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 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 |
