Adjustment Of The Gear Play - Henseleit Three-Dee RIGID User Manual

Then pull the shaft in the play against the upper bearing and measure again, how far the shaft protrudes now. The difference
of both measurements represents the amount you have to add – in the form of spacer washers – between the upper bearing
and the spacer. Only unscrew the upper frame plate once again and pull it to the top and out of the mechanics, to slide the
spacer washers onto the rotor shaft. Then re-mount the plate again check for the play again.
A minimum play of one tenth mm has not any negatives effects. Anyway, after some flight hours it can be necessary to check
the entire system and to adjust it by adding further spacer washers, if the unit has set.
Adjustment of the axial play and assembly height of the intermediate shaft
For the intermediate shaft proceed in the way as for the rotor shaft. However please note that the steel pinion 0516 is
positioned in the same height than the main rotor shaft gear 0416. According to this, you can add spacer washers underneath
the upper frame or above the crown gear flange 0526, until it suits well.
If it is necessary to put thinner than the 0,5mm washers above the steel pinion 0516 you have to add the difference between
this pinion and the one way bearing flange 0518 so that the position of the gear wheel 0516 is not to high in the gap of the
frame to prevent a contact.
Fill up the other gaps between the different flanges with additional washers until there is no axial play any more in the unit.
Attention ! the grub screw of the crown gear flange and the screws of the lower bearing support from the intermediate shaft
unit is still not finally tightened
Then place the mechanics again on an even surface and tighten the screws of all frame plates well (excluding the lower
frame plate of the intermediate shaft).
Only the upper screw of the two tail boom holders is tightened slightly.
Adjustment of the gear play and the pinion position of the tail drive
At first, press the already prepared tail boom through the two tail boom holders, until the pinion is positioned above the crown
gear such that the two edges congruently create a parallel line (see yellow lines).
If the tail boom jams in the front aluminium holder, grease it a little and force its slot apart using a screw driver (put it into slot
and turn it).
If the tail boom cannot be inserted far enough, because the teeth of both gears already contact, you have to unscrew the
lower bearing flange once again and put correspondingly thinner spacer washers below the crown gear to give it a lower
position. According to this, you have to compensate for the difference above the crown gear flange the by adding spacer
washers, in order to avoid an axial play of the intermediate shaft.
Attention ! You have to try several times. So you have to mount the lower frame plate provisorily to the attachment screws
again and again to prevent the intermediate shaft from tilting to one side and from being positioned in an inclined way. The
plate can easily be pulled down and removed from the mechanics.
This way you find the correct combination of spacer washers above and below the crown gear flanges with its crown gear
until you notice a small play between the teeth edges (you hear a low ticktack when turning at the pinion) when turning the
pinion and holding the crown gear.
Always turn the crown gear some teeth further and thus check the play at different positions. There are always certain
tolerances and you will notice a smaller or larger play at different positions. It is important that every position has a certain
play and that there is not any position without a play. Now you can tighten the screw of the lower frame plate and the grub
screw of the crown gear flange. Please ensure that the grub screw is positioned on the flat area of the intermediate shaft.
Attention ! Please apply Loctite only on the side of the thread of the grub screw, but not to the hole of the flanges. Otherwise
the Loctite is pressed through the threaded hole on the shaft. This would make a later disassembly extremely difficult!
yet).
First mount the preassembled bearing flange
0828a (see page 14) with the two M3x6 screws
at the front of the boom (short distance from the
centre of the hole to the front edge of the boom).
Than adjust the right gear play.
No play, a too small play or the wrong positioning
of the pinion in relation to the crown gear (tail
boom is pushed in too far or not far enough) can
lead to increased noise emissions and to
vibrations in the entire drive, which can result in
vibrations around the vertical axis or negative
influences on the V-Stabi sensors. The entire
helicopter will then hover nervously.
Too much play mostly leads to increased
operating noises.
Therefore, adjust the gear play and the pinion
position diligently (see description).
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