---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sun 07/28/24: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:05 AM - Re: CJ6A tach generator, cleaning? (rolif6) 2. 02:48 PM - Re: Re: Yak-18T main LG shocks air/oil filling procedure (michael@wikstrom.cc) ________________________________ Message 1 _____________________________________ Time: 11:05:28 AM PST US Subject: Yak-List: Re: CJ6A tach generator, cleaning? From: "rolif6" When it comes to maintaining the efficiency of tach generators, regular cleaning is essential. A tach generator, which measures the rotational speed of a shaft, can accumulate dust and debris over time, potentially affecting its accuracy. To ensure optimal performance, it's important to follow a cleaning routine that includes gently wiping down the generator with a soft, lint-free cloth and using compressed air to remove any particulate matter from hard-to-reach areas. As Dana (https://surfacekingz.com/) emphasizes, keeping the tach generator clean helps prevent inaccuracies and prolongs the life of the equipment, ensuring reliable performance in various industrial applications. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=513741#513741 ________________________________ Message 2 _____________________________________ Time: 02:48:00 PM PST US From: michael@wikstrom.cc Subject: Re: Yak-List: Re: Yak-18T main LG shocks air/oil filling procedure Hi Vic, Thanks for your recent input on my shock issues. I've checked the main gear pressure, both bottom and top. The bottom part has 65 kg/cm2 and the top part has 18 kg/cm2 The front shock has bottom 70 Kg/cm2 and top has 20 K/cm2 - This shock works fine. I've not checked for oil yet. What I don't understand is, with the aircraft empty (60L+60L fuel) with no-one inside, the main gear shocks are half compressed, and she is sitting statically at quite an angle, to the rear. If I measure the ''shiny'' part of the shock, which when on jacks, measure 290mm, goes down to about 200mm when the jacks are removed. If I fill up fuel and put 2 persons inside, the shocks compress almost completely. What I'm wondering is, that as my aircraft is an earlier model yak18t (1979), maybe I'm, using the wrong pressure settings? Maybe the top part should have higher than 18 Kg/cm2? I got the readings from the only yak18t description manual that I have. Vic, can you confirm that it is pressure in the top part that determine the static position of the aircraft? Note that I have no visible oil leaks, and no pressure leaks either Thanks for any input that might help Michael Wikstrom Yak18T - F-HMSS On 2024-07-09 16:59, Vic wrote: > > Hi Michael, > there are two places for pressurizing the lg struts: You checked the bottom filling valve but that is just for extra hard landings when a second piston gets active, which is sitting in the top of the hard chromed inner telescope. This filling does nothing for the standing height. Look way up at the painted outer section of the lg strut, there is another filling valve next to the brake hose, see photo below. There you can add oil or change it by fully compressing the strut to get old oil out. Dont know about the amount of oil but you found some numbers. Anyway, at the top filling valve you can add some more air, nitrogen no real argument. But dont do excessive pressure, it would give you a harsh ride. Id want some angle in the brackets that align the wheels for parallel tracks. > In case you disassemble the whole landing gear Id suggest to bin these old felt seals at bottom , they collect a mass of dirt and lead that into the strut and destroy bushes and hard chrome. Better have real dirt wiper seals there, like on motor bike teles, saves you precious hard chrome restoration costs. > > cheers > Vic > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=513682#513682 > > Attachments: > > http://forums.matronics.com//files/p1040077_352.jpg > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.