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 |
New Holland 1920, 2120 Common Problems This Manual Covers
PTO grinds badly when engaged, will not disengage, or keeps turning with the clutch pedal down
Split the tractor only after checking clutch pedal free play and confirming the PTO friction disc is not delaminated. Inspect the sliding gear and mating gear teeth using the Power Take-Off teardown starting on page 317. Measure the one-way clutch gear bore and replace it past the 2.159 in. (54.85 mm) wear limit.
Manual Section: Power Take-Off Systems p. 317Hydraulic pump whines, loader bucket barely moves, oil looks milky after water contamination
Drain every drop of the milky oil, clean the pump suction screen, and replace the filter before condemning the pump. Refill and flow-test at rated speed against the pump flow table on page 417, which prints 7.8 gpm (29.5 lpm) and 9.3 gpm (35.2 lpm) for the two models. Bleed the suction line to clear trapped air.
Manual Section: Hydraulic System p. 417Engine cranks slowly or will not fire in cold weather, dies after a puff of white smoke
Test the battery and clean both ground straps before blaming fuel. Verify glow plug and charging circuits through the Electrical Systems section starting on page 109; alternator output should reach 35 amps at 12 volts. If cranking is strong but it still will not fire, run a compression test and compare it against the engine specifications on page 58, which print 427 psi.
Manual Section: Electrical Systems p. 109Frequently Asked Questions
What is the cylinder head bolt torque in this New Holland 1920, 2120 repair manual?
Head bolt torque is listed as 65-69 lbs. ft. (88-93 Nm) in the engine specifications on page 24. The engine supplement section starting on page 513 carries its own specifications, so work from the section that matches your engine. p. 24
What is the torque specification for the injection pump delivery valve holder on the New Holland 1920 and 2120 tractors?
The injection pump delivery valve holder torque specification is 29-33 lbs. ft. (39-44 Nm) for the 1920 model and 21.7-25.3 lbs. ft. (29-34 Nm) for the 2120 model. p. 80
Why will a New Holland 2120 not move forward or reverse after shifting, with the shuttle pulling in one direction only?
Check ground straps and the wiring connector under the tractor first; corrosion here kills the shuttle circuit. Test the shuttle switch, control box, and solenoid valves using the electronic hydraulic shuttle shift procedures starting on page 633. Verify control circuit relief pressure reaches 241.7 psi (17 kgf/cm2) before condemning the control valve. p. 633
What do you check when the gear lever will not move, the transmission is stuck in gear, or gears jump out under load?
Drain the transmission oil and check it for metal before pulling the top cover. Measure clearance between each slide gear and its shifter fork; replace the fork past the .039 in. (1.0 mm) limit on page 230. Inspect detent springs and shifter rods, and hold gear backlash under .024 in. (0.6 mm). p. 230
What format is this New Holland 1920, 2120 manual in?
Immediate download of the complete 658-page searchable Repair Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Am I able to print pages from this New Holland 1920, 2120 manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Does this New Holland 1920, 2120 Repair Manual include the hydraulic layout?
Full hydraulic system diagrams are included, covering the system circuits, the pump and filter, and the remote valve. They sit in the Hydraulic System section, on pages 371-418.
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