SUR-RON LIGHT BEE

SERVICE MANUAL
1. Brief Introduction
1.1Safety warning
Do reading the chapter carefully before the repair & maintenance
This service manual is used to guide professional technicians. Please don’t do the repair
and maintenance with the content in this manual neither you take necessary training nor
have any operation experience.
The operations in the manual only can be done in suitable maintenance workshop. Ensure
all essential tools are well prepared before the repair and maintenance.
The power source of LIGHT BEE must be cut off before any operation on the bike. The
failure to cut off its power source may cause serious injury and even death through electric
shock or disassembly and assembly of parts.
When you do the repair and maintenance, please do wear the required cloth and shoes in
case of burning, cutting, collision or other accidents. And use protective goggle or gloves if
necessary.
Chongqing Qiulong Technology Co., Ltd (Hereafter called Sur-Ron) has the power of
interpretation for all information in the manual. Sur-Ron aimed to build the best electric
bike in the world, therefore, any improvements, which can make the bike have better
performance and quality, Sur-Ron will keep doing improvements. If any content missed in
this manual, or finally the bike you got is a little different from the description of this
manual, please check with the local importer or dealer before you do the repair and
maintenance.
1. Brief Introduction
1.1 Safety warning
1.2 Use of the manual
1.3 Disclaimer
2. Technical specification
2.1 Bike parameters
2.2 Torque specifications of important screws
2.3 The top speeds under different battery capacities
2.4 Bike composition
3. Bike operation
4. LIGHT BEE repair tools and preparation work
4.1 LIGHT BEE repair tools
4.2 LIGHT BEE fixing
5. Battery dismount and mount
6. Absorber dismount, mount, and adjustment
6.1 Adjust the compression damping of front absorber
6.2 Adjust setting of absorber
6.3 Absorber lubricating
6.4 Front absorber dismount and mount
6.5 Rear absorber dismount and mount
6.6 Disassembly of rear absorber
7. Check, dismount, mount of the headset
7.1 Check stroke gap of headset
7.2 Disassemble the headset
8. Disassemble and assemble handle bar assembly
9. Wheel checking
9.1 Tire checking
9.2 Rim checking
10. Braking system checking and maintenance
10.1 Brake checking
10.2 Maintenance
10.3 Brake lever dismount and mount
10.4 Brake pump dismount and mount
10.5 Brake clipper dismount and mount
10.6 Brake clipper adopter dismount and mount
10.7 Front brake assembly dismount and mount
10.8 Rear brake assembly dismount and mount
11. Bike body dissemble and assemble
11.1 Mid. Bushing dismounting and mounting
11.2 Motor side-cover dismounting and mounting
11.3 Motor side-cover dismounting
11.4 Disassemble and assemble first level transmission belt
11.5 Disassemble and assemble left pedal assembly
11.6 Disassemble left pedal assembly
11.7 Disassemble and assemble right pedal assembly
11.8 Disassemble pedal assembly
11.9 Disassemble and assemble guard plate under electrical machine
11.10 Disassemble and assemble guard plate under controller
11.11 Disassemble and assemble air switch combination
11.12 Disassemble air switch combination
11.13 Disassemble and assemble USB and electric control lock combination
11.14 Disassemble USB and electric control lock
11.15 Disassemble and assemble electrical machine assembly
11.16 Disassemble and assemble tailstock assembly
11.17 Disassemble tailstock assembly
11.18 Disassemble and assemble left and right limited block of battery
11.19 Disassemble and assemble horn
11.20 Disassemble and assemble back shield
11.21 Disassemble and assemble rear wheel assembly
11.22 Disassemble rear wheel
11.23 Disassemble and assemble rear fork
11.24 Disassemble rear fork
11.25 Disassemble rear fender assembly
11.26 Disassemble rear and inner fender
11.27 Disassemble and assemble cover of battery compartment
11.28 Disassemble and assemble lower stop plate of battery
11.29 Disassemble lower stop plate of battery
12. Checking and maintenance of speed regulation control and brake control device
12.1 Check brake
12.2 Check accelerator
12.3 Confirm power supply control
13. Position adjustment
13.1 Adjust handlebar
13.2 Adjust brake handle
14. Disassembly
14.1 Dismount handlebar of accelerator
14.2 Dismount handlebar
14.3 Dismount throttle bracket
15. Transmission gear
15.1 Check chain and chain wheel
15.2 Clean and lubricate chain
15.3 Disassemble and assemble chain
16. Electric system
16.1 Electric system drawing
16.1 Check electric system
17. The use and maintenance of battery
17.1 Disassembly and assembly of battery
17.2 Maintenance and storage of battery
17.3 Battery charging
18. Checking and maintenance of controller
18.1 Disassembly and assembly of controller
18.2 Checking of controller
19. Electrical failure checking and removal
20. Failure diagnosis
1.2 Use of the manual

The symbol represents the dangers the bike may cause or other dangerous situations.

The symbol represents the dangers which may cause serious physical injuries.

The symbol represents the potential dangers which can cause harm to health.
1.3 Disclaimer
Modification of the bike may cause physical injuries.
The modification of the bike without approval of Chongqing Surron Technology Co., Ltd.
will lead to the following results:
• Loss of warranty.
• Needs for another driver’s license.
• Accidents and serious injuries.
Please read local provisions about electrombile and motor vehicle before using Qingfeng
bike.

According to the certification of Ll2-B electric moped Sur-Ron bike has

passed, its highest speed is 45km/h, so it is not allowed on expressway or the
road segment with the minimum speed of more than 45km/h.
If you have any question, please contact any official dealer of Chongqing Surron
Technology Co., Ltd.
The applicable laws require you to provide the following information:
• Your age.
• The equipment necessary for special route.
• Special license for the bike.
• The area with restrictions on vehicles.
2. Technical specification
2.1Bicycle parameters
Electromotor
type Brushless permanent magnet synchronous DC motor (highest
power 4.0W)
PMAC radial flow brushless, air-cooled and integrated rotate speed
and temperature sensor.
control unit AC/DC three-phase control unit (highest power 60V-80A) has two
available driving patterns:
SPORT：2 kW ECO：0.9 kW
highest speed ≤45 km/h
power source
type high-expanded ternary lithium power battery(60V32AH)
rated capacity 1900wh
charger The special high-performance portable charger for LIGHT BEE
power battery
Power: 600 W
Input: 110V AC or 240V DC (according to local voltage)
Output: 67.2V DC/10A
charging time 0%-100% - 3.5 hours
(standard) 0%-95% - 3 hours
0%-80% - 2 hours
mileage
continuation of ECO mode (average speed 25km/h)>100km
journey
electromotor double-stage reduction drive system
bicycle frame/hanger bracket/brake
bicycle frame Double-beam cradle type,

rear shock absorber multi-link central shock-proof system

stroke of front fork 200mm.
stroke of rear wheel 210mm.
front brake target at 4-piston hydraulic disk brake, disk 203mm
rear brake target at 4-piston hydraulic disk brake, disk 203mm
front tire cross-country 70/100-19
rear tire cross-country 70/100-19
front wheel disk Aluminum- 19*1.4
rear wheel disk Aluminum- 19*1.4
front shock double-shoulder fully adjustable oil pressure reed inverted front
absorber shock absorber
rear shock absorber multi-link fully adjustable damping single-tube air pressure damping
system
size
wheel base 1,230mm
height of vehicle 815 mm
seat
front rake of seat 26°
tube
ground clearance 270 mm
total length 1860 mm
width 780 mm
height 1,050 mm
weight
no battery 42Kg
bicycle 50 Kg
load capacity 100 Kg
2.2 Torque specification of important screws

serial
numbe item diameter of thread mm tightening torque N.m
r
install left support and right support
1、 M6 8N•m
under controller
2、 fasten front disk brake M5 8～10N•m
3、 fasten rear disk brake M6 10～12N•m
4、 fasten rear chain disk M8 20～25N•m
5、 rear shock absorber, cocket centring M8 20～25N•m
6、 fasten bolt of belt wheel M6 12N•m
7、 fasten bolt of output shaft sprocket M6 12N•m
8、 fasten nut of front belt wheel M12 40～50N•m
attachment bracket of left and right
9、 pedals and support of left and right M10 40～45N•m
pedals
10、 fasten support plate under battery M6 8N•m
11、 fasten bolt of connecting plate M6 10N•m
12、 fasten bolt of standing seat M5*25 5-6N•m
fasten bolts of standing seat and
13、 M5 5-6N•m
handlebar tube
14、 fasten front axle M12 20～25N•m
15、 fasten front disk brake M6 12N•m
16、 fasten bottom fork shaft M10 35N•m
fasten auxiliary frame and bicycle
17、 M8 20N•m
frame
18、 fasten nut of seat cushion M6 8N•m
rear shock absorber, bicycle frame
19、 M8 25-30N•m
and bottom fork
20、 fasten rear wheel and axle M12 55～60N•m
21、 fasten rear disk brake M6 12N•m
22、 fasten electrical machine M8 25N•m
fasten controller and support of
23、 M6 8-10N•m
controller
24、 fasten pedal and bicycle frame M8 25-30N•m
25、 fasten guard bolt under controller M8 20N•m
2.3 The highest speeds under different battery capacities (reference)
serial
numb battery capacity speed(km/h)
er
1 100% 42.8
2 90% 42.3
3 80% 41.6
4 70% 40.9
5 60% 40.1
6 50% 39.4
7 40% 38.7
8 30% 37.8

