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yakflyr(at)comcast.net
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 Posted: Thu Jan 05, 2006 8:54 am Post subject: Yak 52 Hose Source |
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My new (to me) 1993 Yak-52 had never had the gear actuators overhauled. I can kind of see why; it's a nasty job to remove and install them. To avoid that area for a while I replaced the hoses at the same time. Doug Sapp made beautiful new ones, even the oddball one with the 180 degree fitting. Fast turnaround and very reasonably priced too.
Mike Bell
Yak-52 N444JA
Elk Grove, CA
yakflyr(at)comcast.net (yakflyr(at)comcast.net)
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rvfltd(at)televar.com
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| Posted: Thu Jan 05, 2006 8:37 pm Post subject: Yak 52 Hose Source |
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Mike,
Many thanks for the kind words.
I was amazed to discover how close in length the CJ hoses were in comparison to the 52 hoses. In every instance all that needed to be done was to shorten the CJ hose to the proper length as fitting size was exactly the same. I have set up a "assembly and test" bench where I can assemble hoses and overhaul gear retract actuators and check them for leaks with high pressure air. As the price of replacement actuators goes up it makes more and more sense to overhaul instead of buying new.
In the actuators that I have overhauled (over 20 now) the number one problem has been paint and debris being pulled back into the cly via the ram which damages the 0 rings causing the unit to leak. So if you paint your actuators do so with them in the retracted position or mask off the ram very carefully. Don't gob a bunch of grease on the ram thinking you are doing it a favor, you are not, doing this will simply give the dirt and junk a place to hide until it finally gets pulled inside by the retract action of the ram. The second biggest cause of failure is caused by water in the air system which causes rust on the cly wall which in time either abraids the 0 rings or causes so much pitting that the 0 ring cannot do its job. When this happens you have big trouble because the actuator is not rebuildable. If you maintain the desiccant filter and oil the pneumatic system at the proper intervals and you will minimize this (and many other) problems.
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