Piston damage form and cause of hydraulic breaker?

1. The main forms of piston damage:

(1) Surface scratches;

(2) The piston is broken;

(3) Cracks and chipping occur

news (1)

2.What are the causes of piston damage?

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(1) The hydraulic oil is not clean

If the oil is mixed with impurities, once these impurities enter the gap between the piston and the cylinder, it will cause the piston to strain. The strain formed in this case has the following characteristics: generally there will be grooves with a depth of more than 0.1mm, and the number is small, and the length is approximately equal to the stroke of the piston. Customers are advised to regularly check and replace the hydraulic oil of the excavator

(2) The gap between the piston and the cylinder is too small

This situation often occurs when a new piston is replaced. If the gap between the piston and the cylinder is too small, it is easy to cause strains when the gap changes as the oil temperature rises during operation. Its judging characteristics are: the depth of the pull mark is shallow, the area is large, and its length is approximately equal to the stroke of the piston. It is recommended that the customer find a professional master to replace it, and the tolerance gap should be within a suitable range

(3) The hardness of piston and cylinder is low

The piston is subjected to external force during movement, and the surface hardness of the piston and the cylinder is low, which is prone to strain. Its characteristics are: shallow depth and large area

(4)Lubrication system failure

The hydraulic breaker piston lubrication system is faulty, the piston ring is not sufficiently lubricated, and no protective oil film is formed, resulting in dry friction, which causes the hydraulic breaker piston ring to break

if the piston is damaged, please replace it with a new piston immediately.


Post time: Feb-26-2021

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