1. See if the joint is smooth. During the transportation and storage of concrete mixer parts, due to vibration and collision, burr, indentation, damage or crack often occur at the joint, which affects the use of concrete mixer parts. Pay attention to the inspection when purchasing.
2. Check the surface of parts for corrosion. The surface of qualified concrete mixer parts has a certain precision and a bright finish. The more important the parts are, the higher the precision is, the more strict the anti rust and anti-corrosion of packaging is. When purchasing, pay attention to inspection. If the parts of concrete mixer truck are found with rust spots, mildew spots, rubber parts cracked or lose elasticity, or there are obvious turning tool lines on the surface of shaft neck, they should be replaced.
3. See if the rotating parts are flexible. When purchasing the oil pump and other rotating parts assembly, the pump shaft should be rotated by hand to feel flexible without sticking; when purchasing the rolling bearing of the concrete mixer truck, one hand should support the inner ring of the bearing, the other hand should rotate the outer ring, and the outer ring should be able to rotate quickly and freely, and then stop gradually. If the rotating parts do not work well, it means that the internal corrosion or deformation, do not buy.
4. See if the geometry is deformed. Some parts of concrete mixer truck are easy to deform due to improper manufacture, transportation and storage. During the inspection, the shaft parts can be rolled along the glass plate for a circle to see whether there is light leakage at the joint between the parts and the glass plate to judge whether it is bent.
When choosing the steel plate or friction plate of the clutch driven plate of the concrete mixer, you can lift the steel plate and friction plate in front of your eyes to observe whether they are warped; when choosing the oil seal, the end face of the oil seal with framework should be in a normal circle, which can fit with the flat glass without bending; the outer edge of the oil seal without framework should be straight, which should be deformed by hand, and can be restored to the original state after releasing. In the purchase of various types of gasket, also pay attention to check the geometric size and shape.