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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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  • A complete Allis-Chalmers D21 Series I tractor vinyl decal set arranged on a white background, including long gray-and-silver hood and stripe decals marked “D21” and “ALLIS-CHALMERS,” smaller warning and instruction labels, and the Allis-Chalmers logo.

    Allis-Chalmers D21 Series I Vinyl Decal Set

    Allis-Chalmers
    $143.00
    DJS172
    Part Number: DJS172Product OverviewVinyl decal set for the Allis-Chalmers D21 Series I. Listed for 1963-1965 models.FitsAllis-Chalmers D21 Series I (1963-1965)NotesVinyl decals
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  • Allis-Chalmers tractor seat rod hardware kit displayed on a white background, with two bronze-colored round washers, six split roll pins, and two silver three-pronged retaining clips.

    Allis Chalmers Seat Rod Hardware Kit

    Allis-Chalmers
    $12.75
    SEAT001
    Allis Chalmers seat rod hardware kit for select tractor models. Includes stainless washers, split retaining rings, and stainless roll pins.Part Number:...
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  • Allis-Chalmers Water Pump for Allis-Chalmers D21, 180, 185, 190, 190XT, with black metal housing and mounting holes for radiator connection.

    Water Pump for Allis-Chalmers D21, 180, 185, 190, 190XT

    Allis-Chalmers
    $99.75
    74007554
    Water pump for Allis-Chalmers D21, 180, 185, 190, and 190XT tractors.Includes gaskets. For both gas and diesel models with a steel line that screws into the pump housing with 7/8" - 18 thread.Part...
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  • Tachometer drive gear assembly for Allis-Chalmers farm tractors, shown with a black oval housing, brass mounting plate, black fitting, and two screws. Fits models 190, 190XT, 200, 210, and 220.

    Tachometer Tach Drive Gear Assembly for Allis-Chalmers 190, 190XT, 200, 210, 220

    Allis-Chalmers
    $44.00
    70246764-A
    Tachometer Tach Drive Gear Assembly for Allis-Chalmers tractors with generator or alternator driven tachometer.Part Number: 70246764-AFitsAllis Chalmers - D21, 170, 175, 180, 185, 190, 190XT, 200,...
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  • Allis-Chalmers farm tractor tachometer drive gear assembly kit, with black housing, threaded drive, separate gear, two screws, and gasket, shown on a white background.

    Allis-Chalmers Tachometer Drive Gear Assembly

    Allis-Chalmers
    $44.00
    70246764-B
    Tachometer drive gear assembly for the listed applications below. Note: 70246764-B is made for Aftermarket AlternatorsPart Number: 70246764-BFitsAllis Chalmers - D21, 170, 175, 180, 185, 190, 190XT,...
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  • Long, straight black exhaust pipe for Allis-Chalmers 190XT, D21, and 190 farm tractors, shown vertically against a white background.

    Allis-Chalmers Exhaust Pipe for 190XT, D21, 190

    Allis-Chalmers
    $79.25
    s234x48
    Replacement exhaust pipe for Allis-Chalmers 190XT, D21, and 190 tractors.For 190 gas and diesel models, use with AC-2231D muffler.Part Number: s234x48FitsAllis-Chalmers 190XTAllis-Chalmers D21...
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  • Black rectangular Allis-Chalmers tractor turbocharger-to-exhaust-manifold mounting gasket, with two large rectangular openings and four bolt holes at the corners, shown against a white background.

    Turbocharger to Exhaust Manifold Mounting Gasket

    Allis-Chalmers
    $6.00
    AB-2511D
    Turbocharger to exhaust manifold mounting gasket for the listed tractor, combine, and industrial applications.Part Number: AB-2511DFitsAC Combines - F2, F3, G, K2, L, L2, M, M2, M3, N5, N6, R5,...
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  • Allis-Chalmers large brake riveting tool for farm tractors, featuring a heavy black C-shaped frame with a threaded opening in the upper block and two separate cylindrical pins beside it, shown on a white background.

    Large Brake Riveting Tool

    Allis-Chalmers
    $99.75
    MI-2547D
    Large brake riveting tool for various tractor applications. Includes the listed punches and dimensions.Part Number: MI-2547DFitsAllis Chalmers - various models - Use for ACR3539Case - various...
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  • Close-up product photo of a black 12-volt, 3-post saddle-mount starter solenoid for an Allis-Chalmers farm tractor. It has two large copper threaded terminals, a smaller control terminal, and metal mounting tabs; labels read “12V” and “733 102.”

