Thanks for ask how I sow It have back control card on thyristors in manual is A9 card and on her is a lot of switches small and potentiometers but they works all about first speed second speed and battery calibration cut of no potentiometer who works control motor speed steering of motor.Forklift works but on stand by when you turn steering wheel pump motor turns on very high speed about 1500rpm and must on about 700rpm and it is problem.I dont know is it speed sensor problem that dont reed this operation good or is control card problem or have only adjusted potentiometer for this.