(Bag 9-
II
)
At first push only the bevel gear 0902 and the spacer 0907 together provisionally between the two bearings of the gear box
(do not yet add the spacer washers).
Put the tail output shaft 0910 through the unit. Press the bevel gear against the bearing and now check the play between the
two bevel gears.
By axially moving the bevel gear 0902 on the tail rotor shaft you can now determine the approximate position where the tail
gear has its lowest play and the bevel gears do not jam (it is recommended to leave a small play).
Some spacer washers (Set 0907a) of 0.2 mm and a spacer washer of 0.1 mm marked with black are added to the bag. If
necessary, you can install them between the bevel gear and the left flange bearing or between the spacer 0907 and the right
bearing or between the bevel gear and the spacer to adjust the gear play. The unit may not have any axial play on the shaft
0910 any more.
Sometimes it is not easy to apply the washers, since you cannot push through the tail rotor shaft.
It is helpful to use a second 5 mm shaft which is sharpened on one side and pushed through the holes before, so that the
washers are centred.
It is intended to position the washers such that the tail rotor shaft does not have an axial play and that the gear play is not too
large, but not too small after having tightened the grub screw 0902a.
For this purpose turn the tail output shaft. The bevel gears have to run smoothly in every position and must not jam.
Experience shows that the gear wheels are run in after some flights, so that the gear play still increases to a minimum extent.
Now tighten the grub screw using Loctite. Only apply Loctite to the grub screw thread but not to the thread hole.
When tightening the grub screw make sure that it grips the flat area. Pull the tail shaft in the play of the flat area as far as
possible to the outside, so that it protrudes from the box as far as possible on the side where the tail rotor is later attached.
(Bag 9-
III
)
26
The tail pitch connecting rod 0916 is delivered as a complete
unit. The tail pitch connecting rod arms 0915a and the pins
0915b can be ordered as single spare parts, because only the
plastic arms usually break during crashes.
The pins are inserted on the side in the hole of the brass
connecting rod and are locked into the tighter holes of the
plastic arms. They are not tilted in the plastics but in the holes
of the connecting rod.
Attention ! Do not use any Loctite.
