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Ground Hog HD99 Hydraulic Earthdrill
- $1,965.00
- Brands Ground Hog
- Product Code: HD99-H
- Availability: In Stock
Ground Hog HD99 Hydraulic EarthdrillProduct OverviewThe Ground Hog HD99 Hydraulic Earthdrill is a towable, one-person earth drilling machine designed for demanding post-hole and soil-drilling applications. Instead of transferring the drilling torque directly through the operator's hands, the HD99 uses a hydraulic drive system to separate the engine from the auger. This substantially reduces the ki..
HD99 Hydraulic Earthdrill Auger for Heavy Duty Drilling
Ground Hog HD99 Hydraulic Earthdrill
Product Overview
The Ground Hog HD99 Hydraulic Earthdrill is a towable, one-person earth drilling machine designed for demanding post-hole and soil-drilling applications. Instead of transferring the drilling torque directly through the operator's hands, the HD99 uses a hydraulic drive system to separate the engine from the auger. This substantially reduces the kickback normally associated with hand-operated earth drills and makes the machine easier to control during drilling.
The HD99 is Ground Hog's high-capacity earthdrill and can operate with Ground Hog augers up to 18 inches in diameter. Hydraulic drive provides variable auger speed and reverse rotation, which is particularly useful when an auger needs to be backed out of difficult soil or becomes temporarily stuck.
Key Features
Hydraulic one-person earthdrill for professional drilling applications
Towable design for convenient transportation between job sites
Hydraulic drive provides variable auger speed
Forward and reverse auger rotation helps free a stuck auger
Designed to handle augers up to 18 inches in diameter
Three handlebar positions for standard drilling, close-up drilling, and towing
Pivoting drilling head helps accommodate uneven terrain
Engine frame swivels to help keep the engine level during operation
Right-angle hydraulic design helps reduce drilling torque transmitted to the operator
Large 5.70 × 8 pneumatic highway-rated tires
2-inch hitch coupler and tow bar
Replaceable steel bushings at pivot points
Powder-coated finish for durability
Hydraulic components use Parker components
Designed for relatively low routine maintenance
Product Specifications
| Specification | Details |
|---|---|
| Brand | Ground Hog |
| Model | HD99 |
| Product Type | Hydraulic Earthdrill |
| Configuration | One-person, towable |
| Power System | Hydraulic |
| Engine | Gasoline engine |
| Engine Options | Honda or Subaru, depending on configuration |
| Engine Power | Approximately 9 HP |
| Maximum Auger Diameter | 18 in |
| Auger Speed | Approximately 140 RPM at 3,600 engine RPM, no load |
| Auger Rotation | Variable-speed forward and reverse |
| Hydraulic Pump | 6 GPM |
| Hydraulic Fluid Reservoir | 3 gal |
| Hydraulic Components | Parker |
| Handlebar Positions | 3 |
| Tires | 5.70 × 8 pneumatic highway-rated |
| Hitch Coupler | 2 in |
| Towable | Yes |
| Finish | Powder coated |
| Auger Included | Configuration-dependent; verify listing |
| Primary Application | Soil and post-hole drilling |
Published sources identify both Honda- and Subaru-powered HD99 configurations. Current listings specifically identify an HD99-H with a Honda GX270, while other product descriptions refer more generally to a 9 HP Honda or Subaru engine. For that reason, the engine is listed by configuration rather than assuming one engine specification applies to every HD99.
Hydraulic Drive System
The HD99's hydraulic drive is one of its main advantages. Rather than connecting the engine directly to the auger through a conventional mechanical transmission, hydraulic power is used to drive the drilling head.
The system allows the operator to adjust auger rotation speed according to digging conditions and provides reverse rotation when necessary. This is especially useful when an auger encounters difficult soil or needs to be backed out of a hole.
The hydraulic system is also designed to require relatively little routine maintenance. Typical service involves checking or changing the hydraulic fluid and engine oil and replacing the hydraulic filter as required. The HD99's reservoir holds approximately 3 gallons of hydraulic fluid and is shaped with additional surface area to help dissipate heat.
