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John Deere Unstyled D

John Deere Unstyled D tractor
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The John Deere Unstyled D is a standard-tread tractor produced from 1923 to 1953, known for having the longest production run of any John Deere model. It features a two-cylinder letter series engine with options of 7.6L or 8.2L displacement, liquid-cooled and all-fuel capable. The tractor was built in Waterloo, Iowa, USA, with a total production of 160,000 units. It originally came with a 2-speed unsynchronized gear transmission, later upgraded to a 3-speed in 1935. The D model offers a drawbar power of 15 hp claimed and 29.9 hp tested, and belt power of 27 hp claimed and 41.59 hp tested. It has a manual steering two-wheel drive configuration with an open operator station. The tractor's dimensions and tires varied over the years, with weight ranging from 4090 to 5880 pounds and multiple tire size options. The rear PTO was optional with a type 525. The D model is a classic and durable tractor with a rich history in farming.
John Deere DJohn Deere Unstyled Dtractor specs2-cylinder tractorstandard-tread tractorJohn Deere tractor historytractor enginetractor transmissiontractor dimensions
Power-
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ModelD

Technical Specifications

Detailed specifications and technical data for John Deere Unstyled D

Power

Plows:3 (14-inch)
Belt (tested):41.59 hp (31.0 kW)
Belt (claimed):27 hp (20.1 kW)
Drawbar (tested):29.90 hp (22.3 kW)
Drawbar (claimed):15 hp (11.2 kW)

Engine

Aux. fuel:2.5 gal (early) (9.5 L), 1.5 gal (after 1931) (5.7 L)
Fuel tank:18 gal (early) (68.1 L), 23.5 gal (after 1931) (88.9 L)
Introduced:1927
Used until:1927, S/N 53388
Rated RPM 1:800
Rated RPM 2:900
Oil capacity:13 qts (12.3 L)
Bore/Stroke 1:6.50x7.00 inches (165 x 178 mm)
Bore/Stroke 2:6.75x7.00 inches (171 x 178 mm)
Compression 1:3.91:1
Compression 2:3.91:1
Displacement 1:465 ci (7.6 L)
Displacement 2:501 ci (8.2 L)
Engine options:John Deere 7.6L 2-cyl all fuel, John Deere 8.2L 2-cyl all fuel
Firing order 1:1-2
Firing order 2:1-2
Engine detail 1:John Deere all fuel 2-cylinder liquid-cooled
Engine detail 2:John Deere all fuel 2-cylinder liquid-cooled
Coolant capacity 1:52 qts (49.2 L)
Coolant capacity 2:52 qts (early) (49.2 L), 56 qts (after 1931) (53.0 L)

Overview

Type:Standard-tread tractor
Notes:The D had the longest run of any model of John Deere tractor, the styled and unstyled versions ran from March 1, 1923 until July 3, 1953. Serial numbers 31321 through 31412 are not model Ds, but are Waterloo Boy Ns which were built after model D production had begun.
Series:Two-Cylinder Letter Series
Built in:Waterloo, Iowa, USA
Total built:160,000
Original price:$1,000 in 1924
Production years:1923 - 1953

Mechanical

Drive:Two-wheel drive
Steering:Manual steering
Operator station:Open operator station with steel pan seat

Belt Pulley

RPM:900
Speed:3122 ft/min (951.59 meters/min)
Width:8.5 inches (21 cm)
Diameter:13.25 inches (33 cm)

Transmission

Notes:Original transmission used from 1923 to 1935; three-speed transmission introduced in 1935
Type 1923-1935:unsynchronized gear
Gears 1923-1935:2 forward and 1 reverse
Type after 1935:unsynchronized gear
Gears after 1935:3 forward and 1 reverse
Transmission options:2-speed unsynchronized gear, 3-speed unsynchronized gear

Serial Numbers

1924:30401 (model years)
1925:31280
1926:35309
1927:43410
1928:53388
1929:71645
1930:95367
1931:109944
1932:115509
1933:115665
1934:116273
1935:119100
1936:125079
1937:130700
1938:138413
1939:142300
Final:143799
Serial number plate location:On the tractor's operator platform, ahead of seat mount

Dimensions & Tires

Width:56 inches (142 cm), 66.5 inches (168 cm)
Length:109 inches (prior to 1930) (276 cm), 130 inches (after 1930) (330 cm)
Weight:4090 to 5880 pounds
Rear tire:46x12
Front tire:28x5
Hood height:56 inches (prior to 1930) (142 cm), 58 inches (1930 to 1934) (147 cm), 61.25 inches (after 1934) (155 cm)
Weight late:5880 lbs (2667 kg)
Weight early:4090 lbs (1855 kg)
Ag rear tires:46x12 (steel), 12.75x28
Ag front tires:28x5 (steel), 28x6 (steel), 7.50x18

Power Take-off (PTO)

Rear PTO:optional
Rear PTO Type:525