GRAUPNER Skalar, Manual

Page: 8 / 59

elektro
Skalar
8
1.1 Assembling the tail rotor drive unit
(bag UM-1A
)
The shaft of the quick-release coupling 4618.57 must not exhibit any axial play in the bearings
4618.6. If the shaft is not a tight enough fit in the bearings, glue it in the ballraces using bearing
retainer fluid 603, Order No. 951. This is the procedure: start by applying bearing retainer fluid
603 to the rear ballrace and slide it along the shaft until it rests against the coupling yoke. Wait
until the adhesive has cured, which may take anything between 20 seconds and 30 minutes
depending on the fit. Press this assembly fully (as far as it will go) into the bearing holder
4448.14, then apply bearing retainer fluid 603 to the front ballrace and push it straight onto the
shaft and into the bearing holder as far as it will go. Now - before the adhesive cures - immedi-
ately check that the shaft still rotates freely, as it is possible that axial tension will make the
bearings stiff to move. If this happens, tap lightly on the end of the shaft with a screwdriver
handle or similar, or tap harder on the bearing holder until the races rotate freely. When you are
satisfied, leave the bearing retainer fluid to cure fully.
Now fit a shim washer and the pinion 4450.41 on the front end of the shaft, press them against
the front bearing and tighten the two grubscrews in this position. This is the procedure: first apply
a drop of thread-lock fluid (Order No. 952) to the threaded holes, and fit the first grubscrew so
that it engages fully on the flat ground into the shaft; rotate the pinion to and fro until the
grubscrew engages fully, then tighten it moderately. Now fit the opposite grubscrew and tighten it
very firmly, before finally tightening the first grubscrew permanently. This procedure ensures that
the pinion rotates absolutely true.
1.2 Assembling the layshaft
(bag SKA-1B)
Fix the bottom bearing 4450.31 to the layshaft 4450.7 using bearing retainer fluid 603, Order No.
951; the ballrace should rest against the pinion. Allow the adhesive to cure fully, then press the
shaft and bearing into the bottom bearing support 4448.11B. Fix the upper bearing 4450.31 to
the upper bearing support 4475.11 using bearing retainer fluid 603, Order No. 951 and allow the
adhesive to cure fully.