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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 12 Volt Bulb for Allis-Chalmers and More, clear glass automotive light bulb with metal base and filament inside.

    12 Volt Bulb for Allis-Chalmers and More

    Allis-Chalmers
    $3.00
    AB-345D
    12 volt bulb for listed tractors and equipment, including Allis-Chalmers, Case, Ford, International, John Deere, Massey Ferguson, Massey Harris, Minneapolis Moline, and Oliver.Part Number:...
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  • Allis-Chalmers Chrome Dash Light Cover, shiny metallic chrome dash light cover with a smooth, rounded top surface.

    Allis-Chalmers Chrome Dash Light Cover

    Allis-Chalmers
    $18.99
    JD-589CHD
    Chrome dash light cover for select Allis-Chalmers, John Deere, and MM tractors. This 1-1/4 inch diameter chrome cover is for 2-screw style dash lights.Part Number: JD-589CHDFitsAllis Chalmers: D10,...
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  • Allis-Chalmers 4.5-inch Clamp Ring with Screw for Allis-Chalmers equipment, black metal clamp with securing screw.

    4.5" Clamp Ring With Screw for Allis-Chalmers

    Allis-Chalmers
    $20.75
    JD-676D
    4.5" clamp ring with screw for select Allis-Chalmers and other applications. New condition.Part Number: JD-676DFitsAllis Chalmers: 7050, 7030, 6040, 220, 210, 200, 190, 185, 180, 175, 170, 160, D21,...
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  • Allis-Chalmers 12-Volt Dash Light Assembly, stainless steel dash indicator with red wiring for Allis-Chalmers tractors.

    12-Volt Dash Light Assembly for Allis-Chalmers

    Allis-Chalmers
    $31.75
    AC-273D
    12-volt dash light assembly for Allis-Chalmers tractors.Chrome finish with a 0.658" socket diameter and 1" center-to-center mounting holes.Part Number: AC-273DFitsAllis-Chalmers 190XTAllis-Chalmers...
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  • Allis-Chalmers Thermostat w/ Gasket for Ford Models, automotive radiator thermostat with gasket for engine cooling system repair.

    Thermostat w/ Gasket for Ford Models

    Allis-Chalmers
    $14.50
    AB-052D
    Part Number: AB-052DThermostat w/ Gasket for Ford ModelsThermostat with gasket for Ford models only. New part with multiple tractor applications listed below.FitsAllis Chalmers - 4W220, D21, 210,...
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  • Allis-Chalmers RADIATOR DRAIN PLUG | Hydraulic Drain Plug | Block Drain Plug

    Allis-Chalmers Radiator Drain Plug

    Allis-Chalmers
    $4.00
    AB-209D
    Radiator, hydraulic, and block drain plug with broad tractor fitment. Thread size is 1/4" - 18 NPT.Part Number: AB-209DFitsAllis Chalmers: IB, B, C, RC, CA, WC, WF, WD, WD45, D10, D12, D14, D15, D17,...
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  • Allis-Chalmers Radiator Mounting Pad

    Radiator Mounting Pad for Allis-Chalmers and More

    Allis-Chalmers
    $4.00
    AB-455D
    Universal radiator mounting pad made from rubber and sized at 1 3/4" x 1 3/4" x 1/4" thick.Use on listed Allis-Chalmers models and other tractor applications below.Part Number: AB-455DFitsAllis...
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  • Allis-Chalmers 12 volt Voltage Regulator, black rectangular electrical component for Allis Chalmers tractors and equipment models 190XT, D21, 160, 185, 200, 170, 175, 180, 190, 210, 220, with product number 70243986.

    Voltage Regulator for Allis-Chalmers 190XT D21 160 185 200 170 175 180 190 210 220

    Allis-Chalmers
    $36.75
    AB-1148D
    12 volt voltage regulator for Allis-Chalmers tractors, for the models listed below.Part Number: AB-1148DFitsAllis-Chalmers: 190XT, D21, 160, 185, 200 (with factory alternator), 170, 175, 180, 190,...
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  • Allis-Chalmers Raincap 3 in. 3 3/16 in. I.D., a durable metallic rain cap with mounting plate for protection and weather resistance in agricultural machinery.

    Raincap 3 in. 3 3/16 in. I.D.

