There are snap rings retaining the bearings that will require removal of everything as an assembly.
On Mon, Aug 17, 2015 at 7:49 AM, Michael Stockhill <[email protected]> wrote: > Guy, > > You will need to remove the brake assembly/spacer etc to remove the wheel > and tire and to replace or service the bearing. > > MLS > > On Mon, Aug 17, 2015 at 5:51 AM, Guy Audenaerde <[email protected]> > wrote: > >> I found a more detailed drawing of the wheelassembly, i think this might >> help, unfortunately the left side is not completely in the picture... >> I did not loosen or remove the bolts holding the brakeassembly to the >> wheelfairing, but read in the mails that this is compulsory for good result. >> Is it necessary to remove the brakeassembly in order to get the wheel out >> of the fairing once the axle is removed? >> I was thinking to combine the special extracting tool with the CO2 >> method. >> I was told to heat the axle from the inside with a very mild flame to >> about 60 degrees celsius and let the warmth soak into the outer spacertubes >> during 20 minutes. >> Once these spacertubes are warm ( and expanded ) one should rapidly cool >> the axle with Co2 or other cooling gas/liquid in order to make it shrink in >> diameter, thus freeing it from the >> expanded outer spacertubes. >> I start work on the extractor-tool, >> Guy >> >> >> *-------Oorspronkelijk bericht-------* >> >> *Van:* salto <[email protected]> >> *Datum:* 17/08/2015 5:33:46 >> *Aan:* [email protected] >> *Onderwerp:* RE: [DOG mailing list] Removing wheel axle >> >> >> When overhauling the wheel bearings of my H-36 some years ago I found >> that the bearing seals were totally ineffective. The Cessna felt seal and >> support washers were in place but the internal diameter of the seal was >> 0.125” larger than the steel collar on which it was supposed to bear, thus >> leaving an air gap all the way around the bearing where water, dust & mud >> could enter. This clearance was undoubtedly the cause of our bearing >> failures, especially in Australia’s dusty airfield environment. Hoffman >> were not interested in this problem so we solved it by removing the Cessna >> felt seal and alloy washers and substituting a neoprene automotive seal >> with the same outer diameter but with a smaller internal diameter which >> matched the steel collar. The seal is a readily available size & is >> commonly fitted to trailer & caravan wheel bearing hubs. Other Australian >> operators addressed the problem by retaining the original felt seals & >> washers but replacing the steel collar with a new one machined to the >> correct outer diameter to fit the original felt seals. Either approach >> works quite well, but if you decide to make new collars ensure that you add >> a small chamfer both sides of the internal bore of the collar to ensure it >> bears only on the flat bearing faces. >> >> Hope this helps >> >> J G Viney. Dimona Lisa VH-GVQ >> >> >> >> *From:* [email protected] [mailto:[email protected]] *On >> Behalf Of *Michael Stockhill >> *Sent:* Monday, August 17, 2015 12:58 PM >> *To:* [email protected] >> *Subject:* Re: [DOG mailing list] Removing wheel axle >> >> >> >> Reviewing the H36 parts book that I have, the drawing of the >> wheel/axle/brake assembly is very small scale, with few callouts for >> parts. One thing that is evident is that the axle nut and lock washer are >> on the outside of the wheel fairing. In the two aircraft I maintain, both >> had the axle nuts inboard, with the axle inserted from outboard, resulting >> in interference of the axle nut and lock washer with at least two of the >> four attachment bolts that secure the brake mechanism mounts. While it may >> be "prettier" to have the axle nuts inboard, it is probably best to go with >> the configuration shown in the parts book. In my instance, I thought of >> reassembly that way, but elected to use the countersunk screws as a minor >> alteration, which we can do in this country as mechanics if we are brave >> enough. >> >> >> >> Besides the four attachment bolts, there are an additional four securing >> a flange for the floating brake caliper. On one or two of the four brakes >> I worked on, these had to be loosened or removed in order to provide >> clearance for removing the caliper. Each caliper is located by two rods of >> about 7/16 diameter and an inch or so in length. If the rest of the wheel >> assembly is corroded, it is probable that these are also corroded. They >> can and should be cleaned and polished. The outer portion of the bore on >> the cylinders is also likely to show corrosion. It is a judgement call, >> but I am usually comfortable with cleaning up that corrosion with >> Scotchbrite or similar products. Best to avoid steel wool as particles >> will embed in the aluminum of the cylinder. Pistons can similarly be >> salvaged. Braking action is significantly improved when this corrosion is >> cleaned up. >> >> >> >> Removal of the bearings from their spacers may necessitate fabricating a >> tool for a press or bearing puller. If I recall correctly, the ID of the >> bearings