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Crane moving slowly? Don't replace parts blindly. If the entire machine becomes weak after warming up, the gear pump is often the first suspect. Worn internal clearances allow hydraulic oil to leak internally, reducing pressure and efficiency. If only one hydraulic function is weak while others work normally, check the directional control valve. Boom drift after shutdown is another strong indicator of valve leakage. If the machine is weak from startup, oil temperature rises quickly, and a consta