Eaton 18 speed transmission problems

In this brief guide, we are going to provide you with common problems with Eaton 18 speed transmission and what you can do to rectify these problems before they worsen.

Eaton Fuller 18 speed is manual transmission and one of the most popular transmissions on the road. Available in direct-drive and overdrive models, this 18-speed manual transmission can handle both on-highway and vocational applications.

Manual transmissions have a global reputation for quality, reliability and durability. However, there are many problems with manual transmissions and we’ll tell you why and how you can solve them.

What are the common problems with Eaton 18 speed transmission?

Some of the most common problems with Eaton 18 speed manual transmission are:

  • Vibration and shaking
  • Transmission slippage
  • Transmission overheating
  • Loud and whining noise
  • Difficulty shifting gears

Why is Vibration and shaking a problem with Eaton 18 speed transmissions?

Because vibration and shaking would mean the Eaton 18 speed transmission is not functioning smoothly as manual transmissions are designed for and also they are meant to be a smoother drive than early ones. This could cause very unpleasant driving and passenger experiences.

What are the signs of this problem with the Eaton 18 speed transmission?

Vibration itself can be taken as a sign of this Eaton 18 speed transmission problem because manual transmissions are not meant to shudder when loaded or accelerated.

How to solve this Eaton 18 speed  transmission problem?

Visiting your trusted mechanic or service center at the earliest is possibly the only way to fix this issue as the internal mechanical components or dampers might be worn out and it requires experience and expertise to repair this problem.

Why is Transmission slippage a problem with Eaton 18 speed transmissions?

Eaton 18 speed transmission system is not designed to slip and if you are experiencing slippage then it could cause slow response or further damage to the transmission system. So, it is definitely a sign of a problem with the mechanical components of the transmission.

What are the signs of this problem with the Eaton 18 speed transmission?

You will be able to hear the gear slip while driving and this would be a good sign if there is slipping. Also, an error code will be displayed if you use a diagnostic tool.

How to solve this Eaton 18 speed  transmission problem?

The solenoids of the two gears might be worn out and need to be replaced. Also, there is a chance that these solenoids might also be broken. Rarely, complete mechanical failure occurs with these transmissions.

Why is Transmission overheating a problem with Eaton 18 speed transmissions?

Because Eaton 18 speed transmission mechanical components tend to get damaged, worn, and malfunction under high heat levels. This results in lower than the acceptable performance from the vehicle and high fuel consumption as well as lowering the life of the gearbox.

What are the signs of this problem with the Eaton 18 speed transmission?

Generally when a Eaton 18 speed transmission overheats an error is shown. This error is not immediately visible on the screen but requires a diagnostic tool to get these actual error codes.

How to solve this Eaton 18 speed  transmission problem?

After cooling down the transmission check the gearbox oil for its condition. Change it if it is too thick and completely black. Also, check your clutch if it is the problem behind this malfunction.

Why is Loud and whining noise a problem with Eaton 18 speed transmissions?

These Eaton 18 speed transmissions are not manufactured to make such loud and unusual noises and if you are hearing such unpleasant noises while driving then you should check with your mechanic as this might get a serious damping issue.

What are the signs of this problem with the Eaton 18 speed transmission?

You will hear these noises while driving and will be very unpleasant to your ears which can be taken as a sign that the transmission is having some problem.

How to solve this Eaton 18 speed transmission problem?

Normally this sound means that a component within the assembly needs to be replaced as it might be fractured. The entire assembly from which the sound is coming must be removed and rebuilt to fix this problem.

Why is Difficulty shifting gears a problem with Eaton 18 speed transmissions?

You would want a seamless and easy shift even at low throttle input, so if your Eaton 18 speed  transmission is shifting harshly or with difficulty even at low speed then there is definitely a problem.

What are the signs of this problem with the Eaton 18 speed transmission?

You would immediately notice and sense if the Eaton 18 speed transmission is shifting with difficulty from one gear to another as this is one of most important issues with Eaton.

How to solve this Eaton 18 speed transmission problem?

Firstly try replacing the transmission pressure sensor, if that doesn’t work then check for an oil leak in the servo assembly of the particular gear. These are primarily two fixes for this problem.

How to precisely diagnose these common problems in Eaton 18 speed  transmission?

To properly diagnose these problems, you need a scan tool to read these codes from the Transmission Control Unit. Firstly, If a Eaton 18 speed transmission is malfunctioning, it immediately informs the driver with an error message on the screen.

How to prevent getting these problems in the first place?

Regularly changing your gearbox oil and other lubricants may save you a lot of trouble and money in the future. Although many experts suggest different number miles for servicing, your car manual will give you a proper recommendation when you should change it.

FAQs: Eaton 18 speed transmission problems

Are 18 speed transmissions good?

Yes, versatility is the best feature of the 18 speed. The 18 speed transmission is strong, versatile and easy to use, once you get the hang of the pattern and if you are experienced with manual transmissions. It’s not the easiest of transmissions if you are just starting to learn to drive a tractor trailer. 

What causes a manual transmission to not go into gear?

Usually, it is to do with a problem with a loose linkage, worn shift cables or worn bearings. Other causes for a hard-to-shift manual transmission include: Worn or loose internal parts (shift fork, levers, shafts) Low oil level (or the incorrect kind of oil).

Conclusion

In this brief guide, we have provided you with common problems with Eaton 18 speed transmission and what you can do to rectify these problems before they worsen.

If you have any questions or comments please let us know.

Citations:

https://www.partsxp.com/blog-eaton-fuller-18-speed-transmission-troubleshooting

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