I know it has been years since the last reply, but I am having the same problem with the same forklift. It has no power in drive or reverse, monotrol setup, and if it is revved at all during the first ten minutes of warm up the hydraulic pump losses prime. Will be replaceing suction hose soon, looked at hydraulic filter and it certanly easnt covered with gunk. Not sure where to head from here, I dont have a manual yet. Other than not having any power, once limped to full operating tempersture the hydraulics work great. Thanks.
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