Huzhou Daixi Zhenhua Corporation (HDZ), a private company

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Huzhou Daixi Zhenhua Corporation (HDZ), a private company

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Huzhou Daixi Zhenhua Corporation (HDZ), a private company

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Welcome to
Huzhou Daixi Zhenhua Corporation

Motorcycle &
Tool Cart

Zhenhua Tech & Trade Co., Ltd is

China Motorcycles Suppliers,Electric Bikes and Agricultural Appliances Manufacturers

,We manufacturer variety of motorcycles,electric bikes,auto parts,garden equipments,and other products.
About us

Huzhou Daixi Zhenhua Technology & Trade co., ltd (ZHT) with a registered capital of 12 million RMB established in 2002, mainly engaged in leisure motorcycles, electrical cycles, electrical barrows, RV accessories (gas range, water heater, awning etc. ). Business receipt reached 20 million USD per year.
ZHT is located by No. 104 National Highway, Daixi Town, Huzhou City, Zhejiang Province, China. Located 60 Km from Hangzhou, the capital of Zhejiang Province and 180 Km from Shanghai. The company employs 615 employees including 66 managing members and 72 professional technicians and mechanics. The company totally has 110, 000 square meters in land and 90, 000 square meters of building. The new expansion of 66, 000 square meters of land and 48, 000 square meters buildings are under production and nearly completed.
ZHT has 4 assembly lines, 4 paint lines, over 400 sets of various operating machines and 80 sets of detection devices. All these machines are state of the art equipment. The manufacturing capabilities include 100, 000 sets of leisure motorcycles, 50, 000 sets of electrical barrows, 300, 000 sets of RV gas ranges and water heaters, 60, 000 PCS of motorcycle frames, 300, 000 PCS of motorcycle spare parts.
ZHT exports its products to over 30 countries, include USA, Japan, Australia, most European countries, and some Southeast Asian countries. The company has maintained the ISO9001 Quality System Certification since 2003, and also owns 48 patents and some certifications by CE, UL, CSA, EPA, EEC, ADR, etc.
Huzhou Daixi Zhenhua Technology & Trade co., ltd will provide the best products and best service to every customers and looking forward to working with you!

  • Customization
  • Good Service
  • Multiformity
  • High Productivity

News Centre

  • Routine maintenance of shock absorber

    The shock absorber oil uses the resistance of oil flow to consume the energy brought by the drive. When the cylinder piston in the shock absorber moves under the action of external force, the oil flows at high speed through the damping channel, and the friction consumption function converts it into heat. Therefore, the shock effect of the motorcycle is weakened until it disappears. In addition, the shock absorber oil also needs to lubricate sliding parts and prolong the service life. Therefore, the motorcycle shock absorber oil must have good rust and abrasion resistance.

    Open the suspension top cover to check the entire suspension, observe the operation of the suspension mechanism and the viscosity of the oil

    After waiting for the suspension oil in the tube to drain, start removing the oil seal and gasket.

    When disassembling the oil seal card spring, you must pay attention to it, and wrap it with something to prevent the card spring from flying away.

    After removing the retaining spring, pull the shock-absorbing white rod and the shock barrel firmly, and the shock is successfully disassembled.

    Manually sand out some burrs on the spring groove to make the shock absorber run more perfectly.

    All parts are installed after regular cleaning and maintenance, because the wiper tongue of the shock absorber oil seal is very delicate. In order to prevent the shock absorber oil seal from being damaged during installation, you must apply a little oil when installing the shock absorber oil seal. Next change the suspension oil, I believe it will give the owner a better driving experience. By the way, a point of knowledge is that the shock absorbing oil has a viscosity. The 5W and 10W labels on the oil bottle are the viscosity of the engine oil. The higher the viscosity, the greater the resistance to the mechanical part. Generally heavy machinery and highway driving are mostly suitable for using 10W shock absorption oil to obtain better curve support performance; small displacement motorcycles, off-road motorcycles are more suitable for riding on bumpy roads, and 5W shock absorption oil is more suitable. Make shock absorption softer and reduce bumps on the road.

    After adding new damping oil, reassemble the shock absorber and wait for loading. The shock absorber returned to the motorcycle. The shock absorber is still the original one, but I believe the effect is no longer the same.

    Routine maintenance:

    (1) Pay attention to the regular cleaning and dust removal of the shock absorber to minimize the cause of oil leakage. In particular, the shock absorber of the structural form similar to the RX125 model has basically exposed working strokes and is in direct contact with dust. very necessary. Practice has proved that dust is an important factor that causes the shock absorber to leak oil quickly.

    (2) When the motorcycle is not in use, be sure to pay attention to the oil protection of the working stroke section of the shock absorber to prevent corrosion and rust of the shock absorber.

    (3) Check the fastening of the shock absorber before each ride to ensure driving safety. At the same time, you should also observe the oil leakage of the shock absorber to determine whether it needs to be disassembled or repaired to ensure that the shock absorber is always in normal working condition.

