Part of the New Holland Repair Manuals.
A split tractor on jack stands is no place to work from memory, and the New Holland 1120, 1220 repair manual PDF backs you up with 366 pages of factory procedure for both models, filed under OEM number 42112020. Wiring diagrams trace the starting, charging, and glow plug circuits, while hydraulic schematics map the pump, filter, and remote valve routing through the whole system. Both the 9 X 3 gear transmission and the hydrostatic drive get full overhaul coverage, along with the mid-mount PTO, differential lock, and four wheel drive front axle. Before you condemn a slow starter, mic the commutator against its 1.142 in. (29 mm) minimum and check brush length at 0.354 in. (9 mm). Halfway through a clutch job is a bad time to hunt one clearance. This bookmarked, text-searchable file rides on whatever screen you carry to the tractor, so the number is there while the weather holds.
What's Inside This New Holland 1120, 1220 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Production Date Codes and Serial Numbers | 3 | Tractor Identification Plate, Production Identification Number, Production Model Code, Production Unit Date Code, Engine Serial Number |
| Safety Precautions | 4-6 | Personal Considerations, Machine Guards, Lifting Appliances, Compressed Air, Hand Tools, Electricity |
| Service Techniques | 7-8 | Service Safety, Cleaning, Hoses, Tubes, Connectors |
| Engine Systems | 9-66 | Engine and Lubrication System, Cooling Systems, Trouble Shooting, Specifications and Special Tools |
| Fuel System | 67-88 | Injection Pump, Injectors, Trouble Shooting, Specifications and Special Tools |
| Electrical Systems | 89-144 | Wiring, Switches, Glow Plugs and Instrumentation, Battery, Starting Systems, Charging System, Engine Stop Solenoid |
| Clutches | 145-156 | Single Clutch, Servicing Clutch Associated Components |
| Transmission Systems | 157-210 | Standard 9 X 3 Gear Transmission, Hydrostatic Transmission, Hydrostatic Transmission Gearbox, Hydrostatic Transmission Control Linkage |
| Power Take-Off | 211-224 | Standard Power Take-Off, Mid-Mount Power Take-Off |
| Differential, Rear Axle and Brakes | 225-238 | Differential Assembly, Differential Lock, Rear Axle, Final Pinion, Brake Assembly, Parking Brake |
| Hydraulic System | 239-278 | Hydraulic System Circuits, Hydraulic Pump and Filter, Remote Control Valves |
| Steering System | 279-312 | Steering System Models 1120 and 1220, Power Steering System Models 1120 and 1220 |
| Front Axle | 313-334 | Front Axle Two Wheel Drive, Front Axle Four Wheel Drive |
| Wheels and Tires | 335-342 | Tread Setting, Weight Limitations, Lug Bolt Torque, Liquid Ballast, Tire Inflation |
| Separating the Tractor | 343-366 | Front Axle Removal, Engine and Clutch Housing Separation, Clutch Housing and Rear Transmission Separation, Extension Housing Separation, ROPS Removal |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Compressed air pressure | 100 psi (6.9 bar) | p. 4 |
| Fan Diameter | 13.386 in. (360 mm) | p. 63 |
| Armature Shaft Runout (Maximum) | 0.002 in. (0.05 mm) | p. 141 |
| Brush Length (Minimum) | 0.354 in. (9 mm) | p. 141 |
| Theoretical Displacement of the Pump | 1 cu. in./rev. (16.4 cc/rev.) | p. 209 |
| Maximum Working Pressure | 3550 psi (250 kg/cm²) | p. 209 |
| Connector fitting tightening torque | 51 ± 7 lbs. ft. (69 ± 9 Nm) | p. 302 |
| Piston retaining nut tightening torque | 26 lbs. ft. (35 Nm) | p. 304 |
| Steering Gear Shaft Pre-Load | 4.4-9.9 lbs. (2-4.5 Kg) pull | p. 310 |
| Steering Cylinder Piston-to-Tube Clearance | 0.027 in. (0.7 mm) | p. 311 |
| Front Axle Free-Play | 0.12 in. (0.3 mm) | p. 332 |
| Backlash between differential gear and differential pinion | 0.004-0.006 in. (0.1-0.15 mm) | p. 63 |
