New Holland HW300, HW320, HW340 Speedrower Self-propelled Windrower Pdf Repair Service Manual (p. Nb. 86589299)

New Holland HW300, HW320, HW340 Speedrower Self-Propelled Windrower PDF Repair Service Manual (Publication No. 86589299)

The success of a hay harvest often depends on completing cutting operations within a narrow weather window. The New Holland HW300, HW320 and HW340 Speedrower® Self-Propelled Windrowers were designed to maximize productivity by combining powerful hydrostatic propulsion, responsive hydraulic controls and compatibility with high-capacity Discbine® and draper headers. These machines allow operators to maintain uniform cutting height, create consistent windrows and harvest more acres per day with reduced crop losses.

Whether operating in dense alfalfa, grass hay or mixed forage, every major component—from the propulsion system to the header interface—must perform reliably under continuous field loads. This OEM Factory Repair Service Manual (Publication No. 86589299) provides factory-approved repair procedures for troubleshooting, testing, calibration and complete machine overhaul, making it an essential workshop reference for professional technicians and fleet maintenance teams.

Purpose-Built for Commercial Forage Harvesting

The HW300 Series combines a reinforced chassis with a hydrostatic transmission and advanced hydraulic header controls, enabling smooth operation across rough terrain while maintaining precise cutting performance. The self-propelled design eliminates the limitations of pull-type machines, improves maneuverability in irregular fields and reduces time lost during transport between jobs. Depending on the installed header, these windrowers can efficiently harvest alfalfa, clover, grass, forage crops and hay destined for baling or silage production.

Machine Information

What You'll Learn from This Factory Manual

• Diagnose hydrostatic drive performance using factory pressure testing procedures.
• Calibrate header flotation to achieve consistent cutting height across uneven terrain.
• Inspect and rebuild hydraulic pumps, control valves and steering circuits.
• Service planetary final drives and wheel drive components.
• Repair header lift systems and hydraulic cylinders following OEM specifications.
• Identify electrical faults using complete wiring diagrams and diagnostic charts.
• Inspect driveline couplings and header engagement mechanisms.
• Adjust steering linkage and rear axle components for precise machine control.
• Perform seasonal inspections to reduce unexpected downtime during harvest.
• Use factory torque values and service limits during complete machine rebuilding.
• Follow exploded component illustrations for accurate disassembly and assembly.
• Verify machine operation through complete post-repair functional testing.

Factory Workshop Coverage

Manual Specifications

Frequently Asked Questions

Which Speedrower models are covered by this manual?

This OEM factory repair manual covers the New Holland HW300, HW320 and HW340 Speedrower Self-Propelled Windrowers (Publication No. 86589299).

Does the manual include hydrostatic transmission diagnostics?

Yes. It provides complete procedures for testing, repairing and rebuilding hydrostatic pumps, drive motors, transmission components and planetary final drives.

Are header hydraulic systems included?

Yes. The manual covers header lift mechanisms, flotation adjustments, hydraulic circuits, attachment interfaces and pressure testing procedures.

Does the manual contain electrical wiring diagrams?

Yes. It includes OEM electrical schematics, wiring diagrams, sensor diagnostics and troubleshooting procedures.

Who is this workshop manual intended for?

This manual is ideal for New Holland dealership technicians, agricultural equipment repair shops, commercial hay producers, fleet maintenance departments and experienced mechanics servicing HW Series Speedrowers.