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McCormick-Deering 15-30 1923.jpg
McCormick-Deering 15-30, restored 1924-26 model (fitted with Pomona Vortox model 118 oil-bath air-cleaner, 1924-26) on display at Heidrick Ag History Center, Woodland, California
Model history
Model introduced 1921
Model discontinued 1928 (continued production as 'The New 15-30' 22-36 until 1934)
Model status Discontinued
No. produced 157,366
Preceded by International 15-30 Gear Drive
Superseded by The W-40 range (McCormick-Deering WA-40, McCormick-Deering WK-40 & McCormick-Deering WD-40)
Engine Specification
Engine make International
Engine model Unknown
Fuel type kerosene
Power hp 32.86 belt, 15.35 drawbar with 34.9 belt, 26.7 drawbar maximum (1922 test) - 36.15 belt, 22.78 drawbar and 40.7 belt, 30.1 drawbar maximum (1929 test)
Governed rpm 1,000 (1921-28) and 1,050 (from 1929)
Displacement cu in /(litre) 382 ci
No. of Cylinders 4
Bore in (mm) 114.30 (4.5 in)
Stroke in (mm) 152.40 (6 in)
Cooling system Water
Transmission Details
Transmission type Sliding gear
Clutch 'Spider' multi-plate type
Gearbox make International
Forward 3
Reverse 1
Drive 2-WD
General Data
Fuel capacity: 19 gal (86.37 L), Aux. fuel: 3/4 gal (3.4 L)
Linkage Category Unknown
Tyre Sizes (std/options)
Front Steel 34" (diameter) x 6" (face), 52" (tread)
Rear Steel 50" (diameter) x 12" (face), 53" (tread)
Tractor Dimensions
Length (inches/metres) 137 in
Width (inches/meters) 65 in
Height (inches/meters) (steering wheel) 70 in, (radiator) 64 in and (high air-cleaner intake pipe) 96 in
Weight (nominal) lb/kg 5,850 lbs (1921-28), 6,540 lbs (1929-34)
Turning circle (nominal) inches/meters 16 1/2 ft
Wheelbase 85 in
Other info
Factories Milwaukee Works, Milwaukee, Wisconsin, USA
Plow rating 3 (4 in 1929)
Nebraska Tests No. 87
Approximate Cost new in (year) $1250 (1923), $1350 (1929) and $1050 (from 1930)
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The McCormick-Deering 15-30 was built by International Harvester from 1921 to 1934 in the Milwaukee Works factory.

Model History

For Company history see
Main article: International Harvester

In 1922 the revolutionary 3-plow International 15-30 Gear Drive was a renamed the McCormick-Deering 15-30. In early 1923 it was International Harvester’s only tractor model as the 2-plow International 8-16, 3-plow Titan 10-20, and 4-plow International 15-30 chain drive became discontinued. The McCormick-Deering 10-20 Gear Drive wasn't out until later on in 1923. In export markets the tractor continued to be badged as an International, or as Deering, or McCormick. Throughout the production run the nickname 15-30 became ever popular and commonly known with farmers across most regions, especially throughout the States and Canada.

In 1929 the 15-30 engine was given a ¼" larger bore, increasing displacement to 425.3ci, and higher rpm, 1,050, to increase the power output to 40.7 belt and 30.1 drawbar. In export markets the revised model was usually called the 22-36 and it is frequently referred to as that in such regions as Britain. Although in the US the model and serial number plate continued under the name 15-30, for exports a different type of serial number plate was applied and stamped as 22-36. Instead of the usual "15-30 TRACTOR NO." , these plates used a basic "MODEL" and alongside it "SERIAL NO."  and stamping boxes underneath each. As from 1929, the model printed in these stamping boxes became 22-36.


  • 1921: International 15-30 introduced
  • 1922: Tractor renamed McCormick-Deering 15-30
  • 1929: Engine size & performance increased, model changed to 22-36 for export markets (see McCormick-Deering 22-36)

