hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Mon Apr 21, 2008 10:00 am Post subject: Allegro-List Digest: 1 Msgs - 04/20/08 |
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Thom:
I have no shimmy in my front gear. Removing the draw bar is very simple.
Remove the 8 mm castellated nut and remove the 8 mm bolt. The forked end of
the draw bar should slide down off of its attachment (draw bar attachment
bearing) which is permanently attached to the nose gear aluminum pipe. Then
you can remove the steel pin from the back grasp fork and remove the bar
itself.
As you know I built my Allegro 2000 (Model year 2004). I am quite familiar
with the subject "draw bar". My draw bar came factory assembled, ready to
install. In the process of installing the front landing gear (which also
came fully assembled) and the back grasp fork which is field riveted and
fiber glassed on to the belly of the fuselage by the builder, I got some of
my measurements slightly off and had to slightly lengthen the draw bar
assembly.
This required me to purchase a new steel tube (7/8"x0.065", 4130 Alloy round
seamless steel tubing, MIL-T-6736 Normalized and annealed) slightly longer
than necessary, make field measurements, and cut the tube to the correct
length taking in to account the two end pieces, drill, and re-rivet
(stainless steel rivets) the two draw bar end pieces back on to the tube. I
suspect that over time and many landings either the front or back piece has
been slightly "wallowed" out allowing some "play" to develop. Carefully
inspect the bored hole through the back grasp fork and the draw bar
attachment bearing on the front gear. If these holes are "wallowed" any you
will have to replace more than the draw bar itself. I have two assembly
drawings from my assembly manual that may help you. I will be glad to fax
them to you if you want them.
If you don't have any "wallowed" out end pieces, or "wallowed" out back
grasp fork, or a "wallowed" out draw bar attachment bearing on the front
gear, then all you need is the draw bar itself. You need to make sure that
the replacement draw bar part from Fantasy Air will truly "fit" back on your
plane. I would do every thing I could to assure that it will fit with out
any field work on your part before you order it from Fantasy Air. If there
is the slightest doubt, you might consider just ordering the tube slightly
longer than required, cutting it to length from field measurements and
fixing it the way I did. The tube cost only about $5.00. Let me know if you
want the two assembly sheets I referred to.
Hugh McKay
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