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643 bobcat no drive

 
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churchville1
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PostPosted: Sat Aug 15, 2009 6:23 am    Post subject: 643 bobcat no drive Reply to specific post Reply with quote
i have a 643 bobcat that lost all forward and reverse drive on both sides, the bucket hyd work fine. i checked the hydro pumps and they look fine inside wear plates ok, has zero pressure on pressure tap on top of port valve, 40 micron bronze filter clean and neither the cold start or pressure bypass valves are stuck. removing the center hose on port valve (charge pressure ) i have some pressurized fluid but without resistence with hose of do not know how much. i thinh it supposed to be 75lbs reserve. at the pressure tap theres none. very agrivating. any advice would be great.
 
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