Buying Second-hand Excavators: Tips And Techniques

1. Check the number of hydraulic hoses that have been replaced on the machine; the fewer the replacements, the newer the machine is likely to be. <br />2. Check for engine oil leaks. When accelerating, observe whether the machine operates normally; specifically, check for black smoke emission and listen for any abnormal noises. <br />3. Assess the strength of the main hydraulic pump. With the engine idling, attempt to use the machine body to lift itself off the ground; if it fails to lift, this indicates a weak pump or-if accompanied by abnormal noises from the engine head-insufficient engine power. Increase the throttle and fully extend all hydraulic cylinders to observe whether the pump pressure responds accordingly. <br />4. Inspect the track chains and track shoes. (This is a relatively straightforward check.)<br /> 5. Inspect the swing mechanism for rotational and vertical clearance. A small amount of lateral clearance is permissible, but there should be absolutely no vertical (up-and-down) movement. <br />6. Verify the operating speed of the machine at standard throttle settings.<br /> 7. Inspect all hydraulic cylinders for any visible scratches or surface damage. <br />8. Perform a travel test: Lift one side of the machine off the ground and engage the high-speed travel mode. Place your ear close to the drive sprocket to listen for any abnormal noises.