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Does universal joint need to lubricate?
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Does universal joint need to lubricate?

Views:0     Author:Site Editor     Publish Time: 2021-03-24      Origin:Site

The universal joint is an important part of the automobile power transmission system. From the perspective of automobile structure, for front-wheel drive vehicles the drive shaft uses a constant velocity universal joint, and for rear-wheel drive vehicles, its drive shaft uses two unequal velocity universal joints. General private car owners are very unfamiliar with the lubrication and maintenance of cross-shaft of universal joint. We tell you that it is important to lubricate universal joint regularly.


  • Does universal joint need to lubricate?

  • What are rules to lubricate universal joint?

  • How to lubricate universal joint?


Does universal joint need to lubricate?

YES! Universal joints need to be lubricated with grease, and the boot prevents dust and sand from splashing into the joints to damage their lubrication. Universal joints require regular maintenance, replace special grease, check for cracked boots, and loose clamps.

On the one hand, it is objective and natural wear, because the universal joint and the drive shaft are assembled to transfer torque, in a working environment with high speed and force, and the parts are inevitably worn, which is objective

On the other hand, factors such as human factors, driving technique, and maintenance, fail to follow operating procedures, rude behavior, lack of timely maintenance, and increased damage to parts.

If the chassis makes an unbroken “snap” sound when the vehicle is moving when it suddenly increases, decelerates, or steers, the universal joints may be running out of oil or damaged.

In addition to the universal joints applied to the driving system, the steering column of the steering system applies the universal joints to transfer steering forces between shafts with varying shaft lines. For ease of removal and installation, tools such as universal joints and spark plug wrenches are also applied to universal joints.


What are rules to lubricate universal joint?

Rules to lubrication universal joints:

The newly delivered universal joint are filled with sufficient grease, so there is no need to add oil. But when universal joint is stored for more than six months, it needs to be refilled before using the machine.

The universal joint should be adequately lubricated. The bearing part should be relubricated every week at the beginning of operation, and every quarter after normal operation, and the spline side should be refilled every six months.

When lubricating universal joint, you can inspect items of cross-shaft universal coupling: whether there is abnormal noise, whether the cross bag has axial movement,  whether the radial runout is normal, whether the connecting bolts are loose. If any of the above phenomena occurs, the cross-shaft universal coupling should be checked, by analyzing the cause, and repairing it.

The grease of the universal joint is degraded and evaporated to form a harder soap, which hinders the rolling of the needle. In addition, the universal joint has no oil drain device so that the deteriorated grease cannot be discharged, while the new grease is inconvenient injection. Due to the poor toughness of the butter oil film, the cross-shaft universal coupling has to withstand greater torque and alternating loads during operation, so it is difficult to form a good oil film in the bearing. Therefore, gear oil should be used for lubrication of cross-shaft universal coupling, rather than grease.


How to lubricate universal joint?

Their cross-shaft lubrication uses high-quality grease, which is compatible with universal joints in the same life span. And the universal joints of some commercial transportation vehicles, especially the existing old trucks, are still repairable.

Cross-shaft of universal joint have to withstand large torsion and alternating loads during work. In the past, the maintenance industry used calcium-based grease commonly known as "butter" to lubricate the universal joint. However, due to the poor toughness of the oil film of calcium-based grease, it is difficult to form a good oil film on the friction surface of the bearing and the journal, which is the cause of the early damage of the universal joint cross shaft needle roller bearing. In addition, due to the design structure of the old universal joint, when the repairman uses a grease gun to add grease to the inner cavity of the cross shaft through the grease nozzle, the resistance to enter the narrow inner oil groove is great because the viscosity of the grease is high. When the grease is pressured, the pressure reducing valve on the opposite side of the oil nozzle will overflow, which makes the repairman mistakenly believe that the bearing has been filled with grease. In fact, in many cases, the grease cannot enter between the needle rollers and reach the end face of the cross journal.

Therefore, the maintenance industry uses gear oil instead of grease to lubricate the universal joint. It is said that after comparative experiments, the lifespan of lubricating the universal joint with gear oil is 2 to 3 times that of lubricating with ordinary butter. However, this also requires special pressurized oiling tools, and the cross shaft needs to be removed and cleaned during the first refueling, which is more troublesome. In addition, the retention of gear oil is not as good as grease, and its lubrication cycle needs to be shortened.

Considering the above reasons, some people use 2# extreme pressure lithium complex grease, which is based on two points. First, its fluidity is better, so that it can easily reach the lubrication part. Second, the grease has good extreme pressure resistance and is suitable for working conditions of universal joint.



Learn more something about universal joints can know it is important to lubricate universal joints and how to lubricate universal joints. If you want to buy good shaft couplings with reasonable price, FOSHAN HOUZHE TRANSMISSION EQUIPMENT CO., LTD. is your best choice. Whether from quality or price, or delivery time, we can help customers to open up a further and larger market. We have all types of different universal joint, as well as shaft couplings. And if you have any questions, you can contact us or search us online.




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