Sweep System, Side Broom171Service Manual
SC6500|TroubleshootingProblem Cause CorrectionPoor sweepingperformanceBrushes are worn ordamagedCheck and replace the brushes as necessary.The broom height is not setcorrectly.Check and reset the broom height. Refer to the SideBroom Height Adjustment section.The brush gearmotor is notoperating correctly.Check the gearmotor current draw with no load (6amps nominal). Replace the gearmotor if necessary.A side broommotors will not run.K6 Side broom motorcontactor coil overload (errorcode 16 displayed)The nominal coil resistanceis 100 ohms.1. Check for a K6 coil wiring problem or short circuit(wire colors VIO and BRN/BLK).2. Check the coil resistance. If the resistance isbelow 80 ohms, replace the contactor.Side broom motor contactorcoil open (error code 36displayed)1. Check for open circuit in the K6 coil and wiring(wire colors VIO and BRN/BLK).2. Test for 36V at the K6 coil. If 0 Volts, check the A2control board assembly.K6 Side broom motorcontactor coil short toground (error code 37displayed)1. Disconnect the K6 coil wiring (wire colors VIOand BRN/BLK) and check to see if the codedisappears.− If the code disappears, replace the K6contactor.− If the code does reappear, test the wiring fora short back to the battery ground. Repair orreplace the defective wire.2. If the above test doesn’t remove the code,substitute a new A2 control board assembly.The side broomswill not extend orretract.Side broom actuatoroverload (error code 17displayed)• Normal current load is 1-2amps.• Max current load is 6amps.• Max current with no loadis 1.4 amps.1. Check for binding or frozen side broom lift linkageand excessive weight on the lifting arms.2. Check for a short circuit in the actuator motor andwiring. Repair or replace.To test the actuator, disconnect the motor plugand attach the actuator power cord adapter (p/n56407502) and perform an amp draw test. Comparereadings to the current load specifications.Side broom actuatormotor open (error code 38displayed)1. Use an ohmmeter to check for an open circuit inthe M4 side broom actuator and its wiring (wirecolors GRA/VIO and GRN/ORN). If defective,repair or replace.2. Test for 36V at side broom actuator. If 0 Volts,check the A2 control board assembly.
