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Date: Tue, 09 Dec 2008 08:43:39 -0500
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Subject: RE: [LML] IV Main Gear Setup- lessons learned
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Thread-Topic: [LML] IV Main Gear Setup- lessons learned
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From: "Steve Buller" <sbuller@emmett.org>

Bill
I now understand your photo in your other posting. You must have had a
mix-up in attaching photos.
Steve

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of
Bill Wade
Sent: Monday, December 08, 2008 1:55 PM
To: lml@lancaironline.net
Subject: [LML] IV Main Gear Setup- lessons learned

This may save someone a few days:

 While I had the main gear box out of the fuselage and clamped upright I
went to install the grease blocks. I found the second set of holes that
Lancair had drilled made the blocks extend beyond the rack housing so I
opened out the original, centered holes. That worked fine with the RH
rack.=20
Trimming 1/8" off the end of the rack and using a bottom tap in the hole
made for a good fit with room to install the down switch striker plate.

  After loosening/tightening the cylinder plugs and mopping up oil
spills each time I moved the piston I skipped way ahead to page 26-35
and installed the fittings. Connecting the fittings together with
temporary tubing assemblies allows the cylinders to move freely with no
mess and no dirt getting in.

The LH was a different story. The grease block hit on the thickened
section (where the cylinder ram attaches) before the gear was fully
retracted. If the block was repositioned forward in the 'new' holes so
there was no interference then it extended beyond the rack far enough to
expose the grease groove. This meant that when the fitting was greased
it would all escape instead of spreading evenly as intended. I could not
come up with a good fix for this. As far as I can tell the pinion gear
is indexed 1/2 tooth different from the RH side in relation to the leg.
The gear is not reversible. After a lot of trimming, fiddling and
fussing the best I can come up with is to roughen a short section of the
groove and fill it with JB Weld. The stuff can be trimmed level with a
razor blade after it sets. The plugged section extends under the end of
rack when the gear is fully down.=20
I'm open for other solutions.

  I also installed the strikers and microswitches (19-123). I think
using a VOM audio signal or light circuit gives a more positive contact
indication than a "Click", but that's just me.

  As far as I can tell the instructions don't mention this- I was told
by tech support that the rack housing through bolts are tightened so the
sleeves push against the grease block and lock it into place. The block
is supposed to be wider than the rack for clearance. It's not. I'm going
to make a shim from .010 brass or stainless and bond it to one side of
each grease block. Maybe with crazy glue- it only needs to hold until
the screws are tightened.

  My admiration grows for those who have managed to complete their
lanes...  -Bill Wade=20