Yadea Y1S Series User manual

YADEA Y1S SERIES 2021 EDITION
ELECTRIC MOTORCYCLE Y1S
SERVICE MANUAL
YADEA TECHNOLOGY GROUP CO., LTD.
ALL RIGHTS RESERVED. NO COPY OF THIS MANUAL MAY
BE REPRODUCED WITHOUT WRITTEN CONSENT OF YADEA
TECHNOLOGY GROUP CO., LTD.
THIS SERVICE MANUAL IS INTENDED FOR MODELS
YD-EM279
PREMIUM E-MOBILITY

YD-EM279
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Table of Contents
1.General information ……………………………………………………………03
1.1 Warnings and precautions ………………………………………………………03
1.1.1 Description…………………………………………………………………………………… 03
1.1.2 Warning label ……………………………………………………………………………… 03
1.2 Notes for disassembly ……………………………………………………………03
1.2.1 Parts disassembly ………………………………………………………………………… 03
1.2.2 Parts cleaning ……………………………………………………………………………… 03
1.2.3 Parts check ………………………………………………………………………………… 03
1.3 Inspection and maintenance………………………………………………………04
1.3.1 Inspection item ……………………………………………………………………………… 04
1.3.2 Inspection cycle …………………………………………………………………………… 04
1.4 Technical parameters ………………………………………………………………05
1.4.1 Vehicle dimensions ………………………………………………………………………… 05
1.4.2 Product Information ……………………………………………………………………… 06
1.4.3 Configuration Information ………………………………………………………………… 06
1.4.4 Tightening torque table for key parts of the vehicle …………………………………… 07
1.5 Vehicle identification number ……………………………………………………08
1.5.1 VIN code……………………………………………………………………………………… 08
1.5.2 Motor model ………………………………………………………………………………… 08
1.5.3 Vehicle Code ………………………………………………………………………………… 08
2.Power system ……………………………………………………………………09
2.1 Motor …………………………………………………………………………………09
2.1.1 Overview……………………………………………………………………………………… 09
2.1.2 Assembly overview ………………………………………………………………………… 09
2.1.3 Disassembly and installation of motor …………………………………………………… 10
3.Electric system …………………………………………………………………14
3.1 Charger ………………………………………………………………………………15
3.1.1 Overview……………………………………………………………………………………… 15
3.1.2 Charger protection functions ……………………………………………………………… 15
3.1.3 Connector interface definition …………………………………………………………… 16
3.1.4 Charger fault maintenance determination method …………………………………… 17

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3.1.5 Fault diagnosis and troubleshooting steps: …………………………………………… 17
3.2 Electric appliance……………………………………………………………………19
3.2.1 Assembly overview ………………………………………………………………………… 19
3.2.2 Overview……………………………………………………………………………………… 19
3.2.3 Disassembly and installation of lithium battery ………………………………………… 20
3.2.4 Disassembly and installation of controller ……………………………………………… 22
3.2.5 Disassembly and installing the immobilizer …………………………………………… 25
3.2.6 Disassembly and installation of air switch ……………………………………………… 27
3.2.7 Disassembly and Installing the Converter (Integrated USB) ………………………… 28
3.2.8 Disassembly and installation of GPS positioner………………………………………… 29
3.2.9 Disassembly and installation of horn …………………………………………………… 30
3.2.10 Disassembly and installation of USB interface ………………………………………… 32
3.2.11 Disassembly and installation of mirrors ………………………………………………… 32
3.2.12 Disassembly and installation of instrument……………………………………………… 33
3.2.13 Disassembly and installation combination switch ……………………………………… 34
3.2.14 Disassembly and installation the handlebars …………………………………………… 35
3.3 Lighting ………………………………………………………………………………37
3.3.1 Assembly overview ………………………………………………………………………… 37
3.3.2 Disassembly and installation of headlight ……………………………………………… 37
3.3.3 Disassembly and installation the headshade …………………………………………… 39
3.3.4 Disassembly and install the logo lamp…………………………………………………… 39
3.3.5 Disassembly and installation the front turn signals lamp ……………………………… 40
3.3.6 Disassembly and installation the rear turn signals lamp ……………………………… 41
3.3.7 Disassembly and installation of rear tail lights ………………………………………… 42
3.3.8 Disassembly and installation of post-license plate lamps …………………………… 42
3.4 Wiring harness ………………………………………………………………………43
3.4.1 Overview……………………………………………………………………………………… 43
3.4.2 Assembly overview ………………………………………………………………………… 43
3.4.3 Disassembly and installation of cable …………………………………………………… 43
4.Body system ………………………………………………………………………45
4.1 Brackets ………………………………………………………………………………45
4.1.1 Assembly overview ………………………………………………………………………… 45
4.1.2 Disassembly and installation of side support …………………………………………… 45

