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Modern Tractor Discussion Board 643 bobcat no drive [ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ] Posted by churchville1 on August 15, 2009 at 07:23:05 from (69.140.109.75): 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. Replies: Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Optional Video Title: Optional Video URL: Advanced Posting Options Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.   Advanced Posting Tools   Upload Photo  Select Gallery Photo  Return to Post