Komatsu expands range of hydraulic breakers

Komatsu’s JMHB-H attachments are accumulator-type hydraulic breakers for a variety of rock and concrete demolition applications. Photo: Komatsu

Komatsu is expanding its product line of hydraulic breakers to meet growing demand in North America.

Designed and tested for compatibility with Komatsu excavators from the PC78 up to the PC490, Komatsu says the high-percussion efficiency and unique variable energy technology of its breakers are built to provide high production in multiple applications.

To protect the breaker, carrier and operator, Komatsu built in several 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, Komatsu says this allows more energy with a lower flow to reduce hydraulic pressure spikes and protect the carrier’s hydraulic system.

JTHB-G breaker line

Komatsu’s JTHB-G line, which features just two moving parts, utilizes 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, the company says.

Adding to longevity and durability, Komatsu says 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 operator comfort.

According to Komatsu, the design of the JTHB-G hydraulic breakers translates to reduced maintenance and fewer parts to buy, helping to lower equipment-running costs.

JMHB-H breaker line

Komatsu’s JMHB-H attachments, meanwhile, are accumulator-type hydraulic breakers for a variety of rock and concrete demolition applications. Unlike gas-fired breakers, Komatsu says the JMHB-H series does not 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. 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, Komatsu says a single power cell eliminates heavy tie rods to provide a better weight-to-power ratio on compact models, while a mounted automatic lubrication feature helps protect against dust and debris.