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The Highway HFMS Mechanical Pressure Digger features a 30′ digging depth and 72” auger capacity, built for high-volume utility and foundation drilling projects.
Highway HFMS Pressure Digger
Built for tough ground and tougher conditions, the HFMS is Highway’s environmentally-friendly and low-maintenance mechanical drive pressure digger with a 4.5″ internally sealed kelly bar — keeping leaks in check and maintenance low, even in brutal cold or sensitive sites.
It’s all Made in the USA muscle with torque, depth, and reach to take on serious utility work, and the kind of build quality that’s still going strong decades later.
What to know:
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4.5″ internally sealed kelly bar – leak-resistant, long-life design.
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65,000 ft/lbs torque – drives augers up to 72″ diameter.
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Dig depth: up to 25′ (optional 30′).
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Mechanical drive – proven for 30–40 years of service.
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Chassis flexibility – mounts to single rear axle or specialty carrier.
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Operator-friendly – command seat, optional pole setter, and easy setup.
- Decades of proven durability – many still running from the 1960s, even in Alaska’s harshest conditions.
Highway HFMS Pressure Digger Specifications
Standard
| Feature | Specification |
|---|---|
| Engine | John Deere 134 HP (100 kW) diesel; other makes available |
| Max Rotary Torque | 65,000 ft/lbs (88,128 Nm) |
| Rotary RPM | 0–233 RPM, variable speed |
| Kelly Bar | 4.5” (114.3 mm) internally sealed |
| Digging Depth | Up to 25’ (9.15 m) |
| Hole Diameter | Up to 72” (1.83 m) |
| Basic Unit Weight | 14,500 lbs (6,577 kg) |
| Kelly Bar Crowd Force | 22,700 lbs max |
| Retract Force | 11,900 lbs max |
| Turntable Base | 240 degrees |
| Mainframe Travel | 36” (914.4 mm) |
| Outriggers | Rear A-frame |
| Hydraulic Tool Circuit | Fixed location |
| Warranty | 5 years on final drive |
Optional equipment includes auger adapters/extensions, tool boxes, tunnel storage, work & safety lighting, outrigger pads, wheel chocks, front winches, capstan hoists, air compressors, generator & inverters, cab guards, and more.
Optional
| Optional Feature | Specification / Option |
|---|---|
| Extended Digging Depth | Up to 30’ (9.15 m) |
| Alternate Kelly Bar | 3” solid bar |
| Polesetter Package | Fixed or 6’ (1.83 m) telescoping |
| Service Winch | Mast Mount 8,000 lbs |
| Water Tank | 100-gallon poly or steel (378.5 L) |
| Outriggers | Straight‑down rear or add front A‑frame (in lieu of rear Only A‑frame) |
| Hydraulic Hose Reel | 50’ (15.24 m) hydraulic hose |
| Fuel Capacity | Optional 50-gallon (189.27 L) tank |
| Outboard Leveling | 20° to 20’, 10° to 30’ |
| Augers & Tooling | Auger storage, adapters, extensions |
| Tool Boxes & Storage | Tunnel storage |
| Work & Safety Lighting | Available |
| Outrigger Pads, Wheel Chocks | Available |
| Front Winches & Capstan Hoists | Available |
| Air Compressors, Generator & Inverters | Available |
| Cab Guards | Available |