Load loose bulk material with separate supporting and closing ropes. A four-rope clamshell grab is selected together with its crane or hoist arrangement: the ropes, bucket volume, grab self-weight and maximum material load must all fit the lifting system. Send the cargo density and your pickup and discharge geometry before choosing a model.
Send the cargo name, measured bulk density, largest lumps, moisture, target tonnes per hour, crane drawing and available opening and discharge space.
The selected attachment's minimum order and supply scope are confirmed in the written offer.
Review the loaded attachment, connection, operating cycle and site clearances before approval.
Agree inspection, documents, packing, schedule, site support and warranty before order placement.
Each example keeps bucket volume, material density, material mass and crane rating together. Compare complete configurations; figures from different rows must not be combined for one grab.
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| Model | Crane rating | Bucket volume | Material density | Listed material per grab | Rope / close time |
|---|---|---|---|---|---|
| U3 | 5 t | 2.5 m³ | >0.5 to 1 t/m³ | 1.25–2.5 t | Ø14 mm / 8 s |
| U115 | 10 t | 1.5 m³ | 2.5–3.3 t/m³ | 3.75–4.95 t | Ø19.5 mm / 18 s |
| UP1095 | 10 t | 9.5 m³ | 0.63 t/m³ | 5.9 t | Ø20–24 mm / confirm cycle |
The material figure is cargo inside the bucket, not grab self-weight. The selected crane must carry the grab plus the maximum cargo and applicable rigging. Confirm grab mass, rope layout, open width, dimensions and duty on the approved unit drawing.
| Model | Rope / sheave arrangement | Outline dimensions |
|---|---|---|
| U3 | Ratio 3; Ø350 mm sheave | H 2,985 / D 3,200 mm |
| U115 | Ratio 6; Ø500 mm sheave | H 3,490 / D 2,920 mm |
| UP1095 | 2 support + 2 closing ropes; ratio 4 | H 3,620 mm; opening 4,075 mm |
H and D are outline labels. Use the approved unit drawing for installation clearances, opening width and building work.
No. The grab itself consumes part of the crane's capacity. For each proposed bucket, add its confirmed self-weight to the maximum expected cargo mass, then check the total against the crane and rope arrangement at the actual duty.
Review the configuration
Choose shell shape and bucket volume from bulk density and expected filling. Include dust control, hopper opening and discharge clearance in the layout.
A smaller bucket may already reach the allowed lifted mass. Check lump size, wear protection, closing force and the total suspended load.
Set the required tonnes per hour against travel distance, lift height, close/open time and real operating hours. A larger nominal bucket does not guarantee a faster plant cycle.
A four-rope bucket needs a crane arrangement that can operate its support and closing functions; replacing a plain hook is not enough. For a complete crane, compare the site's grab overhead crane range. Compare the matching crane system.
Choose bucket volume, shell profile and four-rope rigging together for the cargo density, lump size and required cycle rate. The selected drawing should state grab self-weight, maximum filled load, rope paths and pickup-to-discharge clearances.
Equipment price, crane modifications and site services should be separated so your team knows what is supplied and what remains to be done locally.
Identify the selected shells, cutting edges, rope head, sheaves and wear components. State the actual grab self-weight and open/closed dimensions.
List rope diameter, support/closing arrangement, reeving, hook or head connection, allowable lift height and control responsibilities.
Set out drawings, factory checks, packing, spare parts, commissioning support and the tests required at the destination.
The offer should connect your load data to one drawing, one equipment schedule and a clear inspection and handover plan. Production and freight dates are confirmed for that selected configuration.
List the destination standards and customer witness points before finalising the acceptance plan.
Confirm load, crane interface, environment, operating sequence and buyer requirements.
Approve dimensions, self-weight, selected components, controls and site responsibilities.
Complete the agreed functional and load-case checks, records and packing.
Coordinate transport, unloading, installation checks, operator instruction and handover.
Single-unit enquiries are welcome. The written offer confirms the selected design's minimum order and exactly what is supplied.
State applicable market and customer requirements. The offer lists the documents, inspections and tests available for the selected unit.
Drawing approval, production, inspection and shipping are separate milestones. A dated delivery programme follows the selected configuration.
Agree the warranty period and start date, covered components, replacement parts, installation guidance and any on-site service in the signed offer.
Ask for support termsAssign who supplies power, rope, hook connection, controls, rigging and commissioning equipment.
Agree inspection and functional checks around the material and lift the attachment was selected for.
Record the final model, serial number and wear parts so replacement components fit the supplied configuration.
Use a two-rope clamshell where one rope supports the bucket and the other closes it, subject to the selected crane arrangement.
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An electric or motor-driven clamshell closes under powered control instead of relying only on a separate closing-rope drum.
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Curved tines close around long, irregular pieces that a two-shell bucket may not capture consistently.
View product ↗Use these answers to prepare one technical and commercial brief for the selected unit.
Discuss this attachmentStart with measured cargo density and the tonnes needed per cycle. Compare the complete model rows, then verify grab self-weight, crane rating, rope arrangement and hopper clearances on a selected-unit drawing.
Only after the lifting, support and closing functions are engineered. Provide the crane's hoist and rope drawings; a hook rating alone does not establish four-rope compatibility.
No. The listed UP1095 example pairs 9.5 m³ with 0.63 t/m³ material and 5.9 t cargo. Actual fill and material density must be checked for the project.
Send the existing crane rating, rope dimensions, lift height, stockpile and hopper drawings, available open width, material density and desired throughput.
Possibly, but each cargo changes fill, load and wear. List every material and its density range so the heaviest and most abrasive operating cases can be checked.
Send the cargo name, measured bulk density, largest lumps, moisture, target tonnes per hour, crane drawing and available opening and discharge space. The selected drawing and commercial offer can then identify the attachment, crane interface, documents, delivery and support.
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