HH6K Torque Head

Lightweight for confined spaces

Compact powerful lightweight torque heads for difficult-to-access jobs

Digga’s HH6K lightweight screw pile torque head is designed for confined spaces and low headroom sites, making it ideal for applications such as crawl spaces, subfloor underpinning, and other restricted-access areas. The compact (yet powerful) drive can be powered by portable hydraulic power packs and ensures efficient and precise screw pile installation in challenging environments.

Engineered with an innovative low-maintenance gearbox, the HH6K screw pile torque head delivers exceptional reliability and performance. Featuring a Digga/Danfoss hydraulic motor with built-in pressure relief valve, it provides consistent power and durability. Manufactured in Europe, with factory-backed warranty, the HH6K is a versatile high performance solution for difficult-to-access jobs where traditional equipment is not suitable.

Speeds

Single Speed

Halo Alignment System

Not Available

Machine Suitability

Portable Hydraulic Power Packs

Optimum Torque Range

6000Nm-8000Nm

Ideal Use

House foundations

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Specifications

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Operator’s Manuals

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About Screw Anchor Drives

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FAQs

Features

Lightweight. Compact and powerful.

Advanced Two-Piece Drive Shaft. Isolates planetary gears from dynamic axial load.

Integrated Pressure Relief Valve. Safeguards the motor.

High Performance Solution. Suited for difficult-to-access worksites.

Specifications

Digga planetary drives are specially designed for foundation and screw piling, as well and setting ground anchors.

Machine Size Suitability Portable Hydraulic Power Packs
Nominal Torque (Theoretical)8850Nm at 145bar
Nominal Torque (Expected)6460Nm at 145bar
Pressure ValveIncluded
Energy Control ValveIncluded
Overall Length500mm
Diameter240mm
Weight (Without Frame)40kg
Standard Output Shaft50.8mm Hex
Maximum Pressure145bar at 57lpm
Maximum Flow57lpm at 145bar
Maximum Power15Kw (20hp)
Swing ControlNot Applicable
DiggalignNot Applicable
Halo AvailableNot Applicable

Frames

A frame to operate Digga's HH6K screw anchor drive is not included, and will have to be supplied by the customer.

Energy Control Valve (ECV)

Digga's Energy Control Valve (ECV) protects hydraulic motors during screw piling by controlling rotational energy kickback, preventing motor damage and costly repairs. It easily converts any Digga auger drive into a dedicated screw anchor drive, and is standard on all Digga anchor drives. Ideal for screw piling and anchoring.

Pressure Differential Gauge

Our Differential Pressure Gauge uses transducers located within the drive unit to calculate actual pressure received to the power-head. The calculation is achieved by measuring the pressure from the feed line and subtracting the back-pressure in the return line. The differential pressure is then displayed in the operator’s cab. The operator can cross-reference the displayed figure with the supplied torque chart, to determine the theoretical output torque of the drive unit. To suit anchor drives (6,000 to 500,000 Nm).

Pressure Relief Valve (PRV)

Eliminates the need for a bulky and expensive valve block.

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LEARN MORE ABOUT TORQUE HEADS

From understanding the different types of torque heads available, to learning about components and maintenance, we hope you find this information helpful.

Learn more about screw anchor drives.

FREQUENTLY ASKED QUESTIONS [FAQS]

Do you sell screw piles?

Digga does not manufacture Screw Piles. Screw Piles are designed and manufactured to meet specific engineered foundation requirements. As such a screw pile is required to be a certified foundation pile to meet the stringent building codes of most countries worldwide.

Digga’s forte lies in the manufacture of the Hydraulic Drive Tool for the effective installation of the screw Pile to meet with the specific torque requirements of the individual screw pile. These torque requirements can be from as low as 1000Nm up to a massive torque requirement of 500,000Nm. Digga has a drive head to meet all your torque requirements.

How do I install screw piles?

A screw-pile comprises a circular hollow section of steel shaft with one or more helical plates welded near to the end of it. The size of the shaft (diameter, wall thickness and length), combined with the size and placement of the helical plate are Engineer designed to take full advantage of the available soil capacity. Screw-piles are screwed into the ground like a self-tapping screw using rotary hydraulics, namely DIGGA SCREW/ANCHOR DRIVES, attached to earthmoving equipment to a specified torque capacity and a depth as directed by a certified foundation engineer.

Why do I need an ECV (Energy Control Valve), aka, Swoosh Valve

Digga torque head unit's output torque is used to screw the pile into the ground. As the anchor reaches the desired compression torque or depth the operator stops. At this point the pile (or anchor) is under load.

When the operator stops, the load is trying to spin the pile backwards. While the anchor is only tensioned to say a ¼ or ½ a turn when it releases it does so in under 1/10 of a second. This motion can have dire effects on both the gearbox and the motor as it sends reverse energy back up into the drive unit. This motion effectively turns the reduction gearbox into a multiplier, essentially turning the hydraulic motor into a pump.

Swoosh Control (ECV) was designed to relieve the kick/flick back motion of the pile on the drive head. Basically, it prevents a pile of kickback/flick back by controlling the release of oil to the low-pressure side of the motor. The added benefit of the design is that it does not reduce the power available to the drive when the drive is installing the anchor. Its name came about as when the valve is working you can hear the controlled release of oil. A very gentle Swooossshhhhh... sound is heard.

When is a Swoosh Valve (ECV Valve) needed on an anchor drive?

Swoosh (ECV) is required for all drives used installing screw piles from PD4HF – PD50 to maintain a full gearbox and motor warranty (3yr Gearbox & 2yr Motor).

Should you be installing screw piles with a torque requirement up to 16,000Nm (12,000Ft/Lbs.) and do not have an ECV fitted you will have limited warranty (2yr Gearbox & 1yr Motor).

Using drive units without ECV for installing screw piles with an installation torque requirement of greater than 16,000Nm (12,000Ft/Lbs.) will have NO WARRANTY for Gearbox or Motor.

What size torque head do I need to do a screw piling or screw anchoring job?

This will be determined by the maximum torque requirement of the specific screw piles that will be installed at the site in question. This in turn will be specified by the foundation engineer who has designed and designated the exact dimension, installation and torque requirement for this job site.

What size machine do I need to do screw anchoring, and does machine size matter?

This will be determined by the maximum torque requirement of the specific screw piles that will be installed at the site in question. This in turn will be specified by the foundation engineer who has designed and designated the exact dimension, installation and torque requirement for this job site.

Does the RPM speed change when I use larger drive units that have more torque?

Dependent on the available flow and pressure available from the parent machine there will be a variation in the RPM speed of a smaller drive to a larger drive.

e.g. With the same parent machine with flow 200Lpm fitted with a SD45 would have 17 RPM at max torque, as opposed to same machine with same flow fitted with a SD95 would have 8 RPM at max torque. So, a definite flow decrease the larger the drive.

It is worth noting, speed (RPM) is dependent on Flow (LPM or GPM). Power (Nm or Ft/Lbs.) depends on pressure (BAR or PSI).

If I get a drive unit for screw anchoring, can it also be used for auger drilling as well?

Yes, all drives are capable of use in screw piling and as an auger drive. Larger drives with higher torques will be limited by the RPM that will satisfy your drilling requirements.

Can my 1.7t do screw piles?

Yes, but the size of the screw pile would be limited by the amount of torque required so that the machine is not compromised and is not at risk of boom failure or machine tipping. Best to confirm with the parent machine supplier of the safety factors for the machine in question.

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