My son has a 2010 JLG E400AJPN that he just got. The drive gets an error 4615 speed sensor - invalid reading. Will not move forward or backwards, just clicks then gets error. The speed sensors look new but the part number on them does not match part number in parts manual for his model. Serial number is 0300141715 says it needs pn 3990105 but it has part number KPA13134. The speed sensors and motors look new on both sides. I unplugged left sensor and tried moving and got error 4611 and no movement. I then unplugged right sensor and got 4610 and no movement. Anyone have any ideas how to trouble shoot this problem?
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