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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

How to regularly replace the oil and filter element of Shifter Transmission Group Set Series?

Shifter Transmission Group Set Series Regular replacement of oil and filter elements is an important step to ensure normal operation of the transmission and extend its service life. The following are detailed steps on how to regularly change the oil and filter elements:
1. Change the oil
Preparation:
Make sure the vehicle is parked on level ground and the handbrake is engaged.
Prepare a suitable collection container, new transmission fluid, oil funnel and necessary tools.
Check your vehicle manual or manufacturer's recommendations for the type of transmission fluid required and the change interval.
Drain old oil:
Locate the oil drain plug on the bottom of the transmission and use an appropriate tool to unscrew it.
Let the old oil be completely drained, and pay attention to the color, smell and impurities of the old oil to judge the condition of the transmission.
Replace oil pan gasket (if applicable):
If the oil pan gasket shows signs of damage or aging, replace it with a new one in time.
Clean the surface of the oil pan to make sure it is free of oil and impurities, and then install a new gasket.
Add new oil:
Use an oil funnel to add new transmission fluid to the transmission.
Pay attention to control the filling amount to avoid too much or too little. The correct oil level can be determined by referring to your vehicle manual or the markings on the dipstick.
Check oil level:
After adding new oil, start the engine and let the transmission run for a while to allow the fluid to circulate.
Check the oil level again to make sure it is within the normal range.
2. Replace the filter element
Position the filter element:
Locate the transmission filter element according to the vehicle manual or manufacturer's instructions. The filter element is usually located at the inlet or outlet of the transmission oil line.
Remove the old filter element:
Use the appropriate tools to remove the old filter element, taking care to avoid damaging surrounding pipes and seals.
Install new filter element:
Clean the filter element mounting seat and surrounding pipes to ensure there is no oil dirt or impurities.
Install the new filter element in place, making sure it is firmly seated and sealed.
Check for tightness:
After installing the new filter element, check whether the seals around it are intact and make sure there are no leaks.
Please note that when changing fluids and filters, be sure to follow the manufacturer's guidelines and recommendations and use the correct fluid type and filter specification. At the same time, you should also pay attention to safety precautions during operation to avoid accidents. If you are not sure how to perform these steps correctly, it is recommended to seek help from a professional technician.