Part of the New Holland Repair Manuals.
Knife register, wobble box, feed auger flighting clearance: this New Holland 740CF, 800C service manual PDF settles those questions across 396 pages of factory data for the 740CF Super Flex and 800C auger headers, OEM 47627581. Electrical work claims the largest share of the book: wiring diagrams, harness and connector pinouts, and the reel speed and position circuits that decide whether your header answers the cab controls. Hydraulic schematics trace both reel positioning circuits, vertical and fore-and-aft, and the cutting mechanism chapters take the sickle cutterbar, knife drive belt, and hold-down clips from teardown through adjustment. Torque the knife drive shaft nut to 299.6 N·m (221 lb ft) and set the header height sensor lock nut at 1.35 N·m before you condemn the sensor. It's you, the header, and nobody to ask. Download the bookmarked, text-searchable PDF and print the pages for the job; they can take grease on the bench while the weather holds.
What's Inside This New Holland 740CF Super Flex, 800C Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 1-50 | Basic Instructions - Important Notice Regarding Equipment Servicing, Personal Safety, Safety Rules - Ecology and the Environment, Safety Rules |
| Main Gearbox and Drive | 51-64 | Power Take-Off Shaft, Main Gearbox and Drive Service |
| Clutch | 65-76 | Slip Clutch or Flywheel Damper |
| Hydraulic Systems | 77-110 | Reel Vertical Positioning System, Reel Fore-And-Aft Positioning System |
| Electrical Systems | 111-206 | Electrical System, Hydraulic System Control, Harnesses and Connectors, External Lighting, Feeding Control System, Cab Header Controls, Reel Speed and Position Control |
| Attachment/Header Reel | 207-220 | Reel Removal, Reel Installation, Reel Arm Removal, Reel Arm Installation, Exploded View |
| Attachment/Header Reel Control System | 221-236 | Reel Drive System, Drive Chain Adjustment, Drive Sprocket Removal, Drive Sprocket Installation, Reel Drive Motor Mount Replacement |
| Attachment/Header Cutting Mechanism | 237-306 | Wobble Box, Knife Drive Belt, Sickle Cutterbar, Hold-Down Clips, Finger Guard, Knife Register |
| Attachment/Header Feed Auger | 307-346 | Feed Auger Flighting Clearance, Feed Auger Drive Chain, Retractable Finger Assembly, Auger Removal, Auger Installation |
| Attachment/Header Frame | 347-372 | A-Frame Removal, A-Frame Installation, Crop Divider Removal, Crop Divider Installation, Long Divider |
| Platform, Cab, Bodywork, and Decals | 373-396 | Machine Shields and Guards, Decals and Plates, Fenders and Guards |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| M4 Metric Non-Flanged Hardware Class 8.8 Bolt and Class 8 Nut Unplated | 2.2 N·m (19 lb in) | p. 35 |
| M5 Metric Non-Flanged Hardware Class 8.8 Bolt and Class 8 Nut Unplated | 4.5 N·m (40 lb in) | p. 35 |
| Mounting torque | 1.35 N·m (12 lb in) | p. 175 |
| Header height sensor lock nut torque | 1.35 N·m (11.9 lb in) | p. 186 |
| Knife drive shaft nut torque | 299.6 N·m (221 lb ft) | p. 282 |
| M12 knife assembly bolt torque | 127 - 155 N·m (93.7 - 114.3 lb ft) | p. 282 |
| Maximum operating slope | 26% | p. 9 |
| Flex solenoid nominal voltage | 12 V | p. 81 |
| Flex solenoid power consumption | 18 W | p. 81 |
| Hydraulic fluid pressure switch installation torque | 20 N·m | p. 139 |
| Height sensor resistance | 1000 Ω | p. 175 |
| Reel position sensor mounting bolt torque | 2 N·m | p. 197 |
New Holland 740CF Super Flex, 800C Common Problems This Manual Covers
New Holland 740CF auger drags crop and plugs in soybeans, feed auger sits low in header floor
Clean packed mud and crop residue out of the auger trough before adjusting anything. Set flighting clearance using the feed auger procedures starting on page 307, raising the auger until crop feeds without dragging. Reinstall the auger covers and torque the cover bolts to 10 N·m per page 345.
Manual Section: Attachment/Header Feed Auger p. 307Header height control jumps around and flex system stops responding to ground contours
Check each header height sensor against the 1000 Ω resistance spec on page 175 and inspect harness connectors for chafing, corrosion, and bent pins. Verify the flex solenoids receive their nominal 12 V (page 81). After replacing a sensor, torque the lock nut to 1.35 N·m per page 186 before recalibrating.
Manual Section: Electrical Systems p. 175Knife sections wear fast, ragged cut and torn stalks across the cutterbar
Replace worn knife sections, guards, and section bolts as matched sets; mixing new sections against worn guards wears both out early. Set hold-down clip clearance to 0.1 to 1 mm with shims per page 284, then verify knife to finger guard clearance holds 0.0 to 0.5 mm per page 285.
Manual Section: Attachment/Header Cutting Mechanism p. 284Reel tines snap off and reel drive components wear out early every harvest season
Inspect reel tines and arms for cracks and replace damaged tines as a kit; one bent tine loads its neighbors. Adjust reel drive chain tension using the drive system procedures starting on page 221. If the horizontal position sensor reads wrong, remount it and torque the mounting bolts to 2 N·m per page 197.
Manual Section: Attachment/Header Reel Control System p. 221Wobble box runs hot and knocks, knife drive vibrates at full speed
Drain and refill the wobble box with 2.2 L of oil per the capacity spec on page 283, then torque the filler plug to 10 to 15 N·m. Check the knife drive shaft nut and retorque to 299.6 N·m (221 lb ft) per page 282 if loose. Inspect the knife drive belt for glazing while the shields are off.
Manual Section: Attachment/Header Cutting Mechanism p. 283Frequently Asked Questions
What are the torque specifications for the knife drive pulley nut on the New Holland 740CF?
The torque specification for the M24 nut securing the drive pulley to the knife drive shaft is 299.6 N·m (221 lb ft). p. 282
How do I adjust the float on the New Holland 740CF cutterbar?
To adjust the cutterbar weight, raise the cutterbar approximately 305 mm (12 in) off the ground and adjust the torsion spring tension until the flex arm is 3 - 6 mm (0.12 - 0.24 in) off the down stop. Turning the nut counterclockwise lightens the cutterbar, while turning it clockwise increases the weight. p. 289
What are the replacement specifications for the header height sensor on a New Holland 740CF Super Flex, 800C?
The header height sensor has a mounting torque of 1.35 N·m (12 lb in), a resistance of 1000 Ω +/- 20%, and an active electrical rotation of 85° +/- 2°. p. 175
What is the oil capacity for the wobble box on the 740CF?
The wobble box should be filled with 2.2 liters (0.58 US gal) of New Holland Ambra Hypoide 90 oil. p. 283
What is the torque specification for the wobble box mount bolts on the New Holland 740CF Super Flex, 800C?
The two M16 x 50 mm bolts used to mount the wobble box should be torqued to 301 - 405 N·m (222 - 299 lb ft). p. 277
How is this New Holland 740CF Service Manual delivered?
All 396 pages arrive as one searchable PDF at checkout. Read it at the desk, then take the phone out to the machine.
Can I print specific sections of this New Holland 740CF Service Manual?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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