DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 79 / 163

Maintenance Manual DG-808C
Issued: May 2010 TN800/41 4.18
4.13 Replacing the bearings of the upper drive belt pulley
see drawing 8M110 (enclosed to this manual)
a) Removing the bearings
1. Remove the propeller.
2. Remove the proximity switch. Its best to remove the switch together
with its mounting plate 8M138. Mark the position prior to removal.
3. Remove the drive belt see section 4.12.
4. Remove the sealing cap 8M118/1.
5. Bend up the securing washer 20 DIN462.
6. Screw off the nuts KM4 one after the other.
Attention: left hand thread.
Use one of the 2 specially bent hook spanners according to drawing
W51 (encl. with this manual). Remove the antirotation securing washer.
7. Now you can pull off the complete pulley 8M111 from the shaft
8M115.
8 Take the inner ring and the rollers of the front bearing out of the pulley.
9. To remove the outer rings of both bearings from the pulley you have to
produce 2 pieces of round material each 100 mm (4 in.) long and with
47 mm (1.85 in.) and with 53 mm (2.09 in.) diameter.
10. Press out the outer rings together with the Nilos rings carefully using a
press or a hammer.
11. Pull off the inner ring of the rear bearing together with part 8M117/1
from shaft 8M115. Use a suitable puller assy..
b) Installation of the new bearings
1. To press the outer rings of both bearings into the pulley you have to
produce 2 pieces of round material each 30 mm (1.6 in.) long and with
51 mm (2 in.) and with 57 mm (2.24 in.) diameter.
2. Press in new outer ring together with new Nilos rings.
3. To press the inner ring of the rear bearing to the shaft you have to
produce a piece of tube with 32 mm (1.26 in.) inside diameter and 90
mm (3.54 in.) long.
4. Press the inner ring together with part 8M117/1 to the shaft.
5. Fill the space in the pulley for both bearings with grease.
6. Apply grease to the inner ring of the rear bearing and place the rollers
onto the ring. Apply enough grease to completely fill the
bearing.