POWERED CLOSING / BULK MATERIAL

Electric Motor Clamshell Grab Bucket

An electric or motor-driven clamshell closes under powered control instead of relying only on a separate closing-rope drum. The selected grab must still fit the crane's lifting interface and electrical system. Specify the handled material, duty, available power, cable route and outdoor exposure together, then confirm the bucket's own mass and cargo load.

Red two-jaw clamshell grab with visible frame and wide open shells — Two-jaw clamshell bucket form01 / 01

CLOSING: Powered mechanism
EXAMPLES: U5D / ZD20
POWER: Selected-unit supply
ORDER BASIS: Integrated crane package

Powered closing actionPower and cable route matter

Request a configured quote View specifications

Send material density and maximum lump size, crane rating, power supply, cable travel, pickup and discharge drawings and the number of cycles per hour.

One-unit enquiries welcome

The selected attachment's minimum order and supply scope are confirmed in the written offer.

Crane and attachment checked together

Review the loaded attachment, connection, operating cycle and site clearances before approval.

Clear delivery and support scope

Agree inspection, documents, packing, schedule, site support and warranty before order placement.

01 / SPECIFICATIONS

Read powered-grab specifications as paired rows.

U5D and ZD20 are different arrangements. The final unit needs a drawing that identifies its motor, rope and cable interfaces; figures from separate rows do not describe one grab.

Swipe to compare the complete selected-unit parameters →

Model	Crane rating	Bucket volume	Material density	Listed material per grab	Power / rope
U5D motor grab	3 t	0.5 m³	2.4 t/m³	1.2 t	Ø11 mm rope; 19 s close
ZD20 electric grab	10 t	2 m³	≤2 t/m³	4 t	18.5 kW; Ø15 mm rope

Listed material mass excludes grab self-weight. The ZD20 example uses one supporting and one closing rope. Approve the selected configuration's electrical diagram, mass and outdoor protection before ordering.

Rope and outline data for these configurations

Model	Rope / sheave arrangement	Outline dimensions
U5D	Ratio 4; Ø250 mm sheave	H 2,280 / D 1,970 mm
ZD20	1 support + 1 closing rope; ratio 5; Ø350 mm sheave	H 3,870 / D 3,000 mm

H and D are outline labels. Use the approved unit drawing for installation clearances, opening width and building work.

Can a standard electric grab work underwater or in any hazardous area?

No. Standard electric and motor grab designs are not specified for underwater operation. Submerged work, explosive atmospheres or corrosive vapours require a dedicated engineering review and a suitable selected product.

Review the configuration

02 / APPLICATIONS

Powered closing for a defined bulk-handling route.

Dense industrial bulk

A small volume may still carry a substantial mass when material density is high. Check loaded grab weight, cutting edge and hopper geometry.

Receiving and process feeding

Powered closing can be coordinated with a repeatable crane cycle when the cable feed, controls and discharge method are designed together.

Crane upgrade projects

Review the existing crane's safe load, hook or rope system, cable management and electrical protection before specifying a replacement bucket.

The motor, cables and controls add equipment interfaces. State the full installation route and any rain, dust or corrosive exposure before choosing a powered attachment. Compare the matching crane system.

03 / CONFIGURATION

Choose the attachment around the actual lift.

Choose bucket volume from the cargo's density and filling behaviour, then match the motor, electrical supply, cable route and crane controls to the required handling cycle. Confirm the loaded mass and open dimensions on one selected-unit drawing.

01 / MATERIAL LOADING

Choose bucket size after density

Compare the material mass at maximum fill with grab self-weight and crane rating; select shell and teeth for abrasiveness and lump size.

Bulk density and moisture
Lump size and wear
Total loaded mass

02 / ELECTRICAL SUPPLY

Match power and protection

Confirm voltage, phase, frequency, motor demand, cable feed and environmental protection on one schedule.

Site supply
Power and cable route
Rain and dust exposure

03 / CRANE CONTROLS

Coordinate closing and lifting

Define the closing/opening commands, limits, holding behaviour and operator view with the crane's lifting controls.

