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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 Bottom Seat Cushion for D10 D12 D14 D15 D17 D19 D21, black and white padded tractor seat with an orange label on top.

    Allis-Chalmers Bottom Seat Cushion for D10 D12 D14 D15 D17 D19 D21(Display)

    $199.75
    489
    Restoration quality bottom seat cushion for select Allis-Chalmers tractors. Cushion is embossed like original and made in the USA. Part Number: AC-223D Fits D10 D12 D14 D15 D17 D19 D21 170, 175,...
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  • Black & White Seat Back Cushion on Wood, display

    Black & White Seat Back Cushion on Wood - Allis Chalmers (Display)

    $62.50
    488
    Black & white vinyl seat back cushion on wood for listed Allis Chalmers models. Part Number: ACR0853 Fits Allis Chalmers: D10, D12, D14, D15, D17, D19, D21, 170, 175, 180, 185, 190, 190XT, 200, 210,...
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  • Black & White Seat Cushion Bottom on Wood - Allis Chalmers, display seat cushion in plastic packaging with orange identification tag.

    Black & White Seat Cushion Bottom on Wood - Allis Chalmers (Display)

    $95.00
    487
    Black & white vinyl seat cushion bottom on wood frame for listed Allis Chalmers models. Part Number: ACR0852 Fits Allis Chalmers: D10, D12, D14, D15, D17, D19, D21, 170, 175, 180, 185, 190, 190XT,...
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  • Wire Mini Alternator with Pulley 35 Amp, compact metal automotive alternator with pulley and wiring connector, displayed on a plain surface.

    1 Wire Mini Alternator with Pulley 35 Amp (Display)

    $159.50
    465
    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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  • Wire Mini Alternator with Pulley 35 Amp, showing a compact automotive alternator with attached pulley and electrical connector on a brown background.

    1 Wire Mini Alternator with Pulley 35 Amp (Display)

    $159.50
    466
    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 D21 Fan Belt 70240595, black rubber V-belt with grooved inner surface designed for heavy-duty tractor engine drive.

    Allis Chalmers D21 Fan Belt 70240595

    Allis-Chalmers
    $13.75
    70240595
    Fan belt for Allis Chalmers D21 tractors up to SN 4445.Measures 0.520" wide by 57" long.Part Number: 70240595FitsAllis Chalmers D21 - up to SN 4445John Deere 3010 Diesel, 3020 Diesel with Alternator...
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  • Allis-Chalmers Head Gasket Set HS4888 74036370 for Allis Chalmers and Gleaner, engine gasket kit with multiple gaskets and a head gasket.

    Head Gasket Set HS4888 74036370 for Allis Chalmers and Gleaner

    Allis-Chalmers
    $180.00
    74036370
    Head Gasket Set HS4888 74036370Head gasket set for the listed Allis Chalmers and Gleaner diesel applications.Part Number: 74036370FitsAllis Chalmers - 210 w/ 670T (D3400/D3500) 6-cyl turbo diesel;...
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  • Allis-Chalmers Manifold Gasket Set, engine gasket set for various Allis Chalmers tractor models including 7030, 7040, 7045, 7050, 7060, 7080, 7580, 8030, 8050, 8070.

    Allis Chalmers Manifold Gasket Set 7030 7040 7045 7050 7060 7080 7580 8030 8050 8070

    Allis-Chalmers
    $31.25
    ACR0281G
    Allis Chalmers, Gleaner CombinesManifold gasket set for the listed Allis Chalmers tractors and Gleaner combines.Part Number: ACR0281GFitsAllis Chalmers - D21, 210, 220, 4W-220, 7030, 7040, 7045 (sn...
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  • Allis-Chalmers Roosa Master D DB Fuel Injection Pump Turbo Charger Service Manual, orange spiral-bound manual with diagram and text on the cover.

    Roosa Master D DB Fuel Injection Pump Turbo Charger Service Manual

    Allis-Chalmers
    $42.75
    MANPUMP
    Part Number: MANPUMPRoosa Master D and DB Fuel Injection Pump Service Manual158-page service manual for Roosa Master D and DB series fuel injection pumps. It covers troubleshooting, repair,...
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  • Allis-Chalmers Air Filter for Allis Chalmers D21, cylindrical engine air filter with pleated paper element and plastic frame.

    Air Filter for Allis Chalmers D21

    Allis-Chalmers
    $74.25
    AF835K
    Allis-Chalmers D21 (3400 Series Engine, Series I) Air filter for the listed Allis-Chalmers, industrial, and cross-reference applications. Part Number: AF835KFits Allis-Chalmers: D21 (3400 Series...
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  • Allis-Chalmers Clutch Pedal Shaft Seal for Allis Chalmers D21, round seal with brown exterior, used for tractor clutch mechanism repair.

    Clutch Pedal Shaft Seal for Allis Chalmers D21

    Allis-Chalmers
    $12.75
    70240981
    Allis Chalmers clutch pedal shaft seal for D21.Part Number: 70240981FitsAllis Chalmers: D21Replaces / Cross Reference70240981240981Specs2 used per tractor1.388" OD1.125" ID0.125" wideNotes2 used per...
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  • Allis-Chalmers Exhaust Pipe 190XT D21 190, black elongated metal pipe for tractor exhaust system.

    Allis-Chalmers Exhaust Pipe 190XT D21 190

    Allis-Chalmers
    $72.00
    ACR1564
    Exhaust pipe for select Allis-Chalmers tractors with a black finish and listed dimensions.FitsAllis Chalmers 190XT (W/ Diesel Engine 1964-1973)Allis Chalmers D21 (W/ Diesel Engine 1963-1969)Allis...
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  • Fleetguard Engine Oil Filter for Allis Chalmers 70239930, white cylindrical filter with red logo and text

    Fleetguard Engine Oil Filter for Allis Chalmers 70239930

    Fleetguard
    $17.75
    LF581
    Fleetguard engine oil filter for Allis Chalmers applications. Fits D15, D17 from SN#68628, D19 from SN#12021, D21, 180, 185, 190 up to SN#25518, and 190XT up to SN#25518.Part Number: LF581FitsAllis...
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  • Fleetguard Engine Oil Filter, Allis-Chalmers D17 D19 D21 180 185 190 190XT 210 220 6060 6070 6080 compatibility, cylindrical white lube filter with black gasket and red Fleetguard logo, model LF682.

    Fleetguard Engine Oil Filter Allis-Chalmers D17 D19 D21 180 185 190 190XT 210 220 6060 6070 6080

    Fleetguard
    $19.75
    LF682
    Fleetguard engine oil filter for Allis-Chalmers and Ford applications.Part Number: LF682FitsAllis Chalmers D17 (Diesel From SN# 117087)Allis Chalmers D19 DieselAllis Chalmers D21Allis Chalmers...
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  • Allis-Chalmers Belt Pulley Engagement Rod Knob 70228401, black plastic knob with a rounded top and a cylindrical base

    Allis Chalmers Belt Pulley Engagement Rod Knob 70228401

    Allis-Chalmers
    $8.25
    70228401
    Allis Chalmers belt pulley engagement rod knob for All D-Series tractors, including D21.Use this knob for shift control, range transmission, brake control, and brake system applications.Part Number:...
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