Part of the New Holland Repair Manuals.
The New Holland 790CP service manual PDF strips this pick-up header down system by system: 267 pages under OEM ID 47779318, running from the main gearbox and PTO shaft through hydraulics, wheels, electrical, and the feed auger. Wiring diagrams and connector pinouts anchor an electrical section that takes up more than a quarter of the book, tracing header height control, feeder engagement, and lighting circuits harness by harness. Torque tables for standard hardware and hydraulic fittings sit up front where you can find them fast. Set the picking belt tracking to its initial 42 mm (1.7 in) on the 12 ft belt, and check the height sensor against its 1000 ohm plus or minus 20% spec before you order a replacement. Rain is coming and there is nobody to call. The answer rides in your pocket: a bookmarked, text-searchable PDF that goes wherever the header does.
What's Inside This New Holland 790CP Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 4-35 | Foreword - Important Notice Regarding Equipment Servicing, Safety Rules, Safety Rules - Personal Safety, Safety Rules - Ecology and the Environment, Safety Signs |
| Main Gearbox and Drive | 36-45 | Power Take-Off Shaft |
| Hydraulic Systems | 46-71 | Header or Attachment Height System, Feeder Engagement System |
| Frames and Ballasting | 72-93 | Frame Hydraulic Hold Down, Mechanical Float |
| Wheels | 94-109 | Carrying and Transport Wheels |
| Electrical Systems | 110-185 | Electrical System, Harnesses and Connectors, Hydraulic System Control, Header Height Control, Feeding Control System, External Lighting |
| Attachments/Headers | 186-253 | Attachment/Header Feed Auger, Belt Feeding |
| Platform, Cab, Bodywork, and Decals | 254-267 | Machine Shields and Guards |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Mounting torque | 1.35 N·m (12 lb in) | p. 160 |
| Maximum Voltage | 12 V | p. 160 |
| Resistance | 1000 Ω +/- 20% | p. 160 |
| Auger weight | 544 kg (1200 lb) | p. 196 |
| Picking belt tracking initial setting (12 ft) | 42 mm (1.7 in) | p. 249 |
| Picking belt tracking initial setting (15 ft) | 52 mm (2 in) | p. 249 |
| Belt pick up solenoid power consumption | 18 W | p. 50 |
| Belt pick up solenoid duty rating | 100% | p. 50 |
| Header weight (12 ft) | 1401.6 kg | p. 31 |
| Header weight (15 ft) | 1451.5 kg | p. 31 |
| Auger tube diameter | 406 mm | p. 31 |
| Auger flighting height | 127 mm | p. 31 |
New Holland 790CP Common Problems This Manual Covers
New Holland 790CP pickup belt tracking off, belt walking sideways and shredding at the edges
Set the picking belt tracking to the initial setting on page 249: 42 mm (1.7 in) for 12 ft headers, 52 mm (2 in) for 15 ft. Run the belt slowly and watch for drift, then adjust in small steps. Inspect the roller bearings for play while you are in there; a rough bearing walks a belt fast.
Manual Section: Attachments/Headers p. 249Header height control not responding, header rides too low and tines dig into the ground
Test the height sensor with a multimeter; resistance should read 1000 ohms plus or minus 20% per the spec on page 160. On a 10 volt system, output should swing from 2.7 V lowered to 7.3 V raised, shown on page 174. Replace a sensor outside spec and torque the mounting hardware to 1.35 N·m (12 lb in).
Manual Section: Electrical Systems p. 160Belt pickup won't engage from the cab, drive stays dead with PTO running
Check the belt pickup solenoid before pulling valves apart. The coil is rated 18 W at 100% duty on page 50, so measure supply voltage at the connector with the switch on. No voltage means a harness or switch fault; chase the wiring back through the connectors. Good voltage with no click means the solenoid is done.
Manual Section: Hydraulic Systems p. 50Pickup stalls in heavy windrows, PTO driveline slips and squeals under load
Verify the PTO slip clutch is set to hold 850 N·m, the spec on page 32. A clutch that sat over winter will glaze and slip early, so free it up and let it wear in before the season starts. Slow your ground speed in heavy windrows and check the gearbox oil level while the driveline is stopped.
Manual Section: Main Gearbox and Drive p. 32Windrow feeds ragged across the draper, crop bunches at the auger and dribbles off the belt edge
Set the draper belt tracking to the initial figure on page 250: 162 mm (6.4 in) for 12 ft headers, 172 mm (6.8 in) for 15 ft. Replace bent or missing pickup tines and check the auger flighting for damage or buildup. Even feeding is what saves seed, so get the belt square before harvest opens.
Manual Section: Attachments/Headers p. 250Frequently Asked Questions
What are the torque specifications for metric non-flanged hardware on the 790CP?
The torque specifications for metric non-flanged hardware are detailed in the Introduction section. For example, an unplated M8 class 8.8 bolt requires 18 N·m (163 lb in), while a plated M8 class 8.8 bolt requires 25 N·m (217 lb in). p. 20
What is the maximum allowable wear elongation for roller chains?
The maximum allowable wear elongation for roller chains is 3%. You can measure this by measuring from the center of one pin to the center of another, with more pins included in the measurement increasing the accuracy. p. 29
What is the torque spec for the slave cylinder drain plug when bleeding the New Holland 790CP hold down system?
When bleeding the hold down system, the slave cylinder drain plug should be torqued to 35 - 39 N·m (26 - 29 lb ft) after the hose is removed. p. 64
What is the factory setting for the mechanical float spring length on a 12 ft New Holland 790CP header?
For a 12 ft header, the factory setting for the mechanical float spring length is 160 mm (6.3 in) for the right-hand side and 140 mm (5.5 in) for the left-hand side. p. 86
What is the resistance specification for the header lifting sensor on a New Holland 790CP?
The header lifting sensor has a resistance specification of 1000 Ω +/- 20%. p. 160
Is this New Holland 790CP manual a download or a disc?
All 267 pages arrive as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Is this New Holland 790CP Service Manual printable?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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