Closing sequence
Operator position
Emergency response

04 / ACCESS AND SERVICE

Plan replaceable wear items

Allow safe access to the motor, linkages, shells, ropes and cable terminations for routine inspection.

Motor and brake access
Sheaves and rope
Shell edges and pins

Ask each supplier to quote the same material, crane interface, operating cycle and delivery boundary for a meaningful comparison.

Request a matched offer

04 / QUOTATION SCOPE

Compare a complete attachment package.

Equipment price, crane modifications and site services should be separated so your team knows what is supplied and what remains to be done locally.

Powered grab

List shell, drive motor, gearbox or mechanism, rope head, protective components and actual attachment self-weight.

Electrical integration

Show cable feed, control panel, interlocks and connection to the crane's power and controls.

Acceptance and service

Agree functional tests, inspection documents, packing, spare parts, delivery and site assistance.

05 / ORDERING & DELIVERY

Approve the selected unit before manufacture.

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.

Request these documents with the offer

Selected grab general arrangement and self-weight
Motor, power and cable-routing schedule
Rope and crane connection drawing
Open/close sequence and control diagram
Agreed functional and load test records
Operating and maintenance documents

List the destination standards and customer witness points before finalising the acceptance plan.

01
Application review
Confirm load, crane interface, environment, operating sequence and buyer requirements.
02
Drawing approval
Approve dimensions, self-weight, selected components, controls and site responsibilities.
03
Build and inspect
Complete the agreed functional and load-case checks, records and packing.
04
Deliver and commission
Coordinate transport, unloading, installation checks, operator instruction and handover.

MINIMUM ORDER

Ask for one configured unit

Single-unit enquiries are welcome. The written offer confirms the selected design's minimum order and exactly what is supplied.

CERTIFICATION & TESTS

Specify the destination

State applicable market and customer requirements. The offer lists the documents, inspections and tests available for the selected unit.

LEAD TIME

A project schedule in writing

Drawing approval, production, inspection and shipping are separate milestones. A dated delivery programme follows the selected configuration.

WARRANTY & AFTER-SALES

Know the support terms before shipment.

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 terms

01 / INSTALLATION

Match the crane interface

Assign who supplies power, rope, hook connection, controls, rigging and commissioning equipment.

02 / ACCEPTANCE

Test the stated load case

Agree inspection and functional checks around the material and lift the attachment was selected for.

03 / SPARES

Maintain the installed unit

Record the final model, serial number and wear parts so replacement components fit the supplied configuration.

06 / RELATED EQUIPMENT

Compare the attachments that fit your load.

View the full attachment range

07 / BUYER QUESTIONS

Questions to settle before buying.

Use these answers to prepare one technical and commercial brief for the selected unit.

Discuss this attachment

Do U5D and ZD20 have the same power arrangement?

No. They are separate configurations. ZD20 lists an 18.5 kW power value; do not transfer it to U5D or another bucket.

Is 4 t the total suspended mass of ZD20?

No. Its example lists 4 t of material. The selected grab's self-weight must be added before checking the crane's capacity.

Can this be installed on a hook crane?

Possibly, after verifying load rating, lifting connection, cable route, power, controls and clearances. A hook alone does not settle compatibility.

Can I use it in rain or outdoors?

Outdoor exposure must be specified. The selected equipment needs suitable electrical protection and cable management before use.

What should a complete quote identify?

The approved bucket and drive, crane interface, power and controls, documents, test scope, schedule, warranty and after-sales terms.

YOUR EQUIPMENT BRIEF

Request a Electric clamshell grab technical offer.

Send material density and maximum lump size, crane rating, power supply, cable travel, pickup and discharge drawings and the number of cycles per hour. The selected drawing and commercial offer can then identify the attachment, crane interface, documents, delivery and support.

Send my attachment enquiry ↗

Include these project details

01 Material density, moisture and lump size
02 Crane rating, hook or rope drawing
03 Site voltage, frequency and cable route
04 Lift, travel and discharge dimensions
05 Duty and environment, including weather
06 Destination acceptance and delivery terms

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