Unit Bucks under light acceleration - Maintenance & Troubleshooting discussion in Forkliftaction's forums

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Unit Bucks under light acceleration

Crown PC 4500

fc4525--50 ac drive motor, regular pump and steer motor. unit bucks forward and reverse when under light acceleration with or without a load
i have replaced the access 3 traction controler
accelerator pot and switch
brake switches
encoder in drive motor
checked wiring between encoder connector and main connector on traction controller--pass
battery doesn't lose more than 4 volts while driving
battery is out of unit and still has same issue
had code 314 very rarely, hasn't come back on since encoder replacement

Posted 7 Dec 2022 05:05
By BigForker52
joined 7 Dec'22 - 5 messages
Alaska, United States

Located in the north north

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have an update for this, I have replaced the traction motor now and still have the problem present. Here is some new data
the ECR supply voltage is 11.3v
the ECR channel A voltage and B voltage are all over the place ranging from 1-10volts
but here is the weird thing and what I think it means
when the unit occasionally sits and I measure voltage coming of the ECR channel A & B wires (2 different volt meters) i get 10v on both wires, I now believe the controller is bad. (bad grounding internally??)
Anyone know of any tests for the controller that may be performed to confirm some suspensions

Posted 10 Mar 2023 12:38
By BigForker52
joined 7 Dec'22 - 5 messages
Alaska, United States

Located in the north north

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