Part of the New Holland Repair Manuals.
Fits the New Holland DuraSwath draper header family from 421HB through 440HB, five models in all, and this 519-page service manual PDF, OEM number 48106362, is the factory book behind every one of them. Hydraulic coverage runs from the reservoir, cooler and filter stack through reel vertical and fore-and-aft positioning, the cutter control circuit and feeder engagement, with schematics that trace each circuit valve by valve. Wiring diagrams map light harnesses and connectors, reel speed and position control, and the chopping and cutting control systems, while troubleshooting charts sit inside the chapters where the fault shows up. Set hold-down clearance at 0.25 mm (0.01 in), keep cleat height at 13 mm (0.5 in), and torque upper and lower cutterbar roller bearing mounting bolts to 50.2 N·m (37.0 lb ft). Nothing stalls a cut like one missing clearance figure. Bookmarks and a live text layer put you in the right section in seconds, so your windrow keeps moving.
What's Inside This New Holland DuraSwath 421HB, 425HB, 430HB, 436HB, 440HB Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 1-29 | Foreword - Important Notice Regarding Equipment Servicing, Safety Rules, Safety Rules - Personal Safety, Safety Rules - Ecology and the Environment |
| Hydraulic Systems | 30-167 | Reservoir, Cooler, And Filters, Reel Vertical Positioning System, Reel Fore-And-Aft Positioning System, Reel Control System, Cutter Control Circuit, Feeder Engagement System |
| Frames and Ballasting | 168-191 | Drawbar and Hitch Assembly, Endwise Transport System Frame |
| Wheels | 192-221 | Endwise Transport System Wheels, Gauge Wheels |
| Electrical Systems | 222-339 | Electrical System, Harnesses and Connectors, Light Harnesses, External Lighting, Reel Speed and Position Control, Feeding Control System, Chopping and Cutting Control Systems |
| Attachments/Headers | 340-509 | Cutting, Attachment/Header Reel, Attachment/Header Reel Control System, Attachment/Header Cutting Mechanism, Attachment/Header Frame, Cross-Auger, Belt Feeding |
| Platform, Cab, Bodywork, and Decals | 510-519 | Machine Shields and Guards |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Draper belt speed range | 0 – 232 m/min (0 – 760 ft/min) | p. 25 |
| Cleat height | 13 mm (0.5 in) | p. 25 |
| Upper cutterbar roller bearing mounting bolt torque | 50.2 N·m (37.0 lb ft) | p. 429 |
| Lower cutterbar roller bearing mounting bolt torque | 50.2 N·m (37.0 lb ft) | p. 429 |
| Standard guard cutting system hold-down clearance | 0.25 mm (0.01 in) | p. 433 |
| Standard guard cutting system hold-down nut torque | 50 N·m (37 lb ft) | p. 432 |
| Schumacher knife guard mounting bolt torque | 16 N·m (142 lb in) | p. 441 |
| Standard guard system knife guard mounting nut torque | 16 N·m (142 lb in) | p. 443 |
| Knife section hardware torque (Schumacher cutting system) | 10 N·m | p. 449 |
| Knife section hardware torque (Standard cutting system) | 8 – 11 N·m | p. 451 |
| Draper belt clearance | 6 mm (1/4 in) | p. 500 |
| Draper belt splice length (close to factory splice) | 95 mm (3.75 in) | p. 501 |
New Holland DuraSwath 421HB, 425HB, 430HB, 436HB, 440HB Common Problems This Manual Covers
New Holland 421HB draper belt stops, jerks, or stalls under heavy crop load
Check the belt feeding troubleshooting chart for draper slipping and draper not turning conditions. Verify the draper and reel circuit relief valve RLF-03 is holding 23442 kPa (3400 psi) per the spec on page 49. Inspect roller bearings for seizure and clear packed debris from the deck channels.
Manual Section: Belt FeedingDraper tracks off-center or wanders on the rollers during cutting
Inspect the splice for a square, even cut. Recut it to 95 mm (3.75 in) when working close to the factory splice, following the procedure on page 501, and drill the connector bar holes 25 mm (1 in) from the cut end. Then set draper belt clearance to 6 mm (1/4 in) and align the idler roller.
Manual Section: Belt Feeding p. 501Crop plugs at the windrow opening and material builds up instead of feeding
Clean packed material off the rear shields, cross braces, and roller ends before anything else. Verify belt speed is in the 0 to 232 m/min (0 to 760 ft/min) range listed on page 25 and raise it for tall, heavy crop. Check cleat height at 13 mm (0.5 in) and replace belts worn below that.
Manual Section: Belt Feeding p. 25Ragged cut, knife chatter, and missed crop with rapid wear on sections and guards
Measure hold-down clearance with a feeler gage and set it to 0.25 mm (0.01 in), then torque the hold-down nuts to 50 N·m (37 lb ft) per page 432 while holding the gage in place. Replace cracked guards, torquing standard system mounting nuts to 16 N·m (142 lb in) as shown on page 443.
Manual Section: Attachment/Header Cutting Mechanism p. 433Hydraulics run hot, start sluggish, or operate jerky in cold morning conditions
Verify both hydraulic couplers are fully seated and locked before blaming the pump. Work through the hydraulic troubleshooting chart for case drain restriction and oil viscosity. Test the knife pressure relief valve RLF-02 against the 23442 kPa (3400 psi) setting on page 48 and let oil warm before full header speed.
Manual Section: Hydraulic Systems TroubleshootingReel turns slowly, moves erratically, or sits out of level across the header
Check the reel troubleshooting chart for slow operation and erratic movement. Inspect the reel drive motor case drain line for restriction, then confirm the draper and reel circuit relief valve RLF-03 holds 23442 kPa (3400 psi) per page 49. Level both reel ends before returning to the field.
Manual Section: Attachment/Header ReelFrequently Asked Questions
What is the nominal torque for an M10 Class 8.8 bolt on the DuraSwath 421HB-440HB?
Torque a metric M10 Class 8.8 bolt with a Class 8 nut to 57 N·m (42 lb ft). p. 17
How often is the draper and reel oil filter replaced on a DuraSwath 421HB-440HB?
Replace the hydraulic oil filter after the first 50 hours of operation, then every 250 hours or seasonally. p. 64
What gap sits between the pulse wheel and knife speed sensor on a DuraSwath 421HB-440HB?
Position the header knife speed sensor so a gap of 1.56 mm (1/16 in) exists between the pulse wheel and the sensor head. p. 334
What torque does the knife section hardware take on a DuraSwath 421HB-440HB?
On the standard cutting system, torque the knife section hardware to 8 – 11 N·m (71 – 97 lb in). p. 451
What is the correct chain deflection measurement for the reel drive chain?
Adjust the reel drive chain to a deflection of 6.4 – 9.5 mm (1/4 – 3/8 in) at the center of the chain span. p. 410
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