Welcome to JUST ANSWER heavy equipment. With years of experience, I look forward to doing my best to help. Does the unit have monitrol pedal for f/r ? Or does it have two brake pedals and a shifter on the column? All forklifts have an inching valve built into the control valve. It is controlled either with a brake line from the brakes, or a piece of mechanical linkage that goes from the brake linkage to the valve body. If the inching valve is partially open, the unit will not drive as it should. Did problem come on suddenly or get worse over time.? Let me know. Thank you.
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