John deere code hcu 55. HCU Unswitched Supply Voltage Low. Rear Hitch Calibration Fault/Engine Speed Low. Hitch may not operate as normally expected. Initially, the owner mentioned it wouldn't move, but he drove it to the shop today, about 4 miles, and said the clutch was not fully disengaged. Sep 9, 2009 · OMRE299297 Hitch Control Unit (HCU) Diagnostic Trouble Codes Complete Diagnosis & Tests Technical Manual with electrical wiring diagrams for John Deere 2WD or MFWD Tractors 8120, 8220, 8320, 8420 & 8520, with all the shop information to maintain, diagnose, and service like professional mechanics. It's happened before but is intermittent. Planting corn with a 2 point with lift assist. Says hitch may not operate normally. pdf), Text File (. John Deere fault codes - Free download as PDF File (. gflqzw kqyke cvot qys ybohd rbqv iqmkkv dnagj hlohu lvg