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4.1.3 Disassembly and installation of main support ………………………………………… 46
4.1.4 Disassembly and installation of rear armrests ………………………………………… 46
4.1.5 Disassembly and installation the Flat Fork ……………………………………………… 47
4.1.6 Disassembly and installation of the backrest bracket ………………………………… 48
4.1.7 Disassembly and installation rear footrest ……………………………………………… 48
4.1.8 Disassembly and installation of the seat cushion lock plate ………………………… 49
5.Body trim …………………………………………………………………………50
5.1 Exterior trim …………………………………………………………………………50
5.1.1 Assembly Overview ………………………………………………………………………… 50
5.1.2 Disassembly and installation of front fender …………………………………………… 50
5.1.3 Disassembly and installation of front wall ……………………………………………… 51
5.1.4 Disassembly and installation of front wall ……………………………………………… 52
5.1.5 Disassembly and installation of the storage box ……………………………………… 53
5.1.6 Disassembly and installation of lock set ………………………………………………… 54
5.1.7 Disassembly and installation Hooks ……………………………………………………… 54
5.1.8 Disassembly and installation of pedal …………………………………………………… 55
5.1.9 5.1.9 Disassembly and installation the rear strip ……………………………………… 56
5.1.10 Disassembly and installation the Center Cover ………………………………………… 57
5.1.11 Disassembly and installation the Center Hood ………………………………………… 57
5.1.12 Disassembly and installation of seat cushions ………………………………………… 58
5.1.13 Disassembly and installation of the seat barrel ………………………………………… 58
5.1.14 Disassembly and installation of rear seat cushions Service tools …………………… 59
5.1.15 Disassembly and installation the shelf cover …………………………………………… 59
5.1.16 Disassembly and installation of shelf baseplates ……………………………………… 60
5.1.17 Disassembly and installation of shelf side panels ……………………………………… 60
5.1.18 Disassembly and installation the side panels …………………………………………… 61
5.1.19 Disassembly and installation 后挡泥板…………………………………………………… 62
5.2 Interior trim parts ……………………………………………………………………63
5.2.1 Assembly overview ………………………………………………………………………… 63
5.2.2 Disassembly and installation of the front inner fende ………………………………… 63
5.2.3 Disassembly and installation of the frame baseplate ………………………………… 66
5.2.4 Disassembly and installation Inner fender after………………………………………… 66
6.Chassis ……………………………………………………………………………67

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6.1 Suspension system …………………………………………………………………67
6.1.1 Overview……………………………………………………………………………………… 67
6.1.2 Assembly overview ………………………………………………………………………… 67
6.1.3 Disassembly and installation Shock absorption prior to ……………………………… 67
6.1.4 Disassembly and installation of rear shock absorber ………………………………… 70
6.1.5 Steering control system …………………………………………………………………… 73
6.1.6 Disassembly and installation the cover under the instrument cover ………………… 73
6.1.7 Disassembly and installation the Instrument Cove …………………………………… 73
6.1.8 Disassembly and installation the Instrument Cover …………………………………… 74
6.1.9 Disassembly and installation of the steering handle…………………………………… 74
6.1.10 Disassembly and installation of steering bearings …………………………………… 75
6.1.11 Disassembly and installation of the front wheels ……………………………………… 75
6.1.12 Disassembly and installation of front wheel …………………………………………… 76
7.Braking system …………………………………………………………………77
7.1 Overview………………………………………………………………………………77
7.2 Assembly overview …………………………………………………………………77
7.3 Front brakes …………………………………………………………………………77
7.3.1 Disassembly and installation the front brake disc brake pump ……………………… 77
7.3.2 Front brake composition…………………………………………………………………… 78
7.3.3 Brake main pump exploded diagram …………………………………………………… 79
7.3.4 Breakdown drawing of master cylinder ………………………………………………… 79
7.3.5 Disassembly and installation of disc brake of front brake …………………………… 82
7.3.6 Breakdown drawing of caliper …………………………………………………………… 83
7.3.7 Disassembly and installationl the front brake disc disc ……………………………… 87
7.3.8 Service tools ………………………………………………………………………………… 87
7.3.9 Disassembly and installation ……………………………………………………………… 87
7.4 Disassembly and installation Rear Brake Disc Disc …………………………89
7.4.1 Service tools ………………………………………………………………………………… 89
7.4.2 Disassembly and installation ……………………………………………………………… 89
7.5 Disassembly and installation 后制动器 …………………………………………89
7.5.1 Service tools ………………………………………………………………………………… 89
7.5.2 Disassembly and installation ……………………………………………………………… 89
7.6 备用件清单 ……………………………………………………………………………91

