If its anything like a 4400 there are a few things to check. One is the linkage. One linkage for each side. The other is the tow valves on top of the hydraulic pump/control unit. There is one for each side. I do not recall right off the top of my head, but both should be orientated the same way. They release pressure on the drive motors. The other is to open up the reservoirs and see if the main drive chain has pop off. There should be two bolts on top that you loosen to slide the cover over to remove it. You will see a three sprocket and chain setup. The large sprocket goes down to the drive motor. The smaller sprockets go to each wheel.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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