Part of the New Holland Repair Manuals.
From the bevel gearbox through the reversing gearbox, blower, feed rolls, cutterhead, shear bar, and Metalert II electrical system, this New Holland 900 service manual PDF (OEM 40090013) works the forage harvester's whole driveline end to end across 174 pages. Wiring diagrams for both the basic model and the Metalert II circuits anchor the electrical section, while troubleshooting flowcharts trace a stopped feedroll back to the exact relay, diode, or detector cable at fault. Exploded views support every gearbox and clutch repair, and hardware torque tables sit up front where you can find them without digging. Fill the bevel gearbox with 4 qt. (3.8 L) of oil and set the feedroll slip clutch at 650 to 700 ft. lbs. Harvest does not wait while you hunt one backlash figure. Bookmarked and keyword-searchable, this file goes wherever the chopper is parked: cab, shop, or headland.
What's Inside This New Holland 900 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 3-4 | Personal Safety, Machine Safety, Precautionary Statements, Safety Rules |
| Hardware Key and Torques | 5-6 | Hardware Identification, Assembly Torques, Hydraulic Tube Fittings, O-Ring Boss Plugs |
| Bevel Gearbox | 7-16 | Removal, Disassembly |
| Reversing Gearbox | 17-38 | Operation, Electric Clutch Servicing, Reversing Gearbox Repair |
| Blower | 39-50 | Operation, Repair |
| Driveline Protection | 51-56 | Feedroll Drive Slip Clutch, Cutterhead Clutch |
| Feed Rolls | 57-66 | Flip-Up Feedrolls, Top Feedrolls, Bottom Front Feedroll |
| Cutterhead | 67-78 | Cutterhead Knife Installation and Adjustment, Cutterhead Removal, Sharpener System |
| Shear Bar and Smooth Roll Scraper | 79-90 | Adjusting the Shear Bar, Shear Bar Adjusting Mechanism |
| Hydraulic Components | 91-98 | Attachment Lift Cylinder, Hydraulic Tongue Swing Cylinder |
| Wheels and Axles | 99-100 | Wheel Bearing Repair |
| Electrical System Overview and Components | 101-109 | Control Box, Circuit Breakers, Relays, Diodes, Connectors, Terminal Block |
| System Operation and Wiring Diagrams | 110-128 | Feed Roll Stopping System, Flipper Motor, Spout Motor, Basic Model Wiring, Metalert Ii Wiring |
| Troubleshooting Guides | 129-150 | Bypassing Metal Detector, Basic Harvester Troubleshooting, Metalert Ii Troubleshooting, Metal Detector Quick Check |
| Electrical Adjustments and Repair | 151-174 | Metalert Ii Troubleshooting Flowcharts, Main Harness Connector Repair, Detector Cable Repair, Stopping System Repair |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Output shaft rolling torque | 8 in. lbs.-14 in. lbs. | p. 7 |
| Input shaft and output shaft combined rolling torque | 15 in. lbs.-25 in. lbs. | p. 7 |
| Paddle bolt torque | 125 ft. lbs. (164 N·m) | p. 39 |
| Blower slip clutch torque | 500 ft. lbs. (678 N·m) | p. 39 |
| Feedroll slip clutch torque | 650-700 ft. lbs. (881-949 N·m) | p. 51 |
| Cutterhead slip clutch torque | 1200-1250 ft. lbs. (1630-1695 N·m) | p. 51 |
| Bottom front feedroll stub shaft allowable run-out | .010" (.25 mm) | p. 57 |
| Smooth roll scraper clearance | .004" (.1 mm) | p. 57 |
| Knife bolt torque | 175-200 ft. lbs. (237-270 N·m) | p. 67 |
| Knife support block torque | 175 ft. lbs. (237 N·m) | p. 67 |
| Pivot arm force | 10 lbs.-20 lbs. | p. 83 |
| Bevel Gearbox Oil Capacity | 4 qt. (3.8 L) | p. 7 |
New Holland 900 Common Problems This Manual Covers
Chop quality ragged and power demand climbing even right after sharpening the knives
Adjust the shear bar to the cutterhead before blaming the knives; a wide gap ruins chop overnight. Set the adjusting mechanism so the pivot arm needs 10-20 lbs. of force to move, then tighten the shear bar bolt to 66 ft. lbs. (90 N·m) as shown on page 85. Recheck after the first load.
Manual Section: Shear Bar and Smooth Roll Scraper p. 85Whole driveline shakes at PTO speed with universal joints clicking under load
Grease every universal joint and check the PTO shaft splines for rock; worn splines hammer the entire driveline. If the vibration tracks back to the bevel gearbox, drain and refill it with 4 qt. (3.8 L) of oil, then set gear backlash to 0.006-0.015 inch (0.15-0.38 mm) during reassembly, starting on page 7.
Manual Section: Bevel Gearbox p. 7Metal detector trips on clean crop or feedrolls fail to stop on real metal
Test the stopping system before harvest, not during it. Verify the stop solenoid holds at 0.7 amps, wiring detail on page 110, then work through the quick checks in the troubleshooting guides beginning on page 129 to separate false detects from a system that never trips. Clean the detector area of tramp iron first.
Manual Section: Troubleshooting Guides p. 129Frequently Asked Questions
What is the minimum torque for a 1/2 inch Grade 5 SAE bolt?
For a 1/2 inch Grade 5 SAE bolt, the minimum tightening torque for an unplated application is 82 foot-pounds (111 Newton-metres), and for a plated application, it is 66 foot-pounds (89 Newton-metres). p. 5
How do you fix new Holland 900 blower fan wobbles and throws vibration, weak spout blow distance?
Remove the blower band and check the paddles and star plate for wash-out; worn paddles kill blow distance fast. Grab the fan and feel for bearing play while you are in there. Torque replacement paddle bolts to 125 ft. lbs. (164 N·m) and verify the slip clutch is set at 500 ft. lbs. (678 N·m), covered starting on page 39. p. 39
How do you fix cutterhead growls, rubs, or turns rough by hand with chop quality falling off?
Spin the cutterhead by hand with the drive disconnected. Rolling torque should read 10-15 in. lbs. (1-1.7 N·m); anything notchy means the bearings are done. Inspect the knives and support blocks while the shields are off, then torque knife bolts to 175-200 ft. lbs. (237-270 N·m) per the procedure starting on page 67. p. 67
How do you fix feedrolls slip under load and feed crop unevenly, slug feeding in heavy windrows?
Check the feedroll slip clutch first; it should hold 650-700 ft. lbs. (881-949 N·m), spec listed on page 51. If the clutch checks out, pull the feedroll pads and inspect them for wear, then dial-indicate the bottom front feedroll stub shaft and replace it if run-out exceeds .010 inch (.25 mm). p. 51
What exactly do I receive with this New Holland 900 Service Manual?
Delivery is instant: a 174-page searchable PDF is yours the second checkout clears. Laptop, tablet, or phone, all fine.
Is this New Holland 900 Service Manual printable?
Print away. There is no DRM and no page limit. Many buyers print one chapter at a time and leave the rest on a tablet.
Are wiring diagrams part of this New Holland 900 Service Manual?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the New Holland 900. See page 103 for an example.
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