Nilfisk-Advance CMAX 28/34ST Service Manual

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Nilfisk-Advance CMAX 28/34ST Service Manual Manual pdf 52 page image

FORM NO. 56043071 CMAX ™ 28/34ST / I-MAX™ 28/32C, BA 750/850ST, BA 750C - 51WHEEL DRIVE SYSTEMGRARED/BLKRED/BLKWiper output tospeed control(pin #5)Wiper inputfrom R1STVFRONTUQFRONTRPBLK #1BLK #2GRN/YEL3High 1Low2 Wiper5 Reconnect the ohmmeter test leads to the pot wiper and low terminal connections and adjust (turn the pot) to obtain half of pot’s totalresistance. This will accurately set the true neutral drive paddle operator position.6 Tighten the anchor nut secure. Note: Do not turn the potentiometer shaft when tightening. Reconnect the battery connector and turn thekey switch on and test the drive system for proper FWD and REV operations. Note: The dash panel maximum speed control knob shouldbe turned to the full speed position for testing.25K WHEEL DRIVE SPEED LIMIT POTENTIOMETER TESTINGWARNING!Disconnect the battery connector before servicing.Note: The potentiometer (pot) should be removed from the handle housing to easily test.FIGURE 9FIGURE 11FIGURE 10POTENTIOMETER INSTALLATION AND ADJUSTMENT (CONTINUED)1 See Figure 11. Remove the Set Screw (S) (5/64"wrench) and pull off the Adjustment Knob (T) fromthe stem of the pot.2 Remove the rear electrical access panel securedwith (6) Screws (U).3 Remove the pot’s anchor nut (1/2 inch wrench)then pull the Pot (V) and wires out from theelectrical compartment.4 Observe the proper wire colors and their correctterminal connections to re-assemble.5 Disconnect all three wires and test the potentiom-eter (V) using an ohmmeter. The specification is25,000 ohms. Connect the meter leads to eachof the outside connections on the potentiometer,should read approximately 25,000 ohms. Next,take one of the test leads and connect to themiddle terminal, then turn the stem both direc-tions. The resistance value will change (vary)increasing and decreasing through its full rangeof 0-25,000 ohms and 25,000-0 ohms approxi-mately. If you do not get similar readings replacethe potentiometer.