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AC HD4

According to Norm Swinford's book, translated by me, the H4 and HD4 was a new drivetrain, set on the H3/HD3 undercarriage. Whereas the H3/HD3 was mostly a D15 on tracks, the H4/HD4 had the naturally aspirated 4 cylinder 2200 series AC engine with torque converter drive, and hydraulic shuttle shift. The 200 cu. in. engine, both gas and diesel, is the same basic engine later used in the 6000 series tractors, and smaller Gleaners. The HD4 became the 650 series. The engine is just a 4 cylinder version of the 6 cylinder 301 cu. in. engine used in many tractors and combines.
I found nothing on weight.
 


8500# dozer would make the bucket loader about the same size as a JD 350 dozer???? I saw this machine for sale online and could see the side of a Detroit in it but don't know if it's 53 or 71 series. I couldn't even tell how many cylinders. Looks like it may have a hand clutch.
 

Looks like a hand clutch on the right side not the left like a HD5. The machine is also green and it looks like the original color. The ad says HD4 Allis Chalmers but it might be an Oliver with a Detroit. I'm gonna have to go look at it I guess.
 
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