Graupner
GmbH & Co. KG * Henriettenstraße 94-96 * D - 73230 Kirchheim/Teck
*
www.graupner.de
Stand: 2010
18
Appendix
Assembly, dismantling and installation of
the airbrakes.
Some model airbrake systems tend to be
problematic, particularly the longer units as
they tend to stick, either when opening or
closing at higher air speeds. The units
supplied in this kit incorporate a centre latch
and an over-centre locking mechanism
system which totally alleviates this problem.
The airbrake is also designed to be entirely
dismantled, even once installed, but some
care is required when handling the
mechanism. Please follow the instructions
for assembly and disassembly.
Note: When the airbrake fully
assembled and closed it is possible
that you may find it difficult to open
as the mechanism is locked. Do not
apply any force as doing so will
invariably result in damage. To open
the airbrake, hold the assembly as
you would a pencil and tap one end
sharply on a solid surface to release
the brake. Then carefully lift the
blades out of the brake box.
Dismantling:
The entire airbrake mechanism can be
dismantled. This can be useful when
installing the brake box for the first time or
when replacing worn or damaged parts:
With the airbrake extended, carefully lift the
top blade upwards to remove. The lower
blade is easily removed by pressing on each
retaining point with a fingernail. The leavers
can also be disengaged from their shafts by
gripping them firmly with a small pair of
pliers and carefully twisting sideways. Note
that the actuating lever on the left-hand
airbrake may only be removed if the plastic
lever is first laid horizontal after it has been
disengaged from its shaft.
Assembly:
Left-hand
airbrake:
the
actuating
mechanism may only be inserted into the
guide block when the plastic lever is held
horizontal. Position the opening in the
plastic lever over the shaft and press it down
firmly onto the shaft with the aid of a
screwdriver.
Right-hand airbrake: The lever can be in any
position. Insert into the guide block and
proceed as above. Hold the levers erect and
press the lower blade carefully onto the
retaining lugs. Note that the angled end of
the blade must face the actuating
mechanism otherwise it will not close.
Again with the levers erect, position the
upper blade on the pivot points and press it
down firmly by hand. Again ensure that the
angled end of the blade is facing towards the
actuator.
Check that the airbrake opens and closes
smoothly.
Installation:
The control linkage is connected inside the
airbrake box. For this reason, it is advisable
to remove the blades so as to gain
unrestricted access to the mechanism.
Solder a clevis adaptor to one end of a Ø
2mm. Steel pushrod and install a clevis
adaptor. Now install a sort piece of Bowden
tube running from the airbrake cavity to the
servo cavity. Press the end of the Bowden
tube into the end of the airbrake box and
secure with glue. Insert the pushrod and
secure the clevis to the hole in the actuating
arm in the airbrake box. Connect the other
end of the pushrod to the servo output arm,
reinstall the blad.