2.4 Bicycle arrangement

2.4.1 Position of bicycle parts

Fig 1
1. Rear fender assembly
2. Rear bottom fork
3. Seat cushion
4. Rear shock absorber
5. Tire
6. Bike frame
7. Three-phase brushless DC motor
8. Ternary power lithium battery
9. Control system
10. Headlight
11. Front shock absorber
2.3.2 Position of head parts

Fig 2
1. LCD Speedometer
2. Front brake handle
3. Rear brake handle
4. Throttle grip
5. Control switch
6. Rear-view mirror
2.3.3 LCD Speedometer functions

Fig 3
1. current speed
2. Top speed notice
3. brand logo
4. KMH indication
5. MPH indication
6. Mileage
7. Single trip distance
8. Trip distance in total
9. Buttons for function selections

3. Vehicle operation
This chapter includes all necessary knowledge related to Light Bee operation you need to
learn about:

When stop using SUR-RON light bee, cut off main switch.
Just to move the bike, turn off on/off switch.

If you plan to use the bicycle after more than 30 days, we suggest you to take
battery down, keep its capacity not less than 50% and charge it at least every
month. Only the charger and cable equipped for the bicycle can be used
because they are specially designed for the parts of the bicycle.

Only original charger can be used in charging

In order to achieve the best battery performance, charge the bicycle
immediately after use every time.

Full discharge may damage battery

The charging and electric power storage not conforming to the instructions in
the manual will invalidate the warranty of battery. These instructions are the
results of strict test and can help to achieve the maximum performance and
longest service life of battery.

Cut off air switch or dismount battery in repair or maintenance of bicycle.

Hot-line work is not allowed in case of part damage or accidents

3. Repair tools and preparation work (tools can be arranged by yourself or purchased from
Chongqing SUR-RON Technology Co., Ltd.. The special brake mineral oil should be
purchased from Chongqing SUR-RON Technology Co., Ltd.)
4.1 Light Bee’s special repair and maintenance tool kit
1、 inner hexagonal spearhead: S3, S4, S5, S6, S10
2、outer hexagonal spearhead: S12, S17
3、Round nut four-claw sleeve: S10
4、cross screw driver
5、AVO meter
6、original special brake mineral oil (LBN)
7、lubricating grease
4.2 Fix Light Bee
In terms of some maintenance operation of Light Bee, we suggest to fix Light Bee
according to the step.
In an open area, turn off power source, open Light Bee’s side stand on floor.
5. Disassemble and assemble battery (see Fig 4)
5.1After closing electric door lock, plug key into cover of ①battery compartment, then turn
key anticlockwise to open cover of battery compartment

Fig 4

Fig 5
.Cut off air switch, power source and output power line and signal line of battery③，④
.Hold the lifting handle of battery, lift it, then take battery out(see Fig 5)
5.1.1 Assembly
• Assemble battery according to the inverse disassembly steps.
6. Disassemble, assemble and tune damping system
6.1 Adjust compression damping of front shock absorber (see Fig 6)

Fig 6
The compression damping of front shock absorber is adjusted through the standard valve
core at the lower right. High-pressure pump is necessary. The recommended pressure is
7-10BAR(100-150 psi).
6.2 Adjust the setting of shock absorber
6.2.1 Tune front shock absorber(see Fig 7)
Adjust rebound damping (right shock absorber)
turn to +
restrain increase (slower)
turn to -
restrain decrease (faster)
preload adjustment (left shock absorber)
turn to +
increase of spring preload
turn to -
reduction of spring preload

Fig 7
6.2.2 Tune rear shock absorber (see Fig 8)
regulating valve of compression damping force
turn to +, compression pressure increases(harden)
turn to -. compression pressure lowers (soften)
regulating valve of rebound damping force
turn to +, restrain increase (slower)
turn to -, restrain decrease (faster)

Fig 8
adjustment of spring preload
turn nut clockwise to increase preload force
turn nut anticlockwise to reduce preload force
6.3 Damping and lubrication
Warning: Light Bee’s shock absorber is designed for non-detachable, don’t
attempt to open or disassemble shock absorber.

Don’t disassemble Light Bee’s shock absorber. Please lubricate hanger bracket according to
the following steps and keep its best state:
• dismount protective cover. (see Fig 9)
• unscrew fixed mount of dustproof ring and slide it along pillar
• clean the dust on breeches pipe (mud and old lubricating oil)
• Smear a layer of special lubricating oil for Light Bee on the pillar between fixed mount of
dustproof ring and breeches pipe.
• Tighten dustproof ring to keep lubricating oil inside it.

Fig 9
6.4 Disassemble and assemble front damping system
6.4.1 Disassemble front bow cap and instrument (see Fig 10)
• Dismount bolts of bow cap① ②, take down front bow cap and disconnect lamp line
• Dismount bolts of support of bow cap③ ④, disconnect instrument line and take down
instrument and support of bow cap.
6.4.1.1Assembly
• Assemble front damping system according to the inverse disassembly steps and fasten it
with the torque force of 10~12N.m.

Fig 10
6.4.2 Disassemble headlight and front turn light (see Fig 11)
.Dismount turn light, install nuts and take down turn light
.dismount bolts of support of bow cap②and separate headlight and bow cap①③
.dismount bolts of headlight and separate headlight and bow cap①④
6.4.2.1 Assembly
• Assemble headlight and turn light according to reverse disassembly steps and fasten
them with the torque force of 10~12N.m.

Fig 11
6.4.3 Disassemble front wheel assembly
• Loosen fastening bolts of wheel and axle of lower support of front shock absorber①
• Dismount fastening bolts of front wheel and axle, draw wheels and axles out and
dismount front wheel assembly
• Dismount bolts of front fender and lining②and front fender
6.4.3.1 Assembly
• Assemble front wheel assembly according to the inverse disassembly steps, fasten front wheel and axle
with the torque force of 10~12N.m and bolts with the torque fore of 20-30N.m.

Notice: it is important to fasten fastening bolts of wheel and axle alternatively

and repeatedly in order to disperse loads uniformly. Fastening the second bolt
may make the first bolt loose.

Ensure disk is between brake blocks in assembly of front wheel. Otherwise,

brake lining or disk may be damaged.

Fig 12
6.4.4.Dismount front brake disk (Fig 13, 14)
• place front wheel assembly flatwise with disk upwards. Clean and protect it.
• Dismount bolts of front brake disk① , take down front brake disk② and avoid
contaminating brake disk
6.4.4.1 Assembly
• Assemble front brake disk according to the inverse disassembly steps, use thread lock
glue (Loctite 243) on bolt, fasten it with the torque force of 8-10N.m. Pay attention to
rotation and install direction of brake disk, avoid contaminating brake disk, use absolute
ethyl alcohol in cleaning
• Ensure disk is at a correct position (see the following figure)

13Fig 13 14Fig 14
6.4.5Dismount front shock absorber (see Fig 15)
• Dismount bolts of front brake caliper and take down front brake caliper③
• loosen fastening bolts of front shock absorber of front steering column① , take down
steering limiting gommure of shock absorber②, and take down front left and right shock
absorbers
6.4.5.1Assembly
• Assemble front shock absorber according to the inverse disassembly steps and fasten it
with the torque force of 10~12N.m.

Notice: it is important to fasten bolts of shock absorber alternatively and

repeatedly in order to disperse loads uniformly. Fastening the second bolt can
make the first bolt loose.

Fig 15
6.5 Dismount rear shock absorber and cocket centring (see Fig 16, 17)
Dismount rear shock absorber according to the following steps:
• Put LIGHT BEE on platform or support platwise at bottom bracket area
• Unscrew the bolts of connector at the upper part of shock absorber②: fix rear wheel and
dismount bolts. Put the bicycle on floor.
• Unscrew the bolts of connector at the lower part of shock absorber②
• dismount shock absorber②
• Dismount bolts of cocket centring and take down connecting rod④of cocket centring⑤
and cocket centring.
6.5.1 Assembly
• Assemble rear shock absorber and cocket centring according to the inverse disassembly
steps. Fasten M8 bolt of shock absorber with the torque force of 25-30N.m.

