Earth Force 25 HP desil back hoe

[supertiger]

I bought a 2001 Earth Force Kobota powered back hoe, it has the 25 hp engine and it is compleatly hydralic there is no transmition only hydralic moters and pumps. This is back hoe company that was bought out buy Bob Cat and is now sold by them. I bout this tracter used with only 15 hours on it two years ago, my problem is that when im pushing dirt with the front end loader at high RPMs the forward movement of the back hoe slows down like its lost power the engine dosnt bog doun at all, and i also notice that if i bring the engine throatle back to idle and then push the dirt the power come back strong, but since im at low throttle i have to re applie the full throatle to keep the engine from stalling. I think there must be some kinda hydralic releif valve malfunctioning and when i pull back on the throattle it resets and then it will push with good power again. Is there something i can ajust or replace to bring back the full power to the forward and reverse of the back hoe?

 

[supertiger]

oh i guess im the only person to have this problem?

 

[Bird]

MChalkley is the only other member that I can recall who owns (or owned) an Earth Force machine and we haven't heard from him in quite awhile.