Hart-Parr Tractor Serial Numbers
Models & Specifications
1901 Thru 1937

*Note: These Hart-Parr Tractors are listed by their tractor
series number, numerical order, not by the year they
were built.

12-24 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 12-24 Standard 26 hp	1924	(E) 36001 - 36074	73
Plant: Charles City, Iowa	1925	(E) 36075 - 36580	505
Hart-Parr 5.1L 2 Cylinder Gasoline	1926	(E) 36581 - 37100	519
Hart-Parr 5.5L 2 Cylinder Gasoline	1926	(G) 37101 - 37189	88
Gears: 2 Forward and 1 Reverse	1927	(G) 37190 - 37900	710
Drawbar (Tested): 17.54 hp	1927	(H) 37901 - 38118	217
Belt (Tested): 26.97 hp	1928	(H) 38119 - 39686	1,567
Weight: 4,440 lbs	1929	(H) 39687 - 42278	2,591
Original Price: $1050 (1930)	1930	(H) 42279 - 43253	974
Total Units Built:   6,725 (Est)

15-22 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr (15-22) Standard 22 hp	1914	6219 - 6244	25
Plant: Charles City, Iowa	1915	6245 - 6743	498
Hart-Parr 5.5L 2 Cylinder Kerosene	1916	6744 - 6943	199
Gears: 2 Forward and 1 Reverse
Drawbar (Claimed): 15 hp
Belt (Claimed): 22 hp
Weight: 6,647 lbs
Tractor Known As The "Little Devil"
Original Price: $1390 (1914)
Total Units Built:  722 (Est)

15-30 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr (15-30) Standard 33 hp	1918	8401 - 9382	981
Plant: Charles City, Iowa	1919	9383 - 11499	2,116
Hart-Parr 7.6L 2 Cylinder Gasoline
Gears: 2 Forward and 1 Reverse
Drawbar (Claimed): 15 hp
Belt (Claimed): 30 hp
Weight: 5,158 lbs
3 Plows
Tractor Known As The "Little Gray Tractor"
Mfg. Tractor Name: "New Hart-Parr"
Total Units Built:  3,097 (Est)

16-30 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 16-30 Standard 33 hp	1924	(E) 22501 - 22600	99
Plant: Charles City, Iowa	1925	(E) 22601 - 24000	1,399
Hart-Parr 7.6L 2 Cylinder Gasoline	1926	(F) 24001 - 26000	1,999
Gears: 2 Forward and 1 Reverse
Drawbar (Tested): 24 hp
Belt (Tested): 37 hp
Weight: 5,450 lbs
Original Price: $1350 (1926)
Total Units Built:   3,497 (Est)

17-30 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 17-30 Standard 33 hp	1901	Described as No. 1	1 (?)
Plant: Charles City, Iowa	1902	Described as No. 1	1 (?)
Hart-Parr 27.1L 2 Cylinder Gasoline	1902	Described as No. 2	1 (?)
(Above Estimated)	1903	1206 - 1219	13
Drawbar (Claimed): 17 hp	1904	1339 - 1340	1
Belt (Claimed): 30 hp	1905	1346 - 1349	3
	1905	1420 - 1422	2
*First "Traction Engine" Hart-Parr Produced	1906	1435 - 1444	9
	1906	1446 - 1454	8
Total Units Built:   39 (Est) ? ? ?

18-27 Series

Model	Year	Serial #	Units
Mfg: Oliver/Hart-Parr 18-27 R.C. 22 hp	1930	(S) 100001 - 102648	2,647
Plant: Charles City, Iowa	1931	102649 - 103300	651
Oliver 4.6L 4 Cylinder Kerosene
Gears: 3 Forward and 1 Reverse	1031	(D) 103301 - 103318	17
Drawbar (Tested): 18.10 hp	1932	103319 - 103617	298
Belt (Tested): 29.72 hp	1933	103618 - 104038	420
Weight: 3,500 lbs	1934	104039 - 104850	811
	1935	104851 - 107311	2,460
*1930-31 Single (S) & *1931-37 Duel (D) FT. Wheels	1936	107312 - 108573	1,261
1st Row Crop Tractor Ever Produced	1937	108574 - 109151	577
Total Units Built:   9,142 (Est)

