The first machine to wear the markings “82-50” appeared in 1967. It was an experimental version of Euclid’s existing model 82-40 track-type tractor powered with a GM 8V-71T diesel and did not progress beyond the prototype stage.
Work on what was to become the Terex 82-50 began in earnest in 1971 when GM engineers fitted a 12V-71 engine into the frame of an upgraded 82-40EA chassis. A series of pre-production prototypes followed and these were sent into the field for rigorous testing in all types of jobs.These pre-production machines were known as Terex model 972s and differed considerably from the original project concept.
The Terex 82-50 was designed to compete with the Caterpillar D9G and also replace the company’s existing model 82-80 (TC-12), which had been in continuous production since 1955 and was, by then, quite outdated.
Production model Terex 82-50s made their debut in 1973 to much fanfare. Tipping the scales at approximately 48 tons fully equipped and powered by a GM Detroit Diesel 12V-71T turbocharged V-12 diesel putting out 370 flywheel horsepower, the 82-50 certainly sounded as powerful as it looked!
An Allison 3-speed powershift transmission turned all that horsepower into forward motion and ultimately through the usual Terex planetary final drive system.
The machine’s radiator was mounted in the rear just as with other Terex crawlers, and driven by an extension shaft from the engine.
This made the machine particularly suitable for landfill or land-clearing operations where clogging or damage to the radiator’s fins in a conventionally configured machine was a problem.
Particular care had been given to the undercarriage to make it as resilient as possible and a campaign was undertaken early on in the machine’s life to beef up the bottom roller mountings of all machines in the field when several machines experienced track rollers separating from the roller frame.
The standard undercarriage consisted of an 84” gauge track frame with an oscillation shaft for each frame just in front of the sprocket and joined at the front by a pinned equalizer bar.
38-section sealed tracks with 24” extreme service shoes were standard ex-factory but other options could be fitted at the buyer’s request.
Track tension was maintained by a nitrogen-charged, hydraulically-adjusted recoil cylinder on each track frame.
Although an open ROPS canopy was standard equipment (see picture pxx), the majority of the machines were delivered with the enclosed ROPS cab.
In a departure from traditional Terex control layout, the steering controls were mounted in a console to the operator’s left, next to the transmission control, a position that has now become the standard for almost all track-type dozers.
Visibility from the cab was average and it was not the quietest of working environments either!
Attachments
Options for the 82-50 were quite varied.
The standard bulldozer blade was a 13’ 3” semi-U, and an even larger 16’ full-U could be substituted. There was also a cushioned push blade option. Terex manufactured these blades themselves. No angle blades were offered.
When it came to the ripper there were two choices, Kelly or Ateco.
By far the most popular was the Ateco 3-shank, parallelogram V-LPAS variable incidence “Vyba” model which featured dense rubber cushion blocks at the top of the ripper shanks to increase fracture rate through the ground. To date, Ateco is the only manufacturer to offer this type of ripper.
CRC-Kelly offered the massive single shank KR400 radial arc ripper which could be sunk to a depth of almost 11 feet!
The Terex 82-50 was manufactured solely at Terex’s Hudson, Ohio, USA facility and exported worldwide.
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Brief Specifications – Terex 82-50
Engine: General Motors 12V-71T turbocharged V-12 diesel rated at 370 flywheel horsepower @ 2100 rpm.
Transmission: Allison CRT7031, 3-speed full powershift transmission
Top Speed: 7 mph in 3rd gear
Brakes: Oil-cooled multiple disc
Steering: Multiple disc clutches
Gauge: 84”
Track: 38-section, sealed
Std.Shoe 24” extreme service (other options available).
Length: 16’ 2” (bare)
Width: 9’ 5” (bare)
Height: 9’ 2” (to top of ROPS)
Operating Weight: Approx. 48 tons with semi-U blade & 3-shank ripper
