MULTIQUIP TuffTruk EB500, Operation Manual

PAGE 22 — TB12SE/TB12PE TUFFTRUK POWER BUGGY • OPERATION MANUAL — REV. #0 (04/01/22)

5K OHM POTENTIOMETER REPLACEMENT

The speed on the the electric buggy is controlled by a 5K 

ohm potentiometer. This potentiometer provides a 0~5 VDC 

input signal to the motor controller via pin-13. Reference 

wiring diagram.
Use the following procedure when installing a replacement 

potentiometer. Reference Figure 21.
1.  Lift the buggy and place wooden blocks at the front 

and rear of the buggy. Place blocks so that the front 

and rear wheels can rotate freely just above the ground

2.  Remove the four screws that secure the control panel 

to the frame.

3.  Carefully set control panel down.
4.  Unhook the clip attached to the FWD/REV speed clevis 

(Figure 21Figure 21

A

). Position the clip downward.

5.  Next, remove the spring (Figure 21

B

) from the 

FWD/REV speed clevis.

6.  Remove the FWD/REV speed clevis (Figure 21

C

) from 

the throttle arm.

7.  Position the FWD/REV cable (Figure 21

D

) away from 

throttle bracket.

8.  Remove the two bolts (Figure 21

E

) that secure the 

throttle bracket to the frame.

9.  Loosen the nut (Figure 21

F

) that secures the 

potentiometer to the throttle arm.

10.  Slide the throttle arm (Figure 21

G

) off the output shaft 

of the potentiometer.

11.  Remove the nut that secures the potentiometer to the 

throttle bracket (Figure 21

H

).

12.  Next, unsolder the 

WHITE

, 

BLACK

 and 

BLUE

 wires 

connected to the potentiometer (Figure 21

I

). Mark 

orientation.

13.  Solder the 

WHITE

, 

BLACK

 and 

BLUE

 wires removed 

in step 12 back onto the 5K ohm replacement 

potentiometer in the same orientation.

14.  Install new 5K ohm potentiometer back onto throttle 

bracket and secure with retaining nut.

15.  Reinstall throttle arm back onto output shaft of 

potentiometer. Do not tighten retaining nut at this time.

16.  Reconnect the FWD/REV speed cable and associated 

hardware back onto throttle bracket.

Figure 21. 5K Ohm Potentiometer Replacement

5K OHM

POTENTIOMETER

UNSOLDER (3)

B

SPRING

FWD/REV

SPEED

CLEVIS

C

CLIP

A

NUT

BOLT

G

H

FWD/REV

CABLE

THROTTLE

ARM

D

NUT

POTENTIOMETER

E

F

I

MAINTENANCE