Don’t damage the paint on cocket centring and bicycle frame in disassembly
and assembly of shock absorber.

Fig 16 17Fig 17

6.6 Disassemble damping spring

Disassemble damping spring according to the following steps:
• Dismount shock absorber (see “dismount rear shock absorber”)
• Unscrew preloaded adjustment nut to loosen spring.
• Dismount gasket of spring seat
• Dismount spring
6.6.1Assembly
• Assemble damping spring according to the inverse disassembly steps.

Fig 18
7．Check, disassemble and assemble head parts
7.1Check the stroke gap of head parts
Fig 15
If head parts have gap or steering position has resistance, check the tightness of bolt①of
cover of head parts. The correct torque is 8-10N.m. Before adjusting the bolt, fasten the
two fastening bolts between handlebar and stand pipe and the fastening bolts on
connecting plate.
• If necessary, fasten or unscrew bolts. If the recommended torque can’t be achieved by
fastening, starlike nuts may be damaged. In the case, you must use new head parts.
• If head parts can’t work normally (resistance in steering, gap or overhigh resistance) after
the recommended torque is achieved by tightening, some parts on bearing may be
damaged. In the case, you must use new head parts.
7.2 Disassemble head parts
Disassemble the head parts of Light Bee according to the following steps:
• Put Light Bee on support at bracket area
• Dismount front bow cap and instrument (see “disassemble front bow cap and instrument).
Don’t damage instrument line.
• Dismount front fender and front wheel (see “dismount front wheel assembly”)
• Dismount brake handle (see “separate brake handle from handlebar”)
• Unscrew locking bolts between handlebar and stand pipe of steering column (see Fig 16).
• Unscrew locking bolts of upper and lower connecting plate of front shock absorber
• Dismount lower connecting plate and shock absorber assembly and ensure no falling
parts
• Dismount bearing cover of hear parts
• Dismount starlike nuts. Install nuts inside stand pipe of steering column through pressure.
Use M6 thread rod to push nuts out from above.

If any part is damaged when drawing out head parts, install new head parts to
ensure the normal operation of system.

Fig 19
7.2.1 Assembly
• Assemble head parts according to the inverse disassembly steps and with the following
torque values:

Important matters: fasten cover of head parts, upper connecting plate and
clamp bolts between handlebar and steering column and locking bolt of shock
absorber of upper connecting plate successively.
• Fasten upper connecting plate and M5 bolt between handlebar and stand pipe of steering
column with the torque of 8N.m.
Locking M16 bolt of front shock absorber: 10-12N.m
Use special tool to pass new starlike nuts through the upper hole of stand pipe of steering
column.

Be careful when inserting starlike nuts. If it is at a deeper position than the

designed depth, locking bolts are not long enough to achieve proper fastening.

Fig 20
8 Disassemble and assemble shifter assembly (Fig 21)
Disassemble head parts of Light Bee according to the following steps:
• Put Light Bee on support at bracket area
• Dismount left and right rearview mirror
• Dismount handle grips, fuler and switch. Don’t damage switch line.
• Dismount upper pump of brake (see “dismount upper pump from handle bar”)
• Dismount locking bolts between handlebar and handlegear tube (see Fig 16), take handle
gear down
8.1.1 Assembly
• Assemble shifter assembly with the following torque and according to the inverse
disassembly steps:
• Fasten main pump of disk brake and M5 bolts between handlebar and handlebar tube
with the torque of 8-19N.m.

Fig 21
9. Check wheel
9.1 Check tire
9.1.1 Tire status
The height of sliding block of tire must be checked regularly. The acceptable minimum
height is 2mm. If its height is lower than 2mm, replace tire.
9.1.2 Pressure
Tire pressure examination is aimed at cooled tires, so tires should not be used within a few
hours before examination. The recommended pressure for front and rear wheels is
225KPa.
Inappropriate pressure or tire may cause:
- unexpected cracking
- lose control of bicycle
- low pressure causes increased rolling resistance
- premature wear
- clamping and piercing
9.2 Check wheel rim
Deformation examination for wheel rim should be conducted according to the following
steps:
• Put Light Bee on support at bracket area
• Confirm wheels rotate automatically. Check whether wheels swing transversely (see Fig
22). If they swing transversely, measure their transverse motion through indicator. If
transverse motion exceeds 1.5mm, check whether wheel rim is deformed or bearing is
damaged. If wheel rim is in a good condition, check whether tire is installed on wheel rim
correctly.

Fig 22
If wheel rim is normal and it is vertical (see Fig 23), bottom fork may be bended or
incorrect. Check bottom fork.
Fig 23
9.2.1 Tension of arm of wheel
Ensure the tension of arm of wheel is normal. Otherwise, bicycle may become unstable.
Check whether arm of wheel is tense. If any arm of wheel is not tense, fasten it and check
status of wheel rim and gap of wheel hub
10. Checking and maintenance of brake system
10.1 Check brake
10.1.1 Power examination
Before use, check whether the power and feeling of brake are normal. Force bearing point
is necessary. If there is no force bearing point two thirds of stroke of brake handle, press
brake rod repeatedly until it reaches brake disk.
Adjust the contact area of brake handle according to the indications in the following figure.
If force bearing point is not found at the starting point of stroke of brake handle, deflate
brake system (see “deflate brake”)
10.1.2 Check the status of flexible brake pipe
Check the length of all flexible brake pipes and accessories with brake handle and callipers
to find any potential damage or fluid leakage.
10.1.3 Check brake pad
As shown in Fig 24, the thickness of brake pad is 2.5mm at least(including metal support).
Replace the brake pads of less than 2.5mm immediately.

Fig 24
10.1.4 Check the thickness of brake disk
As shown in Fig 25, the thickness of brake disk is 1.6mm. Replace the brake disks of less
than 1.6mm immediately.

Fig 25
10.1.5 Check brake disk
Brake disk must be kept horizontal in order to ensure its normal work. Bended brake disk
will make braking feeling irregular, worsen power and control of brake and accelerate the
wear of brake pad.
Put LIGHT BEE on central support. Rotate wheel and observe disk passing by pad to check
whether disk has indentation or is bended. If disk doesn’t have friction with neighboring
parts, slight transverse motion is acceptable. If disk has friction with pad at any point,
replace it.
Don’t touch the surface of disk or pad with hands given the grease on your
fingers may lower braking force.

Prevent oil or braking oil from touching disk or brake pad. If the situation
happen, replace brake pad, dismount disk and clean them with isopropyl
alcohol.
10.2 Maintenance
10.2.1 Deflate brake
Deflate the brake on LIGHT BEE according to the following steps:
• Arrange necessary tools for deflation:
• short needle cylinder for pump
• long needle cylinder for brake caliper
• original brake mineral oil

Only original brake mineral oil is allowed in deflation. DOT brake fluid is
banned in any condition.
• Switch the stroke adjustment device on brake handle to (+) position.(rotate adjustment
device clockwise on right brake and rotate adjustment device anticlockwise on left brake at
the same time)
• Dismount brake caliper from brake (see “dismount brake caliper”). Ensure that brake
caliper can be at a position lower than other line.
• Dismount brake shoe (see “replace brake shoe”). When it is used to fix the shock
insulator of brake pad, fix piston on brake caliper in case that brake caliper bounces after
pressing brake handle. Use rubber band to fix shock insulator.
• Fix brake caliper above brake pump (brake handle).
When there is on oil in long needle cylinder, lift brake caliper above brake pump and
remove long needle cylinder from adapter.
• Dismount head bolts of brake caliper. Then, use long needle cylinder containing mineral
oil into brake caliper and fasten it with a 8mm wrench.
• Fix brake handle at the angle of 45°
• Dismount bleed screw and prevent oil leakage. Remarks: the bolts are made of plastics.
Be careful in operation in case of damages. Press short needle cylinder into the position of
plastic bolts.
• Given the low position of brake caliper, the oil pumped from long needle cylinder flew out
from the top of short needle cylinder.
• When all oil in long needle cylinder is pumped out, use long needle cylinder to pump the
oil in oil line back. Repeat the process until here is no bubbles at the top (th position of
brake pump).
• When there is no oil in long needle cylinder, lift brake caliper from brake pump and take
long needle cylinder out with adapter.
• Put it down slowly. When oil flows out from the hole of brake caliper, put deflation plug
back.
• Dampen brake caliper.
• Take needle cylinder down from brake pump carefully and place plastic bolts at the
corresponding positions. (maximum torque 40Nm, prevent damages).
• Dismount gasket of piston from brake caliper.
• Reinstall brake shoe.
• Reinstall brake caliper on support of disk brake aligning to disk.
• Check whether system is normal.
10.2.2 Replace brake shoe (see Fig 26)
Dismount brake pad according to the following steps:
• Dismount brake caliper (see “dismount brake caliper”)
• Dismount pin bolts ①
• Dismount brake pad ②
• Push it out through piston
，：2.5 N.m。，。Install new pad according to the inverse disassembly steps. The torque
tightening of safety bolt is 2.5N.m. After installing brake shoe, press brake handle
repeatedly until the contact point between brake shoe and disk becomes stable.

