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Gear Checkvalve

Re: Gear Checkvalve

Hi Michael, did you completely flush the hydraulic system by looping all 3 gear actuator lines and dumping e-valve so fluid will flush thru entire system? Pumping fresh fluid from the pressure side and back thru the return at the pump before connecting the new one is essential to get all the burnt/contaminated fluid out. I can't stress how important this is.

Michael Boyd said:
We have the plane on jacks now and will see if it sags overnight. Again, the last time we put the gear up it has become rock solid. This reflects what it is doing on test flights - perfect for a bit and then the transition light. During the past weeks we have capped off each actuator and they were golden.

A new power pack was installed a few weeks ago and now we are considering contaminants that come and go that may cause a seal issue. Just an inconsistent situation. The gear worked great for 8 years but the last year has been difficult. Thanks again for this input.
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Re: Gear Checkvalve

I'm looking for a detent switch, part number A-1032-A. this goes on the pilot side actuator for the main gear. Anyone know where to locate this part, or a cross reference number. Thank you. 1973, 112
 
Re: Gear Checkvalve

That's going to be a tough one to find, Larry. They were hard to find 10 years ago. Best place to look would be a salvage yard.

There were some made an Owner Produced Parts many years ago. I don't know if any are available, or not.
 
Re: Gear Checkvalve

Planecents said:
Aerospace Turbine Rotables is not Kelly. I have visited the shop here in Wichita and the overhaul process is superb.
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Aerospace Turbine Rotables used to be Kelly and anything acquired from them during that period is suspect. They ultimately severed their relationship with Kelly and fixed all the problems.Rebuilds from them now are very good.
 
Re: Gear Checkvalve

Commander91gm said:
Aerospace Turbine Rotables used to be Kelly and anything acquired from them during that period is suspect. They ultimately severed their relationship with Kelly and fixed all the problems.Rebuilds from them now are very good.
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They honored the warranty after the 50 hours, I was at 55. The rebuild was still suspect to go bad that quickly. I did have to pay the labor to install the new replacement. I am hoping for better this time.
 
Re: Gear Checkvalve

Exactly, but not "now Kelly" that was my point. He kinda stated it backwards.

Commander91gm said:
Aerospace Turbine Rotables used to be Kelly and anything acquired from them during that period is suspect. They ultimately severed their relationship with Kelly and fixed all the problems.Rebuilds from them now are very good.
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Re: Gear Checkvalve

L P Munn said:
I'm looking for a detent switch, part number A-1032-A. this goes on the pilot side actuator for the main gear. Anyone know where to locate this part, or a cross reference number. Thank you. 1973, 112
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One of our members made a small number of these years ago (a search in the archives here will get you more info), but you won't find any new replacements anywhere. As was pointed out, your best bet will be to get an entire used actuator from the early sn series and use that part.

If your old valve body cracked at the threads please post a picture as I'd be interested to see if it was the same general location that was an issue for the member I mentioned in the past.
 
Re: Gear Checkvalve

Craig - I think we did flush the system after replacing with the Aerospace PP. We did make sure to use Aerospace and not Kelly - I know this issue came up and we saw the Kelly issues.

Yesterday, after replacing the nose up switch which was already on our list (these early models have such a poor gear switch system - 11 total I think that are all out in the 'wind'), the system worked properly. I will fly again today. This one time issue with gear sagging makes me think that it will reappear. If it does, we will flush the entire system again.

I appreciate the help - gear issues are just not pleasant.
 
Re: Gear Checkvalve

gmores said:
If your old valve body cracked at the threads please post a picture as I'd be interested to see if it was the same general location that was an issue for the member I mentioned in the past.
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I had one crack at the base of the threads years ago.
 
Re: Gear Checkvalve

It can be either a bad seal in one or more actuators, or a bad check valve inside the pump. My guess would be the pump, but you should run through the process of capping off each actuator just to confirm. That is described in the gear troubleshooting guide, written by Mr Bailey with assistance from Sven. (How'd I do, Bill?)[/QUOTE]


You da man Frank. [emoji6]
 
Re: Gear Checkvalve

bradmc said:
I had one crack at the base of the threads years ago.
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It is surprising how little thread there is to hold on the assembly.

BTW, I found a cutaway that Sven made of the pieces he produced. Like everything else he did it was top quality and had additional threads to strengthen the affected area.
 

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Re: Gear Checkvalve

gmores said:
had additional threads to strengthen the affected area.
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Threads couldn't be added because the overall length of the threaded boss needed to be maintained. The change that was made to strengthen it was to reduce the amount of material removed at the seat of the cylinder.

It's hard to see in the cutaway, but the area where the threaded boss meets the bottom of the cylinder is slightly chamfered on the inside. On the originals that area has a much more dramatic chamfer (more in line with what we would call a countersink), which made the wall thinner.
 
Re: Gear Checkvalve

Aircraft flown this morning after spending evening in warm hanger. No issues, no gear transition burps. After night in cold hanger before this, seem to get burps every time.

I think there may be water in hydraulic lines (possible ice) - will replace all fluid. Is there a best way to do this with early model SN without removing powerpack?
 
Re: Gear Checkvalve

Hi Larry,

Aerodyme has FAA-approved replacement pistons A-1031-A (used in the main and nose) and collars A-1218-A (used in the nose cylinder) available for overhauling the early style gear actuators. If your A-1032-A body is OK, or can be cleaned up, we may be able to immediately overhaul the actuator for you. If not, we do have the body design available and could manufacture a new FAA-approved body given 4 -6 weeks.

Call me if you wish to discuss.
Jim

802-264-6400
 
Help! I need a Check Valve, I have a snap Tite 7116-1
 
As is stated two posts above his!



​​​
 
Thanks, I'm in the process trying to contact him.
 
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