HeavyBuild Project

🚜 Euclid TC-12 Twin Crawler – The World's Most Powerful Crawler of Its Time

Introduced by Euclid, a Division of General Motors, in 1955, the legendary TC-12 Twin Crawler redefined heavy earthmoving. Instead of a single engine, it featured two independent GM Detroit Diesel 6-71 engines, each driving its own crawler through an Allison Torqmatic transmission. This revolutionary twin-power design delivered outstanding traction, maneuverability, and productivity on massive construction, mining, and logging projects.

Specifications
• Manufacturer: Euclid Division of General Motors
• Model: TC-12 Twin Crawler Tractor
• Introduced: 1955
• Engines: 2 × GM Detroit Diesel Series 6-71
• Total Gross Power: 388 hp (194 hp per engine)
• Transmission: Allison Torqmatic semi-automatic
• Operating Weight: Approx. 58,000 lb (26.3 t)
• Top Speed: 8.3 mph (13.4 km/h)
• Maximum Drawbar Pull: 54,000 lb

Nearly 70 years later, the Euclid TC-12 remains one of the most iconic and innovative crawler tractors ever built—an engineering masterpiece that helped shape the future of heavy equipment.

🇺🇸 Caterpillar 120M AWD Ex-Army Motor Grader

Built to serve. Engineered to last. The Caterpillar 120M AWD is a military-proven motor grader designed to deliver exceptional performance in harsh environments. Many ex-army units were originally used by military engineering corps for building roads, maintaining airfields, and supporting logistics operations before entering the civilian market. Their rugged construction and well-maintained service history have made them highly sought after by contractors and collectors alike.

Powered by the legendary Cat C6.6 ACERT™ turbocharged 6-cylinder diesel engine, the 120M AWD delivers 140–185 hp (103–136 kW) net with VHP Plus, automatically adjusting horsepower to match working conditions. The All-Wheel Drive (AWD) system provides outstanding traction on soft ground, steep grades, snow, and muddy terrain, making it one of the most capable graders in its class.

Key Specifications

🔸 Engine: Cat C6.6 ACERT™ turbocharged diesel
🔸 Net Power (VHP Plus): 140–185 hp (103–136 kW)
🔸 Transmission: 8-speed forward / 6-speed reverse powershift
🔸 Drive: Full-Time All-Wheel Drive (AWD)
🔸 Moldboard Width: 12 ft (3.7 m)
🔸 Maximum Operating Weight: Approximately 16.5–17.5 tonnes (depending on configuration)
🔸 Applications: Road construction, mine haul roads, airfields, forestry, and military engineering support.

"Military toughness meets Caterpillar reliability—ready to shape roads anywhere the mission takes it."

🚧 Built for the Toughest Underground Conditions. 🚧

Meet the Elphinstone UG20M Underground Motor Grader—a purpose-built machine engineered in Australia to keep underground mine haul roads smooth, safe, and productive. Built on the proven Cat® 120M2 platform, the UG20M combines Caterpillar reliability with Elphinstone's specialized underground mining expertise, delivering exceptional grading performance where space is limited and conditions are demanding.

🔧 Key Specifications
Manufacturer: Elphinstone Pty Ltd (Authorized Caterpillar OEM)
Model: UG20M Underground Motor Grader
Base Platform: Caterpillar 120M2
Engine: Cat C7.1 ACERT™ diesel
Emission Options: Tier 4 Interim / EU Stage IIIB (configuration dependent)
Gross Power: 145–189 hp (108–141 kW) SAE J1995
Transmission: Cat powershift countershaft
Gears: 8 Forward / 6 Reverse
Operating Mass (GVM): Approximately 18,000 kg (39,683 lb)
Blade Width: 12 ft (3.66 m) standard, 10 ft (3.05 m) optional
Frame Articulation: 20° left/right
Steering Angle: 47.5° left/right
Tires: 14.00R24 tubeless
Standard Features: Low-profile ROPS/FOPS cab, air conditioning, electro-hydraulic joystick controls, reverse camera, automatic fire suppression, automatic lubrication, LED lighting, differential lock, and electronic throttle control.
🏗️ A Brief History

Elphinstone has supported the global mining industry for more than 50 years, designing specialized underground equipment sold and serviced through the worldwide Cat dealer network. The UG20M was developed to provide superior haul-road maintenance in underground mines, helping reduce haul truck tire wear, improve travel speeds, and increase overall mine productivity while maintaining high operator comfort and safety.

Precision. Reliability. Underground Performance.
The Elphinstone UG20M proves that even beneath the surface, world-class engineering keeps mining operations moving.