18-28 Series

Model	Year	Serial #	Units
Mfg: Oliver/Hart-Parr 18-28 Sandard 22 hp	1930	800001 - 800459	458
Plant: Charles City, Iowa	1931	800460 - 800963	503
Oliver 4.6L 4 Cylinder Kerosene	1932	800964 - 800984	20
Gears: 3 Forward and 1 Reverse	1933	800985 - 801050	65
Drawbar (Tested): 18.10 hp	1934	801051 - 801240	189
Belt (Tested): 29.72 hp	1935	801241 - 801989	748
Weight: 4,000 lbs	1936	801990 - 802937	947
	1937	802938 - 803928	990
Total Units Built:   3,920 (Est)

18-36 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 18-36 Standard 40 hp	1926	(G) 26001 - 26361	360
Plant: Charles City, Iowa	1927	(G) 26362 - 28850	2,488
Hart-Parr 8.2L 2 Cylinder Gasoline	1927	(H) 28851 - 29635	784
Gears: 2 Forward and 1 Reverse	1928	(H) 29636 - 33752	4,116
Drawbar (Tested): 32.2 hp	1928	(I) 33753 - 34566	813
Belt (Tested): 42.85 hp	1929	(I) 34567 - 35000	433
Weight: 6,100 lbs	1929	(I) 85001 - 89159	4,158
Original Price: $1350 (1930)	1930	(I) 89160 - 90698	1,538
Export: New Zealand & Australia special use
Total Units Built:   14,690 (Est)

20 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 20 (10-20) Standard 22 hp	1920	(B) 35001 - 35024	23
Plant: Charles City, Iowa	1921	(B) 35025 - 35199	174
Hart-Parr 4.6L 2 Cylinder Gasoline	1922	(B) 35200 - 35319	119
Gears: 2 Forward and 1 Reverse	1922	(C) 35501 - 35521	20
Drawbar (Tested): 14 hp	1923	(C) 35522 - 35749	227
Belt (Tested): 23 hp	1924	(C) 35750 - 35922	172
Weight: 4,440 lbs
Original Price: $1,195 (1924)
Total Units Built:   735 (Est)

20-40 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 20-40 Standard 44 hp	1911	4111 - 4212	1
Plant: Charles City, Iowa	1912	4713 - 4736	23
Hart-Parr 2 Cylinder Kerosene	1913	4737 - 4793	56
Drawbar (Claimed): 20 hp	1914	4794 - 4813	19
Belt (Claimed): 40 hp
Total Units Built:   99 (Est)

22-45 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 22-45 Standard 50 hp	1908	1811 - 2014	3
Plant: Charles City, Iowa	1909	2025 - 2324	299
Hart-Parr 2 Cylinder Kerosene	1910	2432 - 3310	878
Drawbar (Claimed): 22 hp	1911	3311 - 3811	500
Belt (Claimed): 45 hp
Total Units Built:   1,676 (Est)

28-44 Series

Model	Year	Serial #	Units
Mfg: Oliver/Hart-Parr 28-44 STD 48 hp	1930	500001 - 503599	3,598
Plant: Charles City, Iowa	1931	503600 - 506184	2,584
Hart-Parr 7.4L 4 Cylinder Kerosene	1932	506185 - 506211	26
Gears: 3 Forward and 1 Reverse	1933	506212 - 506254	42
1936 - 1937 High Compression	1934	506255 - 506400	145
Drawbar (Tested): 34.21 hp	1935	506401 - 507175	774
Belt (Tested): 49.04 hp	1936	507176 - 508015	839
Weight: 6,415 lbs	1937	508016 - 508917	901
Total Units Built:   8,909 (Est)

28-50 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 28-50 Standard 55 hp	1927	70501 - 70741	240
Plant: Charles City, Iowa	1928	70742 - 70951	209
Hart-Parr 11.1L 4 Cylinder Gasoline	1928	70952 - 70967	115
Gears: 2 Forward and 1 Reverse	1929	70968 - 71401	433
1927 - 1928 Narrow Radiator	1930	71402 - 71701	299
1928 - 1930 Wide Radiator
Drawbar (Tested): 46 hp
Belt (Tested): 64 hp
Weight: 8,600 lbs
Original Price: $2085 (1930)
Total Units Built:   1,386 (Est)

