Hello to anyone who can help. A malfunction of the forklift is not good working lifting ( forklift is able to drive ). DC Pump motor is controlled by thyristors... after pulling a lever for LIFT ( turning a lift switch on and moving with a potentiometer ) motor goes to the maximum power - no reaction to position of potentiometer, no change of the speed. "Electronic box" consists from : 1. CPU BOARD 2. PUMP DELAY/OVER SPEED/LIMIT MODULE 3. P500 PUMP LOGIC MODULE + 3 thyristors, 1 diode. Could you give me any information ? What I should focus to ? 1 ? 2? 3? Could you send me any manuals or schematics ? Thanks a lot , vlado