After replacing brake shoe, deflate brake caliper to obtain the maximum
braking force if necessary.

Fig 26
10.3 Dismount brake handle(see Fig 27)
Install brake handle on pump by pressing pull rod. Dismount brake handle according to the
following steps:
• Fix pump firmly, press handle, dismount positioning bolts and screens gasket from pin
axle. Push rod (A) down with the cylindrical tool with the diameter of less than that of pull
rod. Given pull rod may be pulled out soon, be careful in operation.
• Dismount handle.
Fig 27
10.3.1 Assembly
• Assemble brake handle according to the inverse disassembly steps. Press handle to its
original position with nylon hammer. Ensure spring is at a correct position.
10.4 Separate main pump of brake from handlebar (see Fig 28)
Separate main pump of brake according to the following steps:
• Dismount card holder bolts (A).
• Dismount cover of card holder (B).
• Dismount main pump of brake (C).
10.4.1 Assembly
Assemble main pump of brake according to the reverse disassembly steps. Fix fastening
bolts with the torque of 4Nm. Card holder must be put at a correct position(arrows inside).

Fig 28
10.5 Dismount brake caliper (Fig 29)
Dismount brake caliper according to the following steps:
• Dismount bolts①
• Dismount brake caliper②
10.5.1Assembly
• Put LIGHT BEE on support at bracket area.
• Put brake caliper②at a correct position and fasten bolts. Don’t tighten bolts for future
adjustment of position of brake caliper. Use thread lock glue (Loctite 243) on bolts.
• Pinch brake handle slightly and rotate wheel. Target brake caliper at brake disk correctly.
• Keep brake pressure handle still and fasten the bolts on brake caliper with the torque
force of 8-10Nm.
Fig 29
10.6 Dismount adapter of brake caliper (only suitable for front brake caliper)(see Fig 30)
Dismount adapter of brake caliper according to the following steps:
• Dismount brake caliper(see “dismount brake caliper”)
• Dismount the bolts used to fix adapter①
• Dismount adapter of brake caliper②
10.6.1 Assembly
• Assemble adapter of brake caliper according to the inverse disassembly steps. Use thread
lock glue(Loctite 243) on bolts and fasten bolts with the torque force of 8-10N.m.

Fig 30

Important matters: check the assembly procedures of brake caliper (see

“dismount brake caliper”) to ensure that brake caliper aligns to disk.
10.7 Dismount front brake assembly
Dismount front brake assembly from LIGHT BEE according to the following steps:
• Dismount main pump of brake from handlebar (see “dismount main pump of brake from
handlebar”)
• Dismount front brake caliper (see “dismount brake caliper”)
• Dismount tube clamps of flexible brake pipe and assembly.
• Assemble brake system according to the inverse disassembly steps and deflate hydraulic
system(see “deflate brake caliper”).
10.8 Dismount rear brake assembly
Dismount rear brake assembly from LIGHT BEE according to the following steps:
• Dismount rear main pump of brake from hanldebar (see “dismount main pump of brake
from handlebar”)
• Uncrew rear flexible brake pipe from main pump of brake.
• Dismount flexible brake pipe
• Dismount tube clamps of internal flexible brake pipe
• Pull flexible brake pipe off bicycle frame completely.
• Dismount rear brake caliper (see “dismount brake caliper”)

Remarks: a few drops of brake fluid may flow out of flexible brake pipe in the
operation. The brake fluid in LIGHT BEE is mineral oil and nor corrosive. Brake
fluid can be wiped with duster cloth.
Permanent damages may be caused if brake pad contacts machine oil.
10.8.1 Assembly
• Put flexible brake pipe near brake caliper on bicycle frame
• Install tube clamps
• Place parts according to the following sequence: rubber guard plate, nut, insertion piece
and lubricating oil.
• Tighten flexible brake pipe and main pump of brake and ensure flexible brake pipe is not
deformed. If flexible brake pipe is distortional, unscrew and correct it.
• Install rear brake caliper
• Install rear brake caliper
• Add brake fluid to line (see “deflate brake”)

Remarks: in the operation, tightening brake caliper and tightness of flexible

brake pipe and main pump of brake are very key and refueling and deflation are
important equably. Please employ professionals for the operation and be
careful.
11 Disassemble and assemble bicycle
11.1 Dismount middle bushing (see Fig 31)
Dismount middle bushing from LIGHT BEE according to the following steps:
• Dismount rear wheel from bicycle (see “dismount rear wheel”) and put it on worktable.
• Dismount rear fork from bicycle (see “dismount rear fork”) and put it bushing on
worktable.
• Dismount lining①of middle bushing, dismount belt wheel and chain wheel with wrench
and fasten bolts②
• Dismount belt wheel and small chain wheel③
• Take oil seal of bushing down with special tool④
• Take bearing and internal lining of middle bushing down with special tools
11.1.1 Assembly
• Assemble middle bushing according to the inverse disassembly steps, smear lubricating
grease on bearing, lining and oil seal. Use thread lock glue (Loctite 243) on fastening bolts
and fasten bolts with torque force of 10-12N.m.

Fig 31
11.2 Dismount side cover of electrical machine (see Fig 32)
Dismount side cover of electrical machine from LIGHT BEE according to the following
steps:
• Dismount fastening bolts① of side cover of electrical machine and put them② on
worktable.
11.2.1 Assembly
• Assemble side cover o electrival machine according to the inverse disassembly steps.
Fastening torque 4-5N.m.

Fig 32
11.3 Disassemble side cover of electrical machine (see Fig 33)
Dismount side cover of electrical machine according to the following steps:
• Dismount combination screws of side cover of electrical machine on platform with tools
and separate side and cover①②
11.3.1 Assembly
• Assemble side cover of electrical machine according to the inverse disassembly steps.

Fig 33
11.4 Disassemble and assemble first level transmission belt
ismount first level transmission belt from LIGHT BEE according to the following steps:
• Dismount side cover of electrical machine from bicycle (see “dismount side cover of
electrical machine”)
• unscrew bolts on upper electrical machine of bicycle and dismount belt and increase
pre-pressure (see “dismount electrical machine assembly”)
• Dismount bottom fork assembly from bicycle(see “dismount rear fork assembly”) and
take first level transmission belt down.
11.4.1 Assembly
• Assemble first level transmission belt according to the inverse disassembly steps.
Fastening torque M8: 25N.m, M10:35N.m.
11.5 Dismount left pedal assembly (see Fig 34)
Dismount left pedal assembly from LIGHT BEE according to the following steps:
• Put the cork base of bicycle down on platform with rear wheel suspended, lift side stand.
• Dismount switching line, fix belting, disconnect side stand and and cut off switching line.
Avoid damaging switching line.
• Dismount fastening bolts of left pedal assembly①and left pedal assembly②from bicycle.
11.5.1 Assembly
• Assemble left pedal assembly according to the inverse disassembly steps. Tightening
torque 25-30N.m.

Fig 34
11.6 Disassemble left pedal assembly (see Fig 35)
Disassemble left pedal assembly according to the following steps:
• Use tools to disassemble return spring③of side stand on platform and avoid harms
caused in the disassembly of spring.
• Dismount side stand, install stepped screw and separate side stand① and left pedal
support②.
• Dismount side stand on left pedal support, turn off sensor and use special tools to take
the induced magnet on side stand down.
• Dismount hanging hook of spring of side stand on left pedal support④.
11.6.1 Assembly
• Assemble left pedal assembly according to the inverse disassembly steps. Avoid the harm
caused in the assembly of spring. Smear lubricating grease on stepped screws in the
assembly of side stand.

