Mailing List lml@lancaironline.net Message #49848
From: Bill Wade <super_chipmunk@roadrunner.com>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] IV Main Gear Setup- lessons learned/ Correction
Date: Thu, 11 Dec 2008 21:51:29 -0500
To: <lml@lancaironline.net>
 At some point between my workshop and my laptop I got mixed up. The LH rack sets up fine, the RH is the one that had the grease groove exposed at the end. I apologize if this created any confusion. -Bill Wade

----- Original Message ----- From: "Bill Wade" <super_chipmunk@roadrunner.com>
To: <lml@lancaironline.net>
Sent: Monday, December 08, 2008 1:55 PM
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.
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.
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



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