Moving heavy stone slabs safely in a yard or shop environment is one of the most consequential operations a stone business performs every day. The Aardwolf DFB2-5000 Double Forklift Boom is a purpose-engineered lifting attachment that converts a standard forklift into a versatile overhead lifting machine — enabling stone yards to handle slabs, bundled stone packs, and heavy equipment loads that a standard forklift carriage cannot reach or safely manage. This guide covers everything stone fabricators and yard managers need to know about the DFB2-5000: how it works, how to rig it correctly, and how to use it safely in a busy stone handling environment.
What Is the Aardwolf DFB2-5000 and Why Does a Stone Yard Need One
The Aardwolf DFB2-5000 is a double-jib forklift boom — a steel boom assembly that slides onto a forklift's existing fork carriage and transforms the machine from a horizontal-push material handler into a vertical-lift crane. The double-jib design features two parallel boom arms extending forward from the carriage mount, providing superior load stability and a higher working load limit than single-jib alternatives.
In a stone yard context, the forklift boom solves handling problems that a bare forklift cannot address. Standard forklift forks push under pallets and stone A-frames from below — but many stone handling tasks require lifting from above, particularly when repositioning slabs that are already vertical in an A-frame rack, when loading stone bundles onto a truck flatbed where the load cannot be approached from the side, or when picking a single slab out of the middle of a stack without disturbing adjacent pieces. The DFB2-5000's overhead hook system makes all of these operations practical with equipment the stone yard already owns.
Stone yards that add a forklift boom to their existing forklift fleet effectively gain a mobile gantry crane capability without the fixed infrastructure investment of a dedicated overhead crane system. The boom attaches and detaches in minutes and can be moved between yard areas as the workload demands — a flexibility that fixed cranes cannot match.
Load Capacity and Working Load Limits
The DFB2-5000 designation reflects the unit's rated working load limit of 5,000 kg (5 metric tons / approximately 11,000 lbs). This capacity is the maximum load that can be safely suspended from the boom hook under the conditions specified in the manufacturer's load chart.
A critical concept when using any forklift boom is the de-rating of the base forklift's capacity due to the load center shift. When a boom is attached to a forklift carriage, the load hangs from the hook at a horizontal distance forward of the forklift's front axle — often significantly further forward than the rated load center distance of the forklift itself. This shifts the load center outward and reduces the effective safe working capacity of the combined forklift-plus-boom system below both the boom's rated limit and the forklift's rated limit.
Always consult the forklift's load capacity chart for the specific load center distance at which you are operating the boom, and never exceed the lower of: the boom's 5,000 kg rating or the forklift's rated capacity at the actual working load center. Operating a forklift boom without accounting for this de-rating is a serious safety error that has caused fatal accidents in material handling operations across many industries. Aardwolf provides a load chart with the DFB2-5000 — read it before the first lift and keep it accessible to all operators.
In stone yard practice, the most common loads on a forklift boom are individual granite or quartzite slabs (typically 300–800 kg each), bundled slab packs (can exceed 2,000 kg), and heavy fabrication equipment such as bridge saws and waterjet tables during shop setup or relocation. All of these are well within the DFB2-5000's 5,000 kg capacity when operated with a properly sized forklift, but the load center de-rating calculation must be performed for each specific lift configuration.
Forklift Compatibility and Attachment Setup
The DFB2-5000 is designed to fit standard ISO forklift fork carriage dimensions. Before purchase, confirm that your forklift's fork carriage width and fork cross-section dimensions are compatible with the boom's mounting pocket specifications. Most industrial forklifts in the 3,000–8,000 kg capacity class use compatible standard carriage dimensions, but compact warehouse forklifts and rough-terrain telehandlers may have non-standard fork sections that require a compatibility check.
Attachment is straightforward: remove or fold the forklift forks out of the way (or the boom's mounting pockets slide over the existing forks), slide the boom mounting pockets onto the fork carriage, and secure with the locking pins provided. Two operators working together can typically attach the DFB2-5000 in under 10 minutes. The double-jib design ensures the boom is self-leveling on the carriage without requiring precise fork spacing adjustment — an advantage in busy yard conditions where setup time matters.
The hook position on the DFB2-5000 is adjustable along the boom length, allowing the operator to position the lifting hook at different horizontal distances from the mast. Shorter hook positions reduce the load center distance and allow the full rated capacity to be used; longer hook positions increase reach but require the de-rated capacity at the extended load center to be observed strictly. Always set the hook at the minimum distance that achieves the required reach for each specific lift.
Rigging Stone Slabs and Slab Packs
A forklift boom is only as safe as the rigging connecting the load to the hook. In stone yard operations, rigging selection is critical because stone slabs present particular challenges: they are heavy per unit area, their edges are sharp and can cut rigging material, they often have no built-in lifting points, and an uncontrolled swing or drop can cause fatal injury and catastrophic stone damage.
The correct rigging for stone slab lifting depends on whether the slab is vertical (in an A-frame rack) or horizontal (flat on the yard floor or on a truck bed).
