FAQs: Rotating Selector Grabs

What is a rotating selector grab?

A rotating selector grab is a hydraulic excavator attachment with opening and closing jaws for gripping materials. Its rotating head lets the operator turn the load independently of the excavator, giving precise control when picking, sorting, loading and placing items. Many models offer continuous 360° rotation.

What are rotating selector grabs used for?

Rotating selector grabs are commonly used for selective demolition, waste handling, recycling, material sorting, loading skips and trucks, site clearance, and handling timber, rubble, scrap, green waste and aggregate.

What excavator sizes can use a rotating selector grab?

Attachment Hire's rotating selector grabs are available for excavators in the 5–22 tonne range. The exact grab must match the carrier machine's operating weight, lifting capacity, hydraulic performance and mounting dimensions.

Does my excavator need auxiliary hydraulics?

Yes. A rotating grab normally needs two auxiliary hydraulic functions: one to open and close the jaws and another to operate the rotating head. This typically means two auxiliary circuits, although some systems can use an electrical diverter or changeover kit where only one circuit is available.

What machine details are needed before hiring?

Provide the excavator make and model, operating weight, hitch or mounting type, pin diameter, pin-centre measurement, dipper-arm width, hydraulic flow and pressure details, and the type of auxiliary hydraulic circuits fitted. These details allow the hire supplier to confirm a safe and compatible setup.

Can a rotating selector grab fit a quick hitch?

In most cases, yes, but compatibility depends on the hitch system and the grab's headstock or mounting arrangement.

When requesting a quotation, let us know the quick-hitch make and model so we can confirm the correct attachment configuration.

What is the benefit of 360° rotation?

Rotation lets the operator turn and accurately position material without moving the excavator as often. This improves control when loading, sorting mixed waste, placing material into skips or containers, or working in confined spaces.

Can it handle demolition waste?

Yes. Rotating selector grabs are well suited to selective demolition and sorting mixed demolition materials, including concrete pieces, timber, metal, brick and general site debris. They help separate recoverable material from waste at the point of handling.

Is a rotating grab suitable for recycling work?

Yes. The jaws can pick and separate different material streams, while rotation helps with controlled loading into skips, containers, crushers and recycling equipment. This makes the attachment useful for waste transfer, recycling and skip-yard operations.

Is a rotating grab better than a fixed selector grab?

It depends on the job. A fixed grab is often the more cost-effective choice for straightforward grabbing tasks, since it typically runs from a single double-acting hydraulic circuit.

A rotating grab costs more and requires more from the machine to operate. However, it offers significantly greater control and flexibility because the load can be turned independently of the excavator, rather than requiring the whole machine to reposition.

Are rotating selector grabs suitable for confined sites?

Yes. Their ability to rotate material into position can reduce unnecessary machine movements, making them useful on restricted demolition, refurbishment, recycling and urban construction sites. Operators must still allow for the attachment's working envelope and maintain safe exclusion zones.

How should the grab be operated safely?

Only trained, authorised operators should use the attachment. Check the couplings, hoses, pins, hitch lock, hydraulic function and condition of the grab before work starts. Never exceed the excavator's lifting or stability limits, keep people clear of suspended or moving loads, and follow the excavator and attachment manufacturer's operating instructions.

What maintenance checks are important?

Before and during use, check the following:

• Hoses and couplings: Inspect for leaks or damage, and keep couplers clean before connecting.
• Hydraulic system: Monitor oil level and temperature, and ensure the oil condition is correct.
• Grab components: Check jaws, pins, bushes, fasteners and the rotating mechanism for wear.

Routine inspection and maintaining the correct hydraulic oil condition help protect both the excavator and the attachment.

Is nationwide hire available?

Yes. Attachment Hire Ltd offers specialist hydraulic excavator attachments, including rotating selector grabs, for hire nationwide.

To confirm availability and transport options, contact the team with your excavator details, location and required hire duration.