46 - FORM NO. 56043056 ConvertaMAX™ 20/26 / BA 550/650
WHEEL DRIVE SYSTEM
FRONT
M
O
L
N
P
Q
Paddle forward
stop screw
Centering springs
(return to neutral)
5K POTENTIOMETER TESTING AND REMOVAL (FOR MACHINES BUILT AFTER DEC. 1, 2000)
WARNING!
Disconnect a battery cable at the battery pack before servicing.
Testing the 5K Potentiometer
Note: The potentiometer (pot) doesn’t have to be removed from its housing mount to test.
1
See Figure 8. Remove the front drive paddle Cover (L) from the rear (back) (M) held together with (4) item (N) Screws.
2
See Figure 9. Observe the 3 wires connected to the pot and disconnect. Note the proper wire numbers and/or colors and their terminal connections for
re-assembly.
3
Test the Pot (O) using an ohmmeter, the potentiometer specification is 5K Ohms. Connect the meter leads to each of the outside connections (1 high &
3 low) on the pot, it should read approximately 5000 ohms (range 4500-5500 ohms).
4
Next, take the 1 high pot connection test lead and connect to the middle connection (2 wiper), then push and pull the rear cover to turn the shaft in both
directions. The readings should be approximately half the total resistance (2500 ohms) towards 5000 ohms and 2500 ohms towards 0 ohms. Example
“A” total resistance of pot 4840 ohms (1 high/3 low) test connections. Example “B” test middle connection (2 wiper) and outside rear (3 low) Fwd reading
2420 ohms to 4700 ohms, Rev 2420 ohms to 230 ohms.
5
Testing Summary: The above tests are to show the increase and decrease of the pot through its working range. If you do not get similar readings replace
the Potentiometer (O).
Potentiometer Removal
6
See Figure 10. Loosen the pot shaft anchor nut and unthread it to the end of the shaft.
7
Back out the Screw (P) from the pot Fork (Q).
8
Maneuver the pot out from its mounting bracket hole and separate the Fork (Q) from the shaft end.
9
Finish unthreading the anchor nut from the end of the pot and then remove the pot completely from the handle mount.
10
To reinstall a potentiometer see the
Potentiometer Installation and Adjustment
section in this manual system.
FIGURE 8
POTENTIOMETER INSTALLATION AND ADJUSTMENT (MACHINES BUILT AFTER DEC. 1, 2000)
WARNING!
Disconnect a battery cable at the battery pack before servicing.
WARNING!
The adjustment of the potentiometer is to set the drive paddle for a neutral drive motor operation. If the potentiometer is not adjusted
properly, the machine could move in either forward or reverse without any operator input.
1
See Figure 10. Install the pot and washer into the handle mount hole, then tighten the anchor nut.
2
Install the Fork (Q) on the end of the pot shaft and paddle bracket drive pin as shown. Note: Do not tighten the fork/shaft Set Screw (P) at this time.
revised 7/02