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Company profile
Yadea Technology Group Co., Ltd. was established in 1997, has become a global
leader in the development, production and sales of electric bicycles, electric
motorcycles, electric tricycles and their spare parts.
The Group is headquartered in Wuxi, Jiangsu, with production bases in Tianjin,
Guangdong and Zhejiang. And has a vehicle enterprise only - national testing
center, the total area of 1300 mu, the annual production capacity of more
than 6 million vehicles, Yadea to a steady pace to maintain rapid growth, for
eight consecutive years, an increase of over 30%; The sales volume of 2014
is expected to exceed 10 billion, 503 million in 2018, 6 million in 2019 and 10
million in 2020.
Yadea products with excellent quality exports to five continents, bestselling
France, the United States and other 77 countries around the world. As the
representative enterprise of new energy transportation, Yadea has helped
Shanghai World Expo and London Olympic Games, and won the "2012
Outstanding Contribution Award for Preparing for the Olympics in London."
Adhere to the leading technology innovation, innovation as the driving force, Yadi
continuously innovate the comprehensive value of products, the first through the
3C safety quality certification and the European Union CE certification, E. - MARK
certification and other global quality certification, access to GE high-energy
power system, anti-freeze wall silicone battery and other 128 national patents,
leading the industry's technology transformation and upgrading.
Yadea to manufacture products to make consumers happy as a corporate
mission, in the development of enterprises at the same time concerned about
supporting public welfare undertakings, hand in hand with Zhejiang Satellite
TV and other media, the establishment of a million dream public welfare fund,
dedication "Project Hope", was awarded the National Hope Project Contribution
Award.
In the future, Yadea will continue to promote the development of China's new
energy transportation industry, and become an international enterprisegroup with
global competitiveness in the electric vehicle industry.

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This manual is a service manual for Y1S models.
Vehicle used: YD-EM279
All information in this manual is current and subject to change without
notice. If you have any questions, please contact us at e-mail:
[email protected]
When it is necessary to replace parts, please use the parts recommended
by our company. Our distributors must only provide parts recommended by
the Company.
The copyright of this manual belongs to yadea Technology Group Co.,
Ltd., and it is not allowed to reproduce and reproduce without the written
consent of the company.
This manual does not cover everything required for repairs. This manual
has been prepared for persons with specialized technical and certification
qualifications. If a non-professional or uncertified technician uses this
manual or repairs without proper equipment and tools, there is a risk that
you or those around you will be seriously injured and the customer's vehicle
may be damaged.
This manual provides information about all models, due to different model
configurations, the introduction of this manual and the actual configuration
of the model you purchased may be different, please refer to the actual
model.

