Hi,
I recently purchased a Hyster H2.50 xm with this problem.
Once you start it up it engages forward drive.
The brake will hold as normal.
It pulls forward in forward / Neutral and reverse.
When in reverse if you accelerate it will then pull backwards with a bit of a jerk. and if you lift your foot of the accelerator it will pull forward again.
I don't have a manual for the machine
Any help would be appreciated.

Regards Steve