  • How to adjust the motorcycle shock absorber

    Benefits of adjusting motorcycle suspension:

    On our motorcycles, there are two suspension components: one on the front wheel, often called the front fork, and the other on the rear wheel, often called the rear suspension. Like cars, there are two most important suspensions, It is a function we know. Everyone knows that the rough terrain brings vibration to the car body, and the suspension makes the ride more comfortable. At the same time, it keeps the tires in contact with the ground to ensure that the tires output power to the ground. However, unlike the automobile, the motorcycle ’s Suspension will also greatly affect the handling and cornering stability of the motorcycle.

    The suspension generally consists of two parts: a spring and a damper

    The spring is the main part of the suspension. This spring is like the spring we usually use in ballpoint pens, but it is much stronger. The spring absorbs the impact force of the ground through the elastic member and ensures the contact between the tire and the ground; the damper is a device for controlling the spring tension and rebound force.

    The damper is like a pump filled with oil. The speed of the air pump moving up and down depends on the size of the passage hole and the viscosity of the oil. All motorcycles have springs and dampers. The springs are hidden on the front forks. The rear shock absorbers are The springs are exposed, and the suspension on the front and rear wheels works separately, and can respond to road conditions and riding styles.

    Preparations for adjusting the suspension: Find the original user manual. This booklet includes: what you can adjust, where the screws and knobs of the front and rear suspension are located, and the manufacturer's recommended suspension settings (if you use a modified suspension like Ohlins, you need to contact the manufacturer to obtain (Recommended data for suspension settings) These are very useful information.

    Depending on the model, we can usually adjust all or a few of the following:

    1. Preload: spring tension based on weight

    2. Damping: the speed of spring contraction and rebound

    3. Compression: deeper level of damping control, mainly controlling the speed of spring contraction

    4. Rebound: a deeper level of damping control, mainly controlling the spring to return to normal speed from the compression state (the compression ratio and the rebound ratio are part of the damping)


  • Tools to be prepared for the maintenance of motorcycle shock absorption

    (I) There are shock absorbers for 50, 70, 80, 90, 100, 125, 250, 750mL and other common models in China, which can be roughly divided into two types: spring type and spring hydraulic type. Displacement-oriented motorcycle shock absorbers are mainly spring-type, and displacements of 70mL and above are mainly spring-hydraulic. Spring-type shock absorbers mainly rely on springs to cushion vibrations and rely on mechanical friction or air damping. But because it does not have the problem of oil leakage, the strength safety factor is also large, and the structure is simple, the manufacturing is easy, the maintenance is easy, and there are few failures, so it is still widely used.

    (2) Tools to be prepared for the maintenance of motorcycle shock absorption:

    Damping removal wrench, remove the rubber cover on the front of the shock absorber, pull out the stop ring, remove the cover, gasket, inner sleeve and shock-absorbing spring, and then pour the hydraulic oil inside the shock absorber clean. Clamp the shock absorber in a vise (be careful not to clamp it too tightly), use a wrench to hold the piston rod, and use an inner hexagonal wrench to loosen the fastening bolt at the root of the outer fork tube to remove the inner fork tube and other components , Its installation is performed in the reverse order of disassembly and disassembly. Front shock absorber cleaner to remove grease and smoother shock absorption!

    The main points of assembly are:

    (1) When installing the oil seal, the main lip should face into the outer fork tube, the dust-proof lip should face outward (that is, the numbered side of the oil seal faces outward), a small amount of grease should be applied to the lip, and then use a wooden block and a hand hammer Gently drive the oil seal into the outer fork tube (or screw it in with a special tool).

    (2) All parts must be cleaned before assembly.

    (3) The main lip of the oil seal must not be scratched.

    (4) When installing the oil drain plug, do not leak the sealant or gasket.

  • Compression damping is the force required when a shock absorber is compressed by force

    What exactly is the adjustable damping?

    This matter depends first on whether your shock absorber supports adjustment. The preload is adjustable. The spring can be tightened, or the oil or gas can be increased or decreased, so that the shock absorber can match the current load of the vehicle. The condition of the bottom of the frame.

    Adjustable damping can be subdivided into adjustable compression damping and rebound damping.

    Compression damping is the force required when a shock absorber is compressed by force. The greater the compression damping, the harder the vehicle ’s shock absorption. Conversely, the smaller the compression damping, the softer the shock absorption. As for the specific soft and hard strength, you need to adjust it according to your actual needs. If you're going into the mountains, you need harder shock absorption for more sporty vehicle control. And if you want a comfortable driving experience, you can reduce the compression damping appropriately.

    Rebound damping can be said to be the "reaction force" of compression damping, which is related to the rebound speed after the shock absorber is compressed. The smaller the rebound resistance, the easier it is for the shock absorber to recover from compression, and the faster the rebound speed, which can provide better support, but the potholes on the road surface will be more directly fed back to the vehicle body.

    If the tire is a motorcycle shoe, then the shock can be said to be the knee joint of a motorcycle. While providing support, it can also buffer energy absorption according to demand, keeping the body stable. Major manufacturers have also made a lot of efforts to adjust their own suspension. Generally, the original factory settings can meet most of the road conditions, and the specific settings need to be modified according to individual driving needs.