Rediscovering the 1964 Hough H90-DM Loader Built for the U.S. Army Corps of Engineers

[MikePhua]

The Hough Legacy and Military Engineering Roots
The Hough H90-DM was a heavy-duty wheel loader manufactured by Hough Equipment Company, a Chicago-based firm that pioneered articulated loaders in the mid-20th century. By the 1960s, Hough had become a subsidiary of International Harvester, and its machines were widely adopted by both civilian contractors and military engineering units. The H90-DM variant was specifically configured for the U.S. Army Corps of Engineers, designed to meet the rugged demands of military construction, road building, and logistical support in remote environments.
With a Cummins JT-6 diesel engine under the hood, the H90-DM delivered reliable torque and fuel efficiency, even under extreme conditions. Its 4-in-1 bucket allowed for dozing, clamshell loading, grading, and scraping—making it a versatile tool for field operations. The loader’s robust frame, planetary axles, and high ground clearance made it suitable for off-road deployment, from forest trails to undeveloped military sites.
A Forgotten Machine in the Woods
Decades after its service, one such H90-DM was discovered sitting quietly along a hiking trail in a Massachusetts state forest. The loader appeared largely intact, with its bucket still mounted and tires not yet sunken into the soil—a sign that it hadn’t been abandoned for as long as one might expect. The engine covers were removed, suggesting a mechanical issue had halted its use, but the overall condition hinted at a machine that could be revived with effort.
The location raised questions about ownership. While the loader bore markings from the Corps of Engineers, its presence on state land suggested it may have been transferred, loaned, or simply left behind after a project. Such scenarios are not uncommon; surplus military equipment often finds its way into state or municipal fleets, especially during infrastructure booms or emergency response efforts.
Evaluating Restoration Potential
Before considering restoration, several factors must be assessed:

• Engine condition: Check if the Cummins JT-6 turns freely. A seized engine may require a full rebuild or replacement.
  
• Hydraulic integrity: Inspect cylinders, hoses, and control valves for leaks or corrosion.
  
• Transmission and driveline: Verify fluid levels and look for signs of gear wear or clutch failure.
  
• Electrical system: Older machines often suffer from degraded wiring and corroded terminals.
  
• Legal status: Confirm ownership and obtain permission before any recovery or repair work begins.
  

If the engine is free and the frame is sound, the H90-DM could be a candidate for restoration. Parts for vintage Hough loaders are still available through specialty suppliers and salvage yards, and the Cummins JT-6 remains supported due to its widespread use in industrial applications.
Historical Significance and Collector Appeal
Military-marked equipment carries a unique appeal among collectors and historians. The Corps of Engineers played a pivotal role in post-WWII infrastructure development, and machines like the H90-DM were instrumental in building roads, airstrips, and supply depots across the globe. Restoring such a loader not only preserves mechanical heritage but also honors the legacy of military engineering.
In recent years, restored military construction equipment has appeared in museums, parades, and historical reenactments. A fully functional H90-DM could serve as a centerpiece for such events, especially if its original markings and paint scheme are preserved or replicated.
Field Anecdotes and Practical Advice
One retired quarry mechanic recalled working on Hough loaders in the 1970s, praising their simplicity and brute strength. He noted that the planetary axles rarely failed, and the Cummins engines could run for thousands of hours with basic maintenance. Another operator shared that his unit had a 4-in-1 bucket that made it indispensable for cleanup and grading tasks, especially in tight quarters where multiple machines couldn’t be deployed.
For those considering a restoration:

• Begin with a thorough inspection and documentation of all components
  
• Prioritize engine and hydraulic systems before cosmetic work
  
• Use original manuals or military tech bulletins for reference
  
• Join vintage equipment forums and military surplus networks for parts and advice
  

Conclusion
The 1964 Hough H90-DM is more than an old loader—it’s a piece of American engineering history tied to the mission-driven work of the U.S. Army Corps of Engineers. Whether left behind after a forgotten project or awaiting rediscovery in the woods, machines like this deserve a second look. With the right hands and a bit of grit, the H90-DM can roar back to life, reminding us that even rusted iron still holds stories worth telling.