If you are getting Hydraulic lockout, static return to neutral, you have a bad mini-lever module. Hyster had a serious issue with these some time back. There was a group of trucks that had an extended warranty for the mini-lever module. Hyster had so much trouble, they recommended changing the whole assembly. You can check the serial number with the dealer to find out about warranty. If not, hold on tight to the wallet. Those modules are not cheap. Mini-levers are the cause of the fault.