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code 51+52

have 2 different erc050ghn48tq084 sn a908n08808f
first one has error code 51. no lift/drive plugged in good battery and found line contactor pops in/out every few seconds like the battery is dead. also tried swapping dash display with no changes

second truck has error code 52 and has all hydraulic functions but no drive. can anyone tell me the code meaning and have and advice on how to proceed. thanks in advance
  • Posted 18 Jun 2015 06:54
  • By smothers33
  • joined 18 Jun'15 - 11 messages
  • Illinois, United States
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Check the PTC that connects across the large terminals on the line contactor. If it is missing or not connected the capacitor in the controller will not stay charged. This will cause a code 51. Also make sure nothing is connected to the supply side of the line contactor like a scanner or radio. This will also cause a code 51. Code 52 is a motor encoder error either the drive motor or the pump motor.
  • Posted 19 Jun 2015 07:55
  • By BREWSKI
  • joined 10 Jan'12 - 1,699 messages
  • Nebraska, United States
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