"Supplement GMC Maintenance Manual models HDCR-640 and 650, and HCW-620" This is the original manual used by GMC mechanics to repair trucks. It covers the differences between the models listed and other GMC trucks of a similar size. The book primarily covers step-by-step illustrated repair instructions for the dual rear axles and complete wiring diagram of the HCDR trucks as well as the rear springs of the HCW-620 model. For other repairs, this book will refer you to the 1950-1953 GMC 520-970 repair manual. See my other items for that book. This manual covers the 1950 GMC HDCR-640 and HCDR-650, which are smaller diesel highway tractors, as well as HCW-620 series, a "middle-weight" tandem axle truck. It measures 8.5" x 11" and has 40 pages. Buy now to own the best manual for your truck.
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