Section 9 - Drive Units Drive Units - General Information M11 Page 9-5 Drive Units - General Information Fuel Pump and Compressor Drive The fuel pump and compressor drive housings are available in two designs, with and without hardware for mounting an air compressor. The fuel pump drive assembly has hardware for a hub or spider coupling. The compressor drive assembly has hardware for a splined sleeve coupling. The rebuild procedures are the same for both designs. The M11 Engine uses both metric and U.S. Customary capscrews. In some cases, capscrews in metric and U.S. Customary threads are almost identical in appearance.
Be sure to install the capscrews in the same location they were removed from. Hydraulic Pump Drive The hydraulic pump is gear driven from an idler gear in the front gear train. The drive gear and shaft are contained in the gear housing and rear support by two roller bearings. The bearings, gear and shaft receive lubrication from engine oil in the front gear train.