Planetary Gearheads http://www.yousheng1688.com outer surface should be smooth and flat. The coupling piece, solid pieces without loosening. Planetary gear input shaft is rotated by hand, it must easily smooth, no stuck phenomenon. Planetary reducer seals, junction leakage may not have. At rated load and rated speed, the planetary gear noise should not exceed 80db (A), temperature does not exceed 65 degrees, the maximum oil temperature does not exceed 95 degrees. Worm and worm shaft axial clearance on compliance. Worm tooth surface contact pattern should meet the requirements. Planetary gear bearing capacity and transmission rate should be consistent with GB/T16444 requirements.