Modification Timeline

  • 1921-23: The early models had early front wheel hubs which were small and star-shaped (like previous IHC models) and back wheels which clamped onto the axle spline shafts with angle lugs/blades. 1921 models had star-shaped rear hubs that were changed to circle-shaped in 1922. Spade lugs would probably have been an optional difference in 1923. They also had short fenders/mudguards on both sides. The petrol tank was located inside the kerosene tank and was divided inside with two tank caps on the top. The tank caps were slightly star-shaped and taller than the later models aswell. They used a multi-plate 3 spring clutch. An early manifold design was used with an Ensign model "JTW" 1 1/2" carburettor that had the choke butterfly between the carb and air-cleaner instead of inside the carb itself;- the exhaust elbow came out of the left side (from the driving position) lower small engine side-panel/curtain in the bottom-right corner just before the side-panel/curtain corner. Short side-panels/curtains were fitted with short louver vents and short bolted on side-panels/curtains (the exhaust elbow stuck out of the left one). They had a round governor housing face with a cylinder shaped top that the lid screwed onto which was longer than the later models. A tin work panel with D-beading was used on the top right side of the engine for access to the push rods. A 'pot like' water-bath air cleaner was fitted (the first variation air cleaner). During half way through 1923 the 'pot-like' water-bath air cleaner changed to an oil-bath air cleaner (the middle variation air cleaner). They were thought to have a Dixie magneto with a splitdorf impulse (of the manually engaged latch type) for the first few years. These early models had different transmission and gearbox unit designs than the later models (they were being chang every few years, or even annually), the gearstick included a round spherical ball-joint where the stick sat into the platform; with a gromit ("boot", which was probably leather) to cover it aswell as a spherical knob on the top (this was used until mid 1927). The first break design was similar to the later ones but didn't have a flat row of teeth cast onto the break-band bracket for the lever; instead it was an ark of teeth bolted onto this bracket. The break lever included a little "handle" lever at the top with a linkage going to the pawl on these early models and carried on until mid 1924. It seems that at least the 1921 models had a different water-inlet pipe design than the later models. This water-inlet pipe had no three-hole flange, but a bolt or stud that went through the engine-end of the pipe by the elbow into the engine block itself. During some time at least in 1921 the original International imports had cast-in International names on the radiator instead of a brass name plate.
  • 1924-25: The big side-panels/curtains were lengthened and the little bolted on side-panels/curtains were discarded, but the louver vents were still short. The exhaust elbow poked out of the bottom-right corner of the side-panel/curtain just before the tin work corner. During mid 1924 the first variation of the break assembly was changed to the second and last variation break assembly. In later half of 1924 the cylider-shaped petrol tank was introduced to probably make the tanks cheaper to replace. During some part of 1923-24 the Dixie magneto was changed to the IHC E4A magneto but still with a splitdorf impulse.
  • 1926: The front wheel hubs were modified, made bigger into circle shapes like the back rear hubs, and these wheels changed to nut-tightened ones.
  • 1927: Larger louver vents for the side-panels/curtains were introduced. The exhaust manifold changed to the middle variation version where the exhaust elbow extended through the dash/bulk head with a pot exhaust elbow bolted onto the dash/bulkhead coming out by the by the air cleaner. This was to prevent overheating. IHC must have bought Ensign, or just had their name added to the carburettor, which was slightly modified (one notable thing is the relocation of the choke butterfly which was now built into the carb itself ). The left side fender/mudguard was lengthened down to the bottom of the air cleaner on the front end. The engine push rod D-beading tin work panel was discarded and the engine side was casted instead. The governor housing on right side got a flatter and more verticle side face. Spade lugs probably changed to the standerd wheel lugs and angle lugs/blades became an optional difference.
  • 1928: More accessories could be bought extra, like a purOlator oil filter to go on the engine side of the dash/bulkhead on the right; and a more effective single-plate compact "self-compensating" clutch and thinner-solid flywheel assembly to replace the older and less effective multi-plate clutch and wider-hollow flywheel assembly.
  • 1929: Piston bore was widened to 4 3/4" (4.75inches ) bore from 4 1/2" (4.50inches). The combination exhaust manifold was introduced, with a two hole carb fitting area;- so the carburettor base fitting was changed from a 3-hole to a 2-hole. PurOlators and the new flywheel and clutch assembly were perminently added, with the purOlator now bolted onto a fixing plate which was attached onto the right side of the engine block. The first variation of the water-pump was fitted; this had one inlet for hot water to come out of the cylinder head and one water oulet to flow water from the cylinder head back into the engine with the radiator water. New V-belt pullies were added for better grip, instead of flat belts and pullies. The top pulley and fan assembly joined onto the water-pump, which was joined onto the front of the cylinder head; instead of the fan and pulley being mounted onto the timing-case. The cylinder head was given a little more height and the spark plug hole ends were widened, which meant longer push rods and valves aswell. The oil pump had to have an extra oil pipe leading of it to go to the purOlator which also had a relief valve fitted to regulate the oil pressure; so the pump also changed slightly. The three-hole triangle-like flange located behind the pulley around the bearing housing on the one side of the pulley housing was changed to a square shaped four-hole