Hydraulic Breakers for Excavators 40.0–75.0 t
LIS® hydraulic breakers for excavators from 40.0 to 75.0 t are box-type heavy breakers with ABH blank firing protection for primary demolition, rock breaking, quarry work, heavy demolition and large-scale infrastructure projects. Selection is based on carrier weight, hydraulic output, return pressure, hose size, breaker weight, tool diameter and application material.
- Carrier class: large excavators, heavy crawler excavators and carrier machines from 40.0 to 75.0 t
- Design: currently listed as hydraulic breakers without bracket for project-specific or machine-specific adapter solutions
- Technical selection: check oil flow, operating pressure, return line, hose size, ABH function, carrier machine and working tool
For smaller carrier machines, see our hydraulic breakers for excavators from 8.0 to 35.0 t and hydraulic breakers for mini excavators from 0.8 to 7.0 t. Suitable chisels, wear parts and accessories are available under hydraulic breaker accessories.
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Selecting the right hydraulic breaker for large excavators
Hydraulic breakers for excavators from 40.0 to 75.0 t must be matched precisely to the carrier machine, hydraulic system and application material. In this performance class, carrier weight, breaker weight, oil flow, operating pressure, return pressure, hydraulic hose size, tool diameter, mounting geometry and operating duration are decisive. Incorrect oil flow or excessive return pressure can lead to increased oil temperature, irregular operation and higher component load.
In daily construction use, these attachments are also referred to as hydraulic breakers for large excavators, demolition breakers for excavators, excavator breakers, hydraulic hammers or heavy hydraulic breakers. For this category, the carrier class is decisive: the hydraulic breakers listed here are intended for heavy excavators and large carrier machines from 40.0 to 75.0 t. For smaller machines, see hydraulic breakers for excavators from 8.0 to 35.0 t.
Technical overview of selected LIS® heavy breaker series
| Model series | Carrier class | Oil flow | Operating pressure | Impact frequency | Hose size | Tool Ø |
|---|---|---|---|---|---|---|
| LIS175A-BT | 40–55 t | 210–280 l/min | 160–180 bar | 200–350 BPM | 1 1/4 inch | 175 mm |
| LIS190A-BT | 50–65 t | 240–300 l/min | 200–230 bar | 180–225 BPM | 1 1/2 inch | 189 mm |
In addition, this category includes LIS195A-BT for excavators from 50 to 65 t and LIS215A-BT for excavators from 70 to 75 t as versions without bracket. For these model series, technical selection is carried out on an item-specific basis according to carrier machine, hydraulic output, mounting geometry and application.
Version without bracket for project-specific mounting
The heavy breakers currently listed in this category are supplied as hydraulic breakers without bracket. This version is suitable when an existing adapter solution is used, when a machine-specific top bracket is built, or when the breaker is directly adapted to a project-specific mounting system. In this performance class, mounting system, pin dimensions, dipper arm geometry, quick coupler and total attachment weight should always be checked in relation to the carrier machine.
A general assignment to individual quick coupler systems is not sufficient for heavy hydraulic breakers. The decisive factors are the actual machine configuration, mounting geometry, hammer hydraulic circuit and the permissible load on boom and dipper arm.
Hydraulic matching for heavy carrier machines
For hydraulic breakers in this performance class, hydraulic matching is a central factor for working performance and operational reliability. Supply and return lines must be sufficiently dimensioned. Line cross-sections that are too small increase back pressure and can lead to oil overheating or irregular impacts. Oil filtration, oil condition and oil temperature should also be checked regularly.
Before commissioning, oil flow, operating pressure, return pressure, hose connections, carrier weight, breaker weight and application material should be compared with the technical data of the hydraulic breaker. For large excavators, it is also important to consider whether the breaker will be used under continuous high load in primary demolition, rock breaking, quarry work or heavy demolition.
Box-type design, ABH blank firing protection and nitrogen technology
The LIS® hydraulic breakers in this category are designed as box-type hydraulic breakers. The breaker is operated hydraulically via the oil flow of the carrier machine; the nitrogen-assisted impact mechanism supports the conversion of hydraulic energy into impact energy. Working performance depends significantly on correct oil flow, suitable operating pressure, clean hydraulic oil and proper installation.
The ABH blank firing protection system supports protection against impacts without sufficient counter-pressure. The system reduces breaker load under unfavourable operating conditions, but it does not replace correct operating practice. Blank firing, levering with the chisel, side loading, using the breaker to transport loads and prolonged hammering on the same point should be avoided.
Applications: primary demolition, rock breaking and heavy demolition projects
Typical applications include primary demolition, foundation demolition, heavy concrete demolition, reinforced concrete demolition, rock breaking, quarry work, large-scale demolition, infrastructure projects, road construction and heavy civil engineering. The specific breaker size should always be selected according to material, excavator class, hydraulic output, tool diameter and working method.
For hard or brittle material, the correct chisel selection is decisive in addition to impact performance. Pointed chisels and wedge-type chisels support penetration into the material, while blunt tools work through impact on hard, brittle material.
Chisels, wear parts and workshop notes
Chisels, chisel bushings, front bushings, pins, seals and hydraulic hoses are wear and inspection areas. In heavy-duty applications, these components should be checked regularly, as wear on bushings, pins or the chisel can affect impact direction and increase the load on piston and front head.
- Lubrication: lubricate chisel and bushings regularly according to the operating manual.
- Hydraulic oil: monitor oil level, oil temperature, oil filtration and contamination before and during operation.
- Operation: use the ABH blank firing protection and still avoid blank firing, levering with the chisel and prolonged hammering on the same point.
- Inspection: check hoses, connections, bolts, pins, bushings and visible wear areas regularly.
Suitable working tools, wear parts and further accessories are available under hydraulic breaker accessories.
User manuals, warranty and technical support
For installation, commissioning, maintenance and safety-related information, the user manuals for LIS® hydraulic breakers are available for download. Before operation, the technical data of the hydraulic breaker should be compared with the carrier machine. This includes carrier weight, oil flow, operating pressure, return pressure, mounting system, hydraulic lines, hose connections and application material.
LIS® attachments are subject to the LIS® warranty terms and conditions. Wear parts, tools and components specified in the warranty terms must be considered separately.
Not sure which item fits? Our technical team will assist you in selecting the right hydraulic breaker for your excavator. Technical support.
Note: Brand names, quick coupler names and system designations are used solely for technical identification and compatibility checks. These are not original parts of the respective manufacturers unless explicitly stated.
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