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John Deere 4020 Tractor Specifications

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Complete specifications for the John Deere 4020 tractor, with the diesel, gasoline and LP-gas versions side by side. Every figure is transcribed from the specifications pages of the factory operator's manual, OM-R34410. The 4020 was the six-cylinder flagship of John Deere's New Generation line, built at Waterloo, Iowa from 1963 to 1972. The diesel used a larger 404 cu. in. engine and a 24-volt starting system; the gasoline and LP-gas tractors shared a 340 cu. in. engine. Buyers could choose the Syncro-Range or the Power Shift transmission, and the manual lists both.

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Horsepower

Observed horsepower, official at 2200 engine rpm.1

Specification Diesel Gasoline LP-Gas
PTO (observed) 91 hp 88 hp 90 hp
Drawbar (observed) 78 hp 75 hp 79 hp

Engine

Specification Diesel Gasoline LP-Gas
Type 6-cylinder, in-line, valve-in-head — all versions
Bore and Stroke 4-1/4 × 4-3/4 in. 4-1/4 × 4 in. 4-1/4 × 4 in.
Displacement 404 cu. in. 340 cu. in. 340 cu. in.
Compression Ratio 16.5 to 1 7.5 to 1 9.0 to 1
Firing Order 1-5-3-6-2-4 — all versions
Intake Valve Clearance 0.018 in. 0.015 in. 0.015 in.
Exhaust Valve Clearance 0.018 in. 0.028 in. 0.028 in.
Injection Pump Timing TDC — —
Engine Speeds
Idle for Engine Shutoff —2 420 rpm 500 rpm
Normal Slow Idle 600 rpm 650 rpm 650 rpm
Working Range 1500 to 2200 rpm — all versions
Maximum Transport Speed 2500 rpm — all versions
Cooling and Lubrication
Cooling Pressurized with centrifugal pump; heavy-duty thermostat
Lubrication System Force-feed pressurized type with full-flow oil filter

Electrical & Ignition

Specification Diesel Gasoline LP-Gas
Starter and Generator Voltage 24 volts 12 volts 12 volts
Lights and Accessory Voltage 12 volts — all versions
Batteries (12-volt, 78-plate, 75 amp-hour) Two, connected in series One One
Distributor Timing (at 2000 rpm) — 20° BTDC 25° BTDC
Distributor Point Gap — 0.016 in. 0.016 in.
Spark Plug Gap — 0.025 in. 0.015 in.

Capacities

Fuel Tank, Diesel and Gasoline 34 U.S. gals.
Fuel Tank, LP-Gas (80% full) 45 U.S. gals.
Crankcase, Dry System 9 U.S. qts.
Crankcase, at Service Intervals 8 U.S. qts.
Transmission-Hydraulic System, Syncro-Range Dry 13 U.S. gals.; at service 10 U.S. gals.
Transmission-Hydraulic System, Power Shift Dry 17 U.S. gals.; at service 14 U.S. gals.
Air Cleaner, Diesel 4-3/4 U.S. pints
Air Cleaner, Gasoline and LP-Gas 2-3/4 U.S. pints
Cooling System 24 U.S. qts.
Hi-Crop Final Drive Housings 1-3/4 U.S. qts.
Belt Pulley 2-1/2 U.S. pints

Transmissions

Specification Syncro-Range Power Shift
Type Syncro-Range, constant mesh Planetary gears, hydraulically actuated wet disk clutches and brakes
Gear Selections 8 forward and 2 reverse 8 forward and 4 reverse
Shifting 4 stations, synchronized shifting within stations Hydraulic power shifting controlled by speed selector

Ground speeds for both transmissions are in the ground speed table below.

