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The HH Pressure Digger delivers 20′ digging depth, 56” auger capacity, and dependable hydraulic drive power — built for electric utility, municipal, and construction drilling.
HH Hydraulic Pressure Digger
The HH is the lightest-duty member of the Highway pressure diggers. This unit is small enough to get into tight spaces, but tough enough to drill holes up to 20′ deep with augers as wide as 56″.
Built for lighter-duty jobs, it’s a favorite for sign installs, smaller utility projects, and anywhere maneuverability matters. With smooth hydraulic controls and a compact footprint, the HH gets in, gets the hole dug, and gets out without the bulk of a big rig.
What to know:
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Compact hydraulic drive – ideal for tight work areas.
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Dig depth: up to 20′.
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Auger capacity: up to 56″ diameter.
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Hydraulic 3″ solid kelly bar.
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Smooth joystick controls for easy operation.
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Customizable with pole setters, winches, storage, and lighting.
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Perfect for light to medium-duty applications like signs, sports lighting, and small utilities.
HH Hydraulic Pressure Digger Specifications
Standard
| Feature | Specification |
|---|---|
| Engine | John Deere 134 HP (100 kW) diesel; other makes available |
| Max Rotary Torque | 25,000 ft/lbs (33,895 Nm) |
| Rotary RPM | 0–110 RPM, variable speed |
| Kelly Bar | 3” (76.2 mm) solid |
| Kelly Bar Crowd Force | 28,000 lbs max |
| Retract Force | 11,400 lbs max |
| Standard Digging Depth | 10’ (3.05 m) standard; optional up to 20’ (6.1 m) |
| Hole Diameter | Up to 56” (1.42 m) |
| Turntable Base | 240 degrees |
| Mainframe Travel | 36” (914.4 mm) |
| Outriggers | Rear A-frame |
| Fuel Capacity | Off chassis (optional 50 gallon / 189.27 L) |
| Basic Unit Weight | 12,500 lbs (5,669.9 kg) |
| Hydraulic Tool Circuit | Fixed location |
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
| Feature | Specification |
|---|---|
| Engine Options | Other engine makes available |
| Digging Depth | Up to 20’ (6.1 m) |
| Outriggers | Straight‑down rear or add front A‑frame (in lieu of rear only A‑frame) |
| Fuel Capacity | 50 gallon (189.27 L) |
| Polesetter Package | Fixed or 6’ (1.83 m) telescoping |
| Service Winch | 12,000 lb (5,443.1 kg) capacity |
| Water Tank | 100 gallon poly or steel (378.5 L) |
| PTO Driven | Driven off chassis engine |
| Hydraulic Hose Reel | 50’ (15.24 m) hydraulic hose |
| Auger Tooling | Auger storage, adapters & extensions |
| Tool Boxes & Storage | Tunnel storage |
| Lighting | Work & safety lighting packages |
| Outrigger Pads | Included as option |
| Wheel Chocks | Included as option |
| Front Winches & Capstan Hoists | Available as option |
| Air Compressors | Available as option |
| Generators & Inverters | Available as option |
| Cab Guards | Available as option |