In the early 1970s, Allis-Chalmers joined the ranks from the manufacturers offering articulated 4×4 tractors. They started simply by rebadging the Bearcat through Stieger in 1972 plus calling it the design 440. This 160 equine tractor got them in the field as they developed new in-house. The 440 transported them through 1975 till the 7580 emerged in 1976 as Allis-Chalmer’s (A-C) 1st in-house articulated 4×4. It had been a good tractor but a little underwhelming in light of the brutal competition in the super tractor horsepower wars that were starting to flare up.
Late in 1977, the particular 8550 debuted as A-C’s biggest tractor. They ranked it at 250 drawbar horsepower, though the Nebraska check would give it a few more. Although it wasn’t the biggest or most effective tractor on the market, it was within the top tier and provided A-C plenty to crow about. A-C knew beforehand it would need to up the bet and had begun the development of a brand new six-cylinder engine that would turn out to be known as the 6120T. It out of place 731 cubic inches plus cranked out 300 flywheel horsepower. It was a destroked (5. 625 vs six. 50) derivative of a type of 844 ci, 21000 plus 25000 series diesels that were on the truck, heavy gear, marine and industrial marketplace since 1968. Yeah, Allis-Chalmers had it’s own motor division, formerly the Buda Engine Company, which this acquired in 1953.
Of course , the tractor is more than plus engine. The 6120T has been backed up by A-C’s 20-speed Power Director transmission. It had been a beefed up edition of what was used in the particular 7580 4×4 and the simple design and operation was your same as what had been released into the 7000 series vehicles just a year before. The 1000 rpm PTO has been standard, as was strength steering and a burley moving drawbar. A three stage, Cat 4 hitch has been optional. A ROPS (Rollover Protection System) cab has been standard, with heat plus AC. AM, AM/FM plus AM/FM/8-Track were optional.
Since the 8550 was in the top rate of the high power tractor market, the A-C advertising folks took full benefit of that fact. Before long, the marketing was using the term Extremely Beast was being applied as well as the name has stuck. The particular 8550 is the Super Animal, then, now and permanently.
The 8550 brought heavy tractor marketplace parity for A-C yet that didn’t necessarily cause a big jump in product sales or profits. That was not the fault of the tractor as much as it was a combination of the particular failing tractor market, the particular national economy and the options A-C made to deal with all that.
The 8550 has been built into 1981 and replaced by 4W-305, Mechanically, the particular 4W-305 was the same tractor but it got a much enhanced cab, new styling plus a host of small enhancements. The 7580 was likewise updated into the 4W-220. The particular American recession of the earlier ‘80s were disastrous meant for agriculture and that hit character and the industries that provided them very hard. As A-C’s financial situation grew more dangerous, they were vulnerable to an acquistion and that happened in May associated with 1985, when the German business Klockner-Humboldt-Deutz took them more than. The company became Deutz-Allis through the start of 1986, most of the A-C line had been stopped and replaced with Euro-built Deutz built products. Some A-C tractors continued to be in production until Dec of 1985 and those had been rebadged “Deutz-Allis, ” together with any tractors remaining within dealer inventory.
In the end, approximately one, 020 8550 tractors had been built and 412 4W-305s. Those really aren’t poor numbers overall. Generally speaking, the particular articulated four-wheel drive tractor acquired risen to prominence within the ‘70s but slipped in reverse a little by the ‘80s since the FWA (Front Wheel Assist) variant of the standard tractor became a rising celebrity in the market. It much less costly and could do 80 % (at least) of such a similar-sized articulated tractor can do. That gave this a more generic place in the marketplace, leaving the big articulated products to their specialty work in super farming and specialty earthmoving.
1978 Allis-Chalmers 8550
Motor: AC 6120T
Shift: 731 ci
Weary & Stroke: 5. 250 x five. 625 in.
*Rated Drawbar Strength: 224 @ 2500
*Rated PTO Power: 254 @ 2500
Flywheel Power: three hundred @ 2500
Compression Ratio: 16. 25: one
Weight: 28, 500 lbs.
Wheelbase: 126 in.
LxWxH: 285 x 95. 5 by 139
Fuel Capacity: 170 gal.
Tires: 20. 8-38
*Fuel Consumption: 17. four GPH @ full energy
*Drawbar Draw: 26, 200 lbs. @ 15% slip
*Top Speed: 19. several mph
2. As Rated by Nebraska Tractor Test 1262
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