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In line with the national standard gb/t17906-1999 "hydraulic breaking tools general technical conditions", expansion force 30-42KN, the maximum opening distance ≥125mm, and can cut the diameter of 20mm round steel and 15mm thickness of the plate; The shear extender completes from the closed position to the maximum opening, Then back to the original position and 50 consecutive cycles, should also be continuous shear length 100mm, diameter of 14mm round steel or long 100mm, wide 50mm, thick 2.4mm steel plate 50 times, after the test action is normal, no leakage and abnormal phenomenon, the edge should be no curl, blade phenomenon.