This comprehensive workshop service repair manual covers the John Deere 2140 and 3640 tractors. It provides detailed instructions and technical specifications for servicing and repairing all major components of these tractors, including the 3920 cc 4-cylinder and 5883 cc 6-cylinder engines. The manual includes sections covering general information, safety precautions, lubrication and maintenance, tractor separation, engine system, radiator system, fuel system, speed control linkage, air cleaner system, electrical system, wiring harness, controls and instruments, lighting system, starting motor, alternator system, power train system, clutch operating, engine clutches, creeper transmission, shift linkage, collar shift-differential, final drive, PTO system, front wheel drive, steering system, brake system, hydraulic system, rockshaft-hose couplers, remote cylinder, special tools, axle and belt pulley, front and rear wheel, operator's cab, air conditioning, heating-ventilation, and wiring diagrams.