Ford New Holland 790 Forage Harvester Service Manual (incl. Wiring)

Name: Ford New Holland 790 Forage Harvester Service Manual (incl. Wiring)
Author: New Holland

4.5/5 on Trustpilot · 155 reviews

$29.99 USD · one-time payment

Model: 790

Type: Harvester

Serial: below 700000 | above 700000

146 Pages·59 MB·Scanned PDF·English·Print-Ready

✓ Wiring Diagrams
✓ Torque Specs
✓ Bookmarks

Preview Sample Pages (PDF)

Download, file and refund questions: FAQ

This 146-page New Holland 790 Harvester Service Manual (OEM #40079011) walks you through every drivetrain and electrical system on the Model 790, from the telescoping PTO down to the Metalert II sensor harness. Inside you get full wiring diagrams for the control box and Metalert relay panel, a dedicated troubleshooting section for spout, deflector, and reversing gearbox faults, plus step-by-step teardown procedures for the cutterhead, sharpener, and blower assemblies. Set your blower drive belt to a 6½-inch spring length, and confirm the reversing gearbox belt deflects exactly 1 inch under a 60-lb pull before you button it back up. No more chasing a false Metalert detect with guesswork and a test light. This PDF carries bookmarked, searchable sections, so you can jump straight from the shear bar adjustment to the wiring diagram without flipping through 146 pages by hand.

What's Inside This Manual

System	Pages	Key Topics
Safety	4-6	Personal Safety, Machine Safety, Important
Telescoping PTO	7-10	Introduction, Removal, Disassembly, Inspection, Assembly, PTO Phasing
Main Drive Gearbox	11-16	Output Shaft, Input Shaft, Gearbox Housing Code
Electric Clutch Drive	17-22	Introduction, Changing Drive Belts, Adjusting the Armature Air Gap, Disassembly, Inspection, Assembly
Reversing Gearbox	23-30	Shifting Assembly, Drive Sheave, Feed Roll Drive Chain, Bearing Mounting Hardware, Input Shaft, Output Shaft, Idler Shaft
Feed Rolls	31-40	Introduction, Top Feed Rolls, Lower Front Feed Roll, Smooth Roll, Parts Inspection, Installation
Cutterhead	41-50	Specifications, Installing and Adjusting Cutterhead Knives, Number of Knives, Replacing the Cutterhead Assembly, Knife Inspection, Installation
Sharpener	51-56	Sharpening the Cutterhead Knives, Adjusting the Sharpening Stone, Adjusting the Stone Carrier, Sharpener Shaft, Advancing the Stone
Shear Bar and Scraper	57-64	Adjusting the Shear Bar, Replacing the Shear Bar, Inspection, Shear Bar Adjusting Mechanism, Smooth Roll Scraper
Blower	65-70	Replacing the Blower Band, Adjusting the Paddles, Replacing the Blower Belt, Blower Fan, Inspection, Assembly
Wheels and Axles	71-72	Specifications, Wheel Bearing Repair, Disassembly, Assembly
Hydraulic Components	73-76	Attachment Lift Cylinder, Hydraulic Swing Tongue Cylinder, Removal, Repair, Installation
Normal System Operation & Current Flow	77-112	Control Box Components, Circuit Breakers, Switches (Spout, Deflector, Feed Rolls), Metalert Ii Relay Panel, Sensor Assembly, Feed Roll Stopping System, Wiring Diagrams
General Electrical Troubleshooting	113-120	Spout Motor Troubleshooting, Deflector Motor Troubleshooting, Reversing Gearbox Troubleshooting, Electric Clutch Troubleshooting, Test Tools
Metalert Ii Test Set & Procedures	121-125	Metalert Ii Test Set, Test Box Functions, Signal Generator, Connecting Test Set, Voltage Check, Pull/drop Test, Sensitivity Test, Noise Test
Metalert Ii Troubleshooting Guide	126-136	Identifying Major Symptoms, Machine Resets Normally, Machine Does Not Reset Properly, Never Detects, False Detects, In-Field Test
Electrical Component Adjustments & Repair	137-139	Connector Replacement, Terminal Installation, Sensor Assembly Removal, Solder Terminal
System Adjustments & Testing	140-142	Sensor Shielded Cable Repair, Stop System Adjustment, Limit Switch Adjustment, Reversing Gearbox Actuator, Test Plug Testing
Electrical Labor Guide	143-144	Harness Connector Repair, Sensor Harness Repair, Solenoid Replacement, Electronic Panel Replacement, Gearbox Actuator Replacement

Quick Reference Specifications

Specification	Value	Page
Air blowguns pressure	35 PSI (2.4 BAR)	p. 6
blower drive belt tension	6½" spring length	p. 16
reversing gearbox drive belt tension	1" deflection at 60 lbs. (267 N) pull	p. 16
belt tension	60 lbs.-65 lbs. is required to deflect the belts 1" halfway between the sheaves on the lower strand	p. 17
hold-down springs stretched	1/2"	p. 33
540 RPM PTO Driveline Max Input	130 horsepower	p. 7
1000 RPM PTO Driveline Max Input	150 horsepower	p. 7
Main Drive Gearbox Input Shaft Rolling Torque	12 in. lbs.-18 in. lbs. (1.36 N·m-2 N·m)	p. 14
Main Drive Gearbox Output Shaft Rolling Torque	3 in. lbs.-6 in. lbs. (4 N·m-7 N·m)	p. 14
Electric Clutch Armature Air Gap	0.020"-0.050" (0.5 mm-1.3 mm)	p. 18
Shear Bar Support Clearance	0.045"-0.065"	p. 58
Blower Paddle Clearance to Band	1/32"-1/16" (0.8 mm-1.6 mm)	p. 66

Brand	New Holland
Model	790
Machine Type	Harvester
Manual Type	Service Manual
Language	English
Format	Scanned PDF (Digital Download)
Pages	146
File Size	59 MB
Manual No.	40079011
Serial Range	below 700000, above 700000
Wiring Diagrams	Yes
Hydraulic Schematics	No
Torque Specifications	Yes
Bookmarked / Indexed	Yes

Ford New Holland 790 Forage Harvester Service Manual (incl. Wiring)

What's Inside This Manual

Quick Reference Specifications

Related products