Caterpillar Testing and Adjusting Power Shift Transmissions Service Manual For all Cat Machines with powershifts that were built pre to 1970. Very nice Manual with tons of information. Covers CAT 920-930 Wheel Loaders, CAT Track-Loader 941, 951B.  CAT Haul Trucks 769, 769B. CAT Scraper 613 up to 666. CAT Pipe Laying tractors 571-572. CAT  Motor Graders 12MG, 14MG, 16MG.  Cat Track Type Tractor D4D,D5,D6C,D7E,D7F,D8H,D9E,D9G.