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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 tractor ammeter gauge with a black 30-0-30 amp dial, chrome-colored bezel, and separate gold-tone mounting bracket.

    Ammeter Gauge (30-0-30)

    Allis-Chalmers
    $10.00
    A0NN10670A
    Allis Chalmers: D10, D12, D14, D15, D17, D19, D21, 170, 175, 180, 185, 190, 190XT Series l, 190XT Series II, 200, 210, 220, 220FWA, I-40, I-400, I-60, I-600Avery: variousCase: C, CC, D, DC, DI, DO,...
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  • Cylindrical Allis-Chalmers farm tractor air filter with yellow pleated filter media, protective metal mesh, and white end caps.

    Allis-Chalmers Air Filter

    Allis-Chalmers
    $97.75
    AF1000
    Air filter for listed Allis-Chalmers tractors and AC combines. Fits D21 Series II, 190, 190XT, 210, 220 and AC combine G, GH, L and M applications.Part Number: AF1000FitsAllis Chalmers D21, 3500...
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  • Round brown cork fuel-sending-unit gasket with a large center opening and five smaller mounting holes, for Allis-Chalmers and other farm tractors.

    Cork Fuel Sending Unit Gasket - Allis Chalmers, Case, International, John Deere, Massey Ferguson, Minneapolis Moline

    Allis-Chalmers
    $4.75
    AB-3256D
    Part Number: AB-3256DFitsAllis Chalmers - D21, 170, 175, 180, 185, 190, 190XT, 4W220, 4W305, 6060, 6070, 6080, 7000, 7010, 7020, 7030, 7040, 7045, 7050, 7060, 7080, 7580, 8010, 8030, 8050, 8070,...
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  • Two blue water pump housing and mounting gaskets for Allis-Chalmers farm tractors, shown against a white background.

    Allis Chalmers Water Pump Housing & Mounting Gaskets D21 180 185 190 190XT 190XT III 200 210 220 220 FWA 4W-220 7000 7030 7040 7045 7050 7060 7080 7580 8010 8030 8050 8070 860 Cotton Stripper

    Allis-Chalmers
    $5.00
    74026887
    Water pump housing and mounting gaskets for the Allis Chalmers tractors and AC combines listed below.Condition: NewPart Number: 74026887FitsAllis Chalmers D21Allis Chalmers 180Allis Chalmers 185Allis...
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  • A short, hollow cylindrical steel bushing for an Allis-Chalmers farm tractor seat shock, shown at an angle on a white background.

    Allis Chalmers Seat Shock Steel Bushing

    Allis-Chalmers
    $5.95
    70226045
    Seat shock steel bushing for listed Allis-Chalmers tractor models.Part Number: 70226045FitsAllis Chalmers - B, IB, C, CA, RC, WC, WD, WD45, D10, D12, D14, D15, D17, D19, D21, 170, 175, 180, 185, 190,...
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  • Brass temperature sending unit for an Allis-Chalmers D21 farm tractor, with a long probe, threaded hex fitting, green body, and threaded electrical terminal.

    Temperature Sending Unit for Allis-Chalmers D21, 170-7000

    Allis-Chalmers
    $19.75
    70241249
    Temperature Sending Unit for Allis Chalmers tractors.Part Number: 70241249FitsD21, 170, 175, 180, 185, 190, 190XT, 190XT III, 200, 210, 220, 220 FWA, 7000Replaces / Cross Reference70241249, 241249,...
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  • Black 2-1/8-inch NBR sediment bowl gasket for Allis-Chalmers and other farm tractors, shown as a flat circular ring with a large center opening on a white background.

    2-1/8" Sediment Bowl Gasket (NBR) - Allis Chalmers, Case, Cockshutt, International, John Deere, Massey Ferguson, Oliver, White

    Allis-Chalmers
    $2.50
    70208137
    Note: 2-1/8" sediment bowl gasket made from Nitrile butadiene rubber (NBR).Part Number: 70208137FitsAllis Chalmers 190XTAllis Chalmers D15 (Gas models with SN: 9001 & up and all Dsl models)Allis...
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  • Zinc-plated Allis-Chalmers farm tractor grill hood latch kit, showing the main latch assembly with a pull handle and a separate two-hole catch plate on a white background.

    Grill Hood Latch Kit for Allis-Chalmers D21 160 170 175 180 185 190 190XT 190XT III 200 210

    Allis-Chalmers
    $17.00
    70243274
    Grill hood latch kit for select Allis-Chalmers tractors.This kit includes the latch and loop.Part Number: 70243274FitsAllis Chalmers - D21, 160, 170, 175, 180, 185, 190, 190XT, 190XT III, 200,...
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  • Allis-Chalmers Round Radiator Mounting Pad - Allis-Chalmers, Ford, circular black rubber radiator mounting pad with central hole.