flange; and on the over side the opposite bearing housing was changed from a circle shape to another square shape. The pulley/pto clutch lever on the side of the transmission and gearbox unit was scrapped and a new bent-gearstick-like lever was designed to go on top of the transmission and gearbox unit behind the tank support on the driver's side. One of the transmission and gearbox unit re-design changes happened this year. The bell/flywheel housing had a bit of a change with the cast-webbing on the flywheel-side; and a little window hole was cast-in on the right-side that had a little sheet-metal cover with a two-hole bolt fixing to see the markings on the back of the flywheel like TDC (top dead centre/er). Another thing to be changed was the govenor housing, as the lubrication fitting was normally angled downward because there previously was no oil filter; this changed to pointing upwards so a pipe could come across from the purOlator oil filter and down into the governor housing. Because of the new style of exhaust manifold, the carburettor stuck out a few more centimetres; this is why a rectanglular stepped area was put onto the left-side engine side-panel/curtain as room for the carb. The pot exhaust elbow on the dash/bulkhead was discarded and the elbow now came back out of the engine side-panel/curtain in the same place as before, this time the tin work corner was left off for easier lifting of the manifold's side side-panel. In 1929 there were two variations of the 22-36 or 'New 15-30', these were the early-year and the late-year 1929 22-36's or 'New 15-30's'. The early-year 1929 tractor had a different set of water-cooling pipes than the late-year one, but the same system and arrangement. The difference was that the earlier one had a narrower engine water-inlet pipe than the later tractor. The later one had pipes of the same thickness as the normal 15-30; but on the radiator pipe there was an extra pipe veeing off upto the water pump and on the engine water-inlet pipe there was a brass butterfly valve. This valve helped to warm up the engine on a cold day by controlling the amount of water going into the engine. Both 1929 models had a thin variation water manifold instead of the more normal big 15-30 water manifold.
  • 1930's: The late-1929 version water-cooling pipes were discarded. The water-cooling system changed to a different arrangement that the radiator pipe was just one pipe now that went straight to the water-pump; and the engine water-inlet pipe headed diagonally up towards the pump but joined to another pipe leading from a new design water manifold via a Y-pipe before joining to the pump. The new design water manifold was another big manifold with a verticle flat side on the left side of the engine and with a plate that was bolted on, containing a bellows style thermostat filled with wax. The wax would warm up when the engine got hot and at the right temperature the wax would expand the bellows thus opening a valve, to allow a flow of hot water to the water-pump from the cylinder head; through the pipe joined to the engine water-inlet pipe. These pipes direct water in and out of the pump and engine. The engine water-inlet pipe also had a drain cock on the outside mounted to the end of the pipe that was joined to the engine. The transmission and gearbox unit was changed again. The over last modification was a change in the oil-bath air cleaner (the third air cleaner variation). The air cleaner pipe that joined to the dash/bulkhead and the top of the air cleaner tank was an all-in-one cast part; where the pipe joined onto the back of the tank top. This allowed the air cleaner end pipe and strainer to be fitted to the top of the tank, instead of coming off of the side of the tank and the dash/bulkhead pipe fitted to the top of the tank of which was the previous design (middle variation). During some point in the 1930's (preferably just after 1929) the splitdorf on the E4A was changed to an automatic impulse. Also during some point around 1932-33 the magneto changed to the International F-4 with automatic drum-type impulse of International's own design.
  • It is known that up until 1926 at least, the 15-30's had ball and roller bearings at 28-29 points. It is stated in an original 1922 advert of mine "Ball and Roller Bearings at 29 Points", but in my 1924 and 1926 adverts they say "ball and roller bearings at 28 points." I'm not sure if this is wrong somewhere along the lines (more times out of any it's 28 points, so I think it's 28). From 1928 and up the original literature I have states "ball and roller bearing at 34 points" and "Today, these tractors are equipped with 34 ball and roller bearings'." Out of all of my adverts that brag about the 15-30, the best one for the bearings is a 1930 one that states "Ball and roller bearings at 34 points add to easy running and long life."
  • After purchasing an original 1936 15-30 TC-5-B (the last book which preceedes TC-5-A) parts book/manual that covers all of the 22-36 parts for every year variation, I have found out that there were so many different parts for "special" versions and at least two or three "special" parts packages for these tractors. For instance people could probably have had a Dixie model 46-C or a Robert Bosch type ZU-4, FU-4, FU-4-A, FU-4-AR-S60 with couplings C-125, C-125A or C-225; instead of an E4A or an Inductor type F-4 magneto (or vice versa). Also aswell, there is a "special" exhaust manifold diagram not named and without any part No. in the book on the last variation 1930's type cooling. The carburettor is mounted higher up on this a lot more differently arranged Exhaust manifold. Another interesting thing is that throughout the whole production period from 1929-34 the 15-30's had five variations of the complete fan and water pump assembly. There were two types of fan and water pump originally in 1929 (11683-D, DA) and three in 1930 (11683-DA, DB and DC); pump 11683-DC was able to replace its predecessor pumps (D, DA and DB) on the earlier tractors and was used until half way through 1930. There's no pump shown for 1931. A fifth fan and pump assembly model 21247-DX was introduced at the beginning of production in 1932 until probably the end in 1934. <Information yet to be modified and refined>

