1991-1995 Ford 5640, 6640, 7740, 7840, 8240, 8340 & New Holland S90, S100 Tractor Service Manual (P/N SE 4840-8)

• Covers the 1991–1995 Ford 5640, 6640, 7740, 7840, 8240, 8340 and New Holland S90, S100 tractor range, including both naturally aspirated and turbocharged engine configurations.
• Official New Holland publication P/N SE 4840-8, dated January 1992.
• Comprehensive 1,492-page factory reference documenting engine overhaul, chassis maintenance, electrical diagnostics, and fuel-injection specifications.
• Contains 72 technical diagrams and 5 detailed torque and capacity reference tables for the 4-cylinder and 6-cylinder variants.
• Details transmission calibration and hydraulic system diagnostics unique to the 16x16 and 12x12 gearsets.

Engine and Fuel System Documentation

This service manual provides extensive information on the overhaul and pressure testing of direct injection diesel engines. Spanning 12 parts, the documentation covers cylinder head assemblies, crankshaft-driven dynamic balancers, and independent power take-off systems. Separate chapters address transmission variants, including the 16x16 'Quad Mod' and 8x2 dual power assemblies, alongside hydrostatic steering and electronic draft control components.

Fuel system sections focus heavily on DPS distributor-type injection pumps. They highlight precise priming procedures and throttle linkage adjustments for both hand and foot controls. You will also find a dedicated walkthrough of the dry and wet air cleaner systems, outlining specific maintenance requirements based on filtration types and operating dust levels.

Specification Highlights

Technical data is clearly segmented by component to deliver accurate clearance and torque values across all subsystems. Valve lash settings for the aforementioned tractor range are strictly specified at 0.014–0.018 inches for intake and 0.017–0.021 inches for exhaust. Intake valve seat width is documented at 0.078–0.098 inches in the specification tables, while the 6-cylinder engine oil capacity with filter is listed at 22.0 liters.

Working on heavy agricultural machinery involves substantial physical hazards, particularly around high-pressure fluid systems and drivetrain components. Always verify that system pressure is fully relieved before loosening any hydraulic lines, and strictly adhere to these factory-specified torque values during reassembly to ensure structural integrity and safe operation in the field.