1915 Hart-Parr 30-60, 20,100 lbs, "Old Reliable" Tractor

30-60 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 30-60 Standard 60 hp	1911	3812 - 4111	299
Plant: Charles City, Iowa	1911	4212 - 4300	88
Hart-Parr 38.6L 2 Cylinder Kerosene & Gasoline	1912	4301 - 4711	410
Gears: 1 Forward and 1 Reverse	1912	4814 - 4913	99
Drawbar (Claimed): 30 hp	1913	4916 - 5415	499
Belt (Claimed): 60 hp	1914	5416 - 5480	64
Weight: 20,100 lbs	1915	5481 - 5674	193
Tractor Known As "Old Reliable"	1916	5675 - 5715	40
Total Units Built:  1,692 (Est)

30 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 30 (15-30) Standard 33 hp	1918	(A) 8401 - 9232	831
Plant: Charles City, Iowa	1919	(A) 9383 - 13017	3,634
Hart-Parr 7.6L 2 Cylinder Gasoline	1920	(A) 13018 - 14198	1,180
Gears: 2 Forward and 1 Reverse	1920	(A) 15550 - 18474	2,924
	1921	(A) 18475 - 18841	366
Drawbar (Tested): 19 hp	1922	(A) 18842 - 19125	283
Belt (Tested): 31 hp	1922	(C) 21001 - 21392	391
Weight: 5,570 lbs	1923	(C) 21393 - 21864	471
Original Price: $1,395 (1924)	1924	(C)21865 - 22300	435
Total Units Built:  10,515 (Est)

40 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 40 (22-40) Standard 44 hp	1923	70001 - 70019	18
Plant: Charles City, Iowa	1924	70020 - 70094	74
Hart-Parr 10.1L 4 Cylinder Gasoline	1925	70095 - 70250	155
Gears: 2 Forward and 1 Reverse	1926	70251 - 70490	239
	1927	70491 - 70500	9
Drawbar (Tested): 28.23 hp
Belt (Tested): 46.40 hp
Weight: 7,500 lbs
Original Price: $2,250 (1927)
Total Units Built:  495 (Est)

40-80 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 40-80 Standard 110 hp	1908	2015 - 2018	3
Plant: Charles City, Iowa	1909	2019 - 2024	5
Hart-Parr 54.2L 4 Cylinder Kerosene
Drawbar (Claimed): 40 hp
Belt (Claimed): 80 hp
Weight: 34,000 lbs
Total Units Built:  8 (Est)

60-100 Series

Model	Year	Serial #	Units
Mfg: Hart-Parr 60-100 Standard 111 hp	1911	4000	1
Plant: Charles City, Iowa	1912	4101	1
Hart-Parr 4 Cylinder (Vertical)
Drawbar (Claimed): 60 hp
Belt (Claimed): 100 hp
Weight: 52,000 lbs
Largest Tractor Ever Built For Its Time
No Production Runs - None Known To Exist
Total Units Built:  2 (Est)

1908 30-60 Hart-Parr Oil Pull "Old Reliable"



The Hart-Parr Factory, Charles City, Iowa

Charles Hart and Charles Parr were credited for
being the first successful mass production
gasoline traction engine company.

Hart-Parr built the 1st Row Crop tractor in 1930.

They are also credited with introducing the word
"Tractor" to the English language.

Charles Walter Hart and Charles H. Parr met at the Univ. of Wisconsin and became very close friends. Close to the end of their college career they decided to work cooperatively on a thesis that brought about the development of their first engine. Their thesis dealt with the limitations of early internal combustion engines and Hart-Parr developed an engine that eliminated those limitations (or most of them). They were so successful in their ideas that the Hart-Parr company was organized in Madison, Wisconsin on April 29, 1897. Until 1901 they operated their engine factory, perfected their valve-in-head engine design, as well as a cooling system employing oil as the cooling medium. They continued building superior engines until they needed larger facilities and because they lacked the capital to build, Hart's father financed the factory if they moved to Charles City, Iowa. The Hart-Parr Company was organized on June 12, 1901 at Charles City. Ground was broken for a new factory July 5th of the same year. Their development of steam and gas powered tractors caused the company to grow very rapidly. By 1911 the Hart-Parr Company employed 1,100 people and tractor production was growing every year. By 1915 the company was capitalized at $2.5 million. The 1929 merger of Hart-Parr into the Oliver Farm Equipment Company brought about the Oliver Hart-Parr "Row Crop" tractor, an entirely new model with a unit frame design and vertical engine.

