Part of the New Holland Repair Manuals.
Reel hydraulics, feeder engagement, cutter control, and head and header drive: this 274-page New Holland DuraSwath service manual PDF, OEM 47528908, walks each of those circuits end to end across all four HB-series draper header models, 425HB through 440HB. Schematic frames map every hydraulic circuit from the main manifold outward, and the hydraulic and electrical sections together fill well over half the book. Harness and connector diagrams trace reel speed, feeding, and chopping control wiring down to the pin, while exploded views break the cutting mechanism and belt feed apart for clean reassembly. Check knife stroke against the 8.51 cm (3.35 in) factory figure before you blame the drive, then pull M24 Class 10.9 plated hardware to 1016 N·m. Misdiagnose one valve and you buy the manifold twice. Bookmarked and text-searchable, the PDF rides in the cab with you, so the spec is wherever the header is cutting.
What's Inside This New Holland DuraSwath 425HB, DuraSwath 430HB, DuraSwath 436HB, DuraSwath 440HB Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 1-28 | Foreword, Safety Rules, General Specification |
| Hydraulic Systems | 29-120 | Component Localisation, Hydraulic Schematic Frames, Main Manifold Overview |
| Electrical Systems | 121-198 | Electrical System, Harnesses and Connectors, External Lighting, Reel Speed and Position Control, Feeding Control System, Chopping and Cutting Control Systems |
| Attachments/Headers | 199-274 | Attachment/Header Reel, Attachment/Header Cutting Mechanism, Belt Feeding, Foreword - Important Notice Regarding Equipment Servicing, Safety Rules |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Metric non-flanged hardware M4 Class 8.8 bolt and class 8 nut Unplated | 2.2 N·m | p. 14 |
| Metric non-flanged hardware M24 Class 10.9 bolt and class 10 nut Plated with ZnCr | 1016 N·m | p. 14 |
| Raptor™ draper belts | 1066 mm (42 in) | p. 23 |
| Draper belt speed range | 0 - 232 m/min (0 - 760 ft/min) | p. 23 |
| Knife stroke | 8.51 cm (3.35 in) | p. 23 |
| Reel drive motor displacement | 260.0 cm³ (15.9 in³) | p. 24 |
| Torque knife hardware | 10 N·m (89 lb in) | p. 228 |
| Torque all knife bolts | 8 - 11 N·m (71 - 97 lb in) | p. 234 |
| Optimum clearance between upper and lower ledger surfaces of sickle guard | 3.80 - 4.20 mm (0.15 - 0.17 in) | p. 225 |
| Sickle guard replacement clearance limit | 5.40 mm (0.21 in) | p. 225 |
| Torque sickle guard mounting bolts for cutterbar roller bearing | 50.2 N·m (37.0 lb ft) | p. 224 |
| Torque for knife bolts | 8 - 11 N·m (71 - 97 lb in) | p. 241 |
New Holland DuraSwath 425HB, DuraSwath 430HB, DuraSwath 436HB, DuraSwath 440HB Common Problems This Manual Covers
New Holland DuraSwath draper belt wanders off track and wears at the edges under load
Inspect the V-guides and idler roller for wear and packed crop debris, and clean both drum ends. Check draper deck clearance against the 6 mm (1/4 in) spec on page 261. If you loosen the idler plate to realign the belt, torque the idler plate bolts to 87 N·m (64 lb ft) per page 264.
Manual Section: Belt feeding p. 264Hydraulic reel runs slow, loses speed in heavy crop, or stops intermittently
Check couplers for full engagement and inspect hoses for kinks or internal collapse. Verify system pressure against the 20684 kPa relief valve setting on page 57. If the oil runs hot, work through the hydraulic troubleshooting steps. Steady pressure with a slow reel points to a worn reel drive motor (260.0 cm³ displacement, page 24).
Manual Section: Hydraulic SystemsCutterbar leaves strips of standing crop, ragged cutting and plugged sections in down grain
Replace dull or cracked knife sections and torque knife bolts to 8 - 11 N·m (71 - 97 lb in), page 235. Measure sickle guard ledger clearance; optimum is 3.80 - 4.20 mm, and guards past the 5.40 mm limit on page 225 need replacement. Set hold-down clearance to 0.25 mm per page 236 before the next pass.
Manual Section: Attachment/Header cutting mechanism p. 225Wobble box area knocks and vibrates at full throttle, noise grows through the season
Check the knife drive hold-down bolts and torque any loose ones to 163 N·m (120 lb ft), page 250. Torque the knife head cross bolt to 72 N·m (53 lb ft) on New Holland cutting systems, 99 N·m (73 lb ft) on Schumacher. Run the pressure test on page 107; single-knife drive pressure should hold 6900 - 10350 kPa.
Manual Section: Cutter control circuit p. 250Crop bunches at the center deck or feeds unevenly across the belts in tough conditions
Adjust belt speed to match the crop; the drapers run 0 - 232 m/min (0 - 760 ft/min), spec on page 21. Check draper deck clearance and set it to 6 mm (1/4 in) per page 261. Clean packed stems from under the decks and reset belt tension evenly on both sides before heading back to the field.
Manual Section: Belt feeding p. 261Frequently Asked Questions
What are the M10 non-flanged torque specs on a New Holland DuraSwath 425HB, 430HB, 436HB, 440HB?
For M10 metric non-flanged hardware, the torque specifications depend on the bolt class and plating. For a Class 8.8 bolt and class 8 nut, the torque is 37 N·m (27 lb ft) for unplated and 49 N·m (36 lb ft) for plated with ZnCr. For a Class 10.9 bolt and class 10 nut, the torque is 52 N·m (38 lb ft) for unplated and 70 N·m (51 lb ft) for plated with ZnCr. p. 14
What is the recommended relief valve setting for the New Holland DuraSwath 425HB, 430HB, 436HB, 440HB hydraulic system?
The header's hydraulic system utilizes one relief valve, which should be set at 20684 kPa (3000 psi). If the hydraulic system is bypassing oil all of the time, adjust the relief valve as required. p. 57
How do I adjust the knife-to-guard clearance for the standard New Holland cutting system?
Insert a 0.25 mm (0.01 in) feeler gage between the hold-down and the knife, then tip the hold-down forward while turning the adjustment bolt until it lightly touches the bar underneath. Torque the nuts to 50 N·m (37 lb ft) while maintaining the feeler gage in place. p. 236
What is the correct torque for the knife head cross bolt on New Holland cutting systems?
The knife head cross bolt should be torqued to 72 N·m (53 lb ft) for New Holland cutting systems. For Schumacher cutting systems, it should be torqued to 99 N·m (73 lb ft). p. 251
What is the reel speed sensor to pulse wheel clearance on a New Holland DuraSwath 425HB, 430HB, 436HB, 440HB?
The header reel speed sensor should be positioned so that a gap of 1.56 mm (1/16 in) exists between the pulse wheel and the sensor head. p. 181
How quickly can I access this New Holland DuraSwath 425HB manual after buying?
A single searchable PDF file of 274 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Is this New Holland DuraSwath 425HB manual print-friendly?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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