Nilfisk-Advance 56315036(28D) Service Manual

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Nilfisk-Advance 56315036(28D) Service Manual Manual pdf 50 page image

48 - FORM NO. 56043103 - Warrior ™ ST, Warrior ™ AXP / BA 755 seriesWHEEL DRIVE SYSTEM(5K) POTENTIOMETER (R1) TESTING AND REMOVALWARNING!Disconnect batteries at the battery pack disconnect before servicing.Testing the 5KDirectional/Throttle Potentiometer R1Note: The potentiometer (pot) doesn’t have to be removed from its housing mount to test.1 See Figure 7. Remove the front Drive Paddle Cover (G) from the Rear Housing (H) held together with (4) (I) Screws. Note the cover will have the speed limitingPot (R2) mounted to it, observe the (3) wires and separate them to complete the removal of the cover.2 See Figure 8. Observe the 3 wires connected to the R1 pot and disconnect. Note the proper wire numbers and/or colors and their terminal connections forre-assembly.3 Test the Pot (R1) using an ohmmeter, the potentiometer specification is 5K Ohms. Connect the meter leads to each of the outside connections (3 high & 1 low,shown in Figure 8) on the pot, it should read approximately 5,000 ohms (range 4,500-5,500 ohms).4 Next, take the 3 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 bothdirections. The readings should be approximately half the total resistance (2,500 ohms) towards 5,000 ohms and 2,500 ohms towards 0 ohms. Example “A”:total resistance of pot 4,840 ohms (3 high/1 low) test connections. Example “B”: test middle connection (2 wiper) and outside rear (1 low) Fwd reading 2,420ohms to 4,700 ohms, Rev 2,420 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 thePotentiometer (R1).FIGURE 7R1 Potentiometer Removal6 See Figure 9. Loosen the potshaft anchor nut and unthreadit to the end of the shaft.7 Back out the Screw (J) fromthe pot Fork (K).8 Maneuver the pot (R1) out fromits mounting bracket hole andseparate the Fork (K) from theshaft end.9 Finish unthreading the anchornut from the end of the pot andthen remove the pot completelyfrom the handle mount.10 To reinstall a potentiometer seethe adjustment section belowin this manual section.(5K) POTENTIOMETER (R1) INSTALLATION ANDADJUSTMENTWARNING!The adjustment of the potentiometer is to set the drive paddle for aneutral drive motor operation. If the potentiometer is not adjustedproperly, the machine will not move in either FWD or REV with normaloperator input. Also the Led display panel would indicate a speedcontrol system fault 03.1 See Figure 9. Install lock washer (on pot side), pot and anchor nut to the handlemount bracket as shown. NOTE: Do not completely tighten the anchor nut at thistime.2 Using an ohmmeter connect leads to the middle terminal (2 wiper) and the (1 lowpot) outside terminal. Then preset, turn the shaft to approximately 2,500 ohms.3 Install the Fork (K) onto the pot shaft, and then tighten the (J) Screw.4 Then without turning the pot shaft thread the anchor nut just enough to seat thepot to its mounting bracket.