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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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  • Aftermarket 3 PT Lynch Pin, metallic pin with a circular ring for securing attachments in farming equipment.

    3 PT Lynch Pin

    Aftermarket
    $2.00
    MI-119D
    3 PT Lynch Pin for 3-point equipped tractors and implements using 7/16" diameter pins.Part Number: MI-119DFitsAllis ChalmersAveryCaseCockshuttFordIH / FarmallJDMassey FergusonMassey...
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  • Allis-Chalmers Ammeter Amp Gauge (30-0-30)

    Ammeter Amp Gauge (30-0-30)

    Allis-Chalmers
    $19.75
    AB-109D
    Ammeter amp gauge with a 30-0-30 range, chrome bezel, and 2" diameter hole fitment.Fits the tractor models and applications listed below.Part Number: AB-109DFitsAllis Chalmers: D10, D12, D14, D15,...
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  • Allis-Chalmers Allis Chalmers Amp Gauge B C CA G WC WD WD45 WF D14 D15 D17

    Allis Chalmers Amp Gauge

    Allis-Chalmers
    $29.75
    AC-258D
    Allis Chalmers amp gauge with a chrome bezel and restoration quality finish.Fits the Allis Chalmers models listed below.Part Number: AC-258DFitsAllis Chalmers: B, C, CA, G, WC, WD, WD45, WD45D, WF,...
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  • Allis-Chalmers AMMETER (AMP) GAUGE, 60-0-60 - AB-466D

    AMMETER (AMP) GAUGE, 60-0-60

    Allis-Chalmers
    $19.75
    AB-466D
    Ammeter (amp) gauge with a 60-0-60 range, chrome bezel, and no logo.Fits most tractors equipped with an alternator and a 2" diameter hole.Part Number: AB-466DFitsAllis ChalmersAveryCaseCockshuttFord
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  • Aftermarket In-Line Fuel Filter AB-490D

    In-Line Fuel Filter for Various Models

    Aftermarket
    $12.95
    AB-490D
    In-line fuel filter for various models using 3/8" fuel lines. Includes hose and clamps.Use to help keep rust and dirt out of the carburetor.Part Number: AB-490DFitsAllis...
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  • Allis-Chalmers Brass Sediment Bowl Screen, metallic brass disc with a fine mesh pattern for filtering sediment.

    Brass Sediment Bowl Screen

    Allis-Chalmers
    $3.75
    AB-229D
    Brass sediment bowl screen for listed tractors and combines.Part Number: AB-229DFitsAllis Chalmers - 190XT, B, C, CA, D10, D12, D14, D15, D17, D19, D21, G, I40, I400, I60, I600, IB, RC, U, UC, WC,...
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  • Allis-Chalmers Sediment Bowl Gasket 2-1/8"

    Sediment Bowl Gasket 2-1/8"

    Allis-Chalmers
    $3.00
    JD-642D
    Sediment bowl gasket, 2-1/8". Fits listed Allis-Chalmers and other tractor models listed below.Part Number: JD-642DFitsAllis-Chalmers - 190XT, D15 (Gas models with SN: 9001 & up and all Dsl models),...
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  • Allis-Chalmers Sediment Bowl Glass, clear transparent glass sediment bowl used in fuel systems for filtration.

    Sediment Bowl Glass

    Allis-Chalmers
    $5.75
    AB-124D
    Sediment bowl glass for listed tractors and combines.Part Number: AB-124DFitsAllis Chalmers - 190XT, D15 (Gas (SN: 9001 & up), & All Diesel), D17 (Gas (SN: 42001 & up) & All Diesel), D19 (Gas (SN:...
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  • Allis-Chalmers Exhaust Turbo Elbow D19, D21, 210, 220, 7000, 7010, 7020, 3-inch metal turbo exhaust elbow with flange for industrial engines.

    Allis Chalmers Exhaust Turbo Elbow D19, D21, 210, 220, 7000, 7010, 7020

    Allis-Chalmers
    $82.00
    AC-307D
    Exhaust turbo elbow for Allis Chalmers diesel tractors. Listed for D19, D21, 210, 220, 7000, 7010 and 7020 applications.Part Number: AC-307DFitsAllis Chalmers D19Allis Chalmers D21Allis Chalmers...
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  • Allis-Chalmers Electrical Outlet Socket, metallic electrical outlet with mounting base and screw terminals for device connection.

