question Rear hydraulics problem - Zetor Proxima 120 Power

[nikson]

Hello guys!
A problem appeared on the rear hydraulics of my Zetor Proxima Power 120 (2014 year of manufacture). Tractor is equipped with EHR hidryulic sistem. When I lift the rear hydraulic arms there is a lot of squeaky noise despite everything being greased. The problem shows itself when I try to lower the rear arms - they won`t go down under their own weight like they are supposed to. If I want to lower them when nothing is attached on them, they wouldn`t go down unless another person steps on them. They eventually lower, while again making a lot of noise.
Does anyone know what the problem might be? Thanks for all the answers.

With regards, Zetor driver

 

[ixer0]

The lift rams get tight on them. The grooves that hold the seals get rusty and swell the seals so they are very tight on the piston.

 

[nikson]

The lift rams get tight on them. The grooves that hold the seals get rusty and swell the seals so they are very tight on the piston.

Thanks for the reply!
Do I need to change the whole rams? Or is the problem repairable?

 

[ixer0]

Hi, you can re-seal the rams. You may need a die-grinder to clean the grooves for the seals. There's a snap ring on the bottom of the piston which you have to flick off through the union hole. Have fun !!