Fig 35
11.7 Dismount right pedal assembly (see Fig 36)
Dismount right pedal assembly from LIGHT BEE according to the following steps:
• Put cork base of bicycle down on platform with rear wheel suspended, lift side stand.
• Dismount fastening bolts of right pedal assembly① and right pedal assembly② from
bicycle.
11.7.1 Assembly
• Assemble right pedal assembly according to the inverse disassembly steps. Tightening
torque 25-30N.m.
Fig 36
11.8 Disassemble pedal assembly (see Fig 37)
Disassemble pedal assembly according to the following steps:
• Use tools to dismount pedal-linked pin on platform, take return spring of pedal down and
separate pedal and adapter bracket of pedal①②.
• Dismount side stand, install stepped screws and separate adapter bracket of pedal②and
pedal support③.
• Dismount side stand on left pedal support and turn off sensor④.
• Dismount hanging hook of spring of side stand on left pedal support⑤.
11.8.1 Assembly
• Assemble pedal assembly according to the inverse disassembly steps. Tightening torque
of adapter bracket of pedal 40-45N.m.

Fig 37
11.9 Dismount guard plate under electrical machine (see Fig 38)
Dismount guard plate under electrical machine according to the following steps:
• Put side stand down on floor to support bicycle stably.
• Dismount guard plate of electrical machine, fasten bolts and thread holder①②and take
guard plate under electrical machine down③.
11.9.1 Assembly
• Assemble guard plate under electrical machine according to the inverse disassembly
steps. Tightening torque of bolts 20N.m.

Fig 38
11.10 Dismount guard plate under controller (See Fig 39)
Dismount guard plate under controller according to the following steps:
• Dismount protective guard under electrical machine (see “dismount protective cover
under electrical machine”)
• Dismount fastening bolts of protective cover under controller①②, take protective guard
under controller down③.
11.10.1 Assembly
• Assemble guard plate under controller according to the inverse disassembly steps.
Tightening torque of fastening bolts of M6 protective guard 5N.m

Fig 39
11.11 Dismount air switch combination (see Fig 40)
Dismount air switch combination according to the following steps:
• Dismount power battery of bicycle (see “dismount power battery”)
• Dismount control system of bicycle (see “dismount controller”)
• Dismount fastening bolts①of support of air switch combination③and bolts②respectively,
disconnect and topple wiring of sensor and take air switch combination③down.
11.11.1 Assembly
• Assemble air switch combination according to the inverse disassembly steps. Tightening
torque of M6 fastening bolts 10N.m.

Fig 40
11.12 Disassemble air switch combination (see Fig 41)
Disassemble air switch combination according to the following steps:
• Dismount wiring of dumping sensor, install support①and take down dumping sensor.
Avoid damaging sensor line.
• Dismount air switch, fix bolts, cut belting of wiring harness, take air switch②, nylon
dividing bushing and fixing wire clamp down.
• Dismount limited block of front support of battery.
• Take front pack PE foam④down from support③through knife.
11.12.1 Assembly
• Assemble air switch combination according to the inverse disassembly steps. Tightening
torque of M6 fastening bolts 10N.m. Generally, pack PE foam of front buffer doesn’t have
to be replaced. It contains mucilage glue and can’t be used repeatedly. If you need to to
replace it, sticking is suggested.

Notice: dumping sensor is assembled according to the arrows on protective

jacket of sensor. Arrows must be upward. Otherwise, bicycle won’t start.

Fig 41
11.13 Dismount US and electric control lock combination (see Fig 42)
Dismount USB and electric control lock combination according to the following steps:
• Dismount USB and fastening bolts of cover of electric control lock①.
• Take USB and cover of electric control lock combination out from above. Avoid damaging
electrical circuit because of large force and disconnect USB and electrical interface of
electric control lock.
11.13.1 Assembly
• Assemble USE and electric control lock combination according to the inverse disassembly
steps. Tightening torque of M6 fastening bolts 5N.m

Fig 42
11.14 Disassemble USB and electric control lock (see Fig 32)
Dismount USB and electric control lock combination according to the following steps:
• Use tools to press limited mortise and tenon of electric control lock, pull it upwards and
take electric control lock out①.
• Dismount fastening plastic nuts④of USB, take USB②and waterproof plastic cap③out
and separate ②③.
11.14.1 Assembly
• Assemble USB and electric control lock according to the inverse disassembly steps. Avoid
damaging plastic nuts because of large force.

Fig 43
11.15 Disassemble electrical machine assembly (see Fig 44)
Dismount electrical machine assembly according to the following steps:
• Put LIGHT BEE on support. Reinforce rear wheel. Suspend cock base at electrical
machine area or use mobile lifting tool to support it.
• Dismount guard plate under electrical machine of bicycle (see “dismount guard plate
under electrical machine”)
• Dismount control system of bicycle (see “dismount controller”)
• Dismount side cover of electrical machine (see “dismount side cover of electrical
machine”)
• Use lifting tool or hands to support electrical machine⑨, dismount bolts⑤⑥ and ①⑦
successively and take lining, tensioner and gasket②③④⑧.
• Support and move electrical machine⑨, separate belt and electrical machine and take
electrical machine⑨down
11.15.1 Assembly
• Assemble electrical machine assembly according to the inverse disassembly steps.
Tightening torque of fastening bolts of M8 electrical machine 25N.m.

Notice: after combining belt and electrical machine, install bolts①⑤⑥⑦on belt
and screw ①and ⑤successively. Use tools to adjust tensioner to make belt
tense until its elasticity can be felt with hands. In assembly, the height of
bolts①⑤ should be kept consistent in order to make first level belt wheels
parallel. Otherwise, belt may have abnormal sound.

Fig 44
11.16 Dismount tailstock assembly (see Fig 45)
Dismount tail stock assembly according to the following steps:
• Put LIGHT BEE on support.
• Dismount rear and inner fender (see “dismount rear and inner fender”). disconnect
taillight and GPS interface (), avoid damaging electrical interfaces.
• Dismount power battery (see “dismount power battery”)
• Dismount support④connecting to seat of battery lock and fastening bolts of bicycle
frame⑥
• Dismount fastening bolts of trim cover of seat of battery lock①.
• Dismount left and right fastening bolts②⑤ of tailstock and take tailstock assembly③
down.
11.16.1 Assembly
• Assemble tailstock assembly according to the inverse disassembly steps. Tightening
torque of bolts of M8 tailstock 20N.m, tightening torque of M6 bolts 8~10N.m.

Fig 45
11.17 Disassemble tailstock assembly
Disassemble tailstock assembly according to the following steps:
• Put tailstock on platform.
• Dismount tightening bolts of trim cover of seat of battery lock and take trim cover of seat
of lock battery down③.
• Dismount bolts of seat cushion and take seat cushion down①.
• Dismount rear fender⑤from seat cushion①.
• Dismount seat of battery lock②and attachment bracket①from tailstock.
11.17.1 Assembly
• Assemble tailstock assembly according to the inverse disassembly steps. Tightening
torque of M6 seat cushion 8~10N.m.

Fig 46
11.18 Dismount left and right limited blocks of battery (see Fig 47)
Dismount left and right limited blocks of battery according to the following steps:
• Dismount power battery (see “dismount battery”)
• Dismount fastening bolts of left and right limited blocks of battery①and take left and
right limited blocks②down.
11.18.1 Assembly
• Assemble left and right limited blocks of battery according to the inverse disassembly
steps.
Fig 47
11.19 Dismount horn(see Fig 48)
Dismount horn according to the following steps:
• Dismount USB and electric control lock combination (see “dismount USB and electric
control lock”)
• Dismount fastening bolts of horn①, disconnect electrical interface of horn, avoid
damaging electrical interface of horn and take horn②down.
11.19.1 Assembly
• Assemble horn according to the inverse disassembly steps. Tightening torque of M6 bolts
8N.m.

Fig 48
11.20 Dismount back shield of battery(see Fig 49)
Dismount back shield of battery according to the following steps:
• Dismount power battery (see “dismount battery”)
• Dismount support connecting to seat of battery lock and fastening bolts of bicycle frame
(see “dismount tailstock assembly”).
• Dismount four bolts①on back shield of battery, take small guard plate② down and back
shield of battery③.
11.20.1 Assembly
• Assemble back shield of battery according to the inverse disassembly steps.

Fig 49
11.21 Dismount back wheel assembly (see Fig 30)
Disassemble back wheel assembly according to the following steps:
• Put LIGHT BEE on support at bottom bracket area
• Take belting of taillight line of rear fender down and disconnect taillight line
• Dismount fastening bolts of brake caliper of rear disk brake, take brake caliper of rear disk
brake⑤ and put plastic piece with the thickness of 2mm between brake pads
• adjust adjustment bolts of rear wheel, shorten bolts to take chains down, loosen shaft of
rear whee, take lower chains③ down(if adjustment bolt of rear wheel is not short enough,
use tools to dismount clip of chain interface and disconnect chain), then, take shaft of rear
wheel down
• Take rear fender assembly②, back wheel assembly④ and support of rear disk brake

In the disassembly and assembly of rear wheel assembly, avoid damaging the
paint on bottom fork.
11.21.1 Assembly
• Assemble back wheel assembly according to the inverse disassembly steps and use
torque wrench to fasten bolts:
• Bolts of rear brake caliper: 10N.m
• Nuts of rear wheel and axle: 55-60N.m

In the assembly of rear wheel, ensure disk is between brake pads. Otherwise,
brake rim or disk may be damaged.

