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JD 2-Cyl Engine and HP Chart

Compiled by J.R. Hobbs
Model  Bore & Stroke  Cubic Inches  Serial # range  Fuel  Belt HP Drawbar HP
Waterloo Boy "R"  5 1/2 x 7 333 1026-1143 Kero 20 NA
Waterloo Boy "R" 6 x 7 395 1144-6727 Kero 24 N/A
Waterloo Boy "R"  6-1/2 x 7 465 6728-up Kero 24 N/A
Waterloo Boy "N"  6-1/2 x 7 465 All Kero 25.00 15.98
Model "D"  6-1/2 x 7 465 30400-53387 Kero 30.40 22.53
Model "D"  6-3/4 x 7 501 53388-109943 Dist. 36.98 28.53
Model "D"  6-3/4 x 7 501 109944-143799 Dist. 41.59 30.74
Model "D"  6-3/4 x 7 501 143800-191670 Dist. 42.05 38.02
Model "GP" *  5-3/4 x 6 312 200111-223802 Dist. 24.97 17.24
*includes Model "C" (pre-"GP) 200001-200110 and "P" (potato) tractors 5000-5202 . . . . . .
Model "GPWT"  5-3/4 x 6 312 400000-4002039 Dist 24.97 17.24
Model "GP" series**  6 x 6 339 223803-230745 Dist. 25.36 18.86
** Includes "GPO" Orchard and Grove tractors 15000-15732 . . . . . .
Model "GPWT"  6 x 6 339 4002040-405254 Dist. 25.36 18.86
Model "A" series  5-1/2 x 6-1/2 309 410000-498535 Dist 24.71 18.72
Model "A" series  5-1/2 x 6-3/4 321 499000-583326 Dist. 29.59 26.20
Model "A" series  5-1/2 x 6-3/4 321 584000-703384 Gas 38.02 34.14
Models "AR/AO/AI"  5-1/2 x 6-1/2 309 250000-259335 Dist 24.71 18.72
Includes "AOS" 1000-1891 . . . . . .
Model "AR"/"AO"  5-1/2 x 6-3/4 321 260000-270679 Dist 30.33 26.52
Model "AR"/"AO"  5-1/2 x 6-3/4 321 272000-284074 Gas 39.1 34.9
Model "B" series* 4-1/4 x 5-1/4 149 1000-58246 Dist 16.01 11.84
*Includes "BR/BO/BI" 325000-328890 . . . . . .
Model "B" series*  4-1/2 x 5-1/2 175 60000-95201 Dist 18.53 16.44
Includes "BR/BO/BI" 329000-337514 . . . . . .
Model "B" series 4-1/2 x 5-1/2 175 96000-200247 Dist 20.52 19.26
Model "B" series  4-11/16 x 5-1/2 190 201000-310772 Gas 27.58 24.62
Model "B" series  4/11/16 x 5-1/2 190 201000-310772 Dist 23.53 21.14
Model "G" (unstyled)  6-1/8 x 7 413 1000-12192 Dist 35.91 27.63
Model "GM"  6-1/8 x 7 413 13000-22112 Dist 38.10 34.49
Model "G" (styled)  6-1/8 x 7 413 23000-64530 Dist 38.10 34.49
Model "H" series 3-9/16 x 5 100 1000-61116 Dist 14.84 12.48
Model "L" (unstyled) . . . . . .
Model "L" (styled)*  3-1/4 x 4 66 625000-642038 Gas 10.42 9.06
*Includes "LI" 50001-52019 . . . . . .
Model "LA"  3-1/2 x 4 77 1001-13475 Gas 14.34 13.10
Model "M" *  4 x 4 101 10001-55799 Gas 20.45 18.15
*Includes "MI" 10001-11032  . . . . . .
Model "MC"  4 x 4 101 10001-20509 Gas 22.2 18.3
Model "MT" 4 x 4 101 10001-40472 Gas 21.6 18.8
Model "R"  5-3/4 x 8 416 1000-22293 Diesel 51.06 45.7
Numbered series tractors . . . . . .
Model 40 series*  4 x 4 101 60000-up** Gas 25.2 22.9
Model 40 series* 4 x 4 101 60000-up** Dist 20.9 19.0 4x4 101 60000-up** Dist 20.9 19.0