Power Take-Off

Type Independent PTO with front and rear power take-off. Stub shafts used for rear dual-speed PTO speed conversion
Front PTO Speed (1900 engine rpm) 1000 rpm
Rear PTO Speed, Dual Speed 540 or 1000 rpm
Rear PTO Speed, Single Speed 1000 rpm

Hydraulics & Brakes

Hydraulic System Closed center, constant pressure. Includes power steering, power brakes, and implement control
Maximum Pressure 2250 psi
Brakes Hydraulically power actuated, disk-type, operating in oil

Tires

Tire Row-Crop Standard
Front 6.00-16, 6-ply 7.50-18, 6-ply
Rear 15.5-38, 6-ply 18.4-34, 6-ply

Additional tires were available for special purposes. Front and rear wheel tread settings are covered on pages 16 to 20 of the manual.

Dimensions

Dimension Row-Crop Standard
Wheelbase 97-1/2 in. 89 or 100-1/4 in.
Overall Length 151 in. 150-1/8 in.
Overall Height 88-3/4 in. 88-1/4 in.
Height to Steering Wheel 77-7/8 in. 78-1/2 in.
Width (Regular Axle) 89-5/8 in. 89-5/8 in.
Turning Radius 119 in. 130-1/2 in.

Shipping Weights

Syncro-Range tractors equipped for average field service, less fuel and ballast. Add 375 lbs. for a Power Shift transmission.

Engine Row-Crop Standard
Diesel 8436 lbs. 9044 lbs.
Gasoline 8228 lbs. 8793 lbs.
LP-Gas 8319 lbs. 8918 lbs.

Ground Speeds

Miles per hour for row-crop tractors with 15.5-38 rear tires (loaded radius 28.5 in.). The manual says standard tractors have similar ground speeds. Engine working speeds may be varied between 1500 and 2200 rpm on the hand throttle, and transport speeds up to 2500 rpm on the foot throttle. Both transmissions have eight forward speeds; the Syncro-Range has two reverse speeds and the Power Shift four.

Gear 1500 rpm, Syncro-Range 1500 rpm, Power Shift 1900 rpm3, Syncro-Range 1900 rpm3, Power Shift 2200 rpm, Syncro-Range 2200 rpm, Power Shift 2500 rpm (Max. Foot Throttle), Syncro-Range 2500 rpm (Max. Foot Throttle), Power Shift
1st 1.2 1.2 1.6 1.5 1.8 1.7 2.1 2.0
2nd 2.0 1.7 2.5 2.1 2.9 2.4 3.3 2.8
3rd 2.6 2.6 3.3 3.3 3.8 3.8 4.3 4.3
4th 3.4 3.3 4.2 4.2 4.9 4.9 5.6 5.6
5th 4.2 5.64 5.3 5.5 6.1 6.3 6.9 7.2
6th 5.5 7.44 6.9 7.1 8.0 8.2 9.1 9.3
7th 7.1 7.4 9.0 9.4 10.4 10.8 11.8 12.3
8th 11.5 12.3 14.6 15.6 16.9 18.0 19.2 20.5
1st Reverse 2.5 1.4 3.2 1.7 — — — —
2nd Reverse 4.1 1.9 5.2 2.5 — — — —
3rd Reverse — 3.0 — 3.8 — — — —
4th Reverse — 3.9 — 4.9 — — — —

Notes:
1 The manual states that these observed horsepower figures are official at 2200 engine rpm. It does not cite a Nebraska test number.
2 The diesel column is left blank (dotted) in the manual for idle for engine shutoff.
3 1900 engine rpm gives the SAE rated 540 or 1000 rpm PTO speed. Some PTO-driven implements are operated at other speeds; see the implement operator's manual.
4 As printed. Power Shift 5th and 6th at 1500 rpm (5.6 and 7.4 mph) are higher than at 1900 rpm (5.5 and 7.1 mph), and 6th matches 7th. Scaled from the other columns, 5th and 6th would be about 4.3 and 5.6 mph, so the figures may be shifted down one row in the manual. TODO: confirm against the scan.
The manual prints "Additonal" in the tire note; spelling normalised.
All specifications transcribed from the specifications pages of the John Deere 4020 operator's manual OM-R34410 (Issue L3), originally published by John Deere. John Deere reserved the right to change specifications and design without notice; verify against your tractor's serial number before ordering parts or setting clearances.

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Manual code: OM-R34410

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