Unidentified Crawling Object
Please Help Identify This Crawler!
by Steven W. Terpstra
Please help identify this old crawler. My dad has had this machine for about 30 years. When he bought it,
it had a Ford Model A engine and transmission. He believes that it came from the factory with a
Waukesha engine and a reverser gear box. The crawler moves forward by turning the transmission input
shaft counter clock-wise. This means that the Model A transmission had to be in reverse for the crawler
to move forward. Dad quickly discovered that it was too slow in forward to be of any use. Therefore the
engine and transmission were removed and sold. I recently required this old machine and now have it
completely disassembled. I can't find a tag or stamps anywhere. I did find four 1/8 inch holes in the grill
where a tag once was, but it no longer exists. I have searched the Internet, Barnes & Noble, and our
Public Library for information and photos and have found nothing. I am now turning to Yesterday's
Tractors On-Line Magazine in hopes of finding out what it is and where I can get parts and a reverser
gear box. I am not too concerned about an engine at this time. I'm afraid that the only numbers I can find are
the casting numbers on the cast iron parts. They are as follows:
The transmission case, the steering clutch housing and the final drive carriers are all one
piece and were built from machine-formed steel and then welded together. The
four-speed transmission gears and shift tower appear to have been borrowed from a truck.
You can see where it originally had a lever and rod on the shifter stick for a reverse gear
lockout. It has three fork rails in the tower, but only two forks, no reverse. The casting number
on the inside of the tower reads: BB-7222 CS. One of the numbers on the fork reads: DG&M BB-7230 and
there is a small diamond shaped emblem that is hard to see - but appears to have an "L" and a "D" (not
sure). The stamp on the steering clutch reads as follows: "Rockford Drilling Machine Company", Rockford
Illinois, Patent #1,753,085, Pullmore trademark. All of the roller bearings are made by Fafnir, while all
of the pocket bearings are made by Bantam. All of the seals are made by National. That's it for
- Front idler wheel forks (supports): T 742 I & T 742 w
- Rear drive sprockets: T 701 1
- Track shoes: T 701-5
- Drive side of winch: T 733 1
- Brake side of winch: T 733 2
- Steering clutch bearing supports (both): T 724 6
Overall dimensions are: 3 feet wide by 8 feet long by 4 feet high. Shoe size is 7-1/2 inches wide by
6-1/2 inches long. It has 28 track links. Drive sprockets are 24 inches and front idlers are 18 inches. The
transmission input shaft is the same as a PTO shaft, 1-3/8 inch six-spline. The original color
of this crawler is yellow, but it has been repainted orange.
Any information on this machine and parts for it would be greatly appreciated. I have all sorts
of grinders, a welder and even an old Craftsman metal lathe, so if I can find some sort of a
reverser box I should be able to adapt it.
Thank you very - Steven W. Terpstra
Steve can be reached via e-mail at firstname.lastname@example.org.
He can also be reached via phone at (406) 252-7174, or through postal mail at
5224 Hillcrest Road, Billings MT 59101.
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