    Allis-Chalmers
    $16.00
    RC-009D
    Part Number: RC-009DRaincapRaincap with a 3" - 3 3/16" inside diameter.FitsAllis ChalmersCaseCockshuttDavid BrownFordIH / FarmallJohn DeereMassey FergusonOliverSpecs3" - 3 3/16" I.D.
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  • Allis-Chalmers 1 Wire Mini Alternator with Pulley 35 Amp 1/2 Pulley

    1 Wire Mini Alternator with Pulley 35 Amp

    Allis-Chalmers
    $199.50
    AB-535D
    1 wire mini alternator with pulley, 35 amp. Used to convert 6 volt systems to 12 volt systems on negative ground systems only. Preferred for tractors requiring a smaller diameter alternator for...
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  • Allis-Chalmers ALTERNATOR PULLEY 2-1/2" OD 5/8" belt width

    Allis-Chalmers Alternator Pulley 2-1/2" OD 5/8" Belt Width

    Allis-Chalmers
    $23.95
    AB-495D
    Alternator pulley for the listed tractor applications. Same applications as part number AB-418D alternator.Part Number: AB-495DFitsAllis ChalmersCaseCockshuttFordIH / FarmallJohn DeereMassey...
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  • Allis-Chalmers Universal Alternator Mounting Bracket Kit

    Universal Alternator Mounting Bracket Kit

    Allis-Chalmers
    $44.75
    AB-404D
    Universal alternator mounting bracket kit for switching from a generator to an alternator. May have to be drilled or modified for your application.Part Number: AB-404DFitsAllis...
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  • Allis-Chalmers Raincap 1 1/4" - 1 7/16" I.D., a metal raincap with bolts and a latch for secure fit.

    Allis Chalmers Raincap 1 1/4" - 1 7/16" I.D.

    Allis-Chalmers
    $9.50
    RC-002D
    Part Number: RC-002DOverviewRaincap with 1 1/4" - 1 7/16" I.D. for the listed tractor applications.FitsAllis ChalmersCaseCockshuttDavid BrownFordIH / FarmallJohn DeereMassey FergusonOliverSpecsInside...
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  • Allis-Chalmers Raincap 2 1/2" - 2 11/16" I.D., metallic raincap with mounting bracket and hinges.

    Allis-Chalmers Raincap 2 1/2" - 2 11/16" I.D.

    Allis-Chalmers
    $11.25
    ACR1802
    Raincap with 2 1/2" - 2 11/16" I.D. Listed for select Allis-Chalmers and other tractor brands below.Part Number: ACR1802FitsAllis ChalmersCaseCockshutt: CO-OP E4, E5Cockshutt 40, 50, 560, 570 GOLDEN...
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  • Allis-Chalmers RAINCAP 2-1/2 in OD Zinc-Plated, metal rain cap for industrial or agricultural applications.

    RAINCAP 2-1/2 in OD Zinc-Plated

    Allis-Chalmers
    $34.50
    RC-014D
    RAINCAP with 2-1/2" OD zinc-plated construction.Fits straight chrome pipe applications.Part Number: RC-014DFitsAllis ChalmersFordIH / FarmallJohn DeereStraight chrome pipeSpecs2-1/2" ODZinc-plated
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  • Allis-Chalmers Radiator Cap Allis Chalmers Case

    Allis-Chalmers Case Radiator Cap

    Allis-Chalmers
    $24.75
    AC-209D
    Chrome-plated radiator cap for select Allis-Chalmers and Case tractors and equipment. For pressurized systems and listed for the applications below.Part Number: AC-209DFitsAllis Chalmers - CA, D10,...
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  • Allis-Chalmers Fuel Cap for D21, 190, 190XT, 200, 210, 220 tractors, circular metal fuel cap with a central locking mechanism.

    Allis Chalmers Fuel Cap for D21, 190, 190XT, 200, 210, 220

    Allis-Chalmers
    $29.75
    AC-336D
    Fuel cap for select Allis-Chalmers tractors. Fits listed D21, 190, 190XT, 200, 210, 220, and 7000-series models.Includes gasket. Condition: New.Part Number: AC-336DFitsAllis Chalmers - D21, 190,...
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  • Allis-Chalmers Fuel Cap Gasket for Allis-Chalmers D21, 7000 Series, close-up of the rubber gasket used for sealing the fuel cap on vintage Allis-Chalmers tractors.

    Fuel Cap Gasket for Allis-Chalmers D21, 7000 Series

    Allis-Chalmers
    $5.75
    AB-1221D
    Fuel cap gasket for listed Allis-Chalmers, Case, International, and John Deere models. Cork construction with measured inside and outside diameters listed below.Part Number: AB-1221DFitsAllis...
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