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1 General information
1.1 Warnings and precau-
tions
Warning, caution and tips
"Warning", "Caution" and "Tips” mean the following:
Warning: Procedures must be strictly followed to
avoid possible injury to personnel.
Caution: Draw your attention to follow procedures to
prevent damage to components.。
Tips: Provide some helpful information.
1.1.1 Description
Please use the parts recommended by the Company
only when required.
Pay special attention to the following points, which are
related to the maintenance or replacement of parts:
●Use of parts other than those recommended by the
Company may weaken the safety factor and anti -
corrosion measures of the vehicles. In some areas, it is
legally prohibited to use any parts beyond the manu-
facturer's specifications.
●Torque values given in this manual must be followed.
Locking devices, when specifically specified, must be
installed. A locking device must be replaced if its lock-
ing effect is affected after disassembly.
●The accessories, purchased by the user while travel-
ing in a foreign country, and their installation sites shall
comply with legal requirements.
●The vehicle warranty does not apply to the parts not
recommended by the Company. All parts recommend-
ed by the Company can enjoy the vehicle warranty. Our
dealers must supply only the parts and components
recommended by us.
1.1.2 Warning label
Warning: Read the high - pressure warning label in-
structions carefully before working
This part is a high voltage part with high volt-
age risk. The user is prohibited to touch this
part at will, so as not to cause electric shock
and other casualties.
Danger: Ignoring the text can lead to accidents
or injuries to passengers and drivers.
Warning: Ignoring the warning can lead to se-
rious injury or death.
Caution: You must strictly observe the matters
stated here, otherwise it may damage your
vehicle.
Environmental protection: the matters
stated here are related to environmental
protection.
1.2 Notes for disassembly
1.2.1 Parts disassembly
Disassembly
Parts and surrounding area shall be cleaned as
much as possible prior to disassembly.
●Empty space shall be covered after parts disas-
sembly.
●The disassemblyd parts shall be quickly placed in
the appropriate containers, and each part and its
related parts are placed in different containers by
class.
Clean the workbench and prepare marking ma-
terials, labels, and containers before parts dis-
assembly
Caution:
The parts, especially brake, shall be kept clean
during disassembly. The tiny dirt and cloth
pieces left in these parts may result in vehicle
faults.
●The parts to be replaced and the parts to be
checked and installed shall be labeled respective-
ly and placed in separate containers.
●Do not discard any parts to be replaced. Com-
pare them with the new parts first to see if you've
got the right parts.
1.2.2 Parts cleaning
The recommended cleaning agent or similar
products shall be used. Attention shall be paid
to adequate ventilation when using a solvent
for grease removal. Do not use grease removal
equipment that can damage parts.
1.2.3 Parts check
All parts shall be checked for damage or wear be-
fore installation.
Do not check for damage or measure the size if
the parts are clean.
A small amount of grease can cause great dam-
age to the vehicle.

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1.3 Inspection and maintenance
1.3.1 Inspection item
nspection item Inspection content
Headlamp, direction - indicator lamp, tail lamp and
stop lamp Normal working
Horn Normal sound when working
Brake clearance between front and rear brakes Normal braking
Front and rear tires Normal tire pressure, sundries or wear on the sur-
face
Instrumentation Normal signal lights and indicators
Power lock and cushion lock Normal opening and the need for lubricating the
moving parts of the locking plate
Rearview mirror angle A clear view of the rear
Handlebar and front fork Flexible rotation, looseness or clamping stagnation
Fasteners for front and rear axles, rear fork shaft,
etc ooseness
1.3.2 Inspection cycle
Inspection item Every-
day 60 days 180 days
360
days
1. Whether the rotating and steering parts of the handlebar are
loose and worn █● █● ●▲
2. Whether the tire is properly inflated and the outer tire is
worn ● ◆
3. Whether the bulb is on █◆ █◆ █◆ █◆
4. Whether the brake rubber block is worn ◆ ◆
5. Whether the rim is swaying or deformed ██◆
6. Whether the front shock absorber of the frame is deformed ██◆
7. Whether the fasteners are loose █ █▲ ▲
8. Whether the brakes are in good condition █ █▲ █▲ ▲◆
9. Whether the horn is on █ ▲◆
10. Whether the power cord of the charger is worn █ ◆
11. Parts connected with the frame, such as front tube, rear
fork and shock absorber

█ Check ▲ Adjust ◆ Replace Lubricate
Caution:
●For vehicles for family use, the maintenance cycle shall be carried out as specified in the table above.
●For vehicles not for family use (e.g. operation, commercial use, corporate collective, group purchase, lease),
the maintenance cycle shall be carried out as half of that specified in the table above

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1.4 Technical parameters
1.4.1 Vehicle dimensions
Length: 1915（mm）
Width: 670（mm）
Height: 1125（mm）
Center distance between front and
rear wheels: 1333（mm）
670（mm）1125（mm）
1915（mm）
1333（mm）

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1.4.2 Product Information
Product units Electric motorcycle Status New
Product model YD-EM279 Model name Y1S
Export country Italy Customer name/code
name 19000304
VIN(frame number) ☆LR4F0NJ0*M*******☆
Color Snow beads white
1.4.3 Configuration Information
Configuration type
Configuration type
Basic configuration
72V20AH 12-inch front/rear disc brake electric
motorcycle
Performance/
Parameters
Torque (N·m) 130(N·m)
Maximum speed (Km/h) 45Km/h
Mileage (Km) 100km/h
Vehicle mass (without battery) 82kg
Battery weight 21.6*2㎏
Load mass (weight) 85㎏/92㎏
Electrical systems
Motor 1800W
controller 18tube controller
Anti-theft device AQ alarm
Voice announcer Not included
Governor 2 gears
appearance Digital meters
Sleeve lock Mechanical key Solenoid valve two lock
converter bring
Main cable CAN twisted pair waterproof connector Lithium
battery 60V knob lock interface IOT interface
Headlights LED
Battery type lithium battery
capacity 24AH
Motor form BRUSHless DC
Rated continuous output
power ≤1800W
Rated speed 533r/min
Rated voltage 60V
Rated output torque ≥15N.m
Undervoltage protection value 52.5V
Overcurrent protection value 55A

