bobcat steer loader

I'm not sure if this search will have any results. Thought it might be a shot in the dark, or maybe some of you guys can tell me where to search. Man tells me his skid steer will start turning too one direction by itself when traveling straight, also the bucket will lower itself, and jack up tractor while not running over a period of time. Or maybe someone can tell me where I cam find a hydraulics schematic and pressure settings. Thank guy's.
 
Model of it will help us help you. I have messed with the Bob cat 371 which if I have the number right has a single cylinder Koler engine in it. I have also messed with a 530 which has a 4 cylinder Wisconsin engine and also another one that was diesel. Bobcat makes a goo many models and the fix while maybe close may not be the same. By the way it is common for them to drive off to one side or the other all it takes is a bump etc. to cause them to go to the side due to more pull on that side. I have manuals for the 731 and the 753 by the way
 
Your best bet will be to order service manual for your specific model. You can find them on CD on Ebay, other places.

As for running in a straight line, few will run straight without constant correction. Even worn or mismatched tires will have an effect.

If like the one I work on, there are steering links under the tilt cab that control the drive pump valves. They have pinch bolt clamps that hold the arm to the square valve shaft. If it comes loose the valve will not center when the lever is centered. Other components there that all work together to center the valve. Not too complicated if you are mechanically minded, a manual definitely helps.

Same thing with the bucket and arms, the detent should center the pedal when released. Either something worn, loose or out of adjustment.
 

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