Part of the New Holland Repair Manuals.
The electronic hydraulic shuttle shift transmission is where jobs on these tractors stall, and it gets its own supplement in this New Holland 1920, 2120 repair manual PDF, a 658-page factory service book filed under OEM ID 40192020. Wiring diagrams trace the charging and glow plug circuits, hydraulic schematics map the pump, filter, and remote valve circuits, and troubleshooting charts walk each symptom back to a testable cause. Procedures run from injection pump overhaul through clutch, PTO, differential, and power steering work, including full instructions for splitting the tractor to pull the transmission. Check your alternator against its 35-amp, 12-volt rating, test rotor coil resistance at 3 to 4 ohms at 68°F, and torque the delivery valve holders on a 1920 to 29-33 lbs. ft. Out at the back of the field there is no one to ask, so the file is bookmarked by section and text-searchable: the spec you need is a search away instead of a page-by-page scroll.
What's Inside This New Holland 1920, 2120 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| New Holland 1920, 2120 Repair Manual | 1-2 | |
| Production Date Codes and Serial Numbers | 3 | Tractor Series Identification Plate, Production Identification Number, Production Model Code, Production Unit Date Code, Engine Serial Number |
| Safety Precautions | 4-6 | Personal Considerations, Equipment Considerations, Hand Tools, Electricity, General Considerations, Operational Considerations |
| Service Techniques | 7-8 | Service Safety, Hoses and Tubes |
| Engine Systems | 9-82 | Engine and Lubrication System, Cooling System, Trouble Shooting, Specifications and Special Tools |
| Fuel System | 83-108 | Diesel Fuel System Injection Pump, Injectors, Trouble Shooting and Specifications |
| Electrical Systems | 109-176 | Wiring, Switches, Glow Plugs and Instrumentation, Battery, Starting Systems, Charging System |
| Clutches | 177-198 | Single Clutch, Double Clutch |
| Transmission Systems | 199-316 | Non-Synchromesh Gear Transmission Model 1920, Non-Synchromesh Gear Transmission Model 2120, Synchromesh Shuttle Transmission Model 1920 |
| Power Take-Off Systems | 317-336 | Power Take-Off Systems Model 1920, Power Take-Off System Model 2120 |
| Differential, Rear Axle and Brakes | 337-370 | Model 1920, Model 2120 |
| Hydraulic System | 371-418 | Hydraulic System Circuits, Hydraulic Pump and Filter, Remote Valve |
| Steering System | 419-448 | Power Steering System |
| Front Axle and Related Parts | 449-488 | Two-Wheel Drive, Four-Wheel Drive |
| Separating the Tractor | 489-512 | Front Axle Removal, Separating Front End and Engine, Separating Engine and Transmission Clutch Housing, Transmission Removal, Rear Axle and Center Housing Removal |
| Supplement Engine Systems | 513-592 | Engine Description and Operation, Engine Overhaul, Engine Lubrication System Description, Engine Lubrication System Overhaul |
| Supplement Fuel Systems | 593-632 | Fuel Variation Mechanism, Compact Timing Device, Pumping Elements, Delivery Valves, Injection Pump Removal, Governor Operation, Injectors |
| Supplement Transmission Systems | 633-658 | Electronic Hydraulic Shuttle Shift Transmission, Hydraulics, Control Valve, Oil Strainer and Magnet, Ehss Control Valve Overhaul, Shuttle Switch, Control Box, Solenoid Valve |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Crankshaft Pulley Retaining Nut | 274-333 Nm (203-246 lbs. ft.) | p. 80 |
| Tachometer Drive Shaft Plate | 6.5-9.4 Lbs. Ft. (9-13 Nm) | p. 80 |
| Alternator Rating | 35 Amps at 12 Volts Max | p. 175 |
| Rotor Coil Resistance | 3-4 Ohm at 68°F (20°C) | p. 175 |
| Snap Ring - Max. ID | 0.945 in. (24 mm) | p. 229 |
| Gear Backlash | .008 in. (0.2 mm) | p. 24 |
| Pump Capacity | 2.64 gpm (10 lpm) | p. 303 |
| Pump Speed | 2500 rpm (max.) | p. 303 |
| One-Way Clutch Gear Bore | 2.156 in. (54.75 mm) | p. 335 |
| One-Way Clutch Gear Bore Max. Wear Limit | 2.159 in. (54.85 mm) | p. 335 |
| Head bolt torque | 88-93 Nm | p. 24 |
| Rocker post stud nut torque | 27-39 Nm | p. 24 |