    Round Radiator Mounting Pad - Allis-Chalmers, Ford

    Allis-Chalmers
    $4.25
    DJS455
    Round radiator mounting pad for select Allis-Chalmers and Ford tractors.Use the fitment and replacement references below to verify application before ordering.Part Number: DJS455FitsAllis Chalmers -...
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  • Close-up of a silver metal engine oil pressure switch for Allis-Chalmers farm tractors, with a threaded mounting end, black electrical insulator, and flat brass terminal. Product listing names D21, 180, 185, 190, 190XT, 190XT III, 200, 210, and 220 models.

    Allis-Chalmers Engine Oil Pressure Switch D21 180 185 190 190XT 190XT III 200 210 220

    Allis-Chalmers
    $19.95
    74021445
    Part Number: 74021445Allis-Chalmers Engine Oil Pressure SwitchEngine oil pressure switch for listed tractors and combines.FitsAllis Chalmers - D21, 180, 185, 190, 190XT, 190XT III, 200, 210, 220, 220...
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  • Black 2-inch circular NBR gasket for an Allis-Chalmers farm tractor sediment bowl, shown alone against a white background.

    2" Sediment Bowl Gasket (NBR)

    Allis-Chalmers
    $1.70
    70208362
    2" sediment bowl gasket made from nitrile butadiene rubber (NBR).Part Number: 70208362FitsAllis Chalmers - B, C, CA, G, D10, D12, D14, D15 (Gas To Sn# 9000), D17 (Gas To Sn# 42000), I40, I400, I60,...
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  • A two-position push-pull ignition and light switch for an Allis-Chalmers farm tractor, shown isolated on a white background. It has a rectangular metal housing, exposed electrical terminals on top, and a yellow pull knob on a threaded shaft.

    Universal 2 Position Push Pull Ignition Light Switch

    Allis-Chalmers
    $7.50
    SSW2809
    Universal 2 position push/pull switch for ignition or light use. It is non-fused and includes a plastic knob. Part Number: SSW2809 Fits Allis Chalmers - Various Case - Various Cockshutt -...
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  • Round AGCO OEM Allis-Chalmers water temperature gauge for a farm tractor, with a chrome bezel, white dial, white-green-red temperature range, and needle pointing to the low end.

    OEM Allis Chalmers Water Temperature Gauge

    AGCO
    $85.50
    70240989
    OEM AGCO water temperature gauge for listed Allis Chalmers tractors, including 175 Diesel and 190XT with effective serial number 2695 and up.Part Number: 70240989FitsAllis Chalmers 175 DieselAllis...
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  • Round Allis-Chalmers ammeter gauge for farm tractors, marked AMPERES with a 60-0-60 scale, negative and positive indicators, and a central needle at zero.

    OEM Allis Chalmers Ammeter Gauge 60-0-60

    AGCO
    $44.50
    70254407
    OEM AGCO ammeter gauge marked Amperes 60-0-60 for listed Allis Chalmers tractors and power units.Part Number: 70254407FitsAllis Chalmers D10Allis Chalmers D12Allis Chalmers D14Allis Chalmers D15Allis...
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  • Allis-Chalmers farm tractor fuel sending unit 70276224, shown with a long float arm, mounting flange, wires, connector, and circular gasket.

    Allis Chalmers Fuel Sending Unit 70276224

    Allis-Chalmers
    $58.25
    70276224
    Allis Chalmers Fuel Sending Unit for tractors equipped with an electronic fuel gauge.Part Number: 70276224FitsAllis Chalmers - D21, 190, 190XT, 190XT IIIReplaces / Cross...
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  • Round Allis-Chalmers tractor fuel gauge with a silver bezel, white face, black needle, and fuel-level scale marked E, 1/2, and F; the low-fuel segment is red. Part number 70240988.

    Allis Chalmers OEM Fuel Gauge 70240988

    Allis-Chalmers
    $85.50
    70240988
    Allis Chalmers OEM Fuel Gauge for select tractors.This dash mounted fuel gauge is listed as AGCO Brand.Part Number: 70240988FitsAllis Chalmers - D21, 170, 175, 180, 185, 190, 190XT, 190 XT...
    Out of stock
  • Allis-Chalmers Tractor Parts Catalog 2025, vintage farm tractor parts catalog cover with sunset landscape background.

    Allis Chalmers Tractor Parts Catalog

    Allis-Chalmers
    $0.00
    0000
    The Allis Chalmers Tractor Parts Catalog (2025) is a comprehensive parts guide for Allis Chalmers tractors. It is available as a hard copy and as a printable PDF catalog. Part Number: 0000 Current...
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  • Red cylindrical Baldwin hydraulic filter for Allis-Chalmers farm tractors, with black installation pictograms printed on the side.

    Hydraulic Filter for Allis-Chalmers D15 D17 D19 D21 180 185 190 190XT

    Baldwin
    $16.00
    70239930
    Hydraulic Filter for Allis-Chalmers D15, D17, D19, D21, 180, 185, 190, and 190XT.Also fits the 860 Cotton Stripper (1978) with diesel engine (590577-4302 - 9999), 82 SH Side Mounted Mower, and I40 /...
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