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

Crown PC 4500:
Unit Bucks under light acceleration

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
Discussion started by BigForker52
Alaska, United States

Located in the north north

Post a Reply Report this post

Showing items 1 - 1 of 1 results.

Sort messages by:

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
Reply by BigForker52
Alaska, United States

Located in the north north

Post a Reply Report this post

Post your Reply

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

Having trouble using the Discussion Forums? Contact us for help.