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Motorcycle Transmission Shafts

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Your Professional Motorcycle Transmission Shafts Manufacturer in China!

Moyada specializes in producing valve, clutch, main and auxiliary shafts, cams, electrical parts, cylinder, bearings and other motorcycle gear accessories. The company established a sales platform based on the integration of production enterprises, and adopted the mode of factory focus on production and platform professional sales to meet all kinds of customer needs.

Wide Product Range

We offer a variety of motorcycles engine parts, including valve, clutch, main and auxiliary shafts, cams, electrical parts, cylinder, bearings and other motorcycle gear accessories.

Professional Certificate

Certificate of ISO, TS16949 management system, and Environmental Management System Certificate all reflect the professionalism of our products. Reliable after-sales service ensures that customers can purchase products with confidence.

Rich Experience

We have more than 20 years of experience in quality, production and supply chain management, and can continue to provide customers with satisfactory products and services.

Stable delivery

We will arrange production and shipment according to the customer's schedule and order urgency, and deliver on time. The fast shipping system allows customers to receive products quickly.

 

 

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Brief Introduction to Motorcycle Transmission Shafts

 

Transmission shafts are rotating members that transmit power and torque from one location to another. In a motorcycle, transmission shafts are used to control forward, reverse, and Hi-Lo gears.

How Does a Motorcycle Transmission Work?

 

From the outside, a motorcycle transmission works in a very simple way. There is a little gear pedal on the left side of the engine, which is also known as the "gearshift lever" or "toe shifter". If you pull the clutch and press this lever down with your left foot, you can shift into first gear. If you want to shift into higher gears you just move this lever up. 

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Some Common Failures in a Motorcycle Transmission
 

Clutch Failure

The clutch sees a lot of action whether you're a beginner or not. Failing clutch symptoms include delayed acceleration, difficulty shifting, or a clunking sound when shifting. Clutches have been designed to be adjusted and/or replaced as needed. An easy first step is to adjust the cables of the clutch handle. If the problem persists, you will have to dig in further. Refer to your owner's manual for proper procedures and specifications.

01

Shift Lever Not Working

The foot-shift lever turns the shift drum to select the gear. There is a spring designed to hold the selection which is subject to wear causing the lever not to return after shifting. A simple fix could be lubricating the shift lever to free it up. Otherwise, replacing the shift lever is required to solve this issue.

02

Bearings are Worn Out

The shafts of the transmission are suspended by bearings. These bearings can gradually wear out and a worn bearing is most noticeable by the growling sound it will produce. There is a quick way to narrow down where the worn bearing is. If you hear the sound with the clutch engaged and the transmission in neutral, it is likely one of the main shaft bearings. If the noise occurs with the clutch disengaged, it will likely be a countershaft bearing. If the noise happens regardless, it is likely the clutch hub bearing. Replacing bearings is a very involved process and may require a trained technician to accomplish.

03

Shift Forks Bent

The shift forks are the components of the transmission that move the dog gears into position. They are guided by the grooves in the shift drum, so they see side-to-side movement. Improper shifting can cause these forks to bend. A typical symptom of a bent fork is that the transmission will pop out of gear. If left unfixed, the teeth of the dog gears can round off from being inadequately engaged. Correcting this issue will also require disassembling the transmission.

04

Gear Clash

Gear clash is a condition in which the tolerance, or space between, the gear teeth has widened from wear. When the clutch is engaged and puts the initial torque on the engine, the gears jump together causing a clunk or tapping sound. To prevent this condition, keep the transmission properly maintained. Older bikes are more prone to have this condition. Unfortunately, there is no quick fix for this and will often require rebuilding or replacing the transmission.

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Motorcycle Transmission Parts and Functions

Bearings

Pressed into the outer engine or transmission case, bearings allow the transmission shafts to spin free and true.

Input/Main Shaft

Driven by the engine via the clutch pack, the input/main shaft is how the transmission receives power.

Output/Counter Shaft

Driven by the main shaft, the output/counter shaft delivers power to the final drive via a sprocket or driveshaft.

Gears

  • Motorcycle transmissions have three gear types: fixed, freewheeling and slider. Two constantly meshed gears make up each gear ratio, meaning a six-speed transmission will have 12 gears:
  • Fixed gears: Fixed gears are part of, or locked to, the main shaft or counter shaft and rotate at the same speed.
  • Freewheeling gears: Freewheeling gears spin independently of the main shaft or counter shaft. They have dogs (protrusions) or slots on their sides so they can engage with a neighboring gear.
  • Slider gears: Slider gears spin with the shafts (main or counter); however, they are free to move horizontally on the shaft. As they slide to engage their neighboring freewheeling gear, they make the freewheeling gear temporarily fixed.
  • Shift fork: The shift fork(s) control the horizontal movement of the slider gears.
  • Shift drum: The shift drum controls the movement of the shift forks.
  • Shift linkage: The shift linkage connects the foot-controlled gear selector to the shift drum. As a rider moves the gear selector up or down, the shift linkage rotates the shift drum, causing the shift forks to move slider gears to engage with their neighboring freewheeling gear.

 

Some tips for maintaining a motorcycle transmission shaft

 

 
Lubrication

Lubricating the gear shaft can help improve its lifespan.