Fig 50
11.22 Disassemble rear wheel (see Fig 51)
Disassemble rear wheel according to the following steps:
• Put rear wheel assembly on worktable
• Take left and right linings①④ of rear wheel down, dismount bolts⑤ of rear brake disk,
and take rear brake disk⑥ down (clean and protect disk)
• Take bolts of rear chain wheel② and rear chain wheel③ down

In the disassembly and assembly of rear wheel, don’t damage the paint on
wheel disk and wheel hub, clean and protect brake disk and avoid
contaminating rear brake disk.
11.22.1 Assembly
• Assemble rear wheel according to the inverse dsassembly steps and fasten bolts with
torque wrench:
• Bolts of rear brake disk: 12N.m
• Bolts of chain wheel of rear wheel: 20-25N.m

Fig 51
11.23Dismount rear fork (see Fig 52)
Dismount rear fork according to the following steps:
• Dismount rear shock absorber, cocket centring, belt and chain of electrical machine (refer
to the disassembly method of rear shock absorber, cocket centring, belt and chain of
electrical machine)
• Dismount bolts of protective cover of middle bushing and take protective cover of middle
bushing down
• Loosen nuts of shaft of bottom fork and take nuts of bottom fork down
• Use steering tool to push shaft of bottom fork outside and take bottom fork① down
• Move rear fork, take down rear fork② and middle bushing combination③
11.23.1 Assembly
• Assemble rear fork according to the inverse disassembly steps and smear lubricating oil
on bearing and bushing.

Fig 52
11.24 Disassemble rear fork (see Fig 53)
• Use tools to dismount bearing of bottom fork and take isolation pad down
11.24.1 Assembly
• Assemble bearing through pressure according to the inverse disassembly steps and
smear lubricating oil on bearing and lining.
Fig 53
11.25 Disassemble rear fender assembly(see Fig 54)
Disassemble rear fender assembly according to the following steps:
• Dismount fastening bolts of cover plate of seat of taillight⑤, take cover plate, disconnect
interface of taillight line, dismount belting of wiring harness and separate connecting line
and rear fender.
• Dismount fastening bolts of rear fender⑥ and take rear fender assembly.
• Dismount rear fender, put it on platform, dismount fastening bolts of seat of taillight⑤
and take seat of taillight down.
• Dismount taillight②, support combination① of turn light and rear license plate④
successively.
• Dismount turn light③ and rear reflector on support① of turn light.
11.25.1 Assembly
• Assemble rear fender assembly according to the inverse disassembly steps.

Fig 54
11.26 Disassemble rear and inner fender (see Fig 55)
Disassemble rear and inner fender according to the following steps:
• Use tools to dismount plastic screw① of rear and inner fender and take rear and inner
fender down②.
11.26.1 Assembly
• Assemble rear and inner fender according to the inverse disassembly steps.

Fig 55
11.27 Disassemble and assemble cover of battery compartment (see Fig 56)
• Use keys to open cover of battery compartment. And use long flat nose pliers to take
spring clip down from shaft of flat head pin①② and draw shaft of pin out①②
• Dismount cover of batter compartment
11.27.1 Assembly
• Assemble cover of battery compartment according to the inverse disassembly steps.

Fig 56
11.28 Dismount stop plate under battery (see Fig 57)
Dismount stop plate under battery according to the following steps:
• Dismount power battery (see “dismount battery”)
• Dismount rear fender of battery (see “dismount rear fender of battery”)
• Dismount electrical machine (see “dismount electrical machine assembly”)
• Dismount fastening bolts①② of stop plate under battery, take speed-regulating inhaul
cable down, disconnect speed-regulating center control and electrical interface of
converter. Take stop plate under battery down.
11.28.1 Assembly
• Assemble stop plate under battery according to the inverse disassembly steps.

Fig 57
11.29Disassemble stop plate under battery (see Fig 58)
Disassemble stop plate under battery according to the inverse disassembly steps:
• Use tools to take crash pad① down on platform (if any)
• Dismount fastening bolts② of stop plate③ and support④ of battery to separate ③ and
④.
• Dismount fastening bolts⑤ of power converter and speed-regulating center control and
take power converter and speed-regulating center control⑥.
11.29.1 Assembly
• Assemble stop plate under battery according to the inverse disassembly steps.

Fig 58
12. Checking and maintenance of speed regulation control device and brake control device
12.1 Check brake
If brake works normally, regular checking is very important (see “checking and
maintenance of brake”). Check brake and power cut of brake. Front and rear brakes both
contain a sensor. When user brakes, sensor will cut off the power source of motor. Please
follow the following steps to check whether system works normally.

Warning: be careful when LIGHT BEE accelerates on worktable. It can rotate

freely, so it may accelerate suddenly. Keep chain and wheel away from support
or any other static parts. When bicycle is energized, don’t touch wheel or drive
system.
• Put LIGHT BEE on a central worktable and and turn on it.
• Operate a brake, twist handle of accelerator slightly. If rear wheel accelerates, that
means system has faults. Check the other brake according to the above steps.
• If system has any fault, check sensor and electrical connection of brake.
12.2 Check handle of accelerator (accelerator)
• Accelerator only can be checked on bicycle. The operation conditions and driver’s
operation speed and angle
• If no response is made according to the provisions, check electrical connection and
perform diagnosis(refer to “electric diagnosis”)
After operation, handle of accelerator must be at the position of stand-by(non power). if its
is not, adjust or replace handle of accelerator.
• Check switching power supply.
12.3 Confirm power supply control
The operation on power supply control must be checked through the test on bicycle. Power
output should be locked or unlocked according to the provisions.
If it doesn’t work normally, check electrical connection and make a diagnosis (refer to
“electrical diagnosis”).
13 Position adjustment
13.1 Adjust handlebar (see Fig 59)
Ensure handlebar is fixed firmly at the center of stand pipe. If is not, unscrew the four bolts
of card holder(A) of stand pipe, move it to the center and fasten M5 bolt equably. Adjust
these bolts alternatively until torque reaches 5-6 N.m.
The angle of handlebar must be adjusted in order to make users feel comfortable and safe
in riding. As you change the angle of handlebar, the position of control device and brake
handle will change and needs to be adjusted again. (see “adjust brake handle”)

Fig 59
13.2 Adjust brake handle
Sit on the seat of bicycle and adjust brake handle with fingers. Adjust their angle to make
them align to your arms when your fingers are on brake handle.
Adjust the position of brake on handlebar until users can pull the edge of brake handle with
one or two fingers.
Adjust the range of brake handle with tools until users can reach handle easily with fingers.

After adjusting the position of brake rod, adjust the position of accelerator and
shift lever in case of influencing brake.
14 Disassembly
14.1 Dismount handle of accelerator
Dismount handle of accelerator according to the following steps:
• dismount protective agraffe of wiring harness
• cut cable tie
• unscrew bolts of connector of accelerator
• release inhaul cable of accelerator
• Pull handle of accelerator out from handlebar
14.2 Dismount handlebar (glue)
Lift the edge of left handle and spray contract cleaner between handle and handlebar to
dismount handle. Then, pull handle out.
Before dismounting right handle, cut right handle open longitudinally carefully until it can
be opened and dismounted.
Before installing a new handle, clean handlebar(left) or handle of accelerator(right), smear
polyurethane adhesive on its surface and plug handle into its end.
14.3 Dismount seat of fueler
Dismount seat of fueler according to the following steps:
• Unscrew the bolts of seat of fuler.
• Take fueler out from seat of fueler and release accelerator cable
• screw accelerator cable out from seat of fueler
• Pull stay wire out.
14.3.1 Install hand-held shift lever
• pass stay wire of accelerator through shell of seat of accelerator and screw shell and
threaded rod of accelerator cable
• Pull core of accelerator cable out and cover handlebar with handle of accelerator.
• Connect core of stay wire to handle of accelerator. Cover handlebar with seat of fueler
and fueler of accelerator.
• Rotate fueler slightly until it moves and bounces back normally and smoothly.
• Fix shell of seat of fueler A and B with bolts. When fastening bolts, adjust the angle of
seat of fueler to ensure no object will influence the motion of brake handle.
• Operate fueler of accelerator to make it move normally.
15. Transmission gear
15.1 Check chain and chain wheel
15.1.1 Check chain wheel
Check the wear of front chain ring and strap. Fig 60 shows the shape of normal gear teeth
and worn gear teeth. (good state/bad condition). if it is in bad condition, replace it.

