Caterpillar TH514:
Cat TH514 - Hydraulic Problem

Hello everyone! New to the forum.

I have an issue that has me kind of confused. Hoping someone can help me out. We have a TH514 that broke one of the pins holding the left cylinder on the rear of the machine that I thought was a lift cylinder...apparently CAT calls them tilt compensation cylinders.

At first we thought that someone had hit the machine and broke the cylinder off but after a closer look, it seems like the cylinder was not working properly and broke itself off. When we pull the joystick back to lift the boom, the cylinder does not move together with its partner on the other side of the boom. It only moves when we hit the button to tilt the forks. Doesn't seem right to me!

So I thought maybe a bad solenoid. Looked in the back at the control valves and realized that the fork tilt cylinder and two back "compensation" cylinders are all plumbed together. Now I'm stumped! What the **** do those "compensation" cylinders do, and why would it function that way???

I don't want to reconnect the cylinder and have it break again. Any help is greatly appreciated!
  • Posted 10 Dec 2016 10:04
  • Discussion started by rudy_g
  • Florida, United States
Showing items 1 - 1 of 1 results.
I realize this is an old post but i figured I would share my experience with this anyways as it happened recently to our TH514C

We have had this happen twice now. Once the eye on the end of the cylinder actually ripped apart and the other time thankfully the cylinder was put incorrectly and was able to slide off the bushing. In our application the operators are used to running a JLG and they always drive around with the attachment tilted up all the way. So if you have the boom up and the attachment tilted all the way up and you go to let the boom down the two compensation cylinder can't compensate and tilt the attachment up farther while you lower the boom. It seems there is no bypass valve or it doesn't work fast enough and over time you will end up with a catastrophic failure. We have mandated that the attachment whether it be forks or bucket etc should remain level as much as possible to allow for the compensation cylinders to do their job. I think the biggest issue is lifting and lowering the boom with your attachment tilted all the way up or down. Seems like a really bad design and I did talk to a CAT Engineer about it. However the machine now is too old for them to really care about it anymore. Hope this helps some more people with this problem
  • Posted 22 Aug 2020 03:01
  • Reply by CJ_Brown
  • Alberta, Canada

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