We have what I think is a 2000kg Jungheinrich Gas forklift. Cannot seem to manage to find the serial plate on it. Turns over and starts fine. Directional shuttle lever is in neutral (interlock works fine as it will not allow you to start in forwards or reverse). Handbrake interlock also seems fine as it will not let you start the truck without the handbrake on. Truck runs for probably four seconds and then slowly dies (you can hear the hydrostatic transmission under load). I have lifted the front wheels of the truck off the floor and attempted to flick the handbrake off when the truck fires allowing it to free wheel, but no joy.

Assume is a wiring fault? Or could be a stuck shuttle valve somewhere on the machine. Not much experience of this particular truck.