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Table of Contents

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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