Part of the New Holland Repair Manuals.
This 826-page New Holland HW300, HW320, HW340 Speedrower Repair Manual (OEM #86589300) covers the self-propelled windrower from front tires to header drive. Inside you get wiring diagrams for the electronic, air-conditioning, lighting, engine, and charging systems, hydraulic schematics for header lift, tilt, and flotation trim, and a full hydrostatic transmission section covering the pump, relief valve, charge pressure, and servo cylinder. You'll also find planetary final drive and brake teardown steps, plus a full troubleshooting and DTC section for chasing engine and electrical faults. Torque the planetary final drive cap screws to 224 N·m (165 ft lbs) and the special flange nuts to 244 N·m (180 ft lbs), fill the hydraulic reservoir with 134D fluid, and follow the exact start-up sequence before running the pump or motor again. Quit flipping through forum threads for numbers that don't match your machine. Bookmarked by section so you can jump straight to the system you're working on, right from your phone in the shop.
What's Inside This New Holland HW300, HW320, HW340 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Electrical Systems | 5-212 | Windrower Electronic System, Air-Conditioning Electrical System, Lighting Electrical Systems, Engine Electrical Systems, Charging Electrical System |
| Secton 2 - Hydraulic Systems | 213-374 | HW300/320 Header Drive, HW340 Header Drive, Header Lift, Hydraulic Header Tilt and Flotation Trim |
| Hydrostatic System | 375-454 | Hydrostatic Transmission, Hydrostatic Pump, Relief Valve, Charge Pressure, Servo Cylinder, Neutral Standing Adjustment |
| Final Drives | 455-476 | Coupler, Spindle, Bearings, Ring Gear, Sun Gear, Planetary Carrier |
| Brake System | 477-502 | Parking Brake, Brake Disc, Brake Actuator, Brake Housing, Pintle Arm, Neutral Locking Disc |
| Engine | 503-764 | Cylinder Head Assembly, Camshaft Assembly, Crankshaft Assembly, Pistons, Fuel System, Turbocharger |
| Air Conditioning | 765-826 | Introduction |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic fluid type | 134D hydraulic fluid | p. 255 |
| Planetary final drive cap screws torque | 224 N·m (165 ft lbs) | p. 459 |
| Special flange nuts torque | 244 N·m (180 ft lbs) | p. 459 |
| Thermostat Opening Temperature | 81°C (178°F) | p. 611 |
| Thermostat Fully Open | 94°C (201°F) | p. 611 |
| EIC-switched power fuse | 10A | p. 10 |
| Alternator (Bosch) output | 95-amp | p. 109 |
| Hydrostatic pump relief setting | 345 bar (5000 PSI) | p. 444 |
| Cylinder bore compression @ 200 RPM | 25.5 bar (370 PSI) | p. 505 |
New Holland HW300, HW320, HW340 Common Problems This Manual Covers
New Holland HW340 starts and stops frequently or experiences complete engine shutdown under load p. 692
Replace the fuel filter if the machine has exceeded the 600 Hours service interval noted on page 692. Disconnect the fuel solenoid wire from the injection pump to prevent starting during service. Bleed the lines to restore proper fuel flow.
Manual Section: EngineHydrostatic transmission slipping or sudden loss of drive power in high humidity conditions p. 444
Test the hydrostatic pump output pressure at the test ports. Verify the hydrostatic pump relief setting reaches exactly 345 bar (5000 PSI) as specified on page 444. Inspect internal seals for contamination and refill the reservoir using clean 134D hydraulic fluid.
Manual Section: Hydrostatic SystemE01 error code active with engine temperature gauge spiking into the red zone p. 611
Check the cooling system for restrictions and verify the coolant level. Remove and test the engine thermostat. Confirm the thermostat opening temperature is exactly 81°C (178°F) as shown on page 611. Replace the unit if it fails to open fully.
Manual Section: Troubleshooting: Engine (Overheats, Knocks, Low Oil Pressure, Excessive Oil Consumption)Heavy vibration and clunking noises from the wheel hubs during high speed operation p. 459
Inspect the planetary final drive components for excessive wear or damaged bearings. Reassemble the hub and secure the housing using new hardware. Tighten the planetary final drive cap screws to 224 N·m (165 ft lbs) torque as detailed on page 459.
Manual Section: Final DrivesFrequently Asked Questions
What are the torque specifications for the planetary gear drive on HW300, HW320, and HW340 models?
For the planetary final drive, secure it with eight 5/8" x 1-3/4" cap screws and flat washers, tightening to 224 N·m (165 ft lbs) torque. The locknut for the planetary gear drive should be tightened to a rolling torque of 4.5 - 5.5 N·m (3.3 - 4.0 ft lbs). The ring gear bolts should be tightened to 70.5 - 81.3 N·m (52 - 60 ft lbs) torque.
How do I adjust the steering sensitivity on a New Holland HW340 swather?
To adjust the steering sensitivity, move the FNR lever to neutral. Loosen the shift joint lock nuts and back off the shift joint adjusting nuts. Then, proceed to neutral and steering adjustments later in this section. The measurement must be made with the spool valve, 7, centered.
What are the replacement specifications for the fuel filter?
The fuel filter replacement specification for HW300, HW320, and HW340 models is a Single Disposable Element. The recommended change interval is every 600 Hours.
What is the recommended engine oil capacity for a 4-cylinder engine?
The engine oil capacity for a 4-cylinder engine (less oil filter) is 11.6 Litres (16.00 U.S. Qts). With the oil filter, the capacity is 13.6 Litres (17.0 U.S. Qts).
How quickly can I access this New Holland HW300, HW320, HW340, Speedrower?
Immediate download of the complete 826-page Repair Manual. This book is a scanned reproduction of the printed factory manual, so its pages are images, so the text is not selectable or searchable. Access it on any device, from a laptop at your desk to a phone in the field.
Are there any print restrictions on this New Holland HW300, HW320, HW340?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Are there hydraulic schematics in this New Holland HW300, HW320, HW340?
Yes, this New Holland HW300, HW320, HW340, Speedrower SELF-PROPELLED Windrower Repair Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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