Part of the New Holland Repair Manuals.
A draper belt that crawls in heavy canola and a knife that chatters at the ends usually trace back to two numbers nobody keeps in their head: the relief valve setting and the hold-down clip clearance. Both are here, with the drawings that show where to put the gauge.
Publication 84157369 covers the New Holland 18HB, 21HB, 25HB, 30HB and 36HB draper headers across 152 PDF pages. Hydraulics runs the draper drive, knife drive, reel drive and reel lift, with schematics and pressure tests. Attachments handles cutting systems, guards, draper decks and drive rollers. Electrical covers lights, remote speed control and the sickle drive speed sensor, and the Decals section lists decal part numbers.
Guessing has a price: the wrong knifehead kit, a second teardown of the cutterbar, a motor ruined for want of a torque figure. Look it up, get the torque and shim figures right the first time, and get back in the field while the crop stands.
What's Inside This New Holland 18HB–36HB Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 11-30 | Precautionary Statements, Safety, Operating and Maintenance Safety, Hydraulic Safety, Welding Safety, Before Transporting, Transport Safety, Transporting Checks |
| Specifications | 31-34 | |
| Hydraulics - Draper Drive | 35-54 | Draper Drive |
| Hydraulics - Windrower Headers | 55-56 | |
| Hydraulics - Schematics and Troubleshooting | 57-62 | |
| Hydraulics - Pumps, Motors and Flow Dividers | 63-84 | Hydraulic Motors, Flow Dividers, Hydraulic Manifold Block |
| Hydraulics - Reel Lift | 85-98 | Reel Lift, Hydraulic Cylinders |
| Electrical - Windrower Headers | 99-106 | Electrical System, Lights, Remote Speed Control, Sickle Drive Speed Sensor, Automatic Reel Speed Control |
| Attachments - Knife Drive | 107-126 | Knife Drive, Cutting Systems, Guards, Connector Bar |
| Attachments - Draper Decks | 127-136 | Draper Decks, Drive Rollers |
| Decals | 137-144 | Safety Decals, Decal Locations, Decal Part Numbers, Warning Signs |
| Complete Contents | 145-152 | General Information, Precautionary Statements, Safety, Transporting, Specifications, Hydraulics, Draper Drive, Reel Lift, Windrower Headers, Schematics, Troubleshooting, Pumps, Motors, Flow Dividers, Electrical, Drivelines, Knife Drive, Feeding Components |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Knife head cross bolt torque | 55.5 N⋅m (41 lb ft) | p. 118 |
| Knife head bolts torque (Schumacher) | 13.5 N⋅m (9.96 lb ft) | p. 119 |
| Knife hold-down clip clearance at X | 0.125 - 0.64 mm (0.005 - 0.025 in) | p. 115 |
| Knife hold-down clip clearance at Y | less than 0.50 mm (0.020 in) | p. 115 |
| Fixed idler plate retaining bolt torque | 87 N⋅m (64 lb ft) | p. 135 |
| Transport tire pressure | 3.4 bar (50 psi) | p. 16 |
| Maximum transport speed | 32 km/h (20 mph) | p. 16 |
| Pressure relief valve setting | 207 bar (3000 psi) | p. 23 |
| Knife stroke | 84 mm (3.31 in) | p. 32 |
| Reel speed | 20-48 rpm | p. 32 |
| Reverser motor cap screw torque | 68 ± 7 N·m (50 ± 5 lb ft) | p. 76 |
| Pressure relief assembly torque | 34 N·m (25 lb ft) | p. 78 |
New Holland 18HB–36HB Common Problems This Manual Covers
Draper drive slows in heavy crop
Belts that creep or stall when the crop gets thick usually point at the draper motor circuit or a flow divider rather than at belt tension. The Hydraulics section walks the pressure tests, including the pressure relief valve setting of 207 bar (3000 psi).
Manual Section: Hydraulics p. 23Knife chatters and sections wear fast
A knife that rattles in the bar and wears sections unevenly is usually running with too much slack under the hold-down clips. Clearance at X should be 0.125 - 0.64 mm (0.005 - 0.025 in), and the manual shows how to shim it back.
Manual Section: Attachments p. 115Knife head bolts back out
Loose knifehead hardware chews the drive arm and ends with a broken knife in the middle of a field. The Attachments section gives the knife head cross bolt torque at 55.5 N⋅m (41 lb ft) so the repair holds through the season.
Manual Section: Attachments p. 118Guards out of line after rock strike
One bent guard drags the knife and heats the whole bar. The manual covers guard service and the 3 mm (0.12 in) shim between the guard and the cutter bar, part of the shim layout that keeps the left knife slightly lower than the right at the overlap.
Manual Section: Attachments p. 116Reel settles or lifts unevenly
A reel that drifts down on its own, or climbs faster on one end, is a cylinder or reel lift circuit fault rather than an operator problem. The Hydraulics section carries the single and double reel lift circuits and the hydraulic cylinder work.
Manual Section: Hydraulics p. 35Reel speed control stops tracking
When reel speed cannot be adjusted, the reel lift troubleshooting chart points at a poor connection in the electrical wires or cable, a defective reel speed motor or a faulty flow control valve. The Electrical section covers remote speed control and the automatic reel speed valve.
Manual Section: Electrical p. 87Header wanders behind the tractor
A header that hunts on the road is often low on transport tire pressure or being pulled too fast. General Information calls for 3.4 bar (50 psi) in the transport tires and a maximum transport speed of 32 km/h (20 mph), plus the checks to run before pulling out.
Manual Section: General Information p. 16Frequently Asked Questions
Which headers does this manual cover?
The New Holland 18HB, 21HB, 25HB, 30HB and 36HB draper headers, under New Holland publication 84157369. One 152 page service manual covers all five sizes, and the reel lift material includes a separate single reel lift circuit for the 36 foot header.
Does it give knife head torque values?
Yes. The Attachments section lists them by knifehead type. New Holland knife head bolts and nuts torque to 9.6 - 11.3 N⋅m (7.1 - 8.3 lb ft), with separate figures given for the other knifehead styles. p. 121
Can I troubleshoot the hydraulics with this book?
Yes. The Hydraulics section starts at page 35 and covers hydraulic schematic symbols, draper drive, knife drive, reel drive, reel lift, hydraulic motors, flow dividers and the manifold block, along with schematics, troubleshooting, hydraulic system tests and high and low pressure readings. p. 35
Are decal part numbers included?
Yes. The Decals section covers safety decals, decal locations, warning signs and decal part numbers, so a faded or peeled warning on the header can be ordered by number instead of guessed at. p. 90
What do I get after purchasing this New Holland 18HB manual?
A single searchable PDF file of 152 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Am I able to print pages from this New Holland 18HB manual?
Printing is allowed without restriction. Pull the pages you need for the job and bin them when they get greasy.
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