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Compare technical specifications, horsepower ratings, hydraulic capacities, and dimensions across all tractor models.
Model overview
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66 HP
Allis Chalmers
HD7
Catalog archiveEngine and power
Rated horsepower
66 HP
PTO horsepower
—
Engine displacement
3.5 L
Cylinders
3 cylinders
Fuel type
Diesel
Transmission and drive
Drive system
Tracks (Crawler)
Transmission type
Sliding gear (4F/1R)
Forward / reverse gears
4 fwd / 1 rev
Weight and capacities
Operating weight
6,350 kg
Hydraulic total flow
—
ASABE Field Implement Capacity Matchup
Max Subsoiler (12" depth)
1 Shanks
Max Disk Harrow (8 mph)
6 ft (2 m)
Max Air Seeder (5.5 mph)
15 ft (5 m)
Target Ballast & Balance
Heavy-draft standard (30/70 for 2WD, 40/60 for MFWD, 55/45 for 4WD)
6,930 lbs
50% Front / 50% Rear
Est. Fuel Burn (75% Load)
2.4 gal/h (9.1 L/h)
Provenance and serial decoders
Production years
1940–1950
Assembly factory
West Allis, Wisconsin, USA
Serial decoder support
Curated High-Draft Showdowns
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World-Record Titans
World’s Largest vs Modern Quad-Track
16V-747
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700+ HP High-DraftVS
Tracked 4WD Titans
Articulated Four-Track Showdown
9RX 770
Steiger 715
770 HP vs 715 HPCompare Now →
340 - 450 HPVS
Row-Crop Flagships
Heavy Field Draft & Precision Planting
8R 410
Magnum 340
443 HP vs 340 HPCompare Now →
500 - 524 HPVS
German 500+ HP Titans
Stepless High-Traction System Tractors
Xerion 5000
1050 Vario
524 HP vs 500 HPCompare Now →
300 - 315 HPVS
European Contractor Flagships
300+ HP High-Speed & Tillage Duel
728 Vario
T7.315
303 HP vs 313 HPCompare Now →
Historic American Row-CropVS
1970s Muscle Legends
Sound-Gard Green vs Turbo Red Duel
4440
1466 Turbo
153 HP vs 147 HPCompare Now →
Historic MuscleVS
Golden Age Classics
Historic American Row-Crop Duel
4020 Diesel
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101 HP vs 140 HPCompare Now →