To ensure longevity and efficiency, regularly inspect and clean
the motor’s bearings. Follow the assembly steps for installation
and reverse them for disassembly.

FAQ

Q: How often should I check and clean the motor’s
bearings?

A: The frequency of bearing maintenance depends on your usage
and operating conditions. We recommend checking them periodically
based on your usage.

Q: What can happen if I use an improper gear ratio?

A: Improper gear ratio can lead to damage to the motor. It is
essential to select the correct gear ratio to ensure proper
functioning and prevent harm.

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USER MANUAL
Sensorless Brushless Motor QUICRUN 2840/2850 G2

Thank you for purchasing this HOBBYWING product! Any improper use may cause personal injury and damage to the product and
ATTENTION
related devices. We strongly recommend reading through this user manual before use and strictly abide by the specified operating
CAUTIONS
procedures. We shall not be liable for any liability arising from the use of this product, including but not limited to reimbursement for incidental or indirect losses. Meanwhile, we do not assume any responsibility caused by unauthorized modification of the product. We have the right to change the product design, appearance, performance and use requirements without notice.

20250312

HW-SMB352DUL00

01 Warnings
· Read the manuals of all the items being used in the build. Ensure gearing, setup,and overall install is correct and reasonable. · All connections, must be made correctly. You may loose control, or run into major issues caused by improper, bad, weak, or poor connections. · Never apply full throttle if the pinion is not installed. Due to the extremely high RPMs without load, the motor may get damaged. · Stop usage if the motor exceeds 100¥/212 . High temperature will damage the motor and cause the rotor to weaken.

02 Specifications

Model QUICRUN 2840SL-4700KV G2 QUICRUN 2850SL-4700KV G2 QUICRUN 2850SL-3400KV G2

LiPos

No-load Current

4700KV 2S

3.1A

4700KV 2S

4.3A

3400KV 2-3S

2.8A

Diameter/ Length
=28mm(1.1″) L=40.5mm(1.59″)
=28mm(1.1″) L=50.5mm(1.99″)

ShaftDiameter/ Length
=3.175(0.13″) L=14.5(0.57″)

Bearing size (mm)
FrontD9*D4*t4 RearD9.525*D3.175*t3.967

Poles Weight

Applications

89g

1/14 On-road/Buggy/Short Course Truck 1/16 Truck/Monster truck

125g

1/14 Truck/Monster truck 1/12 On-road/Buggy

26*$36/4-(

28( 1.10″)

14.50 ±0.50 40.50 ±0.20( 1.59″) 11.50

C.C.W 16

4-M3

3.175 ( 1/8″) 2.80

26*$36/4-( 28( 1.10″)

14.50 ±0.50 11.50

50.50 ±0.20( 1.99″)

C.C.W 16

4-M3

1 9 1 9

3.175 ( 1/8″) 2.80

03 Installation & Connection

Motor

Battery

Electronic Speed Controller

Switch

Receiver 1. Installation of the motor
There are 4 motor mounting holes in M3 specification, and the mounting holes are 4mm in depth, before installing the motor on the vehicle, please carefully confirm whether the specification of the screws is appropriate according to the thickness of the motor mounting plate to avoid damage to the motor due to too long screws. 2. How to Connect the Motor to an ESC There is no strict wire sequence requirement for the connection between the motor and the esc, the # A/# B/# C three wires of the motor and esc can be connected at will, if the motor rotation in the opposite direction, you can exchange any two wires. 3. Inspection Before powering on the esc, please check the motor installation and the order of allconnections.
04 Gearing
Reasonable selection of gear ratio is very important.lmproper gear ratio may cause damage. You can select the gear ratio according to the following points! 1. The operating temperature of the motor
The motor temperature should be lower than 100 degrees Celsius (212 degrees Fahrenheit) in operation. High temperature may cause the magnets to get demagnetized, the coil to melt and short circuit, and the EsC to getdamaged.A suitable gearing ratio can effectively prevent the motor from overheating. 2. The principle of selecting gear ratio To avoid the possible damage to ESC and motor caused by the overheating, please start with a small pinion/a big FDR and check the motor temperature regularly. lf the motor and ESC temperature always stays at a low levelduring the running, you can change a larger pinion/a lower FDR and also check the motor temperature regularly to ensure that the new gearing is suitable for your vehicle, local weather and track condition. (Note: For thesafety of electric devices, please check the ESC and motor temperature regularly.)

05 Assembly and Disassembly

In order to make the motor have longer service life and higher efficiency, we suggest to regularly check the bearing and clean the dirt in the motor. The

specific time depends on the frequency of using the motor and the site conditions. When installing, please follow the steps in the following assembly

drawing; when disassembling, follow the reverse steps.

Parts List

Stator Set x 1Pcs

1. Mount the motor rotor
3

2. Mount the rear end bell set
4

Screws for Fastening the Rear End Bell×3Pcs M1.6×3mm
Rotor x 1Pcs

3. Mount screws for fastening the rear end bell

4. Picture of the assembled motor

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-POHHBOH%JTUSJDU
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Rear End Bell x 1Pcs .BSDI

Documents / Resources

HOBBYWING QUICRUN Sensorless Brushless Motor [pdf] User Manual
QUICRUN 2840SL-4700KV G2, QUICRUN 2850SL-4700KV G2, QUICRUN 2850SL-3400KV G2, QUICRUN Sensorless Brushless Motor, QUICRUN, QUICRUN Brushless Motor, Sensorless Brushless Motor, Brushless Motor, Sensorless Motor, Motor

References

User Manual

HOBBYWING QUICRUN Sensorless Brushless Motor User Manual

QUICRUN Sensorless Brushless Motor

Product Information

Specifications

Product Usage Instructions

Installation & Connection

Gearing

Assembly and Disassembly

FAQ

Q: How often should I check and clean the motor’s
bearings?

Q: What can happen if I use an improper gear ratio?

Documents / Resources

References

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