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#1
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Upper Door Lift Mechanism - Gas Springs?
This thread went sort of silent around the end of 2007. Does anybody have any updated information?
I also have been experiencing problems with my lift mechanism. The Seals and O-rings are standard items, totalling less than about $5.00, but I still cannot seem to get it to stay charged. Can't muster the nerve to spend 23,000 for a new assembly ( not going to comment on the Cessna Pricing Policy ). I have been investigating suppliers of the Gas Springs that Mr. badboy82 speaks of in his first post. I believe I may have found a supplier in Germany with the quality worthy of use in aircraft. The website is www.stabilus.com. Has anybody had experience with this company, or is there another company out there somewhere. I would need to so some measureements on stroke travel, forces, etc. Are there any engineering guidelines out there with respect to additional safety margins to be applied to the lifting force required to lift the door? Any information would be appreciated. Regards,........ Barry Sloane, N187 
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#2
03-13-23, 11:58 AM
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Servicing the Door Lift Assist Assembly
My door lift assist on my '77 NA G model was acting a little hinky, sticking on closing and not fully opening door, and occasionally leaking a little hydraulic fluid. A quick check of the service manual revealed a servicing checklist. As Skymaster jobs go, this one is "easy" and took about an hour to do, start to finish. Lift assist works really well now.
Attached is a PDF servicing guide, for your enjoyment.
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#3
03-13-23, 01:57 PM
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Good info LearJetter! The instructions are pretty similar for the 1978-1980 models. Below you will find them, plus another diagram. Interesting that it calls for shop air, not nitrogen, to refill the accumulator.
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#4
03-15-23, 01:15 PM
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Just ordered a set, thanks a lot for this post update!
I just need to find a replacement for the plastic friction sleeve thingamajig...or make one from UHMW polyethylene plastic rod and mill one down. Last edited by ljmolina : 03-15-23 at 01:19 PM.
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#5
03-16-23, 11:59 AM
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Quote:
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#6
03-16-23, 01:31 PM
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Quote:
I just ordered a set of the o-rings, and seals thats in the pdf for less than $10 ($6.22) free shipping. When I bought N187 from Barry, he replaced the o-rings in the lift assembly awhile back, If I have any issues with it in the future at least I'll have a set of the o-rings on hand.
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#7
03-16-23, 02:39 PM
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If anyone is going to do this, please document the removal of the interior panels. I know its probably not hard to figure out, but pics beforehand really help to understand the job.
If your door just seems to lag a bit, where you do have some lift but have to use the friction lock to hold it at the top, would a small burst of shop air or nitrogen be appropriate to give it that last little bit of push? Surprisingly, the manual gives no recommended pressure, just say basically to fill with shop air until the door opens correctly.
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