Description
5-yr gearbox warranty
3-yr motor warranty
Lifetime shaft pull-out cover
Overview
The 7DDT is the largest two-speed drive Digga builds on a 2.5" hex shaft and the top of the loader-mounted range. It brings 6,308 ft-lbs, a 48 inch ceiling in earth and the ability to shift ranges under load, which is the combination that makes large-diameter production drilling practical on a carrier rather than an excavator. Past this point the range moves to excavator drives on bigger shafts, because the machine runs out of stability before the drive runs out of capability.
Key Features of the 7DDT 2 Speed High Flow Auger Package with Mount for 10 - 36 GPM Machines
- Torque at 3,000 PSI: 6,308 ft-lbs — as published by Digga for the 7DDT
- Max torque at 3,500 PSI: 7,344 ft-lbs — as published by Digga for the 7DDT
- Recommended flow: 10-36 GPM — check this against your machine's auxiliary circuit first
- Standard output shaft: 2.5" hex — takes A6 earth auger bits, RC6 rock and earth combo bits and DR6 dedicated rock augers
- Drills to 48" in earth and 30" in clay or shale, subject to ground conditions
- Complete package — drive, mount and linkage matched to the machine type you select
- HALO auger alignment available on every variant — a ring of red and green lights in the drive hood that guides the operator back to plumb with no spotter at the hole
- Shifts between high torque and high speed under load, without stopping or lifting out of the hole
- Case drain hose included — a two-speed motor requires a dedicated low-pressure return to tank
- 10 ft powerlead with a 2-pin connector fitted for the shift solenoid
- Fitted with an Eaton VIS motor and an integrated pressure relief valve, so no external valve block
- Extreme duty shaft locking system
- The gearbox follows the bit down the hole, so drive height is not lost from your drilling depth
- 5 year gearbox and 3 year motor warranty, plus lifetime shaft pull-out cover for drilling use
Why Buy the 7DDT as a Package
- The most drive a loader can usefully carry on this shaft — beyond the 7DDT the sensible step is an excavator-mounted drive, not a larger loader drive.
- 48 inches in earth with a shift range, the only combination in the loader lineup that offers both. Large augers are exactly where single-speed drives waste time.
- 6,308 ft-lbs at 3,000 PSI, enough that the DR6 dedicated rock augers rock auger becomes genuinely usable rather than theoretically compatible.
- Rated from 10 GPM like the rest of the two-speed range, though it will only show its full figures on a machine that can feed it properly.
- Digga supplies the 7DDT auger-only without hoses, so a bare drive is never a complete attachment. This package solves that in one line item.
Digga 7DDT Drive Specifications
| Specification | Value |
|---|---|
| Model | 7DDT |
| Drive type | Two speed, high flow |
| Torque at 3,000 PSI | 6,308 ft-lbs |
| Max torque at 3,500 PSI | 7,344 ft-lbs |
| Recommended flow | 10-36 GPM |
| Max pressure — do not exceed | 3,500 PSI at 27 GPM |
| Max flow — do not exceed | 53 GPM at 1,800 PSI |
| Max horsepower | 55 HP |
| Motor type | Orbital Geroler |
| Pressure relief valve | Included |
| Standard output shaft | 2.5" hex |
| Recommended auger bits | A6 / RC6 / DR6 |
| Max drilling diameter — earth | 48" |
| Max drilling diameter — clay / shale | 30" |
| Case drain | Required — hose supplied with the drive |
| HALO auger alignment | Optional — select it on this page |
| Carrier weight range | 4.5-8T (9,900-17,600 lbs) |
Every figure above is published by Digga for the 7DDT. Maximum drilling diameter depends on ground conditions and is a guide rather than a rating.
7DDT Package by Machine Type
| Machine type | Mount packages on this page | What the package includes |
|---|---|---|
| Skid Steer / Compact Track Loader | Universal Quick Attach Frame Package, or Extension Frame (TPE) Package | Drive, 7 ft hoses, flush-face quick disconnects, universal skid steer mount and linkage |
| Excavator, 4.5-8T (9,900-17,600 lbs) | Single Pin Mount, or Double Pin Mount | Drive, excavator mount and linkage. Hoses and disconnects ordered separately so length matches your boom |
| Backhoe Loader | Backhoe Mount | Drive, backhoe cradle, linkage and pin |
Choosing Your Mount Package
- Universal Quick Attach Frame Package — the standard skid steer frame and linkage. The drive hangs at machine reach and this is the right answer for most drilling on a loader.
- Extension Frame (TPE) Package — Digga's telescopic piling and drilling extension replaces the fixed frame so the drive travels down past machine reach. Bought for piling and deep footings, where it removes the need for a bit extension and the alignment loss that comes with one.
- Single Pin Mount — the drive hangs from one pin on the dipper and finds vertical under its own weight. The usual choice for plumb holes on reasonably level ground.
- Double Pin Mount — two pins fix the drive to the dipper so the boom sets its angle. Choose it for angled holes, for work across a slope, and wherever the drive must be held deliberately off vertical.
