Part of the New Holland Repair Manuals.
Publication 47851907 is New Holland's own factory book for the HS Series sickle headers, a 212-page service manual covering all four models. Wiring diagrams anchor the electrical chapters of this New Holland 12HS, 14HS, 16HS, 18HS service manual PDF, tracing harnesses, connectors, external lighting, and the chopping and cutting control circuits. The cutting mechanism claims the largest share of the book, from wobble box rebuild and guard alignment through stub guards, with the reel, feed auger, pickup, roll conditioning, and head hydraulic drive filling out the rest. Set knife clip clearance to the factory 0.12 to 0.38 mm (0.005 to 0.015 in) and pull the guard bolts to 135 N·m (99.6 lb ft) before the cutterbar goes back together. Hay down is no time to hunt one torque figure. Print the pages you need and let them take grease on the bench; bookmarks and a full text layer get you to them fast.
What's Inside This New Holland 12HS, 14HS, 16HS, 18HS Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 1-24 | Foreword - Important Notice Regarding Equipment Servicing, Safety Rules (-: Personal Safety, Ecology and the Environment), Torque - Minimum Tightening Torques for Normal Assembly |
| Hydraulic Systems | 25-44 | Head and Header Hydraulic Drive |
| Electrical Systems | 45-86 | Electrical System, Harnesses and Connectors, External Lighting, Chopping and Cutting Control Systems |
| Attachment/Header Reel Control System | 87-94 | Pickup Drive Chain, Driven Sprocket, Reel Control System |
| Attachment/Header Reel | 95-108 | Pickup Reel, Reel Removal, Reel Installation, Tine Bars, Bearing Replacement |
| Attachment/Header Feed Auger | 109-122 | Auger Removal, Auger Installation, Auger Static Description, Variable-Drive Sheave |
| Attachment/Header Cutting Mechanism | 123-172 | Sickle Cutterbar, Wobble Box, Guard Alignment, Stub Guards, Wobble Drive Assembly |
| Product Feeding | 173-212 | Pickup, Roll Conditioning |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Metric non-flanged hardware M4 torque | 2.9 N·m | p. 9 |
| Guard bolt torque | 135 N·m (99.6 lb ft) | p. 135 |
| Knife clip to knife section clearance | 0.12 - 0.38 mm (0.005 - 0.015 in) | p. 137 |
| Rocker arm mount and drop link bolt torque | 115 N·m (85 lb ft) | p. 153 |
| Yoke clamp bolts torque | 68 N·m (50 lb ft) | p. 152 |
| Header drive hydraulic pressure | 24132 kPa (3500 psi) | p. 18 |
| Conditioner gearbox oil capacity | 0.59 l (0.62 US qt) | p. 18 |
| Reel speed | 52 - 83 RPM | p. 18 |
| Auger speed | 287 RPM | p. 18 |
| Roll speed | 717 RPM | p. 18 |
| Knife bolt torque | 8 - 11 N·m (71 - 97 lb in) | p. 129 |
| 12HS | ||
| Header weight (12HS, rubber rolls) | 1647 kg (3631 lb) | p. 18 |
| 14HS | ||
| Header weight (14HS, rubber rolls) | 1770 kg (3902 lb) | p. 18 |
| Class (CL) 10.9 bolt and Class (CL) 10 nut (metric non-flanged hardware, PLN/ZND finish) | ||
| Metric non-flanged hardware M24 torque | 1016 N·m | p. 9 |
New Holland 12HS, 14HS, 16HS, 18HS Common Problems This Manual Covers
New Holland 12HS sickle header cutterbar chatters, plugs in heavy alfalfa, and leaves ragged uncut stems
Inspect knife sections, guards, hold-downs, and wear plates; replace sections and guards together so a new edge is not working against a worn ledge. Set knife clip to knife section clearance at 0.12 - 0.38 mm (0.005 - 0.015 in), page 137, then stroke the knife by hand and confirm it runs without chatter.
Manual Section: Attachment/Header Cutting Mechanism p. 137Knife keeps breaking sections or snapping section bolts a few acres after every repair
Match replacement sections to the original tooth pattern and hardness; soft aftermarket sections snap early. Inspect guards for impact damage before bolting on new sections, replace any bent ones, and torque guard bolts to 135 N·m (99.6 lb ft), page 135. Check the knifeback for cracks along the bolt holes while the sections are off.
Manual Section: Attachment/Header Cutting Mechanism p. 135Header drive slows, stalls in heavy windrows, or overheats after an hour of mowing
Check hydraulic oil level and inspect the header drive hoses for kinks, leaks, or a collapsed suction line. Test drive relief pressure against the 24132 kPa (3500 psi) spec on page 18. If pressure checks good but the knife still pulls down, service the drive components in the hydraulic section starting on page 25.
Manual Section: Hydraulic Systems p. 18Severe vibration and loud knocking from the cutterbar at normal ground and knife speed
Pull the knife and check it for straightness on a flat floor; replace a bent bar rather than fighting it all season. Verify the wobble box mounting hardware: torque yoke clamp bolts to 68 N·m (50 lb ft), page 152, and rocker arm mount and drop link bolts to 115 N·m (85 lb ft), page 153.
Manual Section: Attachment/Header Cutting Mechanism p. 153Knife binds or drags partway through the stroke and will not run smoothly
Clear packed crop and dirt from the cutterbar, then stroke the knife by hand to find the tight spot. Straighten or replace misaligned guards and back off any hold-down pinching the knife; keep clearance within 0.12 - 0.38 mm (0.005 - 0.015 in), page 137, so the knife runs free before the next weather window.
Manual Section: Attachment/Header Cutting Mechanism p. 137Frequently Asked Questions
What are the torque specs for metric non-flanged hardware on the New Holland 12HS, 14HS, 16HS, 18HS?
The torque specifications for metric non-flanged hardware vary by size and class. For example, an M10 Class 8.8 bolt requires 48.7 N·m (36 lb ft), while an M24 Class 10.9 bolt requires 1016 N·m (749 lb ft). p. 9
What are the replacement specifications for knife sections on the New Holland 12HS, 14HS, 16HS, 18HS?
Replace cracked, broken, bent, or badly worn sections. Torque all knife bolts to 8 - 11 N·m (71 - 97 lb in). p. 129
What is the header gearbox capacity on the New Holland 12HS, 14HS, 16HS, 18HS sickle header?
The header gearbox capacity is 0.59 l (0.62 US qt). p. 18
What is the correct tension for the reel drive chain?
Adjust the chain so that at the chain's tightest point in its rotation, a force of 7 kg (15 lb) applied to the center of the chain deflects it 6 mm (1/4 in). p. 42
What is the required torque for the steady rest housing bolts on a New Holland 12HS, 14HS, 16HS, 18HS sickle header?
The steady rest housing bolts must be tightened to 165 N·m (122 lb ft). p. 138
What exactly do I receive with this New Holland 12HS Service Manual?
Instant PDF download. You get the full 212-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I free to print this New Holland 12HS Service Manual?
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.
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