The clearance between needle roller bearing and seat hole worn into meshing gear seat hole and needle roller bearing and journal should be 0.01-0.08mm, and the Journal of normal meshing gear should be 4. Otherwise, it should be replaced.

The tooth surface presents uniform wear, requiring that the wear along the tooth length direction should not exceed 30% of the original tooth length; the tooth thickness should not exceed 0.40; the meshing area of the gear should not be less than 2/3 of the tooth surface; the meshing clearance of the running gear should generally be 0.15-0.26mm; the gear of the transmission should be worn under normal working conditions. The usage limit of the three-phase reducer motor is 0.80mm; the engagement clearance of the engagement gear should be 0.10-0.15mm, and the usage limit should be 0.60mm.

Three-phase deceleration motor is mainly due to the meshing clearance of the gear does not meet the requirements, 2 gear teeth broken gear teeth broken. If the edge of the gear teeth is not more than 2 mm small breakage, it can be used after polishing with oil stone. If it exceeds this range or has more than 3 small breakage, it should be replaced in pairs.

Three-phase deceleration motor to ensure good operation of gears, 3 constant meshing gear face wear often meshing helical gear face should be. 10-0.30 mm axial clearance. If the tooth end is worn and grooved, it can be grind and repair, but the grinding amount should not exceed.50mm.