GRAUPNER heim Starlet 50 Mode D'emploi page 73

Starlet 50
3.2 Installing the blade holders
Press the two O-rings 4607.28 into both sides of the rotor head hub 4682.26, grease the blade
pivot shaft and slide it through the O-rings. Set it exactly central, i.e. projecting by an equal
amount on both sides. It is important that the shaft does not push the O-rings out of their
seatings. Now hold this assembly with the blade pivot shaft standing vertical. Fit a 0.2 mm shim
washer from 4450.56 on the shaft from the top, followed by a blade holder, noting that the
holder must be the correct way round: the mixer lever on the blade pitch arm must be located in
front of the blade (see drawing). The blade pivot shaft should now project into the shell of the
combination bearing 1254.13 at the top.
Fill the bearing shell with grease, and place exactly 14 steel balls in the shell, where the grease
will prevent them rolling about.
During this procedure the blade pivot shaft must always project far enough into the bearing shell
to prevent the balls falling inward, between the blade holder and the blade pivot shaft.
To complete the first end of the blade pivot shaft, fit the thrust washer of the combination
bearing on top, with the ball channel facing inward, and tighten the M5 x 12 socket-head cap
screw.
Turn this assembly over, so that the blade holder you have just installed is at the bottom, and fit
the second blade holder on the blade pivot shaft using the same procedure, not forgetting the
0.2 mm shim washer.
Take great care not to allow the blade pivot shaft to project too far through the hub and blade
holder, otherwise the balls may fall out of the combination bearing you first assembled!
The second combination bearing can now be completed following the procedure outlined above.
Tighten the M5 x 12 socket-head cap screw.
Check that both blade holders rotate freely, and if necessary tap the holders and hub with the
handle of a screwdriver so that the bearings seat themselves properly; this procedure helps to
remove any stress from the bearings.
If the blade holders are stiff to move because they are being pressed against the hub, fit a
spacer washer 4450.57 between the thrust washer of one of the combination bearings and the
blade pivot shaft.
If you have to dismantle the combination bearing, take care that no balls fall out!
Once you are confident that the blade holders swivel freely, apply thread-lock fluid to the M5 x
12 socket-head cap screws and tighten them fully. If it was necessary to fit a spacer washer
4450.57, be careful when tightening the socket-head cap screws, otherwise the brass washer
could be pushed out of shape.
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