*Includes all wheel models and Crawler. . . . . . .
** Ending serial numbers differed for different models.  . . . . . .
Model 50  4-11/16 x 5-1/2 190 5000001-5033751 Gas 31.0 27.5
Model 50  4-11/16 x 5-1/2 190 5000001-5033751 Dist 25.8 23.2
Model 50  4-11/16 x 5-1/2 190 5024000-5033751 LP-Gas 32.3 29.2
Model 60  5-1/2 x 6-3/4 321 6000001-6064096 Gas 41.6 36.9
Model 60  .5-1/2 x 6-3/4 321 6000001-6064096  Dist. 33.3 30.1
Model 60  5-1/2 x 6-3/4 321 6026000-6064096 LP-Gas 42.2 38.1
Model 70  5-7/8 x 7 379 7000001-7043757 Gas 50.4 44.2
Model 70  6-1/8 x 7 413 7000001-7043757 Dist. 45.0 41.0
Model 70 5-7/8 x 7 379 7003000-7043757 LP-Gas 52.0 46.1
Model 70  6-1/8 x 6-3/8 376 7017500-7043757 Diesel 51.5 45.7
Model 80  6-1/8 x 8 471 8000001-8003500 Diesel 67.6 61.8
Model 320 *See Model 40 4 x 4 101 320001-325518  Gas * *
Model 320 *See Model 40 4 x 4 101 320001-325518 Dist. * *
Model 420 series  4-1/4 x 4 113 80000-136868 Gas 29.21 27.08
Model 420 series  4-1/4 x 4 113 80000-136868 Dist 23.47 21.89
Model 420 series 4-1/4 x 4 113 125000-136868 LP-Gas Not tested
Model 520  4-11/16 x 5-1/2 190 5200000-5213189 Gas 38.58 34.31
Model 520  4-11/16 x 5-1/2 190 5200000-5213189 Dist. 26.61 24.77
Model 520  4-11/16 x 5-1/2 190 5200000-5213189 LP-Gas 38.09 34.17
Model 620  5-1/2 x 6-3/8 302 6200000-6223247 Gas 48.68 44.16
Model 620  5-1/2 x 6-3/8 302 6200000-6223247 Dist. 35.68 32.66
Model 620  5-1/2 x 6-3/8 302 6200000-6223247 LP-Gas 50.34 45.78
Model 720  6 x 6-3/8 360 7200000-7229002 Gas 59.12 53.05
Model 720  6 x 6-3/8 360 7200000-7229002 Dist. 45.33 41.29
Model 720 6 x 6-3/8 360 7200000-7229002 LP-Gas 59.61 54.17
Model 720 6-1/8 x 6-3/8 376 7200000-7229002 Diesel 58.84 53.66
Model 820 (1957) 6-1/8 x 8 471 8200000-8203036 Diesel 67.6 61.8
Model 820 (1958)  6-1/8 x 8 471 8203100-8207080 Diesel 75.60 69.66
The 30 series tractors used the same engines as the 20 series tractors, and were not tested at Nebraska. For 30 Series engine displacements and horsepower ratings, see the equivalent 20 Series tractors above. 440 series tractors prior to 447999 used 420 engines, 840 tractors used 830 engines. See serial number page for 30 and 40 series serial numbers.

In 1959, due to the lack of demand for belt-driven machines, the belt hp test was discontinued, and maximum horsepower tests were now taken from the PTO. The following are the PTO and drawbar ratings for the late 440 and 435 tractors.
 
Model Bore & Stroke Cubic Inches Serial # range Fuel Belt HP Drawbar HP
Model 435 3-7/8 x 4-1/2 106 435001-439626 Diesel (GM 2-53) 32.91 28.41
Model 440  4-1/4 x 4 113 448000-463929 Gas 31.06 26.90
Model 440 3-7/8 x 4-1/2 106 448000-463929 Diesel (GM 2-53) 32.70 27.51


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