- Backhoe Mount — a cradle with linkage and pin that carries the drive from a backhoe boom, a different part from either excavator mount.
Pin diameter varies by machine. Enter your make and model with the order and we confirm the mount against your boom before the package ships.
What Comes in the 7DDT Package
- Digga 7DDT high flow auger drive
- Mount and linkage for the machine type and mount package you select
- 7 ft hydraulic hoses with flush-face quick disconnects on the skid steer packages
- Case drain hose, required on every two-speed drive
- 10 ft powerlead with a 2-pin connector for the shift solenoid
- HALO auger alignment system with extension cable and in-cab 12V plug, where the HALO variant is selected
- Not included: auger bits, hoses on the excavator and backhoe packages, and the plug-and-play controller kit needed to shift the drive from the cab
Which Machines Fit the 7DDT Package?
Fitment is decided by auxiliary hydraulic flow and by how the drive attaches to your machine — not by brand. The 7DDT needs at least 10 GPM to reach the torque published above.
| Fitment factor | Requirement |
|---|---|
| Auxiliary hydraulic flow | 10-36 GPM — 10 GPM minimum to reach rated torque |
| Circuit type | High flow auxiliary circuit; this is not a standard-flow drive |
| Circuit pressure | Rated for 3,500 PSI machines |
| Skid steer mount | Universal quick attach, included with the skid steer packages |
| Excavator mount | Single or double pin, included. Pin diameter confirmed against your machine before shipping |
| Backhoe mount | Cradle with linkage and pin, included with the backhoe package |
| Case drain | Required — hose supplied; your machine needs the return line available |
| Electrical | 12V for the shift solenoid, and for HALO if selected |
| Auger bits | Sold separately — A6, RC6 and DR6 bits with a 2.5" hex hub |
On a skid steer or compact track loader the package mounts on the universal quick attach interface used across these brands:
Bobcat
Caterpillar
John Deere
Case
New Holland
Takeuchi
Kubota
Gehl
Everything needed to confirm fitment is on this page — add the 7DDT package to your cart to see delivered pricing for your address. Enter your machine make and model with the order and we check the mount before it ships, coming back to you only if something needs changing.
On delivery: inspect the crate before you sign for it. Note any damage on the bill of lading at the time of delivery — a clean signed bill of lading makes a carrier claim much harder to win. Photograph anything that looks wrong and email support@eskidsteer.com.
7DDT 2 Speed High Flow Auger Package with Mount for 10 - 36 GPM Machines Questions, Answered
When should I use high speed rather than high torque?
Low speed and high torque for large diameters and fracturable rock, where turning force decides whether the bit advances. High speed and low torque for small diameters, soft ground, and spinning spoil clear of the flights on the way out — which is where most of the time saving across a day actually shows up.
Is the 7DDT too much drive for my loader?
If the machine cannot supply enough flow, the drive will underperform rather than break. The more common limit is weight and reach: at 48 inches of auger diameter, a loader needs the counterweight and the lift to handle a full flight of spoil. If your machine struggles with a loaded 36 inch auger today, the answer is a bigger carrier, not a bigger drive.
Which mount package do I need for the 7DDT?
Skid steer and compact track loaders take the universal quick attach frame, or the telescopic extension frame if you are piling. Excavators in the 4.5 to 8 tonne class take a single pin mount for plumb holes or a double pin mount when the boom needs to set the angle. Backhoe loaders take the backhoe cradle. All five are selected on this page and arrive fitted to the drive.
Are auger bits included with the 7DDT?
No. Bits are ordered separately so the diameter matches the hole rather than the drive. The 7DDT runs a 2.5" hex output shaft, which takes the A6 earth auger bits for general drilling, the RC6 rock and earth combo bits where ground is mixed, and the DR6 dedicated rock augers for fracturable rock and shale.
Does the 7DDT need a case drain?
Yes. A two-speed motor releases internal case pressure as it shifts, and without a dedicated low-pressure return to tank that pressure builds against the shaft seal until it fails. Digga supplies the case drain hose with the drive; the return line has to be available on your machine.
Is the shift controller included?
No. The drive ships with a 10 foot powerlead and a 2-pin connector fitted, and the cab controller is a separate item. Plug-and-play kits with a rocker switch and 12V lead come in 10, 20, 40 and 50 foot harness lengths, with joystick-mounted toggle and floor-mounted foot switch options available in place of the rocker switch.
What does HALO do, and is it worth adding?
Every mount package on this page is offered two ways: No HALO, or Include HALO Auger Alignment System. HALO is a ring of red and green lights built into the hood of the drive that tells the operator when the drive is plumb, fore and aft and left to right. It replaces the second person standing at the hole calling the auger straight. On a one-person crew, or on work where holes are inspected for plumb, it pays for itself quickly. HALO drives come with an extension cable and an in-cab 12V plug as standard.
What warranty comes with the 7DDT?
Five years on the gearbox and three years on the motor for drilling use, plus a lifetime shaft pull-out warranty, subject to maintenance per the operator's manual. Digga treats anchoring separately: a DDS or DDT drive used for screw anchoring needs an Energy Control Valve fitted for the warranty to stand.
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