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| Looked at what was susposed to be a 1973 d8h today but it had the huge older style moter in it and the serial number started with 46a. Is this machine a little longer in the tooth than adveritised? |
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Somerville, Indiana | Don't know. Would think 1973 would be very close to the introduction of the 8K wouldn't you? I have heard very good reports of the D8H though, never been around that size. Spacer plate engine would sure be nice. I will see what I can find out and get back to you. 46A - I have heard mentioned many times with an 8H series. I think.
Edited by dave morgan 12/11/2007 23:12
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| Didn't the d8's go to the 3306 motor in the early 70's Dave? |
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NW Washington | Maybe the Antique Caterpillar Owners Club would have info on a 73 D-8.
http://www.acmoc.org/
http://www.antiquecaterpillar.org/
Edited by JohnW 12/12/2007 02:28
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sw corner ia. | no they did not. Giant six running 1200rpm was used till the L's which used the 3406. Much better choice from a mechanics point of view, but didn't have that sound. |
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Central / West Texas | From cat performance manual D8H 46A built from 58-74 270HP weighs 48k Should be a powershift which is good. Probally no turbo. I beieve the blade on these lifts hyrdauilcally |
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sw corner ia. | In the H series you could get cable or hyd. on blade, since there were a lot of cable scrapers still being pulled then, 36A was same tractor but direct drive. I have seen several 7E's that were cable as well built in same time frame.
K series had hp increase to 300 same motor, but 21000# more weight. Interesting stuff, I haven't thought about that in a long time. Still wish I could run a TC12. |
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Shaftsbury, Vermont (SW VT) | 21 k more weight? Holy crap!!!! I knew they were biggerer, but that's a bunch!
I ran a 7E in the Reserves, one heck of a machine, especially compared to the 7F that "replaced" it. The F's were more nimble, though, but they couldn't grunt and push what the older ones could. Not to mention the neat shotgun seat. Good for someone training, or just watching out for Indians. |
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Somerville, Indiana | Whayne parts give the 46A manufactured in the same time frame as daveswia states. I have much more info from the D7 series, the D7E still had four of the D8Hs 6 cylinders. D7D 17A18692 has turbo, dry air cleaner, power steering, still dry brakes and turning clutches, oil master clutch, 5 spd forward 4 reverse with 5 th spd having no neutral or reverse capabilities, pony engine, hydraulics in 1960. Also same engine as the D7E apearance but 7E had increased cooling and different heads than did the early D7D series, 7E has a wider radiator, 180 hp compared to 140 in D7D late 17A, looks huge compared to the 7D, also has a belt driven generator instead of gear drive for the D7D. The D7F has either the 3306 or 333 depending on source and order, 3306 should be certain in later models as did the D6Cs. Whayne had two 7Fs in for certified rebuilt last year for the Army. They had around 1500 hours each on them.
The D8H surely has a turbo as its older sister D7D here has. The four cylinder version in the 7 holds 18 gallons of coolant and was one of my first indepth experiences with coolant cleanliness and treatment from the mechanics at Whayne.
There were many D8Hs working pulling scrapers when labor was cheap in comparison to iron. The D8K followed the 8H in around 1975, depending on overlaping series, and had the spacer plate engine as did many models of D7Gs. 7Gs were good tractors and were built for many years including past the D6E of the mid ninetys.
I really think the 8Ks had a more modern engine, can't advise what it was but sure it was different than the huge lumbering big block of the 7Ds, Es, and 8Hs. D7 17A 18692 has 1250 operating rpm on the tag. Not to run down the 'huge lumbering big blocks' as they seem to run forever - operator or service error usually puts them in the service bay. Low liners is one drawback to the older engines, that's why the spacer plate engine made its debute. When compression or coolant showed a low liner, the block was counterbored to accept a single spacer to bring the block back to specs.
Edited by dave morgan 12/12/2007 16:00
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Central / West Texas | Cat performance book states early 8K weighs 69000. It states 8K has turbo and is 300hp. Also it has sealed tracks. Whaterever that means becasue our old 8k always sqeuked and squaked. The newer 6R hightrak does not sqeak and I understand it has sealed traks. I think Id look for an 8k they are not too much more and probally easier to get parts for. Stay away from cable blades lotsa maintenence and no down pressure. It will skip over the high areas. |
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SE PA | Better follow the links that JW posted. Be sure to examine the u/c before buying, as a worn out u/c will cost big $$$$ to try and fix, and if this isn't a production sort of machine, it's basically wasted money. One some of the older D8's guys have been known to buy 2 machines...... one that works, and one that has a good u/c. On older machines it's cheaper to buy a 2nd machine for the u/c than it is to buy new tracks......
Rodney |
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sw corner ia. | I rather liked the cable blade except for no tilt. Lot faster response, no hot hyd oil. tank by your arm. Blades were usually heavy enough you don't miss down pressure if the cutting bits were good.
You run oil rails long enough and they will squeal too, when you get some dry links.
8K had same c.i. 6cyl. motor as all the older 8's, but the block looks different to me, and sounds like more rpm, maybe 14 or 1500. Has real power when you let off the pedal too. Got some video of a K and I think a 46A cutting a dam for a road near home here a few years ago, should post it on youtube, except it would probably be so boring they would throw me out. |
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D8h info Dave Morgan?
