1. Visual judgment.

　　Manual Seeder can judge the wear of mechanical surface parts and the quality of raw materials of parts. Such as cracks on the cylinder block and cylinder head, fatigue of the gears and movable bearings, the injectors and exhaust valves are burnt out and appear annealed blue or pits, conflicting data of clutches and brakes are worn and burned, gears Vice bite marks, light leakage between piston and cylinder liner, etc.

　　 2. Auditory judgment.

　　 Judgment of hearing can be used to quietly tap the viewing part of the metal parts. From the announced sound, it can be judged whether there are cracks in the interior, whether the connection is tight, and the generally tight parts have a loud sound, and the flawed sound is dumb. In this way, it can be judged whether there are cracks on the crankshaft and side bars of theManual Fertilizer Seeder, the combination of the bearing alloy and the body, and whether the imported pump Caster wine rivets are firmly connected. In addition, from the sound announced by the working gear set, the meshing condition can also be roughly judged.

　　 3. Tactile judgment.

　　 Tactile judgment can be shaken by hand, and the size of the gap can be judged by feeling, without using a measuring tool. Such as the clearance between the valve rod and the valve guide, the radial and axial clearance of the movable bearing, etc.