Horizontal slab lifting: Use rated lifting slings — nylon web slings or polyester round slings in a basket hitch configuration under the slab. The sling basket passes under the full width of the slab at two points, and both sling eyes are hooked to the boom hook or to a spreader bar hanging from the hook. The angle of the sling legs relative to vertical affects the tension in each leg: at 60 degrees from vertical, each sling leg carries 115% of the half-load (effectively double the apparent sling tension). Use slings rated for the actual tension load at the working angle, not just the total load weight.
Vertical slab lifting (from A-frame): Attach a stone clamp — a purpose-made mechanical clamp that grips the slab edge when load is applied — to the slab at the balance point. Stone clamps rated for the specific slab weight must be used; general-purpose clamps not rated for stone may slip on polished surfaces. The Aardwolf product range includes compatible stone clamps and vacuum lifting accessories that pair effectively with the DFB2-5000 boom for vertical slab handling.
Never use chain or wire rope in direct contact with polished stone surfaces — they will damage the finish. Where chain or wire rope is part of the rigging system, use rubber-lined chain saddles or sling protectors at the stone contact points. Nylon and polyester web slings are the preferred direct-contact rigging for polished decorative stone.
Safe Operating Practices in a Stone Yard
Forklift boom operations in a stone yard environment require a defined safe working procedure that all operators follow consistently. The following practices reflect industry best practice for stone material handling with forklift boom attachments.
Exclusion zone: Establish a minimum exclusion zone of 1.5 times the suspended load height around any active lift. No personnel should be within this zone while a load is suspended from the boom hook. Designate a spotter who maintains visual contact with both the operator and the load, and who has clear authority to stop the lift if a safety concern arises.
Travel with load elevated: Never travel with a suspended stone load at elevated height. If the stone must be moved horizontally, lower the load to within 300 mm of the ground before traveling, move slowly (walking pace or slower), and travel on the flattest available route. Suspended loads at height shift the forklift's center of gravity dramatically and create tip-over risk on any uneven surface.
Pre-lift weight verification: Before lifting any load, verify the estimated weight against the combined forklift-boom capacity at the working load center. If the weight is unknown, start with a partial lift (raise the load 50 mm and check forklift stability before continuing) rather than committing to a full lift of an unknown load. Stone density varies by species and thickness; a slab that appears manageable may be significantly heavier than visually estimated.
Inspection before each use: Inspect the DFB2-5000 before each shift for cracks in the boom welds, deformation of the jib arms, wear or damage to the hook and hook latch, and integrity of all attachment pins and locking mechanisms. Remove any boom with visible structural damage from service immediately. Aardwolf recommends a formal documented inspection by a competent person at least annually regardless of use frequency.
Maintenance and Storage of the DFB2-5000
Proper maintenance of the DFB2-5000 protects both the equipment investment and the safety of every future lift operation. The maintenance requirements are minimal for a piece of steel lifting equipment, but they must not be neglected.
After each use in wet or dusty yard conditions, wipe down the boom surfaces and inspect the hook latch spring for debris that could prevent the latch from fully engaging. Lubricate the hook swivel bearing and latch mechanism with a light penetrating oil every 30 days or after exposure to rain or washing operations. If stone dust or silica buildup is found in the hook mechanism, clean with compressed air before lubricating — packed dust can jam the latch mechanism and prevent it from closing under load.
Store the DFB2-5000 in a covered, dry location when not in use. Prolonged outdoor storage without cover will accelerate corrosion of unpainted surfaces, particularly at welds and the hook assembly. If outdoor storage is unavoidable, apply a rust-preventive coating to all bare metal surfaces and cover the hook and rigging attachment point with a weatherproof cap.
Keep the load rating plate and serial number tag on the boom clean and legible at all times. Safety inspectors and insurance auditors will check that the rated capacity is visible on the equipment — a missing or illegible tag is a compliance deficiency that may require the equipment to be taken out of service until the tag is replaced by the manufacturer.
Where to Get the Aardwolf DFB2-5000
The Aardwolf DFB2-5000 Double Forklift Boom is available through Dynamic Stone Tools, your professional source for stone handling and fabrication equipment in North America. Aardwolf is one of the industry's most respected manufacturers of stone lifting and handling equipment, and the DFB2-5000 is backed by Aardwolf's engineering standards and warranty program.
Dynamic Stone Tools stocks Aardwolf lifting equipment and can provide compatibility guidance for your specific forklift model before purchase. Ordering through a specialist supplier rather than a general industrial catalog ensures you receive correct product selection advice and access to technical support if questions arise after delivery. For fabricators equipping a new stone yard or upgrading an existing operation, the DFB2-5000 is one of the highest-impact equipment additions available — it multiplies the utility of a forklift you already own at a fraction of the cost of a dedicated overhead crane installation.
Visit the Aardwolf DFB2-5000 product page at Dynamic Stone Tools for current pricing, specifications, and availability. For questions about forklift boom selection, load capacity calculations for your specific forklift, or compatible rigging and stone clamp options, contact the Dynamic Stone Tools team directly — we're here to help stone professionals spec the right equipment for their operation. You can also browse the full material handling equipment range at Dynamic Stone Tools for complementary stone yard lifting and transport solutions.
Add the Aardwolf DFB2-5000 to Your Stone Yard
Transform your existing forklift into a full overhead lifting system. The DFB2-5000 handles slabs, bundles, and heavy equipment with a 5,000 kg working load limit.
View the DFB2-5000