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Allis Chalmers D21 Tractor Parts

About the Allis-Chalmers D21

The D21 was introduced in 1963 as the largest tractor in the D Series. It used a large six-cylinder diesel, power steering, an independent 1,000-rpm PTO, and the size and weight needed for large field work.

The D21 was built from 1963 through 1969 in Series I and Series II versions. The serial number table shows the change from Series I to Series II during the 1965 production run.

Serial Number Reference

Serial number locations: The tractor serial number is stamped on the left side, on the front flange of the torque housing near the starter mounting. The engine serial number is stamped on a plate at the upper rear of the engine block on the left-hand side.

The table below shows the beginning tractor serial number for each Model D21 year and series:

 

1963-1965
Model D21 year Beginning serial number
1963 - Series I 100
1964 - Series I 1,417
1965 - Series I 2,079
1965-1967
Model D21 year Beginning serial number
1965 - Series II 2,130
1966 - Series II 2,408
1967 - Series II 2,863
1968-1969
Model D21 year Beginning serial number
1968 - Series II 3,777
1969 - Series II 4,498

Total production: 2,409 Model D21 tractors.

Allis-Chalmers D21 Paint Reference

For restoration planning, the Allis-Chalmers D21 is listed in the Allis-Chalmers tractor paint guide with the original paint references below.

Allis-Chalmers D21 paint reference by production period
Production period Metal Wheels Disc Chassis Trim
1961 through 1977 Persian Orange 2 Cream, Persian Orange 2 Cream, Aluminum Persian Orange 2 Cream, Chrome grille

Paint placement can vary by production year, series, and equipment configuration.

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  • Allis-Chalmers Bottom Seat Cushion for D10 D12 D14 D15 D17 D19 D21, black and white upholstered tractor seat cushion.

    Allis-Chalmers Bottom Seat Cushion for D10 D12 D14 D15 D17 D19 D21

    Allis-Chalmers
    $249.75
    AC-223D
    Restoration quality bottom seat cushion for select Allis-Chalmers tractors. Cushion is embossed like original and made in the USA.Part Number: AC-223DFitsD10D12D14D15D17D19D21170, 175, 180, 185, 190,...
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  • Allis-Chalmers Ignition Key Switch, metallic ignition switch with attached key for industrial machinery

    Allis Chalmers Ignition Key Switch

    Allis-Chalmers
    $39.75
    AC-288D
    Ignition key switch for select Allis Chalmers tractors and related applications.5 spade terminals with screws, .995" diameter threaded end, OEM style Delco Remy. Includes jam nut and 2 keys. 4...
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  • Allis-Chalmers Ignition Key Allis Chalmers Oliver Case 72162639

    Ignition Key for Allis-Chalmers, Oliver, Case 72162639

    Allis-Chalmers
    $5.25
    KY-01D
    Ignition key with brass finish for listed Allis-Chalmers, Oliver, Case, Cockshutt, IH, Farmall, and White models.Fits listed models using Delco switch.Part Number: KY-01DFitsAllis Chalmers: D10, D12,...
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  • Allis-Chalmers Ignition Switch 4 Position Key Switch

    4 Position Ignition Switch with 2 Keys

    Allis-Chalmers
    $19.75
    AB-400D
    4-position ignition switch for AG and light industrial equipment.Includes 2 keys.Part Number: AB-400DFitsAllis ChalmersAveryCaseCockshuttDavid BrownFordIH / FarmallJohn DeereMassey FergusonMassey...
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  • Allis-Chalmers Cork / Rubber Rollpack Gasket Material, cylindrical rolled gasket with cork and rubber composition for industrial sealing applications.

    Cork / Rubber Rollpack Gasket Material

    Allis-Chalmers
    $14.00
    AB-1830D
    Cork / Rubber Rollpack Gasket Material for making multi-purpose gaskets. USA made and sold as a 12" x 24" sheet.Part Number: AB-1830DFitsAllis ChalmersAveryCaseCockshuttFordIH / FarmallJohn...
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  • Allis-Chalmers Universal 2 Terminal Push Button Starter Switch and Ether Switch, close-up of the metal and black plastic switch with threaded metal base.

    Universal 2 Terminal Push Button Starter Switch and Ether Switch

    Allis-Chalmers
    $12.75
    AB-233D
    Universal 2 Terminal Push Button Starter Switch and Ether Switch with a heavy duty momentary push button design. It features a rubber cap for dust and moisture protection.Part Number:...
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  • Allis-Chalmers Cork Rubber Gasket Material Roll, cylindrical brown gasket material roll with a smooth surface.

