Method for adjusting clearance of bearing at upper part of heavy loaded planetary reducer of coal cutter cutting unit

The invention discloses a method for adjusting the clearance of a bearing at the upper part of the heavy loaded planetary reducer of a coal cutter cutting unit. The heavy loaded planetary reducer includes an inner ring gear, a sun gear and a planet carrier. On the planet carrier are mounted a plurality of planetary gears, the sun gear is engaged with the plurality of planetary gears, the inner gear ring is engaged with the planetary gears, a first bearing seat is arranged on the coal cutter cutting unit and located at the lower part of the planet carrier, a first tapered roller bearing is arranged on the first bearing seat, a second bearing seat is arranged at the upper part of the inner ring gear, and a second tapered roller bearing is arranged on the second bearing seat. The method for adjusting the clearance of the second tapered roller bearing comprises (1) mounting a seal cover; (2) calculating the clearance S between the seal cover and the second bearing seat; (3) calculating the adjustment amount X of