    Electrical Outlet Socket

    Allis-Chalmers
    $32.75
    AB-395D
    2-pin electrical outlet socket for ALL implements with lights. Fits Allis-Chalmers, Avery, Case, Cockshutt, Ford, IH / Farmall, John Deere, Massey Ferguson, Massey Harris, MM, and Oliver applications...
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  • Allis-Chalmers Carb Elbow and Strainer Assembly

    Carb Elbow and Strainer Assembly

    Allis-Chalmers
    $8.75
    AB-297D
    Carb elbow and strainer assembly for Allis-Chalmers and other listed tractors. New part with male end screen end 1/8" pipe thread and female end 1/4" flare.Part Number: AB-297DFitsAllis...
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  • Allis-Chalmers Exhaust Manifold Gasket Material AB-448D

    Exhaust Manifold Gasket Material

    Allis-Chalmers
    $19.75
    AB-448D
    Perforated steel core gasket material used to make manifold gaskets.Part Number: AB-448DFitsAllis ChalmersAveryCaseCockshuttDavid BrownFordIH / FarmallJohn DeereMassey FergusonMassey...
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  • Allis-Chalmers PTO Over-Running Clutch, heavy-duty agricultural machinery part with mounting and release mechanism.

    PTO Over-Running Clutch

    Allis-Chalmers
    $70.75
    MI-118D
    PTO over-running clutch - MI-118D for the listed tractor brands.Tractors up to 75 horsepower.Part Number: MI-118DFitsAllis ChalmersAveryCaseCockshuttFordIH / FarmallJohn DeereMassey FergusonMassey...
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  • Allis-Chalmers PTO Over-Running Clutch, mechanical tractor part with mounting component and removal tool.

    PTO Over-Running Clutch

    Allis-Chalmers
    $70.75
    MI-138D
    PTO over-running clutch - MI-138D for the listed tractor brands.Tractors up to 75 horsepower.Part Number: MI-138DFitsAllis ChalmersAveryCaseCockshuttFordIH / FarmallJohn DeereMassey FergusonMassey...
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  • Allis-Chalmers Combo Light Switch Knob, black plastic knob only for lighting control.

    Combo Light Switch Knob (Knob Only)

    Allis-Chalmers
    $7.95
    AB-536D
    Combo light switch knob only for multiple tractor applications. Preserves the original handle-style knob requirement where noted.Part Number: AB-536DFitsAllis-Chalmers: 190, D21, D19, D17 (SN: 42001...
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  • Allis-Chalmers Round Fender and Cab Mount Amber Warning Light

    Round Fender and Cab Mount Amber Warning Light

    Allis-Chalmers
    $19.75
    AB-544D
    Round fender and cab mount amber warning light with amber lenses and a black diecast base. Double-contact bulb, 12-volt, 4" lens diameter.Part Number: AB-544DFitsAllis Chalmers: D21, 160, 170, 175,...
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  • Allis-Chalmers Combo Light Switch Assembly with Knob, industrial electrical switch with black knob and metal components.

    Allis Chalmers Combo Light Switch Assembly with Knob

    Allis-Chalmers
    $19.75
    AB-541D
    Combo light switch assembly with knob.Part Number: AB-541DFitsAllis Chalmers: D10, D12, D15 (sn 9001 & up), D17 SN: 42001 & up, D19, D21, 190 upt to SN: 19000, 190XT up to SN: 19000Case: LA, SC, DC,...
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  • Allis-Chalmers 12V Sealed Beam Combo Tail Light Assembly, black round sealed beam tail light with wiring and mounting hardware.

    Allis Chalmers 12V Sealed Beam Combo Tail Light Assembly

    Allis-Chalmers
    $116.75
    AC-355D
    Allis Chalmers 12V sealed beam combo tail light assembly in black with a 4-3/4" diameter.Part Number: AC-355DFitsAllis Chalmers: 190XT (up to SN 19000), D10, D12, D15 (SN 9001 & up), D17 (SN 42001 &...
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