C) Piston impact surface

C) Piston impact surface

Damaged piston impact surface causes an adverse effect to the breaker tool. Repair it at early failure stage before too late or replace the piston.

a) Collapse

If impact surface has collapsed by more than 2 mm in depth, replace the piston. If impact surface deformation is less than 2 mm in depth, smooth the deformed area as flat as possible.

b) Chipping a peeling-off

If impact surface has got chipping or peeling-off on some limited areas, smooth the areas to stop progress of peeling-off.

c) Chipping-off at the piston bottom edge

Replace the piston immediately.