The following data was obtained from Norm Swinford's excellent book on construction machinery:
653 Dozer 1970-1975
Replaced the HD4 Series, built at the Springfield plant. Used the same engine as the HD4, a 200 cu. inch 4 cylinder. A heavier track design was used in the 650 series—this increased weight from 8,500 #’s for the HD4 to 8,900 #'s. HP was 59 @ 2,100 RPM. With the 93-inch push beam angle dozer and hydraulics, the weight was 11,250 #’s.
Since it was based on the HD4 design with improvements, I can't see it being a bad dozer. However, I don't own one so maybe someone out there who uses one can add some hands-on experience and comments.