New Holland HW Series HW300, HW320, HW340 Speedrower Windrower Pdf Repair Service Manual (P. Nb. 86637556)

New Holland HW Series HW300, HW320, HW340 Speedrower Windrower PDF Repair Service Manual (Publication No. 86637556)

During a short haying window, machine uptime is just as important as cutting speed. The New Holland HW300, HW320 and HW340 Speedrower® Self-Propelled Windrowers were engineered for commercial hay producers who require high daily productivity, fast transport speeds and dependable cutting performance. With hydrostatic propulsion, high-capacity hydraulic systems and compatibility with large Discbine® and draper headers, the HW Series is built to harvest more acres while maintaining excellent forage quality.

Because these windrowers combine engine power, hydrostatic transmission, header hydraulics and electronic machine controls into one integrated platform, accurate workshop servicing is essential. This OEM Factory Repair Service Manual (Publication No. 86637556) provides dealership repair procedures covering diagnostics, testing, calibration and complete component overhaul for every major machine system, allowing technicians to restore original field performance while reducing costly seasonal downtime.

Built for High-Acreage Commercial Hay Production

Unlike earlier self-propelled windrowers, the HW300 Series was designed around higher horsepower, improved operator comfort and increased hydraulic capacity for larger cutting headers. The hydrostatic drive system allows smooth speed changes without interrupting crop flow, while the suspended cab and responsive controls help operators maintain consistent cutting quality across long working days. Whether mowing alfalfa, grass hay or mixed forage, these machines are designed to keep harvesting moving when weather conditions leave little room for delay.

Machine Information

Factory Workshop Coverage

Professional Workshop Procedures

• Calibrate hydrostatic transmission performance after pump or motor replacement.
• Inspect header flotation pressure to maintain uniform cutting height.
• Service rear steering axle components for precise field maneuverability.
• Repair hydraulic lift circuits and verify operating pressure under load.
• Inspect driveline couplings before installing seasonal harvesting headers.
• Diagnose electronic controller faults using factory wiring diagrams.
• Rebuild hydraulic pumps and control valves following OEM procedures.
• Inspect cooling system performance during extended harvesting operations.
• Apply factory torque specifications throughout structural repairs.
• Use exploded workshop illustrations for complete machine rebuilding.
• Verify hydrostatic drive response before returning the machine to service.
• Complete full operational testing with the installed harvesting header.

Manual Specifications

Frequently Asked Questions

Which Speedrower models are covered by this repair manual?

This OEM factory repair manual covers the New Holland HW300, HW320 and HW340 Self-Propelled Speedrower Windrowers.

Does the manual include hydrostatic transmission repairs?

Yes. It contains complete factory procedures for hydrostatic pumps, drive motors, transmission diagnostics, calibration and overhaul.

Are engine, hydraulics and header systems included?

Yes. The manual covers engine servicing, hydraulic systems, header interface components, steering systems and complete machine diagnostics.

Does the manual include electrical troubleshooting?

Yes. Factory wiring diagrams, electrical schematics, electronic control diagnostics and troubleshooting procedures are included.

Who should use this repair manual?

This workshop manual is intended for New Holland dealership technicians, commercial hay producers, agricultural equipment repair facilities and experienced mechanics servicing HW300, HW320 and HW340 Speedrower Windrowers.