Oliver Hart-Parr
18-27 Row Crop Tractors
1930 - 1937

1930 Hart-Parr 18-27, 1st Row Crop Tractor Produced

This new Oliver Hart-Parr 18-27 Row Crop, Olivers first general-purpose tractor, went into production in February of 1930, it was the first model of three to be introduced in 1930. Later in 1930, Oliver Hart-Parr introduced two more standard tractors, the Model 18-28 and the Model 28-44. The 18-28 and the Row Crop remained in production until 1937 when the 28-44 was transformed into the Model 90 tractor, which remained in production until 1952. The front steel wheel was of unique design being of concave shape. This single front wheel combined with the fact that this tractor had no turning brakes, provided a challenge turning in loose soil with an implement in tow. Then late in 1930 at approximately s/n 102130, turning brakes were added to the rear axle. Many early Row Crops were field equiped with these add on turning brakes, which helped a great deal for turning. In 1931 the dual front wheel Row Crop appeared and these tractors featured differential shaft brakes to assist in turning. The engine in the Row Crop tractor was a valve-in-head de- sign, 4 cylinder built by Waukesha. Actually, the engine blocks cast HART-PARR into them, were built in the Charles City plant and the heads were made in Milwaukee, Wisconsin and then the blocks and heads were shipped to Waukesha for assembly and then back to Charles City, Iowa. With the coming of the Row Crop also came the introduction of the famous "Tip Toe Wheel". This proved to be a great for traction and usually there was no problem with this style of wheel. It was a simple idea with lugs bolted on either side of a band of 9/16 wide steel. With this style, compaction was to a bare minimum without sacrificing traction.

1930 Oliver Hart-Parr 18-27 1st Row Crop Ever Built

This tractors serial number is 100328 and was built built on April 7, 1930 in Charles City, Iowa. Notice "Tip Toe" steel wheels with a mud scraper behind the front wheel. Also the large Hart-Parr and small Oliver on front of the radiator. This picture shows the left side of the tractor with the cast iron air cleaner cover. This was a unique feature on the first 350 Row Crops built. This shows the cast iron air cleaner cover of which has disappeared from many of these early row crop tractors. The view also shows the choke wire position and the hood decal used on the first models. This is a 1935 Row Crop serial number 105340. It is basically the same as the single wheel models. Exceptions are the dual front wheels, the indi- vidual turning brakes, and an oil bath air cleaner. You will also notice the rear wheels have an extra reinforcing ring put half way between the hub & the outer band.

Oliver Hart-Parr Audio History Tour .mp3
        ( Floyd County Museum, Charles City, Iowa 3:47 mins )

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MORE HART-PARR TRACTOR INFO BELOW

All Hart-Parr Tractors Listed By Model
TractorData Hart-Parr Tractor Series Info Here

Hart-Parr Tractor Series Paint Codes
TTG Paint Codes Here

Many Misc. Tractor Parts Files .pdf
TTG Parts Files Etc. Here

⁕ 100 Years of University of Nebraska Tractor Tests
Farm Tractor Tests 1903 Thru 2009 Here

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Toplands & Double D Living History Farm 2015

1st Sunday In June Open House & Antique Tractor Show
( Admission Free )

Dudley Diebold's Toplands Farm
102 Painter Hill Road,
Roxbury, Ct.

Double D Living History Farm maintains the
largest collection of restored antique
tractors and farm equipment
in the Northeast.
View Toplands Farm & D & D's Living History Info

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*Note: Hart-Parr info is limited, if anyone has more accurate
info that can be added above, send me a email at
gtstoday@gmail.com Thanks, George

TTG Home Page Here


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