    Starter Solenoid 3 Post Saddle Mount 12 Volt

    Allis-Chalmers
    $31.25
    DR1467
    3 post saddle mount starter solenoid for 12 volt systems only. Fits multiple Allis-Chalmers, Case, Cockshutt, International, John Deere, Massey Ferguson, Minneapolis Moline, Oliver, and White...
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  • Roll of black 2-inch fuel tank webbing for Allis-Chalmers farm tractors, with a short length unrolled.

    Allis-Chalmers Fuel Tank Webbing - Black 2"

    Allis-Chalmers
    $2.75
    351T84
    Black fuel tank webbing sold per foot. Fits tractors using webbed insulation between fuel tank mounts and sheet metal parts.Part Number: 351T84FitsAllis Chalmers: variousCase: Fits various...
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  • A coil of tan 1-inch fuel tank webbing with a short length unrolled, for Allis-Chalmers farm tractors.

    Allis-Chalmers Fuel Tank Webbing - Tan 1"

    Allis-Chalmers
    $3.25
    3531T51
    Tan fuel tank webbing sold per foot. Fits tractors using webbed insulation between fuel tank mounts and sheet metal parts.Part Number: 3531T51FitsAllis Chalmers: Fits various modelsCase: Fits various...
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  • Roll of white 1-inch fuel tank webbing for Allis-Chalmers farm tractors, with a short strip extending from the roll.

    Allis-Chalmers Fuel Tank Webbing - White 1"

    Allis-Chalmers
    $1.75
    88445K45
    White fuel tank webbing sold per foot. Fits tractors using webbed insulation between fuel tank mounts and sheet metal parts.Part Number: 88445K45FitsAllis Chalmers: variousCase: variousCockshutt:...
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  • A roll of tan 2-inch-wide fuel tank webbing for Allis-Chalmers farm tractors, with a loose end extending to the right.

    Fuel Tank Webbing - Tan 2" - Price Per Foot

    Allis-Chalmers
    $5.65
    3531T53
    Fuel tank webbing for tractors using webbed insulation between the fuel tank mounts and sheet metal parts. Sold by the foot.Part Number: 3531T53FitsAllis-Chalmers - various modelsCase - various...
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  • Roll of white 1½-inch fuel tank webbing for Allis-Chalmers farm tractors, sold per foot.

    Fuel Tank Webbing - White 1-1/2" - Price Per Foot

    Allis-Chalmers
    $1.95
    88445k46
    Fuel tank webbing for tractors using webbed insulation between the fuel tank mounts and sheet metal parts. Sold by the foot.Part Number: 88445k46FitsAllis-Chalmers - various modelsCase - various...
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  • Allis-Chalmers tractor seat adjustment bolt with a long threaded shaft, a wing nut and washer at one end, and a rounded bolt head at the other.

    Allis Chalmers Seat Adjustment Bolt

    Allis-Chalmers
    $9.00
    SEAT002
    Allis Chalmers seat adjustment bolt with listed replacements for the bolt and wing nut.Part Number: SEAT002FitsAllis Chalmers: D10, D12, D14, D15, D17, D19, D21, 170, 175, 180, 185, 190, 190XT, 200,...
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  • Black-and-white seat-back cushion for an Allis-Chalmers farm tractor, with black vinyl side panels and a white center panel.

    Black & White Seat Back Cushion on Wood - Allis Chalmers

    Allis-Chalmers
    $78.00
    ACR0853
    Black & white vinyl seat back cushion on wood for listed Allis Chalmers models.Part Number: ACR0853FitsAllis Chalmers: D10, D12, D14, D15, D17, D19, D21, 170, 175, 180, 185, 190, 190XT, 200, 210,...
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  • Black-and-white Allis-Chalmers farm tractor seat cushion bottom mounted on a wooden base, shown from above.

    Black & White Seat Cushion Bottom on Wood - Allis Chalmers

    Allis-Chalmers
    $118.75
    ACR0852
    Black & white vinyl seat cushion bottom on wood frame for listed Allis Chalmers models.Part Number: ACR0852FitsAllis Chalmers: D10, D12, D14, D15, D17, D19, D21, 170, 175, 180, 185, 190, 190XT, 200,...
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  • Gray nylon washer for an AGCO oil pan drain plug, part 70226012, for Allis-Chalmers farm tractors.

    OEM Nylon Washer Oil Pan Drain Plug 70226012

    AGCO
    $4.75
    70226012
    OEM nylon washer oil pan drain plug for listed Allis Chalmers, Case, Cockshutt, Ford, International, and John Deere applications.Part Number: 70226012FitsAC Miscellaneous - Power Unit: 60H (Power...
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