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Founded in 1991, Ningbo Sunrun Bicycle Co., ltd & Its branch company Ningbo Tongkin Technology Co., Ltd.

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OEM/ODM Shifter Transmission Group Set Series
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Ningbo Tongkin Technology Co., Ltd.
About SunRun

Ningbo Dongjin Technology Co., Ltd is China OEM Shifter Transmission Group Set Series Supplier and ODM Shifter Transmission Group Set Series company was founded in 1991, specializing in the production of bicycle transmission systems, braking systems and other components. The leading products include a series of derailleurs, variable speed flywheels, high-end cassette hubs, disc brakes, brake components, cranksets and more than 300 varieties in six categories.

In 2015, in response to Made in China 2025, the company established Ningbo Dongjin Technology Co., Ltd. to develop a new internal and external variable speed transmission system, entering the first echelon of the domestic industry. "Chicheng wheel industry, quality first" is the pursuit of quality by Richeng people. The company has introduced internationally advanced key technologies such as precision cold forging, CNC machining, heat treatment, and multi-station stamping to develop transmissions with Richeng characteristics. , transmission kit, sales volume leads domestic peers. The registered brands SUNRUN, TONGKEEN and HEMU enjoy high reputation in domestic and foreign markets. The company has independent export rights, and its products are exported to Europe, North America, Central and South America, Africa, Southeast Asia and other countries and regions. Xu Mingqiang, chairman of the company, sincerely invites domestic and foreign merchants to come for negotiation and guidance.

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Industry Knowledge Extension

What are the key points for daily inspection and cleaning of Shifter Transmission Group Set Series?

The key points for daily inspection and cleaning of Shifter Transmission Group Set Series are as follows:
1. Daily inspection points
Oil level check:
Check the transmission oil level regularly to make sure it is within the specified range. An oil level that is too low may result in insufficient lubrication, while an oil level that is too high may result in oil spillage and overheating.
Use the dipstick or oil level sight glass to check to make sure the oil level is clearly visible and free of foam or impurities.
Leak check:
Carefully observe the transmission and its connecting lines, seals and joints for signs of oil leakage. Pay special attention to check leak-prone parts such as the oil pan, oil seal and drain port.
If leakage is found, it should be dealt with in time to avoid oil loss and environmental pollution.
Abnormal noise and vibration inspection:
While the vehicle is running, pay attention to monitor whether the transmission makes any unusual noises or vibrations. If there are any abnormalities, it may be a sign of wear or failure of internal parts, and should be inspected and repaired in time.
Connector inspection:
Check whether the transmission's connection harness, sensors and electrical connections are intact and not loose or damaged.
Check whether the connecting bolts of the transmission, engine, drive axle and other components are tight to ensure the stability and reliability of the transmission system.
2. Cleaning points
External cleaning:
Clean the transmission housing regularly with clean water and a soft cloth to remove dust, oil and debris. Avoid using corrosive cleaners or high-pressure water guns to avoid damaging the housing or seals.
Radiator cleaning:
The transmission radiator is prone to accumulation of dust and debris, affecting the heat dissipation effect. Regularly clean the radiator surface with compressed air or a soft brush to ensure it is properly ventilated.
Oil pan cleaning:
When replacing the oil, pay attention to cleaning the oil dirt and impurities in the oil pan. Use a clean cloth or oil-absorbing paper to wipe it clean to ensure that the newly added oil is clean and free of contamination.
Keep your work environment clean:
When performing transmission repairs or inspections, make sure the work environment is clean and dust-free. Avoid operating in a dusty environment to prevent impurities from entering the transmission.
Through daily inspection and cleaning work, potential transmission problems can be discovered in time and corresponding measures can be taken to ensure the normal operation and extended service life of the Shifter Transmission Group Set Series. At the same time, it also helps to improve the overall performance and safety of the vehicle.