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Products & Equipment
Komatsu expanding its range of hydraulic breakers


May 4, 2021
By Rock to Road Staff
The JMHB130H in rocks. Photo: Komatsu

Komatsu is expanding its product line of hydraulic breakers due to what it calls increased demand in North America.

Breakers are a flexible and crucial attachment used for a wide variety of jobs, including tunnelling, trenching , foundation removal, dredging, bridge demolition, quarry excavation, mining and more.

The breakers are designed and tested for compatibility with Komatsu excavators from the PC78 up to the PC490.

“The high percussion efficiency and unique variable energy technology of these breakers are built to provide high production in multiple applications,” the company said in a press release.

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Features and benefits

The breakers have an accumulator that eliminates hydraulic pump cavitation to prevent flow surges back to the carrier hydraulic tank. By recycling high-pressure oil internally, this allows more energy with a lower flow to reduce pressure spikes and protect the carrier’s hydraulic system.

The JMHB130H breaker – an up close view.

JTHB-G line of breakers

With only two moving parts, the JTHB-G line uses a hybrid design of hydraulic flow and pressure along with a nitrogen-filled chamber that provides striking energy. The tie-rod design is engineered for durability in tough rock and concrete applications.

Blank firing protection is standard and includes a hydraulic cushion at the base of the cylinder, to reduce metal-to-metal contact. Larger models feature special key slot dampers that help reduce vibration to the excavator, adding to the operator’s comfort.

JMHB-H line of breakers

Compact yet powerful, the JMBH-H attachments are accumulator-type hydraulic breakers for a variety of rock and concrete demolition applications. Unlike gas-fired breakers, they don’t require a nitrogen recharge. They come equipped with blank firing protection to help prevent piston movement via a hydraulic brake.

For consistent impact power in a variety of environments, sound dampening housings help assure compliance with noise ordinances, even in urban applications, the company said.

The breaker protects itself with a pressure regulator valve to prevent overflow — and its dampening system helps prevent damage to excavator booms and housing cracks.

To enable the use of more powerful breakers on smaller excavators, a single powercell eliminates heavy tie rods to provide a better weight-to-power ratio on compact models, while the mounted automatic lubrication feature helps protect against dust and debris.


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