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When Does Your Hammer Need Repair?

Leaking hydraulic fluid is the most common symptom we see.


Hydraulic fluid running down the tool bit is an obvious indicator that your hammer has a problem. That problem is usually a strong indicator that piston seals have failed.


Some other parts that may need replacement during a hammer overhaul:


Reseal – A hydraulic hammer rebuild always involves replacing all of the seals.


Diaphragm – This critical component of the accumulator mechanism contains high-pressure nitrogen gas. Leaks or ruptures to the diaphragm will not allow the hammer to operate properly.


Lower tool bushing – The most commonly replaced part in a hammer is the lower tool bushing. When hammering at an angle, not perpendicular to the surface, the tool bit wears against the tool bushing. Improper tool grease maintenance will increase tool bushing wear. When the bushing becomes worn and loose it causes a ripple effect throughout the hammer. This effect causes the tool bit to slide crooked in the hammer causing the piston to strike the tool bit at an angle. This

issue causes warping and fractures in the piston striking surface.


Tie rods – Tie rods, which hold the hammer together, fatigue over time and lose strength. Most manufacturers set limits on the reuse times for tie rods. Tie rods should be replaced in diagonal pairs across the hammer.


Piston – Damaged, cracked, or worn pistons are not as common as other parts requiring repair. Sometimes, we can repair imperfections in a piston by polishing the cylinder. Some pistons are deeply scored or broken, requiring replacement.


Tool bit – Tool bits that are hammered until they become very short will transfer heat faster into the hammer than longer tool bits. Excessive heat build-up can cause premature wear of parts inside the hammer and eventually contribute to a hammer’s failure.

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