1983–1992 New Holland Tractor TW25 6-Cylinder Agricultural Tractor Parts Catalog (P/N 66052462d)

• Covers 1983–1992 New Holland TW5, TW15, TW25, TW35, and 8530–8830 series agricultural tractors, including variants with FWD or APL-365 heavy-duty axle configurations.
• Official 1,102-page OEM parts publication (P/N 66052462d) featuring part numbers and revision dates for model-specific components.
• Contains 47 detailed exploded-view diagrams illustrating complex assemblies like the front axle, steering motor, and transmission handbrake systems.
• Serves as the primary reference for identifying components across multiple configurations, documenting assembly variations such as 6-lug to 8-lug front wheel conversions.

Assembly Structure and Documentation

This catalog provides a comprehensive parts list for New Holland TW-series 6-cylinder agricultural tractors. It segments components by system. You will find detailed breakdowns ranging from front-end ballast and wheel assemblies to the transmission handbrake lever and steering column architecture. The documentation defines specific part numbers for major heavy-duty front axle variants, including the APL-345, APL-350, and APL-365 systems.

Each system section presents an exploded-view illustration followed by an itemized list. These lists clearly identify the reference number, part number, quantity, and specific fitment criteria. The text clarifies component usage for L/Cab and W/Cab models. It also highlights distinct regional hardware requirements for NH-E and NHNA specifications.

Component Specification Previews

Accurate parts documentation is essential for identifying the correct replacement hardware on vintage New Holland machinery. The catalog details numerous critical hardware specifications. For instance, you can verify the exact 5/8"-18 x 2-1/2" bolts used for front wheel mounting on specific configurations. Front-end weights are listed in 40 kg or 100 lb units, depending on the bracket type and model year.

Steering assembly data includes precise O-ring dimensions, such as .468" ID x .078" thickness. The publication also lists multiple shim thicknesses ranging from 0.01425 to 0.028 inches for exact component alignment. Please note that all technical specifications require verification against the actual working environment. Proper safety protocols and the original factory documentation remain the authoritative source before undertaking any heavy machinery maintenance or parts replacement.