Fig 60
15.1.2 Check chain
Check the state of chain regularly. Pull chain as shwon in Fig 61. If any broken tooth is
found at the step, replace chain. Swing chain as shown in Fig 62 and ensure the vertical
oscillating quantity of chain is 10-15mm. If the vertical oscillating quantity of chain is not
10-15mm, adjust the tension degree of chain timely. If the adjustment limit of rear wheel
of bottom fork is exceeded, suggest to replace chain (see “dismount chain”).

,
Fig 61

Fig 62
15.2 Clean and lubricate chain
Clean chains after use every time. It is very important to smear special chain oil to keep
chains lubricated.
15.2.1 Lubrication of chain
Lubricate LIGHT BEE according to the following steps (see Fig 63):
Arrange the following objects:
• One barrel with hot water and soap.
• One big brush.
• One small brush.
• Defatted cleaner.
• chain oil of motorcycle.
• one piece of duster cloth without traces of fabric
• put LIGHT BEE on central worktable
• Clean chains with big brush and plenty of soap water and wash brush frequently.
• Clean chains of rear wheel and smear defatted cleaner on the chains of top roller below.
Then, wipe chains with duster cloth.
• Smear a handful of chain oil of motorcycle on chains and top roller. Rotate rear wheel
forwards to make all chains touch chain oil. Avoid contaminating brake system when
smearing chain oil.

Fig 63
15.3 Dismount chiains
LIGHT BEE has 420 chains, which is a fast and simple system connecting to chain links (see
Fig 64).
Dismount chains from LIGHT BEE according to the following steps:
• Put LIGHT BEE on central worktable
• Adjust the position of rear wheel until minimum wheel base (rear wheel is closest to
bottom fork) and maximum degree of droop and and swing are obtained.
• Look for chain connector and rotate rear wheel until power chain link is below bottom
fork(A)
• Push card lock-up clip① with tools as shown in the following figure. Take lock-up clip①
and connecting plate② down successively. And push connector③ out from one side. You
may need some long flat nose pliers in the process.
Fig 64
15.3.1 Install chains (see Fig 65)
Install chains according to the inverse dismounting steps. After chain links return their
original positions, pull chains to fix chain links. Adjust chains and length of bolts. Adjust the
tension degree of chains by adjusting the position of rear wheel. Ensure the vertical
oscillating quantity is 10-15mm

Fig 65

In installation, the opening end direction of chain lock is contrary to the

movement direction of chain.

16. Electrical system

16.1 Electrical systematic drawing of bicycle
 Fig 66
16.2Check electrical system
Users must check the state of connectors of battery, controller and bicycle cable, especially
the largely exposed or frequently operated parts.

Before any operation on the electrical system of LIGHT BEE, take battery out or
stop other operations in case of damaging electrical elements.

17. Use and maintenance of battery

17.1. Disassembly and assembly of battery (see Fig 67)
17.1.1 Plug key① into lock of cover of battery compartment and turn key to open cover of
battery compartment②

Fig 67 Fig 68
.Disconnect air switch, cut power source off and disconnect output power line and signal
line of battery③, ④
.Hold lifting yoke of battery and lift it to take battery out (see Fig 68)
17.1.2 Assembly of battery
• Assemble battery according to the inverse disassembly steps.
17.2Maintenance and storage of battery
Check electricity display of battery regularly. If the electric quantity of battery is lower than
20%, charge it timely. If battery won’t be used for long, charge it until its electric quantity
reaches about 60% and close the air switch of bicycle. Charge the battery every three
months in case of inactivating battery and influencing its performance and service life.

Users can’t dismount battery by themselves in case of damages and dangers.

Don’t throw LIGHT BEE battery in any case. If your battery needs to be
replaced or discarded, send it to the designated dealers or after-sale service
providers for appropriate handling.

Remember that many factors will influence the service life of battery. These
factors will change greatly wit use conditions and intensity.

17.3 Charging of battery

The battery only can be charged with special lithium battery in order to avoid damaging
battery or dangers.
Check whether the input voltage of charger is in line with the voltage of power grid
AC110V/220V. Plug the output interface of battery into the recharge socket of battery at
the left of bicycle and charge battery directly.
The silver socket at the left of lithium battery is recharge socket. Insert output plug and
input plug of charger successively. (Fig 69)

Fig 69

After battery has experience discharge protection, activate it through the following
ways.
Step 1: connect output end of charger to charge interface of battery and connect input
plug of charger to AC power grid. Then, the indicator of charger turns red and green
alternatively;
Step 2: after “pulling-inserting” input plug of charger once, the indicator of charger turns
red and green alternatively rapidly (time interval: 0.5 second) which lasts for 20 seconds;
Step 3: after 20 seconds, the red indicator of charger is on for 10 seconds. In the 10
seconds, “pull-insert” the input plug of charger once;
Step 4: at the moment, the function of “forced charging” starts, charger enters the
procedures of normal charging and the red indicator of charger flickers slowly (time
interval one second)
Remarks:
a、don’t “pull-insert” input plug of charger in 20 seconds in step 2. Otherwise, restart step
1 again;
b、“pull-insert” input plug of charger in step 3 needs to be finished in 10 seconds when red
indicator is on. Otherwise, restart step 1.

State of charging indicator of charger

state of indicator red indicator flickers green indicator is on red indicator and
green indicator
flicker alternatively
state of charger charging finished charging fault

About charging
Keep charging bicycle away from children.
Don’t use bicycle until 10 minutes after charging is just finished.
Don’t put any object on charger. The charger is used in dry and well-ventilated
room.
If you smell unpleasant odor or find overtemperature in charging or indicator
has not displayed fully charged for a long time, please stop charging
immediately and send bicycle to repair shop.

18 Checking and maintenance of controller

18.1 Disassembly of controller (see Fig 70)
Take controller down from LIGHT BEE according to the following steps:
• Turn off and disconnect air switch.
• Disconnect battery.
• Dismount guard plate of electrical machine (see “guard plate under electrical machine”)
• Dismount guard plate① under controller (see “dismount guard plate under controller”)
• Dismount fastening bolts② of decorative sheet on controller and take decorative sheet
and wire holder.
• Dismount fastening bolts of controller④ and fastening bolts③ successively, pull
controller forwards a little violently to separate controller and bicycle. Protect wires of
controller carefully.
• Disconnect electrical interface of controller and dismount fastening bolts⑤ of power
source of controller and take controller⑥ of electrical machine down.
18.1.1Assembly of controller
• Assemble controller according to the inverse disassembly steps. Tightening torque of
fastening bolts of power source of controller 8-10N.m.

70

Remarks: the fastening bolts of input line and output line of power source of controller
must be tightened according to the required torque. Because binding post and circuit
board adopt electrical welding process, excessively high tightening torque will damage
binding post of controller and lead to the falling of binding post.

Warning:
●Input line and output line of power source must be in line with the symbols on
controller. Red line on positive pole of power source is connected to “+” of
controller. Black line on negative pole of power source is connected to “-” of
controller. The output end of controller is connected to phase line of electrical
machine. “Y” end is connected to yellow line of electrical machine. “G” end is
connected to green line of electrical machine. “B” end is connected to blue line
of electrical machine. Otherwise, controller will be damaged or can’t start.
●Before the above work, disconnect air switch and power source or take
battery down.

18.2Checking of controller
Check the wire of controller is loose and its insulation.

19、Electrical failure checking and removal

Refer to the following table or failure diagnosis content for electrical failure checking and
removal of bicycle.

