Cummins Operation and Maintenance Manual for H, HS, HR, HRS, NH, NHS and NHRS series diesel engines dated September, 1953. An 86 page manual divided into 4 sections as follows: Principles of Operation, Operating Instructions, Maintenance and Engine Unit Replacement. This manual has a very detailed index and hundreds of photos. There is also a very good descriptive section on single disk injector pumps. Professionally restored and reprinted.
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