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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.

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  • Allis-Chalmers Magneto PUSH-PULL Ignition Switch Allis Chalmers OEM

    Magneto PUSH-PULL Ignition Switch for Allis Chalmers

    Allis-Chalmers
    $26.75
    AB-489D
    Magneto PUSH-PULL Ignition Switch for Allis Chalmers and other listed applications. This switch has 1 screw type terminal and a threaded stem measuring 3/8 - 32 UNEF.Part Number: AB-489DFitsAllis...
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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 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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  • 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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