TOKU Pneumatic & Hydraulic Breakers: Precision Craftsmanship for Long-Term Use

Almost 90 Years of Pneumatic and Hydraulic Engineering

Founded in 1937 in Japan, Toku has a straightforward mission: to lead with quality. This focus has driven them to develop advanced pneumatic and hydraulic technology, resulting in reliable products made in Japan. The company operates six factories, each with its own research and development centre, manufacturing unit, quality control, and training facilities. Their product range includes 25 hydraulic and pneumatic tools, automotive tools, and air hoists — a breadth that reflects a company whose core competency is precision impact engineering, not just a single product line.

Toku is the Japanese manufacturer having over 50 years of experience on hydraulic breakers, and has been challenging to supply the best performance breaker with high impact power and high durability into the worldwide construction and mining market. The pneumatic side of the business — where Toku started — feeds directly into the hydraulic line: decades of designing air-driven tools to Japanese manufacturing tolerances built the metallurgical and machining discipline that now characterises every TNB-series hydraulic breaker. In Japan, where a manufacturer's longevity and quality reputation compound over generations rather than product cycles, that heritage carries real operational weight.

The Accumulator-Free Philosophy: Fewer Parts, Longer Life

Most hydraulic breakers use a nitrogen accumulator to store energy between piston strokes and smooth out pressure fluctuations. Toku's TNB series takes a different route. Advanced accumulator-free technology enables a less component, simple structure. That choice eliminates one of the highest-maintenance components in a conventional breaker — the accumulator diaphragm, which is subject to nitrogen charge loss, diaphragm fatigue, and seal degradation — and replaces it with a long-stroke piston design that achieves the same energy storage and release function through piston geometry and a flow-through control valve.

The TNB breakers feature a uniquely simple yet efficient design with only two moving parts — requiring no maintenance. A long-stroke piston is described as the most efficient design for energy transfer and recoil reduction; the control valve uses a flow-through design that reduces hydraulic surge and efficiently controls the breaker operating cycle; and a 50/50 piston-to-tool weight ratio efficiently transfers blow energy into the material and reduces recoil. Dual retainer pins provide correct tool alignment and even tool wear for longer tool and bushing life. Together those four design choices — piston geometry, flow-through valve, weight ratio, dual retainers — deliver the performance that an accumulator provides in a conventional breaker, without the accumulator's service requirements.

The practical field consequence is straightforward. Featuring only two moving parts and few seals, Toku breakers offer more up-time along with simple in-the-field maintenance. When a repair is required, the Toku breaker will be back on the job quickly and at a reasonable cost. Low pressure nitrogen charge cushions every blow, reducing wear and tear on the carrier and adding to operator comfort — without the pressure management that a high-charge accumulator system demands at each service interval.

TNB Series: Model Range and Application

The TNB series runs from 100 ft-lb class mini breakers up to 12,000 ft-lb class large units, covering excavators from under 2 tonnes to over 80 tonnes. The table below maps key models to their carrier class, impact rate range, and primary application.

Adaptability Across Carriers and Environments

One breaker can be moved from one machine to another with a simple pin and bushing change, so you get more return on your investment. For example, one hammer will fit a skid steer loader and is then easily moved to a compact excavator. That side-plate and bracket system is not an afterthought — it is a deliberate design decision that allows rental companies and multi-machine fleets to treat a single TNB unit as a shared asset rather than a dedicated attachment, reducing the total capital cost of maintaining breaking capacity across several machine classes.

The TNB breakers are not sensitive to system back pressure, and can be powered by the wide variety of carriers in the field. That tolerance for varying back-pressure is particularly valuable in older or non-standard excavators whose hydraulic return lines may not meet modern tight-specification requirements. Where a breaker with narrow back-pressure tolerance would overheat or perform erratically, the TNB maintains consistent output. The Toku Large Breakers are compatible with Cat, John Deere, Komatsu, Kobelco, CASE, Hitachi, and Volvo excavators — a broad compatibility list that reflects the accumulator-free design's inherent flexibility with differing hydraulic circuit characteristics.

For the most demanding environments, an optional Severe Duty Wear Package includes auto-lube options, air check valves, and positive pressure systems to keep dust out, making these breakers ideal for the toughest conditions in quarry and mining applications. The enclosed box type incorporates a silenced design, ideal for operations near residential areas, and is available for all Toku models. Three chisel types — moil point for reinforced concrete and large rock surfaces, flat chisel for trenching and finishing slopes, and flat-end for crushing larger rocks into smaller sizes — cover the full range of breaking tasks a TNB unit encounters across construction, demolition, quarrying, and recycling applications through its service life.