Piston not working in one direction any more

[Digger_Bear]

Hi Guys,

Hopefully someone can point me in the right direction on this problem.

I was using my excavator on Sunday, and after a while I noticed the bucket was stuck so I manually moved it and it worked again, then not long after I tried shortening the piston but wouldn’t move tried other way but that worked but it will not shorten at all under hydraulic power. And I can now manually move the bucket piston, where the other pistons are locked solid to manual moving.

The piston, pipes or oil cooler was warm but not hot. Cannot see any noticeable leaks and all the other pistons are working as intended.

It’s a Magom HRC Excavator, pump and pistons.

Thanks in advance.

Ian.