i am over this hydraulic excavator stuff!

[cosworth34677]

ok i just got my exacator and wheel loader working great new pumps and hoses , also rebuilt the valves in both! butt!!!!!!!! now agian the old problems are coming back? slow moveing cyclinders pumps with no power, and leaks everywhere!

the excavator is the big problem. monday it was running great, wedsit started screwing up, the valve leak inside i guess because it wont hold the arm, and now its moving slow with no power!!!! what the h&!! is going on?
i can give you pics and any info i can, but i need so help guys! please no it cheap part type of comment because the loader is using the same stuff and it works like a champ all day! any idea?