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In Reply to: 4020 hydraulic problem posted by Mike on Sunday, February 08, 2004:
OK.. Found the problem. The steering valve was dumping oil causing the front pump to not keep up, stroke control oscillate, and pump chatter. What I learned from this:
1) Let the tractor run for an hour. Wherever you are losing oil will get warm. In my case it was the line from the front pump to the steering valve.
2) Be sure to check the inlet screen to the charge pump. You can access this by draining the hyd oil and removing the plug beneath the left side of the tractor under the floor board. It is a hex or square drive. When you remove it, pull the screen out and clean. It could be plugging the inlet to the charge pump.
3) Last but not least, if you find the problem like I did and correct it, you may still have to rebuild the front pump since it has taken quite a ride trying to keep up with the internal leakage. Hope this helps. Good luck.