    Cork Rubber Gasket Material Roll

    Allis-Chalmers
    $16.75
    AB-1835D
    Cork Rubber Gasket Material Roll for making your own general purpose gaskets. USA made and supplied as a 12" x 24" sheet.Part Number: AB-1835DFitsAllis ChalmersAveryCaseCockshuttFordIH / FarmallJohn...
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  • Allis-Chalmers Plastic Sediment Bowl Screen

    Plastic Sediment Bowl Screen

    Allis-Chalmers
    $4.75
    AB-534D
    Plastic sediment bowl screen for Allis-Chalmers and other tractor applications. Sold individually.Part Number: AB-534DFitsAllis-Chalmers - 190XT, B, C, CA, G, D10, D12, D14, D15, D17, D19, D21, IB,...
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  • Allis-Chalmers Gasket Paper Roll, 98 inches long, flat roll of gasket paper material

    Gasket Paper Roll 98" Long

    Allis-Chalmers
    $18.75
    AB-1844D
    Gasket paper roll for making general purpose gaskets. Not for high temperature applications.Part Number: AB-1844DFitsAllis Chalmers: VariousAvery: VariousCase: VariousCockshutt: VariousFord:...
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  • Allis-Chalmers Gasket Paper Roll 108 Inches Long, plain brown gasket paper roll for industrial sealing applications.

    Gasket Paper Roll 108" Long

    Allis-Chalmers
    $26.75
    AB-1846D
    Gasket paper roll for making general purpose gaskets. Not for high temperature applications.Part Number: AB-1846DFitsAllis Chalmers: VariousAvery: VariousCase: VariousCockshutt: VariousFord:...
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  • Allis-Chalmers Allis Chalmers D15 Diesel D17 D21 190 190XT Tachometer Tach Cable

    Allis Chalmers D15 Diesel D17 D21 190 190XT Tachometer Tach Cable

    Allis-Chalmers
    $36.75
    JD-790D
    Part Number: JD-790DOverviewTachometer tach cable for Allis Chalmers tractors. Fits D15 Diesel, D17, D21, 190, and 190XT applications listed below.FitsAllis Chalmers D15 (Diesel)Allis Chalmers D17...
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  • Allis-Chalmers Tachometer Drive Gasket Kit, two brown gaskets with specific cutouts for engine parts, designed for Allis Chalmers, Case, International, Massey Ferguson, Massey Harris tractors.

    Tachometer Drive Gasket Kit for Allis Chalmers, Case, International, Massey Ferguson, Massey Harris

    Allis-Chalmers
    $9.50
    AB-1822D
    Part Number: AB-1822DOverviewTachometer drive gasket kit for the applications listed below.FitsAllis Chalmers 190XTAllis Chalmers D21Allis Chalmers 170Allis Chalmers 175Allis Chalmers 180Allis...
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  • Allis-Chalmers D21 Tachometer Operation Meter, round analog gauge with black and white dial, orange needle indicating RPM and hours, and digital hour counter display.

    Allis-Chalmers D21 Tachometer Operation Meter

    Allis-Chalmers
    $198.00
    AC-278D
    Tachometer operation meter for Allis-Chalmers D21 tractors. Listed with replacement number 239730 and tach-with-bracket assembly number 70239731.Part Number: AC-278DFitsAllis Chalmers D21Replaces /...
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  • Allis-Chalmers Fuel Filter Bail Assembly with Brass Nut, close-up view of metal fuel filter bail assembly featuring a brass nut for secure fitting.

    Fuel Filter Bail Assembly with Brass Nut

    Allis-Chalmers
    $12.75
    AB-236D
    Fuel Filter Bail Assembly with Brass Nut - AB-236D for the listed tractor models. New part.Part Number: AB-236DFitsAllis Chalmers: 190XT, D21, U, UC, 190 (2.315 Tall Glass Bowl), D15 (Gas (SN: 9001 &...
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  • Allis-Chalmers Sediment Bowl Gasket 2"

    Sediment Bowl Gasket 2"

    Allis-Chalmers
    $2.25
    AB-039D
    Sediment Bowl Gasket 2" for the listed tractor models. Part Number: AB-039D Fits Allis Chalmers: B, C, CA, G, D10, D12, D14, D15 (Gas To Sn# 9000), D17 (Gas To Sn# 42000), I40, I400, I60, I600, 170,...
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  • Allis-Chalmers Universal Choke Cable 72"

    Universal Choke Cable 72"

    Allis-Chalmers
    $14.75
    AB-423D
    Universal choke cable with a 72" metal sheathed length.Cut to length. Can also be used as a stop cable for diesel engines. Various tractors, forklifts, and other applications using 72" or less cable...
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  • Allis-Chalmers Metal Sheathed Choke Cable 47"

    Metal Sheathed Choke Cable 47"

    Allis-Chalmers
    $22.75
    JD-718D
    Metal sheathed choke cable with a 47" length and plastic knob.Cut to length. Thread length where it goes through the dash is 3/8".Part Number: JD-718DFitsAllis Chalmers - various modelsAvery -...
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  • Aftermarket Top Link, industrial mechanical linkage component for heavy machinery or agricultural equipment, shown with a rod and mounting eye

    Top Link, Category 2

    Aftermarket
    $45.75
    FD-346D
    Top Link, Category 2 for tractors using a Cat 2 three-point hitch.Part Number: FD-346DFitsAllis Chalmers: D17, D19, 170, 175, 180, 185, 190, 190XT, 200, 7000; and OTHER MODELS USING CAT 2 THREE POINT...
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