2 minute read
Potentiometer
F-code Section C-code
PS S4.1 4110 Steering Handle Head
Version no T-code
000
4. Potentiometer
The accelerator potentiometer is accessible inside the control handle head by removing the switch plate. The accelerator potentiometer operates off a gear toothed shaft (rack) that is moved when the travel controls are twisted. 1.Park the truck on a level surface and make sure parking brake is applied. 2.Release pressure in hydraulic system by pressing the lowering button on steering control handle. 3.Disconnect battery from unit to prevent accidental operation. 4.Remove the six retaining screws (38) from outer edge of the switch cover (39).
5.Lift switch cover assembly plate off assembly and lay to one side. 6.Disconnect head wiring harness from stem wiring harness and remove potentiometer wires from head wiring harness plug. The wires are removed by pushing terminals out the back of head wiring harness plug.
7.Remove two screws (30) securing potentiometer assembly (24) to control head housing (9).
Remove and discard potentiometer assembly (24) and gear (25). Replace with new. 8.Install new potentiometer assembly (24) and gear (25) on control head housing (9) and hold in place with screws (43). Do Not tighten completely. 9.Connect ohmmeter leads to potentiometer wires. 10.While holding potentiometer bracket (24) against control head housing (9) and make sure gear (24)
NOTE!Do not remove center screw (2) and nut (27).
NOTE! Remember or marking the wire terminals position when removing to make installation easier.
F-code Section C-code
PS S4.1 4110 Steering Handle Head
Version no T-code
000
on potentiometer are engaged with return (7) gears teeth. In neutral ohmmeter reading should be 5500 to 6000 ohms and will reduce to below 50 ohms as the travel controls are operated to high speed. By sliding potentiometer assembly (24) up or down as necessary taking measurements and make adjustments.
If slotted holes in potentiometer bracket (24) do not allow enough adjustment bracket may be lifted slightly and potentiometer drive gear (25) can be rotated by one tooth. 11.Tighten potentiometer assembly (24) mounting screws (30) and install potentiometer wire terminals in head wiring harness plug. 12.Test operation of potentiometer gear (25) and return (7) by moving travel controls before installing switch cover plate assembly on head. 13.Install switch cover plate assembly back in place and secure with six screws (38). 14.Connect battery and test operation of all control handle functions.
Testing drive function is made with drive wheel blocked off the floor. Risk of serious personal injury or possibly death may occur from run way truck.
