0.0...

This manual is also suitable for:

Kqi3 proKqi3 sport

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