More Landing Gear Work (10/25/13)

3.0 Hours –

One of the recommended bearing greases listed in the manual for the Matco wheel bearings is Aeroshell 22.  Since this is a multipurpose grease that can be used for just about anything on the airframe, I decided to order some, and it will probably become the primary grease I use.  Once the grease arrived, I watched a few videos on how to pack bearings, and then went into the garage to give it a go.  The first bearing took me about a half hour, and I had grease everywhere!  After changing gloves and loading my palm with another dollop of grease, the remaining bearings took just a couple of minutes each.

I also received some .020 shim stock from Onlinemetals.com.  Onlinemetals.com will make custom cuts, so I ordered several strips of aluminum cut to 3 feet long and 0.5 inches wide.  This width is perfect for shims, but the website lists a 1/8″ error margin on all cuts, so I also ordered a 1 foot by 2 foot sheet of aluminum that I could cut myself if needed.  Fortunately, the strips were cut perfectly and should work well for shimming the cowl hinges.

I bought some .020 shim stock from Onlinemetals.com. The best part is that they cut it into 1/2″ wide strips for me.

With the shim stock in hand, I cut two sections for shimming the lower edge of the bottom cowl.  Once the shims were cut to length, I match drilled them to the firewall.  At this point, instead of cutting and drilling the hinges, I decided to switch back to the landing gear.  I did this mainly because the two main gear legs were taking up a lot of room on my workbench, and I just needed to do a couple of things to them before I could move them back down to the floor.  The cowl hinges will have to wait!

I’m still a little confused about how the brakes are installed.  The Matco brakes are a two-part assembly consisting of the brake caliper and a flange.  The only aspect I am clear about is how the flange bolts to the gear leg.  Once the flange is bolted on, the caliper can be installed.  What is confusing me is that the caliper seems to “float” on the flange.  It has two posts that slide into openings on the flange.  There are no bolts that lock it into position, so I can only assume that the disc holds the caliper in place (once the wheel is installed).  Still a little confused, I went ahead and installed the brake flanges on the main gear.  Hopefully everything will become clear once I have the wheels and calipers in place.

One of the Matco brake assemblies.

Another view of the brake assembly. The parts are zip-tied together because the caliper floats on the mounting flange. I’m struggling to visualize how this works…hopefully it will become clear once I have them on the wheels.

One of the brake flanges mounted on the main gear. The caliper posts slide into the large openings on the top and bottom.

Another view of the brake flange on the gear.

The same brake, now with the caliper in position.

Same brake assembly…different view.

Next, I made the six spacers that are needed for bolting the U-610 wheel pants brackets to the brake flanges/main gear legs.  These are simple 13/32″ long sections of aluminum tube that act as standoffs for spacing the bracket from the brake disc.

Several spacers had to be made for mounting the U-610 wheel pant brackets on the brake flanges. These spacers are each 13/32″ long.

Finally, I deburred and primed the U-610 wheel pants brackets.  Along with the brackets, I also primed several parts for the canopy gas strut anchors since those had just been sitting on my workbench waiting for a larger batch of parts that needed to be primed.

I deburred and primed the U-610 wheel pant brackets. I also primed the canopy strut mounts since those had just been sitting on my work bench.