This information is for referential use ONLY; a guide to follow, such as for assistance of approximate year dating where dates cannot be obtained. This information is partly derived from original International Harvester Company literature and also from in-depth research and experience, therefore should not be edited any further by other/external sources. The content and information provided in this section is subject to copyright; the use of, re-transmission, or republication of the content given above, in any form, without copyright holder's consent, is a violation of copyright law and act of copyright infringement. Copyright© and supplied by IHC_15-30_Enthusiast.

Factory locations

  • International Harvester Milwaukee Works, Milwaukee, Wisconsin


See Infobox for basic details

Variations and Options

  • Pneumatic rubber tires available from about 1933: 7.50-16 or 7.50-18 front and 12.75-28 or 13.50-24 rear
  • Rice field equipment: Special wheels
  • Orchard equipment: Smaller diameter wheels, lower air intake screen, lower steering wheel
  • California orchard model: Includes standard orchard options including enclosed rear fenders
  • Industrial model (I-30): Solid industrial rims with solid rubber tires or pneumatics, industrial seat, varying options (see McCormick-Deering 30 Industrial)

Serial Numbers Information

Year Serial run[1] Number Built[2] Notes (Total built 157,366).
1921 TG112-310 199 [111 prototype/pre-production tractors produced] Rare
1922 TG311-1660 1,350
1923 TG1661-6546 4,886
1924 TG6547-13867 7,321
1925 TG13868-26845 12,978
1926 TG26846-48646 21,801
1927 TG48647-64400 15,754
1928 TG64401-99925 35,525 Total 15-30's built: 99,814
1929 TG99926-128236 28,311 Use of the letter ‘M’ from 1929 onwards, throughout 22-36 run
1930 TG128237-150127 21,891
1931 TG150128-154507 4,380
1932 TG154508-156212 1,705 Letters ‘MB’ denotes use of ball-bearing transmission (1932 onwards)
1933 156213-156300 88 Rare-Thought to be none as no evidential records, rise in number suggests probabilities of production or prototypes
1934 TG156301-157477 1,177 Total 22-36's built: 57,552


The Heidrick Ag History Center, Woodland, California has on display a restored McCormick-Deering 15-30 from 1923, along with a 10-20 and various crawlers.

List of Preserved McCormick-Deering 15-30 tractors
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Make + Model No.
Reg No.
(if known)
Serial No. Build-Date Engine-Type/Make Owner
(if known)
Photo Were seen/Featured in Other info


Please add any tractor with known reg or serial no. with Photo if possible.
Create a page (link) for an individual tractor by linking the reg or serial number using reg number or serial number in the relevant column. Then once saved click the red link to start the new page and add info on that tractor.

A 1923 McCormick-Deering 10-20 and 15-30 advert with a nice 15-30 doing belt work. IHC used this 15-30 image for quite a few of their 15-30 ads.

A 1923 McCormick-Deering 15-30 advert.


Add extra photos here please.

See also

Collection related info
  • Shows and Meets - events featuring tractors and other machinery
  • Clubs Listing - List of clubs including various tractor marques
  • Collections - list of private collections with tractors (add yours)
  • Museums - includes museums featuring tractors (please add missing ones)

Heidrick Ag History Center, Woodland, California

References / Sources

  1. Wendel, C. H. 1981. 150 Years of International Harvester, Crestline Publishing Co., Sarasota, Florida. (serial numbers p.411)
  2. Klancher, Lee 1996. International Harvester Photographic History, Motorbooks International, Osceola, Wisconsin, p.34

External Links