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1.4.4 Tightening torque table for key parts of the vehicle
Fastener name Thread diameter Tightening torque (N·m)
6.8（6） 8.8（8）
Bolt, Nut
M4 2～3 2～3
M5 3.5～6 4～7
M6 6～9 7～11
M8 16～21 18～25
M10 28～36 30～40
M10×1.25 32～40 35～45
M12 42～52 45～55
M12×1.25 48～56 50～60
M14 60～70 55～65
M14×1.5 70～75 70～75
M14X1.25 80～85 80～85
Screw
M4 1～2 1.5～2.5
M5 3～5 3.5～5.5
M6 5～8 6～10
M8 15～20 16～23
M10 22～28 25～30
Caution:
●The torque value of the screw is applicable to the screw on the cover. The torque value of the bolt is appli-
cable to the connection of iron parts.

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1.5 Vehicle identification number
1.5.1 VIN code
VIN position: Located on the right side of the frame.。
1.5.2 Motor model
Motor model position:
Located in front of the rear wheel.
1.5.3 Vehicle Code
Vehicle code location:
Located on the rear frame of the storage bin.

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2 Power system
2.1 Motor
2.1.1 Overview
A motor is a component that converts electrical energy into mechanical energy to drive an electric wheel to rotate.
The motor used in electric vehicles has many kinds of medical structure, speed range and electrification form. Com-
mon motors are: brush and geared wheel hub motor, brush and gearless wheel hub motor, brushless and gearless
wheel hub motor, brushless and geared wheel hub motor, and side - mounted motor.
2.1.1.1 Composition of powertrain assembly
The powertrain of Y1S series electric two-wheeled motorcycles mainly includes: electric drive unit, energy storage unit
and control unit. The main components are: wheel motor, lithium-ion power battery and integrated vehicle controller.
2.1.1.2 Main features of powertrain
The motor controller is the control unit of the motor, which adopts the cooling mode of natural air cooling,
completes the energy conversion transmission between the power battery pack and the driving motor, and
accepts the control instructions sent by the vehicle controller to ensure that the motor works according to
the requirements. In the electric state, the controller converts the high-voltage direct current provided by
the power battery pack into alternating current to drive the motor. In addition, the motor controller also re-
alizes functions such as online calibration and fault diagnosis.
2.1.2 Assembly overview
1. Adjust the pad
2. Bolts
3. Spring washer
4. Nuts
5. Fixing the washer
6. Motor
7. Fixing washer
8. Adjust pads
9. Spring washer
10. Nuts
11. Bolts
G501-0001
9
8
10
6
7
5
242221 23
211

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2.1.3 Disassembly and installation of motor
2.1.3.1 Service tools
●Cross screwdriver
●Straight screwdriver
●Sleeve 8mm
●Sleeve 21mm
2.1.3.2 Disassembly and installation
Disassembly
High voltage risk:
This part is a high voltage part with high voltage risk.
The user is prohibited to touch this part at will, so as
not to cause electric shock and other casualties.
●Park the vehicle on a horizontal road surface to
support the main bracket.
●Close the key and pull it out.
●Open the seat cushion and turn off the air switch.
●Disassembly the shelf cover. → Page 59
●Disassembly the seat barrel. → page 58
●Open the controller harness protection cover -
arrow - .
●Disassembly the bolt and Disassembly the motor
harness - arrow B -.
●Disconnect the motor connector - arrow A -.
●Disconnect the harness fixing clip - arrow - .
A
A
A
B

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●Disassembly Flat fork cover → 88 pages
●Disassembly bolt - arrow - .
●Disassembly nut - arrow A - .
●Disassembly bolt - arrow - .
●Disassembly nut - arrow A - .
●Disassembly the motor.
Installation
Installation is carried out in reverse order of disassembly.
Caution：
●If the motor wiring harness is loosened and the
fixing card is damaged, it needs to be replaced.
A
A

