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CIVILEQUIP BUYING GUIDE

Matching a breaker, crusher bucket or earth drill to the excavator

Carrier weight class, auxiliary flow, pressure, return back-pressure and the mounting bracket decide whether a hydraulic attachment works on your machine.

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The attachment is only as good as the circuit behind it

A hydraulic breaker, crusher bucket or earth drill draws its power from the carrier's auxiliary circuit. A model that suits the carrier's weight can still under-perform, overheat or damage seals if the flow, pressure or return line is wrong. Attachment makers therefore publish a carrier weight range and a hydraulic window, not just a weight. Caterpillar's H65s hammer page, for example, lists a minimum carrier weight, an optimal flow range of 40–115 L/min and a minimum operating pressure, alongside impact energy and frequency.

On this site, the Gonggong breaker family, the Juli JM-600 crusher bucket and the Tysang 2500 earth drill each publish or need a different set of these numbers. Start every enquiry with the carrier's make, model, operating weight and auxiliary-circuit data.

Four numbers to send the supplier

First, the carrier's operating weight and model, so the supplier can check the weight class and boom loads. Second, the auxiliary flow actually available at working engine speed, not the pump's maximum. Third, the relief setting of the auxiliary circuit, which must sit above the attachment's working pressure but within what the attachment can tolerate; relief cartridges such as the AOER RP-14W-20A from AOER are what sets that limit. Fourth, the return path: crusher buckets and some breakers are sensitive to back-pressure, which is why the Juli profile lists back-pressure limits for the JM-600.

Earth drills add torque and speed. The Tysang profile compares carrier bands, and the published 2500 data gives flow, pressure and torque ranges; match them to the auger diameter and ground you will drill.

Mounting, hoses and who supplies what

The bracket, pins and quick-coupler interface must suit the carrier. Ask for a mounting drawing before ordering, and state whether hoses, couplings and a valve kit are included. Hose ends are an easy place for mismatch: a Jingye ORB hose fitting shows how many thread and seal variants exist, and the Jingye profile reviews straight and swivel ORB references before approval.

The Gonggong profile separates attachment sales, parts manufacture and repair; ask which of those you are buying, and who supplies seals, chisels and service parts later. EU machinery law classes a breaker or drill fitted by the operator as interchangeable equipment, a product separate from the excavator; expect its own declaration and manual rather than relying on the carrier's paperwork.

When an attachment is the wrong tool

Not every job suits an excavator attachment. A water well deeper than an auger can reach needs a dedicated rig with its own compressor, such as the Sanrock 350 m rig. A clean opening in a slab may be better cut with a Dekola diamond core drill than broken. Browse attachments, drilling and foundation equipment and concrete equipment side by side before fixing the method, and check valves and fittings in hydraulic components.

Sources

  1. Caterpillar H65s hammer specifications
    Example of a maker's published carrier weight class, optimal flow 40–115 L/min, minimum operating pressure and energy class.
  2. Regulation (EU) 2023/1230 on machinery
    Article 3(2) definition of interchangeable equipment.
  3. ISO 4413:2010 Hydraulic fluid power — safety requirements for systems
    General rules for hydraulic systems on machinery, including pressure protection.

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