Part of the John Deere Repair Manuals.
A rockshaft that won't lift, a collar-shift transmission that grinds going into gear: those problems don't wait for a slow week between planting and harvest. The John Deere 1020, 1120, 1630 technical manual PDF, factory publication TM4286, covers all three tractors across 368 pages. Wiring diagrams trace both the Bilux and sealed-beam lighting circuits from key switch to alternator, and hydraulic schematics map oil flow through the pump, rockshaft, and selective control valves. The power train section takes the largest share of the book: engine clutches, high-low shift unit, transmission, differential, final drives, plus independent and continuous-running PTOs. Check a suspect air cleaner against the 355 mm water head vacuum limit, then torque the start safety switch to 35 ft-lbs. Guess wrong on a shim pack and you split the tractor twice. Bookmarks and a real text layer put you two clicks from the procedure, so your weekend repair stays a weekend repair.
What's Inside This John Deere 1020, 1120, 1630 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 5-32 | Specifications, Predelivery, Delivery and After-Sales Inspections, Lubrication and Periodic Service, Engine and Tractor Tune-Up, Tractor Separation |
| Engine | 33-92 | General Information, Diagnosing Malfunctions, Cylinder Head and Camshaft, Cylinder Block, Liners, Pistons and Connecting Rods, Crankshaft, Main Bearings and Flywheel |
| Fuel System | 93-124 | Fuel Tank, Water Trap, Transfer Pump, Fuel Filter and Air Cleaner, Roto-Diesel Fuel Injection Pump, Fuel Injection Nozzles, Cold Weather Starting Aids |
| Electrical System | 125-172 | Diagnosing Malfunctions, Bilux Lighting System, Sealed-Beam Lighting System, Starting Motor, Alternator and Regulator |
| Power Train | 173-256 | Engine Clutches and Clutch Linkage, High-Low Shift Unit, Collar-Shift Transmission, Differential, Final Drives, Independent PTO, Continuous-Running PTO |
| Front Axle, Steering System and Brakes | 257-290 | Front Axle, Steering System, Brakes |
| Hydraulic System | 291-352 | Oil Reservoir, Filter, Valves and Oil Cooler, Hydraulic Pump and Transmission Oil Pump, Rockshaft, Selective Control Valves, Remote Cylinder |
| Miscellaneous | 353-368 | Belt Pulley, Operator's Seats, Front and Rear Wheels, Roll Guard |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Standard torque for 1/4 inch UNC/UNF cap screws (Grade 6.8) | 1 mkp (7 ft.lbs.) | p. 21 |
| Standard torque for 5/16 inch UNC/UNF cap screws (Grade 6.8) | 2 mkp (14 ft.lbs.) | p. 21 |
| Vacuum gauge reading (not restricted) | 355 mm water head | p. 98 |
| Start safety switch torque | 4.8 mkp (35 ft.lbs.) | p. 132 |
| Key switch resistor | 1 ohm | p. 143 |
| Thickness of a new engine clutch disk | 9.3 to 9.9 mm | p. 189 |
| Wear tolerance for engine clutch disk | 6.3 mm | p. 189 |
| Thickness of a new PTO clutch disk | 7.7 to 8.3 mm | p. 188 |
| Wear tolerance for PTO clutch disk | 4.7 mm | p. 188 |
| Spring of by-pass valve on tractors without High-Low shift unit (Free length) | approx. 65 mm (2.56 in.) | p. 241 |
| Spring of by-pass valve on tractors with High-Low shift unit (Free length) | approx. 62 mm (2.44 in.) | p. 46 |
| I.D. of rockshaft cylinder | 82.510 to 82.590 mm (3.2485 to 3.2515 in.) | p. 341 |
John Deere 1020, 1120, 1630 Common Problems This Manual Covers
John Deere 1020 three-point hitch stays stuck raised, lift arms will not lower with rate-of-drop screw open
Check the rockshaft valve housing for sticking pressure and discharge valves. Test each valve spring; tension should read 4.5 to 5.5 kp (11 to 13 lbs.) at 22 mm compressed length, per the specs on page 341. Clean the valves, inspect seats for scoring, and torque the valve housing cap screws to 4.8 mkp (35 ft.lbs.) on reassembly.
Manual Section: Hydraulic System p. 341PTO will not engage or slips under load, shaft stops turning when baler plunger cycles
Check clutch linkage free travel first, then split the tractor and measure the PTO clutch disks. A new disk runs 7.7 to 8.3 mm thick, and 4.7 mm is the wear limit listed on page 188. Inspect the pressure plate for heat checking and replace disks in complete sets so engagement stays even all season.
Manual Section: Power Train p. 188Tractor loses all gauge power after shutdown and engine will not crank on restart
Check battery voltage first; the starting motor needs a full 12 volts. Clean and tighten the ground strap and switch-box terminals, then test the key switch resistor for 1 ohm, the spec on page 143. Reinstall a suspect start safety switch torqued to 4.8 mkp (35 ft.lbs.), and trace intermittent feeds with the wiring diagram on page 134.
Manual Section: Electrical System p. 143Engine clutch slips under draft load in high range, engine revs but tractor barely pulls
Verify free pedal travel at the clutch linkage before splitting the tractor; a dragging release bearing wears disks fast. Measure the engine clutch disk once inside: new thickness runs 9.3 to 9.9 mm, and 6.3 mm is the wear tolerance, per page 189. Replace glazed or oil-soaked disks and fix the leak that soaked them before harvest.
Manual Section: Power Train p. 189Engine hard to start on old diesel, stumbles under load but idles smooth
Drain the water trap and replace the fuel filter element before blaming the injection pump; stale fuel and water cause most hard starts. Test intake restriction with a vacuum gauge against the 355 mm water head limit on page 98, and replace the outer air element if it reads higher. Bleed the fuel system after any filter change.
Manual Section: Fuel System p. 98Frequently Asked Questions
What are the torque specifications for the cylinder head cap screws on the John Deere 1020, 1120, and 1630 tractors?
The torque specification for the cylinder head cap screws is 15 mkp (110 ft.lbs.). p. 47
What is the correct intake and exhaust valve clearance on John Deere 1020, 1120, 1630 tractors?
The valve clearance for the intake valve is 0.35 mm (0.014 in.) and for the exhaust valve is 0.45 mm (0.018 in.), measured with the engine hot or cold. p. 6
What is the fuel tank capacity for the John Deere 1020, 1120, and 1630 tractors?
The fuel tank capacity for the 1020 and 1120 models is 62.5 liters (16.5 U.S. gallons), while the 1630 model has a capacity of 74 liters (19.5 U.S. gallons). p. 7
What is the engine oil pressure spec for the John Deere 1020, 1120, 1630 tractors at 2500 rpm?
The engine oil pressure at 2500 rpm should be between 3.5 and 4.2 kp/cm2 (50 to 60 psi). p. 19
What is the correct fan belt tension for the John Deere 1020, 1120, and 1630 tractors?
The fan belt should have 19 mm (0.75 in.) of deflection when a 9 kp (20 lbs.) force is applied midway between the crankshaft and the alternator or water pump. p. 85
How quickly can I access this John Deere 1020 manual after buying?
You download the Technical Manual yourself: 368 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Does this John Deere 1020 manual allow printing?
Printing is allowed without restriction. Pull the pages you need for the job and bin them when they get greasy.
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