Onan engine service manual 29 page booklet from Case/Ingersoll covering servicing the BF,B43M,B48M, and CCKA Onan engines.Includes tune-up and rebuild specs and troubleshooting. 9-51393$9.25 644 and 646 Operator's Manual 55 page Operators manual for 644 and 646 models of Case garden tractor loader. Details include tune-up specs, operating instuctions, preventative maintenance,capacities, specifications and travel control adjustments. 9-7091$22.25 648 Operators Manual 71 page Operators manual for 648 models. Lists operating instructions, preventative maintenance,capacities,lubrication,travel control adjustments and tune up specs. 9-8171$11.99 Parts Manual for 648 Models 102 page parts manual for 648 case Garden Tractor loader or loader/backhoe models. All serial numbers. Contains exploded views and part numbers for all tractor components. 8-1422$21.00 Parts Manual for 644 and 646 Loaders (Early 1972) 111 Page parts manual for 644 models prior to serial number 9662906 and 646 models prior to serial number 9663323. Contains exploded views of all tractor components and parts numbers for all parts. A1259$23.00 Parts manual for 644 and 646 Models ( Late 1972 to 1974) Parts Manual for 644 models serial number 9662906 thru 9698283. 646 models serial number 9663323 thru 9698982. Contains exploded views of all tractor components and parts numbers for all parts. A1281$22.00 Parts Manual for 644,646 and 648 ( Late 1974 to 1980) 130 page parts manual for 644 and 646 models after serial numbers 9698284 for 644. After 9698983 for 646. Loaded with pictures,exploded views and part numbers for all tractor components. C1302$35.99