743 good or bad

New issue!! I was using the 743 the other day and the hydrolics got slow at lifting loads of rock into my dump trailer. It would lift so far and just stop. If you wait a minute, then hit the foot pedal. it would lift a little more. I thought maybe I had to heavy a load in the bucket. Then a day later, I got in it to move it. the boom and bucket would not move at all. I was able to get the bucket off. Then I got it limped to the trailer and had no moving power at all. You could go full throttle or idle. When you pull back both sticks, it would make a lurch, however, you didn't know which side was going to move. All you got was a lurch forward or back. Then you just hoped for the next lurch to go the direction you wanted. Would it be possible for the hydrolic filter to be that plugged? Thanks for any suggestions.
 
Shall we assume your main filter isnt clogged?
Main filter, do you mean the hydraulic filter above the battery? I asked the guy that is supposed to be working on it, he claims that can't be it. Can it??? Or is there another filter I don't know about? Thanks
 
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