Installing The Bellcrank And Control Bridge - GRAUPNER heim UNI-Mechanik 2000 Mode D'emploi

UNI-Mechanics 2000
meshing clearance between the bevel gears, as if under maximum load. Now check that the tail
rotor gearbox runs smoothly, with just detectable meshing clearance in the bevel gears.
If the play in the gears is too slight, i.e. the gears are stiff to move, you will need to remove the
drive assembly again and remove the shim washer under the bevel gear. If, however, there is
too much play in the gear meshing insert additional shim washers. If you work carefully, making
small adjustments, it is possible to set up the bevel gears so that they work freely but without
backlash. Reinstall the unit, repeat the pulling procedure as described above, and you should
find that the gear meshing clearance is correct.
Note: if you still cannot set the gear meshing clearance to your satisfaction, the problem may be
that the bevel gear on the tail rotor shaft is located too far outward due to manufacturing
tolerances, and is not engaging correctly with the bevel gear on the input shaft. If this is the
case, you will find that the tips of the teeth of the bevel gear 4618.41 are already fouling the
spacer sleeve 4450.28A, and yet there is backlash in the meshing clearance. In this case you
must fit the shim washers between the bevel gear 4618.38 and the bearing 4450.22, instead of
between the spacer sleeve and the bearing 4618.69, until the desired slight meshing clearance
is present.
Now remove both assemblies again, apply bearing retainer fluid, Order No. 951, to the bearings,
the setscrews, and the bevel gear on the input shaft, re-fit them on the tail rotor shaft and the
input shaft, and assemble the parts permanently.

5. Installing the bellcrank and control bridge

(bag U2-11B)
Press the ballraces into the tail rotor bellcrank 4682.160, not forgetting the spacer sleeve, and fit
the M3x20 socket cap screw through the bellcrank. Fit the spacer washer on the screw as
shown.
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