Upon shifting to FWD (or Rev), I can hear the solenoid on the transmission engage. Pressing the gas, if in a flat area, the forklift will move slighly in the direction of the shift, but it has no power thereafter to move or climb. If I press the gas pedal slighly and release several times while on fwd or rev (seems also,that if I play with the up/down hydraulic) "something" engages and now has power. Upon shifting out and then in again, same problem. Transmission and hydraulic oils are good.