is 31 or 31.5 mm, and the axle is 30 mm diameter. The spacers have >> a shoulder on them. A tool would have similar configuration, with an OD of >> 31 or 31.5 mm, and a shoulder, with an OD of 30 mm. >> >> >> >> Problematic was getting all the air bubbles out of the brake lines when >> bleeding them (best done from the bottom). There is a flexible aircraft >> hydraulic hose or line downstream of the master cylinder that can trap air >> bubbles. Another more gifted Dimona mechanic told me that raising the tail >> can often cause those bubbles to be displaced. This worked for me on both >> aircraft, with the tail raised about three feet or so. >> >> >> >> Surely clean up any corrosion on the inside of the axles. And think of >> the next guy when reassembling, using Boeshield or similar products for >> corrosion control and maybe antiseize materials. >> >> >> >> If all else fails in attempting to remove the axles, consider that >> Lycoming's technique for removing seized sparkplugs is to make a funnel >> over the sparkplug and chill it with a blast of CO2. One could probably >> shoot CO2 through the bore of the axle and shrink it away from the spacers! >> >> >> >> MLS >> >> >> >> On Sun, Aug 16, 2015 at 6:00 PM, Michael Stockhill <[email protected]> >> wrote: >> >> A revisionist thought. If the axle is truly seized, it is likely to be >> seized on the the sleeve/carrier assembly for the brake caliper as well as >> the opposing bearing carrier tube. It may be best to leave it unloosened >> until the axle has broken free. Sorry for the poor thinking on my feet >> today. I should get out the parts book to refine my terminology. >> >> >> >> >> >> MLS >> >> >> >> On Sun, Aug 16, 2015 at 5:48 PM, Michael Stockhill <[email protected]> >> wrote: >> >> Yes, those will have to come out eventually. I would just loosen them >> until you get the axle out. I did find during reinstallation that if I >> tightened them before everything else was assembled, that the axle would >> bind at insertion. If anyone else has done brake and tire work on the >> aircraft previously, you may find that the holes in the brake attach plate >> have been elongated--it looks like during reassembly someone didn't get >> proper alignment and just went after them with a drill bit. . On both of >> our ships, that was the case. Going to the slightly oversize 1/4 inch >> countersunk machine screws (vs 6 mm bolts) mitigated that a bit. Keep >> track of which brake assembly goes on each side of the ship. >> >> >> >> Photos tomorrow. I took advantage of good WX to fly my PIK 20E for a >> couple hours, and did the shuffle/dance to drag my Aztec out of the hangar >> for test flight after maintenance. >> >> >> >> Cheers, >> >> >> >> On Sun, Aug 16, 2015 at 5:36 PM, Nils Beck <[email protected]> wrote: >> >> Did you also remove the 4 bolts that attach the brake to the wheel >> fairing? >> >> Best regards >> >> Nils Beck >> >> >> >> >> On 16.08.2015 14:18, Guy Audenaerde wrote: >> >> My Dimona H36 Mk2 ser. 36267 build in 1988, equipped with Sauer >> S2100-1ss1 has 4550 hours on the airframe. >> >> It is three years in my ownership and i suspect that the maintenance of >> the main wheelbearings is urgently due. >> >> When i jack up the wheels and rotate the wheels they emit a "grinding" >> noise and have a lot of play. >> >> Question: can someone give me a detailed procedure for removing the axle >> and overhauling the wheelbearings. >> >> I removed the locking nut on the outside of the wheelfairing but did not >> succeed in getting the axle out of the fairing, >> >> despite carefull tapping on the extremities with a hardwooden block. >> >> I suspect that the pipes that hold the bearings in place are froozen on >> the central axle and prevent this axle of sliding out of the fairings; >> >> >> >> Awaiting 'instructions' >> >> Guy Audenaerde >> >> >> >> >> >> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150816> >> >> *GRATIS animaties voor je e-mail* >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150816> >> >> *Klik hier!* >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150816> >> >> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150816> >> >> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150816> >> >> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150816> >> >> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150816> >> >> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150816> >> >> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150816> >> >> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> GRATIS >> animaties voor je e-mail >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> Klik >> hier! >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> <http://www.incredimail.com/?id=621163&did=10501&ppd=2842,201206281824,19,1,1&rui=146739762&app_test_id=0&sd=20150817> >> >> >> --------------------------------------------------------------------- >> You are subscribed to the Dimona Owners Group mailing list. >> To unsubscribe, send email to: [email protected] >> > >
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