GRAUPNER heim Starlet 50 Mode D'emploi page 56

Starlet 50
1.1 Assembling the tail rotor drive system
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(bag UM-1A
Please note that there must be no axial play at all in the quick-release coupling shaft 4618.57
when fitted in the bearings 4618.6. If the shaft does not seat securely enough in the bearings, fix
it to the bearings using bearing retainer fluid 603, Order No. 951. This is the procedure: first fit
the rear bearing on the shaft and secure it with a drop of bearing retainer fluid 603, and position
it so that it rests against the coupling yoke. Wait until the adhesive has cured; this may take
anything from 20 seconds to 30 minutes, depending on the closeness of the fit. Press this
assembly into the bearing holder 4448.14 as far as it will go, then slide the front bearing onto
the shaft, together with a drop of bearing retainer fluid 603. Slide the bearing straight into the
correct position, and press it into the bearing holder as far as it will go. Now - before the adhe-
sive sets - check that the shaft is still free-moving; it is important that the bearings should not be
stiff; this is usually due to excessive axial stress. If this happens, tap lightly on the end of the
shaft in the axial direction, using a screwdriver handle or similar, or tap harder on the bearing
support, until the bearings ease into the correct position and the shaft turns freely. Now allow
the bearing retainer fluid to cure fully.
Fit a shim washer and the pinion 4450.41 on the front end of the shaft, press it against the front
bearing and secure the pinion in this position using two grubscrews: first apply a drop of thread-
lock fluid (Order No. 952) to the threaded hole and fit the first grubscrew, taking care to position
the pinion so that the screw engages on the flat machined in the shaft. Rotate the pinion to and
fro on the shaft so that the grubscrew takes up the optimum position, then tighten it moderately.
Now screw in the opposed grubscrew and tighten it very firmly before finally tightening the first
grubscrew permanently. This procedure ensures that the pinion runs really true on the shaft.
1.2 Assembling the layshaft
(bag UM-1B)
Fix the bottom bearing 4450.31 for the layshaft 4450.7 on the shaft, using bearing retainer fluid
603, Order No. 951. Position the bearing resting against the pinion, then leave the fluid to cure.
Press the shaft and bearing into the bottom bearing support 4448.11.
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