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Use soapy water to check for cylinder leaks. If there is leakage at the outlet of the front cover piston rod, the U-ring is ineffective; if the cylinder is connected to the front cover or the rear cover, the roll is not rolled between the cylinder and the front cover (rear cover). qualified. 
If the cylinder is leaking, the COP seal fails. Because the QGAW10 cylinder assembly uses a rolling process, it cannot be repaired after failure. 
Cylinder failure analysis