|
|
|
|
#1
21-02-08, 06:50
|
|||
|
|||
Derek,
I will ask Bev about them as she keeps a daily diary of our travels but the chance of getting "Sighted Clarkair bulldozer" in her usual couple of paragraphs over "Sighted two squirrels and beautiful wildflowers" does not make me wildly optimistic about a result. One, I am pretty sure was on I-90 going west from Minneapolis about mid-morning - it was actually sitting in a little landscaped garden at the entrance to the company yard. The second one was in the Black Hills area of South Dakota on a pole in a small town, but which one??? Sorry to be so little help but I have to curb my hunting instincts when overseas. Lang 
|
|
#2
24-02-08, 20:19
|
||||
|
||||
|
Quote:
__________________
Quis custodiet ipsos custodes?
|
|
#3
05-03-08, 00:01
|
|||
|
|||
|
Identification
I know which were the main types of dozer/tractor used by the British forces in NW Europe - How would I identify the type from a picture? - that is how would I distinguish a Cat D4 from a Cat D7 from an International ? And what other types were used by other Nations?
|
|
#4
05-03-08, 00:54
|
|||
|
|||
|
I believe the first is a Cat with the british hydraulic set up but which size? the second has a different method of raising the blade - what is it?
|
|
#5
05-03-08, 16:05
|
||||
|
||||
|
Quote:
Noel, I've been waiting in the wings hoping someone would answer your questions so I wouldn't have to expose my utter lack of knowledge on the subject. I'll present what little I know about bulldozers in the hope someone will exclaim, "What's that berk goin' on about now!" and set us both right. I know of three main manufacturers of large bulldozers for the Allies, Caterpillar, International Harvester, and Allis Chalmers. There were other manufacturers of heavy equipment and tractors such as Case, Clark, Barber Ellis, Le Tourneau, and I think JCB to mention a few but as far as I know they didn't make bulldozers other than the dimunitive CA-1. (Jump in anytime guys.) Each type had what a Detroit auto manufacturer would call "design elements", i.e. the Cat D4 and D7 had a flat radiator grill perforated with round holes while the Allis Chalmers had a curved grill with horizontal slats. One should take the time to peruse various pictures of the different bulldozers and you'll start to see some subtle and not so subtle differences. As for raising the blade, I've seen two methods; hydraulic and winch but I couldn't tell you with any definitiveness which manufacturer used what. This is barely a primer on the subject and as I said, hopefully someone else will post further info. CHIMO! Derek.
__________________
Quis custodiet ipsos custodes?
|
|
#6
05-03-08, 16:12
|
||||
|
||||
|
Quote:
__________________
Quis custodiet ipsos custodes?
|
|
#7
05-03-08, 21:24
|
|||
|
|||
|
Derek,
The front radiator cover design is a good ID for different makes. Most WW2 smaller crawlers had hydraulic blades. Most of the Inters had that nicely curving lifting arm while Allis and Cat went for simpler blade arms. The manufacturers relied on proprietry blade/lifting designs so you will find many different blade systems on the same dozer. Most of the big dozers had cable lift blades with either an overhead frame to carry the cable from the rear winch or a "block and tackle" hanging from the front of the tractor with the cable routed through pulleys along the side to the rear winch.. Of course many crawlers were not fitted with blades. The easiest way to tell what you are looking at from photos is: D-4 size engine cover is just below shoulder height for an average man while the D-7 size is well above his head. The little D-2 is about nipple height and the baby Clarkair is waist height.
|
 |
|
|
Hybrid Mode