Reduced Operator Torque
A major benefit of the HD99 is the way its hydraulic and right-angle design manages drilling torque. Conventional hand-operated earthdrills can transmit substantial kickback through the handlebars when the auger encounters resistance.
The HD99 separates the engine from the auger through the hydraulic system, greatly reducing the digging torque normally felt by the operator. Ground Hog also designed the machine to be approximately balanced with an 8-inch auger installed, helping make the earthdrill easier to maneuver.
Three Handlebar Positions
The HD99 incorporates three handlebar positions to make the machine more adaptable to different working conditions.
Two positions are intended for normal drilling, while another position allows the operator to work closer to obstacles such as walls and fences. The alternate position can also be used when maneuvering or towing the earthdrill.
This arrangement is particularly useful for contractors working on residential properties where access around existing structures can be limited.
Pivoting Drilling Head
The drilling head can pivot from side to side, allowing the HD99 to better accommodate uneven ground. This feature helps the operator position the auger more effectively when working on terrain that is not perfectly level.
The engine frame also swivels to help keep the engine level while the machine is being operated. Maintaining an appropriate engine position is important for reliable engine performance when working on varying terrain.
Towable Design
The HD99 is built as a towable earthdrill, allowing it to be transported behind a suitable towing vehicle rather than requiring a separate equipment trailer for every job.
It uses large 5.70 × 8 pneumatic highway-rated tires and is equipped with a tow bar and 2-inch hitch coupler. When transporting the machine, users should follow applicable towing regulations and the manufacturer's instructions for securing the earthdrill.
Auger Compatibility
The HD99 is designed to work with Ground Hog augers up to 18 inches in diameter, providing a wide range of hole sizes for different applications. The machine uses the standard Ground Hog auger system, with available augers ranging from smaller post-hole sizes through larger 18-inch configurations.
Depending on the particular product package, the earthdrill may be supplied without an auger or with a specified auger. Always confirm the included accessories with the seller before purchase.
Typical Applications
The Ground Hog HD99 is suitable for professional applications such as:
Fence-post installation
Agricultural projects
Landscaping
Sign installation
Deck and structural post preparation
Utility-related drilling
Commercial property work
Residential post-hole projects
Contractor applications
Rental equipment operations
Its ability to work with large-diameter augers makes it particularly useful when a compact, towable earthdrill is preferred over a larger excavator or skid-steer attachment.
Durable Construction
The HD99 is designed for regular professional use and incorporates several features intended to improve long-term durability. Hydraulic components are sourced from Parker, while replaceable steel bushings are used at pivot points to help simplify wear maintenance. The machine also features a durable powder-coated finish.
The combination of a hydraulic drive, robust pivoting structure, and towable chassis provides a practical balance between drilling capability and job-site mobility.
Maintenance
Compared with a complex mechanical drive system, the HD99's hydraulic system is designed with relatively straightforward routine maintenance requirements. Regular checks generally focus on:
Hydraulic fluid level and condition
Hydraulic filter
Engine oil
Engine maintenance according to the engine manufacturer's schedule
Pivot-point bushings and related hardware
Tires and towing components
Auger attachment and cutting components
Following the manufacturer's maintenance schedule is important for safe operation and long equipment life.
Why Choose the Ground Hog HD99?
The Ground Hog HD99 Hydraulic Earthdrill is designed for users who need more capability than a conventional hand-held earth auger while still wanting a relatively compact and maneuverable machine.
Its combination of hydraulic variable-speed drive, forward/reverse rotation, reduced operator torque, 18-inch maximum auger capacity, pivoting drilling head, and towable chassis makes it a versatile solution for demanding post-hole drilling.
Ideal For
Professional fencing contractors
Landscapers
Agricultural users
General contractors
Utility installers
Property maintenance companies
Equipment rental businesses
Users requiring large-diameter post holes
Important Safety Note
The HD99 is a powerful earth-drilling machine and should only be operated by users who have read and understood the manufacturer's operating and safety instructions. Buried utilities, rocks, and other underground objects can create serious hazards. The manufacturer specifically instructs operators to identify buried electrical, gas, water, and other utilities before drilling.
The Ground Hog HD99 is best suited to soil drilling and should be used only for applications and configurations approved by the manufacturer.