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2.1.3.3 Connector interface definition
Connector Pin color function Pin color function
1 black GND 4 blue Hall signal
2 / / 5 green Hall signal
3 red Power + 6 Yellow Hall signal
2.1.3.4 Motor fault maintenance determination method
Function definition: the motor is a device that converts electrical energy into mechanical energy and
controls the vehicle speed with the controller. Common faults: motor non - rotation (no reaction when
starting), abnormal sound, motor locked (stuck), no load.
2.1.3.5 Fault diagnosis and troubleshooting steps
Motor non - rotation: trun on power lock and rotate the handle. The motor has no response
Fault diagnosis and troubleshooting steps:
Motor non - rotation: trun on power lock and rotate the handle. The motor has no response
(1) Motor Hall check:
Measure the Hall plug-in voltage, normal: red line 5V or so turn the motor, Hall voltage is 0 or 4V-5V
(2) Motor phase winding check:
To disconnect first, any short two phases, rotating the motor will have a sense of obstruction as normal
(3) Connecting wire and connector inspection:
Disconnect the power lock for inspection in
power - off status.
Connector appearance: no dirt, damage,
fracture, no dirt or oxidation in the internal
insert
Conductor appearance: conductor insulated
leather is free of damage and fracture.
Abnormal
Repair or replacement
Normal
Judge OK
Abnormal sound: trun on power lock, rotate the motor without load, and listen to whether there is ab-
normal sound.
(1) Bearing and oil seal inspection:
Failure of oil seal after long - term use, ab-
normal sound in the damaged bearing and
internal foreign bodies of the motor.
Abnormal
Repair or replacement
Normal
Judge OK
2
36
5
14

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(2) Motor locked (stuck):
Disconnect the power lock and the cable for
inspection in power - off status. Rotate the
motor manually to check the rotation of the
motor
Stuck
Check the brake
Non - stuck
Abnormal controller. Replace the controller
and repeat the inspection as above.
(3) Brake check:
Disconnect the power lock and the cable
and release the brake for abnormality in
power - off status
Stuck
Judge brake OK
Non - stuck
Abnormal motor. Check the motor
No load: normal no - load and weak riding
Disconnect the power lock and check
whether the motor terminal ca-
ble and controller fastening screws
are loose in the power - off status;
Check whether the magnetic steel falls off:
whether there is a large abnormal sound
when starting the vehicle under load.
Abnormal
Repair or replacement
Normal
Judge OK

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3 Electric system
General troubleshooting of vehicle
No. Fault
phenomenon
Phenomenon
confirmation Cause analysis Troubleshooting
1Unable to
charge
1. Unable to charge
after riding
2. Unable to ride dai-
ly
1. Charger fault
1. Trun on power lock and check the
charging port for voltage. If there is
no voltage, the battery is faulty
2. Internal fault of battery 2. Internal unrecoverable fault shall
be repaired by the factory
3. Lack of electricity in bat-
tery
3. Test whether the battery output
voltage is within the rechargeable
range
4. Low temperature protec-
tion of the battery in low
ambient temperature
4. Place the battery at room tem-
perature and wait
2
No electricity of
the whole vehi-
cle
No discharging of the
battery
1. Controller MOS pipe short
circuit 1. Overhaul or replace the controller
2. Abnormal battery protec-
tion 2. Overhaul or replace the battery
3. A problem with the main
cable
3. Overhaul the main cable
3
Frequent power
failure during
riding
Return to normal
after replugging
1. The battery temperature
rises too high 1. Check the controller or motor for
leakage or damage
2. Replace battery
2. A large peak current
is detected in the bat-
tery
4Poor battery
contact
The power is on and
off alternatively after
the discharge plug
is plugged and un-
plugged
1. High current short circuit
in the vehicle
1. Check the short circuit source of
the whole vehicle circuit
2. Replace battery
3. Overhaul the discharging port
2. Poor contact of discharg-
ing port
3. The cycle life of the bat-
tery decays
4. The discharge current of
the battery is too high
5
When the pow-
er is switched
on, the motor
hub does not
work
Trun on power lock
and rotate the han-
dle. The motor has
no response
1. The battery wire is loose
without power
1. Repair and reconnect
2. Ask a dealer for repair
2. Left and right brake
handles out of order after
power cut
3. The motor hub wiring
plug is loose or damaged
6Speed regula-
tion failure
1. The spring in the speed
regulating handle is stuck Ask a dealer for repair or replace-
ment
2. Internal Hall element fail-
ure