Was wondering if anyone seen this problem? The engine in the upper deck idles up but I dont have any of the hydraulics working and the gradall will not move either from the upper deck motor. The gradall will drive from the lower engine but when you are going to work from the top engine the hydraulics will not function. I changed the hydraulic filters and still nothing. The pump drive that mounts behind upper deck engine has been replaced and still nothing. This pump drive was replaced because it was all messed up when it was removed to inspect. This is were the pumps get their pressure from the pump drive engaged with the flywheel but still no change in the hydraulics. Anyone worked on these gradalls?:Banghead
1998 gradall excavator xl 4100 hydraulics not working
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