 
Oil Changes

The final drive unit requires regular oil changes. When draining the oil, check the drain plug for metal shavings, which could indicate gear damage.

 
Greasing

Grease the gears, which requires removing the wheel. This can be done when replacing tires. If the motorcycle is ridden in rain or dirt, or washed with high-pressure water, the gears may need to be greased more often.

 
Gear Shift Linkage

Check the gear shift linkage for adjustments. For ATVs and side-by-sides, the gear shift linkage is usually adjustable.

 
Shift Lever and Shift Rod

Keep the angle between the shift lever and shift rod at 90 degrees.

 

 

Our Certificate

 

 ISO and TS16949 Management System Certification

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Company Equipment

 

Advanced Equipment

 

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Common Problems of Motorcycle Transmission Shafts
 

Q: Which materials can be made for motorcycle transmission shaft?

A:

● High quality low carbon steel, such as 20, 08, SPC.

● High quality medium carbon steel, such as 35, 40, 45.

● Low alloy steel, such as 15Cr Mo, 20Cr Mo, 20Cr Mn Ti.

● Medium alloy steel, such as 40Cr, 35Cr Mo.

Q: Why is my motorcycle gear shift hard to move?

A: If your motorcycle is having a hard time shifting gears, it could be due to a dragging clutch. This means that the clutch disk drags and fails to disengage when you press the clutch pedal. The clutch is spinning with the engine which makes it nearly impossible to change gears.

Q: Why is my motorcycle shifter stiff?

A: There may be cases where the shift lever becomes hard and shifting the bike into gear becomes difficult. This is generally seen when the bike is cold. The cause is the clutch cable here. You need to readjust it by loosening the locking adjustment and then working the clutch lever a few times.

Q: How do you maintain a drive shaft?

A: Always keep your driveshaft free of dirt and grime and ensure it is well-lubricated. As with all moving parts, this will extend its life. This should be done as frequently as you change the oil in your vehicle-and make sure you use the recommended high temperature grease on all the critical parts.

Q: How long does a shaft drive motorcycle last?

A: Shaft drives require zero maintenance. The entire system is sealed in lubricant so you don't have to get your hands dirty. Most systems are designed to last the life of the engine, meaning you don't have to worry about the bike breaking down when you least expect it.

Q: What is a transmission on a motorcycle?

A: Your motorcycle comes with something called a sequential manual transmission. If you have any manual automobile experience, then you know on most cars, you can pick whatever gear you want to shift into. This allows you to jump around and shift from third to fifth gear without a problem.

Q: How does a transmission shaft work?

A: Transmission shafts are rotating members and transmit power and torque from one location to another while spindles are short shafts and axles are nonrotating shafts. Shafts can be solid or hollow.

Q: What are the three shafts of the transmission?

A: The transmission housing contains three shafts interacting with one another. One of them is attached to the engine (the input shaft), one is attached to the differential (the output shaft), and the third shaft, often called the layshaft or the countershaft, interacts with the other two via a system of gears.

Q: How does a motorcycle drive shaft work?

A: The engine runs the main shaft inside the transmission and the output shaft is connected with a propeller shaft. The propeller shaft runs the rear wheel by transferring the rotation via a 90-degree differential. For you to know, Bevel gears are used in a motorcycle differential.

Q: What is the principle of motorcycle transmission?

A: Motorcycle transmissions (the most common manual-shift kind) use pairs of gears moving laterally on a pair of shafts to change the ratios between the engine and the rear wheel. Pushing the foot-shift lever pushes or pulls these gear pairs into or out of engagement.

Q: What is the main purpose of a drive shaft?

A: The function of the drive shaft is to transfer the engine torque from the gearbox or differential to the wheels.

Q: Is drive shaft part of transmission?

A: Driveshaft: This is the shaft that is connected to the transmission and is the first component in transferring power to the differentials, axle shafts and wheels.

Q: What is the main shaft of the transmission?

A: The main shaft is a component that functions as a gear holder, bearing, synchromesh and other components. The main shaft also functions as a shaft that continues the rotation of the input shaft so that the rotation can reach the spindle.

Q: Are motorcycle transmissions automatic?

A: Automatic. Fully-automatic transmissions are far less common on motorcycles than manuals, and are mostly found only on motor scooters, mopeds, underbones, minibikes, and some custom cruisers and exotic sports bikes.

Q: How many shafts are in a transmission?

A: Manual transmissions consist of an input shaft, intermediate shaft and output shaft. The input and output shafts are each connected with the intermediate shaft. There are also several gears that enable us to travel at various speeds, with lower gears used for slower speeds and top gears operating at faster speeds.

Q: What are the two shafts in a transmission?

A: In terms of construction, manual transmissions contain two shafts; a primary shaft that is split into two parts/sections that can rotate independently of each other, and a secondary shaft that is made up of a series of fixed gears of various diameters.

Q: What is the difference between axle and transmission shaft?

A: A shaft is a rotating member that is used to transfer power. There may or may not be nor mal loads applied on it. An axle is also a rotating member but it doesn't transfer power and it only handles the normal loads.

 

 

We're professional main and auxiliary shaft assembly manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to wholesale high-grade main and auxiliary shaft assembly for sale here from our factory.

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