The HB 4200 hydraulic breaker from Atlas Copco Construction Tools Inc. features Krupp percussion technology and a service weight of more than 4 tons, making it ideal for demolition, tunneling, trenching, foundation work and primary and secondary quarry breaking.

Accepting a maximum hydraulic flow of 84 gallons per minute at 2,610 psi of pressure, the HB 4200 delivers an impact rate of up to 530 bpm. This allows maximum productivity under some of the most extreme breaking conditions.

The HB 4200 comes standard with AutoControl, a monitoring system that allows the hammer to adapt its frequency and power output to match operating conditions. It begins by firing the first stroke at half power to create a pilot notch that will center the working tool and prevent unnecessary tool slippage. It then adjusts the power output to match the density of the specified material to be broken. This reduces excess shock on both the hammer and carrier and lengthens the service life on tension bolts and retainer bars.

To further maximize efficiency, the HB 4200 features the StartSelect system, which allows start-up and shut-off to be adjusted to fit job-site conditions. In AutoStop mode, the hammer will not fire until the operator applies down pressure on the demolition tool via the carrier. AutoStop eliminates damaging blank firing by circulating the hydraulic oil internally under low pressure when down pressure is not applied to the tool. AutoStop is also ideal for safely circulating and warming the hydraulic system before breaking in cold climates.

In AutoStart mode, the StartSelect system works hand-in-hand with AutoControl. The hammer begins operating as soon as the working tool comes into contact with the material regardless of down pressure, but power is limited to 50 percent until the demolition tool can be fully seated in the hammer. This assures the hammer is properly positioned to accept full single blow energy safely without a damaging blank fire. AutoStart mode makes the hammer more versatile and ideal for demolition applications.

An energy recovery system that prevents damage from piston recoil on extremely hard materials is standard on the HB 4200. The system consists of a shuttle valve that detects piston rebound and a high-pressure accumulator that stores energy from piston recoil. The stored energy is used on the succeeding strokes, making them faster and harder. Recycling recoil energy increases efficiency and reduces pressure spikes transmitted back to the carrier.

To reduce excess vibration and noise, the HB 4200 comes equipped with the VibroSilenced damping system. Elastic elements between the percussion mechanism and the guide system provide full acoustic insulation, reducing noise by up to 18-dB(A) compared to similar systems.

For prolonged service life, the HB 4200 features DustProtector II and ContiLube II. The optional DustProtector II feature prevents dust penetration by utilizing a reusable sleeve that contacts the working tool at the base of the hammer to protect the inner mechanism from the damaging effects of dust. ContiLube II is an automatic lubrication system mounted directly on the hammer. Featuring a compact, self-priming pump, ContiLube II eliminates the need to manually grease the hammer before each use. Lubricant levels are easily observed from the driver