fault
phenom possible cause judgment method solution
enon
after battery is not
starting, installed in bicycle
install battery and insert
bicycle is or plug is not check plug of battery
plug
without inserted into
power battery
air switch in front
of battery has not check air switch turn on air switch
been opened
turn off air switch, use
multimeter to check
low battery
whether output voltage of
protection of charge battery
discharge interface of
battery
battery is normal
(DC45V-67.2V)
battery enters
check whether ambient
low-temperature
temperature is lower than （-2070）wait or battery
protection or
-20℃ or battery temperature becoming
high-temperature
temperature is too high normal(-20℃-70℃）
protection
protective tube of check state of protective
replace protective tube
main cable is fused tube
use multimeter to check
plug of electric whether electric door lock insert plug or replace
door lock has bad can be connected electric door lock
contact effectively
DC12V Use multimeter to
converter is check whether the output
replace converter
damaged of multimeter is normal
DC12V
after turning on or turning
off air switch, use
multimeter to check
whether the output If bicycle is energized
voltage of charging after dismounting positive
short-circuit interface of battery is pole line and negative
protection of normal(DC45V-67.2V). If pole line of controller, that
battery output voltage is tested when air means controller has
switch is turned off and short circuit. Replace
voltage isn’t tested when controller
air switch is turned on,
that means output has
short circuit
turn off air switch, use
multimeter to check the
output voltage of repair or replace battery
battery is damaged discharge interface of at the designated
multimeter is after-sale shop
normal(DC45V-67.2V). if
the above problem can’t
 be solved by charging with
charger, that means
battery is damaged
switch protection
lift side stand lift side stand
of side stand
After confirming the
Ausschalter disconnect plug of position of braking point
protection of brake switching line of brake of handle, adjust the
position of Ausschalter
protection for
dumping switch
after lifting bicycle, turn off after lifting bicycle, turn
not returning to its
key and turn on key off key and turn on key
original position
after bicycle backs
protection for
accelerator not
check free stroke of
returning to its adjust free stroke
accelerator cable
original position
after starting
after
low battery
starting, check electric quantity of
protection of charge battery
power battery
battery
supply is
over-temperature
normal whether after long-time use bicycle after electrical
protection of
but riding with heavy loads machine cools
electrical machine
electrical
over-temperature
machine whether after long-time use bicycle after
protection of
doesn’t riding with heavy loads controller cools
controller
work
disconnect switch plug of
switch of side disconnect switch plug of
side stand or replace
stand is damaged side stand
switch of side stand
disconnect switch plug of
Ausschalter of disconnect plug of switch
brake or replace switch of
brake is damaged line of brake
brake
disconnect plug of
dumping sensor is disconnect plug of
dumping sensor or
damaged dumping sensor
replace dumping sensor
0.8V-3.4Vscrew
accelerator, use
speed-regulating multimeter to check the
replace speed-regulating
central controller signal output voltage of
central controller
has bad contact or speed-regulating central
is damaged controller (black and white
line, green and white line)
 changes between 0.8V and
3.4V.
insert and pull plug and
plug of controller insert and pull signal plug
check whether terminal is
has bad contact of controller
normal
Plug of Hoare line
insert and pull plug and
of electrical insert and pull Hoare plug
check whether terminal is
machine has bad of electrical machine
normal
contact
：use multimeter to check
whether the voltage of
Hoare line of electrical
machine is normal:
4.2V，，;the voltage of red replace controller
line and black line is 42.V.
if voltage is abnormal, that
signal voltage of controller
has output failure
When rear wheel is at
fault of controller
different positions, use
or Hoare fault of
multimeter to check
electrical machine
whether the voltage of
Hoare line of electrical line
is normal:
The voltage of yellow line, replace electrical machine
green line and blue line for
black line are respectively
0V or 4.2V. if voltage is
normal, that means Hoare
line of electrical machine
doesn’t work
after repair or replace battery
plug of electricity
starting, in the designated
meter is loose
power after-sale shop
supply is
normal
and
repair or replace battery
electric electricity meter is
at the designated
quantity damaged
after-sale shop
of battery
is not
displayed
charger discharge check the remaining refer to battery charging
doesn’t protection of electric quantity of battery. and activation procedures
 work battery If electricity meter doesn’t
display, battery may enter
protection mode owing to
low electric quantity
060when teh temperature
battery charge it after battery
charger is lower than 0℃ or higher
temperature is too temperature becomes
doesn’t than 60℃, charging can’t
low or too high normal
work happen

insert and plug charging

plug of charger has check plug of charger
plug
bad contact
if bicycle still can’t be
changed after the above
charger is
possibilities are eliminated, replace charger
damaged
that means charger
doesn’t work
if bicycle still can’t be
charged after replacing
battery is damaged replace battery
battery, that means
battery doesn’t work
electric quantity of check electric quantity of
charge or replace battery
battery is too low battery
power temperature of
wait for electrical
mode is electrical machine controller enters power
machine or controller
invalid or or controller is too reduction mode
cools
power high
declines check whether power
power mode
mode switch is normal replace handle switch
switch is damaged
with multimeter
after outage of ，After confirming the
brake, switch is disconnect plug of outage position of braking point
adjusted line of brake of handle, adjust the
electrical
inappropriately position of outage sensor
machine
jolting leads to the
has no turn off key and turn on turn off key and turn on
protection of
power key key
controller
in jolting
insert and pull plug and
jolting makes plug replace plug or terminal
check whether terminal is
loose inside plug
normal
USBUSB is loose USBcheck USB USBinsert and pull USB
USBUSB
USBcheck whether the
doesn’t
USBUSB converter voltage of input plug of USBreplace USB
have
is damaged USB is normal with converter
input
multimeter
 /wrong setting of
reset status of km/mile reset state of km/mile
km/mile
speed is
modification of
not
gear train or
displayed check gear train and restore original gear train
transmission leads
correctly transmission ratio and transmission ratio
to changes o
reduction ratio
insert and pull plug and
plug of instrument replace plug or terminal
check whether terminal is
has bad contact inside plug
normal
the speed
check whether speed
on speed signal of
output signal of controller
instrume controller doesn’t replace controller
has voltage with
nt doesn’t have output
multimeter
change
check whether the input
instrument is
signal of instrument is replace instrument
damaged
normal with multimeter
wiring plug of insert and pull plug of
after replace plug or terminal
instrument has bad instrument and check
starting inside plug
contact whether terminal is normal
instrume
check whether the input
nt doesn’t instrument is
line of instrument is replace instrument
work damaged
normal with multimeter
plug of line of lamp insert and pull plug and replace plug or terminal
after
has bad contact check terminal is normal inside plug
starting,
12V check whether the
rear light
lamp is damaged input voltage of light is replace light
is not on
12V with multimeter
insert and pull plug and
wiring plug of horn replace plug of input line
check whether terminal is
is loose of horn
normal
after
check whether switch of
starting, switch of horn replace switch of left
horn is normal with
horn doesn’t work handlebar
multimeter
doesn’t
，12V press switch of horn.
work
Check whether the voltage
horn doesn’t work replace horn
on plug of horn is 12V with
multimeter

20 Failure diagnosis
Electrical failure diagnosis of bicycle is achieved through failure code on instrument. When
battery and controller of electric system of bicycle have failure, yellow indicator on
instrument is on and LCD displays the corresponding failure code, as shown in Fig 71.
 Failure codes and corresponding definition of failure are shown in the following table:
failure definition solution
code
Er-102 MOSMOS temperature sensor repair or replace battery at designated
of battery after-sale shop
Er-103 soft start failure of battery repair or replace battery at designated
after-sale shop
Er-105 preliminary over discharge charge battery
protection of battery
Er-106 MOSMOS damage of battery repair or replace battery at designated
discharge after-sale shop
Er-107 MOSMOS damage of batter repair or replace battery at designated
discharge after-sale shop
Er-114 lack of warmth protection of use it after battery temperature becomes
battery discharge normal
Er-116 over-temperature protection charge battery after battery temperature
of battery discharge becomes normal
Er-117 over-temperature alarm of use it after battery temperature becomes
battery discharge normal
Er-118 lack of warmth alarm of use it after battery temperature becomes
battery discharge normal
Er-119 preliminary over discharge charge battery
alarm of battery
Er-120 MOSMOS over-temperature use it after battery temperature becomes
alarm of battery discharge normal
Er-201 outage protection caused by use it after controller temperature becomes
over-temperature of normal
controller
Er-202 power reduction caused by use it after controller temperature becomes
over-temperature of normal
controller
Er-204 Hoare failure of controller check plug of Hoare line or replace electrical
 machine
Er-205 open-phase protection of check wiring of controller or replace controller
controller
Er-206 overcurrent protection of check wiring of controller or replace controller
software of controller
Er-207 overcurrent protection of check wiring of controller or replace controller
hardware of controller
Er-208 power tube failure of replace controller
controller
Er-209 current sampling benchmark replace controller
failure of controller
Er-211 earth fault of shifter of check wire of speed-regulating central
controller controller or replace speed-regulating central
controller
Er-212 protection of flywheel trip for check free stroke of accelerator cable
shifter of controller
Er-213 undervoltage protection of charge battery
controller
Er-215 outage protection caused by use it after temperature of electrical machine
over-temperature of electrical becomes normal
machine
Er-216 power reduction caused by use it after temperature of electrical machine
over-temperature of electrical becomes normal
machine
Er-217 485communication failure of 485check 485 communication line
battery 485
Er-218 SOClow capacity of SOC of charge battery
battery
Er-219 power reduction caused by use it after battery temperature becomes
over-temperature of battery normal
Er-221 upower reduction caused by charge battery
battery undervoltage
Er-222 power down failure of key check power source of key
Er-223 power-off protection of turn off key and turn off key after lifting bicycle
dumping
Er-224 power-off protection of side lift side stand or disconnect switch plug of side
stand stand