Froneck
Titanium
- Joined
- Dec 4, 2010
- Location
- McClure, PA 17059
I have an old stand-on forklift that I use inside my shop because my 8000 pound Forklift is too big. It has a 12VDC Battery, large battery in metal case that would be at least 12 large car batteries in size. Battery claimed to be new with a new battery charger when I purchased it and they look it. Hydraulic motor for lift runs good and I have no problem lifting max weight and slightly more. (haven't tried exceeding max but lift works great when ever lifting anything) My problem is drive motor, it seem to be week. Been a while since I played with it but if my memory is correct 3 relays are switched to provide 3 forward/reverse speeds. A metal type flat bar is used as a resistor that taps are connected to the 3 relays, Hi speed is direct, no resistance connected. A while ago I cleaned the contacts on all the relays but it didn't help, Brushes and commutator look OK but I haven't removed the motor.
With fully charged battery drive motor is very weak. Has a hard time getting started but once it's moving will continue but having limited space I never get it up to speed, getting started is very weak, if I have the wheels cut hard it might not move.
Any suggestions where I should look? Remember it's old there is no solid state controls!
With fully charged battery drive motor is very weak. Has a hard time getting started but once it's moving will continue but having limited space I never get it up to speed, getting started is very weak, if I have the wheels cut hard it might not move.
Any suggestions where I should look? Remember it's old there is no solid state controls!