HHF Hydraulic Pressure Digger

The Highway HHF Hydraulic Pressure Digger offers 25′ digging depth and 72” auger capacity with hydrostatic drive — ideal for demanding utility and foundation projects.

Most Highway MFG pressure diggers remain in service for 15–20 years, and often longer with regular maintenance. It’s not uncommon to see well-maintained units still operating reliably after 25 years. Older equipment can often be repowered or refurbished to extend its working life even further. - 100 Years of Highway

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With a standard 10’ digging depth that can be extended to 25’ and a robust 240° turntable base, the HHF gives operators exceptional reach and maneuverability.

HHF Hydraulic Pressure Digger

The HHF brings hydraulic ease to big utility work. With joystick controls, your choice of 3″ solid or 4.5″ sealed kelly bar, and the flexibility to run off PTO or a dedicated engine, it’s built for crews who want smooth operation without giving up digging muscle.

This hydraulic pressure digging machine bridges the gap between nimble hydraulics and the raw torque of mechanical drive, making it a versatile choice for heavy-duty utility, lighting, and infrastructure projects.

What to know:

  • Choice of kelly bar – 3″ solid or 4.5″ sealed.
  • Dig depth: up to 25′.
  • Kelly Bar Crowd Force - 22,700 lbs max (28,000 with 3” bar)
  • Auger capacity: up to 72″ diameter.
  • Hydraulic drive – smooth joystick controls, fast setup.
  • PTO or dedicated engine drive options.
  • Built for heavier-duty utility work – ideal for poles, signs, and large infrastructure.
  • Customizable with pole setters, winches, lighting, and storage.
Talk to an Expert

Talk to The Experts at Highway MFG

Need More Info? Give us a call at 952-938-2889 during business hours or fill out the inquiry form here. We look forward to speaking with you.

100 Years of Highway

For nearly a century, Highway MFG has been setting the standard in pressure diggers—delivering reliability that stands the test of time. It’s not uncommon to see our units out in the field for 15, 20, even 25 years. With a little regular maintenance, Highway diggers just keep on boring.

Made in the USA

Built in Minnesota and engineered for the toughest jobs utility and construction crews can throw at them. From custom chassis and boom lengths to tool circuits and heavy-duty components, these machines are made to handle whatever comes their way—day after day, year after year.

HHF Hydraulic Pressure Digger

Standard

Feature Specification
EngineJohn Deere 134 HP (100 kW) diesel; other makes available
Max Rotary Torque39,000 ft/lbs (52,877 Nm)
Rotary RPM0–135 RPM, variable speed
Kelly Bar3” (76.2 mm) solid; optional 4.5” (114.3 mm) internally sealed
Kelly Bar Crowd Force22,700 lbs max (28,000 with 3” bar)
Retract Force11,900 lbs max
Standard Digging Depth10’ (3.05 m) standard; optional up to 25’ (7.62 m)
Hole DiameterUp to 72” (1.83 m)
Turntable Base240 degrees
Mainframe Travel36” (914.4 mm)
OutriggersRear A-frame
Fuel CapacityOff chassis (optional 50 gallon / 189.27 L)
Basic Unit Weight14,500 lbs (6,577 kg)
Hydraulic Tool CircuitFixed 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 OptionsOther engine makes available
Digging DepthUp to 25’ (7.62 m)
Kelly Bar4.5” (114.3 mm) internally sealed
OutriggersStraight‑down rear or add front A‑frame (in lieu of rear only A‑frame)
Fuel Capacity50 gallon (189.27 L)
Polesetter PackageFixed or 6’ (1.83 m) telescoping
Service WinchMast Mount 8,000 lbs
Water Tank100 gallon poly or steel (378.5 L)
Outboard Leveling20° to 20’ (6.1 m) & 10° to 30’ (9.15 m)
PTO DrivenDriven off chassis engine
Hydraulic Hose Reel50’ (15.24 m) hydraulic hose
Auger ToolingAuger storage, adapters & extensions
Tool Boxes & StorageTunnel storage, work & safety lighting
Outrigger PadsIncluded as option
Wheel ChocksIncluded as option
Front Winches & Capstan HoistsAvailable as option
Air CompressorsAvailable as option
Generators & InvertersAvailable as option
Cab GuardsAvailable as option
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