Built to Work. Built to Last.

The Allis-Chalmers HD-11 was introduced in 1955 as a completely new crawler tractor, replacing the HD-9 and becoming one of the company's most successful mid-size bulldozers. Designed and built in Springfield, Illinois, USA, the HD-11 earned a reputation for durability in construction, logging, mining, and land clearing across North America.

Factory Specifications (Early HD-11):
• Engine: Allis-Chalmers D-516 inline 6-cylinder diesel
• Displacement: 516 cu in (8.5 L)
• Gross Power: 110 hp (82 kW)
• Net Power: 99 hp (74 kW) @ 1,800 rpm
• Transmission: 6-speed sliding gear (direct drive)
• Fuel Capacity: 60 US gal (227 L)
• Operating Weight: Approx. 22,200 lb (10,070 kg) without attachments
• Track Gauge: 74 in (1.88 m)
• Built in: Springfield, Illinois, USA

Later HD-11 variants (HD-11E, HD-11B, HD-11EP, and Series B) introduced more powerful engines, torque converters, powershift transmissions, and turbocharging, increasing output to as much as 150 hp in the HD-11EP.

More than 70 years later, the HD-11 remains a respected piece of American earthmoving history—a machine remembered for its rugged engineering, dependable performance, and unmistakable Allis-Chalmers heritage.

John Deere 700J LGP – Precision Meets Reliability.

Introduced in 2005, the John Deere 700J LGP was engineered to deliver outstanding grading performance, low ground pressure, and dependable power. Equipped with a 6.8L John Deere PowerTech™ turbocharged diesel engine, it produces 115 hp (86 kW) and features a smooth dual-path hydrostatic transmission for precise control in challenging terrain.

Specifications
• Engine: John Deere PowerTech™ 6068H
• 6-cylinder, 6.8L Turbo Diesel
• Net Power: 115 hp (86 kW)
• Operating Weight: Up to 32,500 lb (14,740 kg)
• Transmission: Dual-path hydrostatic drive
• LGP Track System for superior flotation on soft ground

Built for construction, land clearing, forestry, and site preparation, the 700J LGP has earned a reputation for durability, fuel efficiency, and operator comfort. Even after years in service, it's still one of the most respected mid-size crawler dozers in the field.

🔥 Built to Move Mountains Before It Was Cool.

The Terex TS-14 is one of the most legendary twin-engine motor scrapers ever built. Originally introduced by Euclid in the early 1960s and later produced under the Terex name after GM rebranded the heavy equipment division in 1970, the TS-14 earned a reputation for speed, reliability, and exceptional earthmoving productivity on large construction and mining projects.

Specifications (early TS-14 series):
🏗️ Type: Twin-Engine Motor Scraper
⚙️ Engines: Dual Detroit Diesel 4-71 two-stroke diesel engines
💪 Combined Net Power: Approximately 290 HP (216 kW)
🪣 Heaped Bowl Capacity: 20 cu yd (15.3 m³)
📏 Cutting Width: 9 ft 10 in (3.0 m)
🚜 Top Speed: Up to 29 mph (47 km/h)
🌍 Application: Large-scale earthmoving, highway construction, dams, and open-pit mining.

More than 60 years after its debut, the TS-14 remains an icon among scraper enthusiasts and continues to be restored and operated around the world—a testament to its rugged engineering and timeless design.

⚙️ Michigan 110HT – A Classic Earthmoving Legend

Built during the early 1970s, the Michigan 110HT Elevating Scraper was engineered for high-production earthmoving without requiring a push tractor. Featuring a twin-engine, all-wheel-drive design and a self-loading elevator system, it became a dependable choice for highway construction, large grading projects, and dam construction across North America.

Factory Specifications:
Manufacturer: Clark-Michigan Company (USA)
Model: 110HT Elevating Scraper
Production: Early 1970s–early 1980s
Machine Type: Twin-Engine Elevating Scraper
Heaped Bowl Capacity: 16 cu yd (12.2 m³)
Engines: 2 × Detroit Diesel 4-71N naturally aspirated 4-cylinder diesel
Power: 144 hp (107 kW) each — 288 hp (214 kW) total
Transmission: 2 × Clark 5-speed Powershift
Drive: All-wheel drive
Operating Weight: Approx. 23,500 kg (51,800 lb)
Loaded Weight: Approx. 40,000 kg (88,000 lb)
Top Speed: About 28 mph (45 km/h)

Built to move dirt efficiently and reliably, the Michigan 110HT remains one of the most recognizable elevating scrapers from the golden era of American heavy equipment.