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Retract maintenence/ tamjets A4 - 11/11/2012 3:42 PM   
jzuniga


 

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From: Gig Harbor, WA, USA
Status: offline 		I have a TamJets A4 and the nose retract does not want to retract fully up into the wheel well? The mains go up no problem and they all extend no problem. There are no kinks in the air lines, and I was wondering if there is issues with the piston rod being sticky? and or if they need to be lubed at all?
If I give the nose retracts a little push they go up, so something seems sticky, or like it's binding?

Thanks

Z

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RE: Retract maintenence/ tamjets A4 - 11/11/2012 4:03 PM   
BaldEagel



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Status: offline 		Just a thought have you checked that your steering cables are not too tight.

Mike

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RE: Retract maintenence/ tamjets A4 - 11/11/2012 6:26 PM   
Eddie P



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From: Reno, NV, USA
Status: offline 		I use 110 psi for my pneumatic gear of this size and for my TJ A-4 I cycle the gear a couple times the day before flying to make sure everything is nice and ready and then a few times, right before the first flight, to make sure all is good. The fist few cycles - they cycle up and down a little more reluctantly (they always seem to go down but going up against gravity is where the cycles improve performance). Usually four cycles and they are perfect, and remain so for the rest of the day. Trouble with air gear occurs in cooler conditions of fall and winter and cycling and lubing improves performance.


quote:

ORIGINAL: jzuniga

I have a TamJets A4 and the nose retract does not want to retract fully up into the wheel well? The mains go up no problem and they all extend no problem. There are no kinks in the air lines, and I was wondering if there is issues with the piston rod being sticky? and or if they need to be lubed at all?
If I give the nose retracts a little push they go up, so something seems sticky, or like it's binding?

Thanks

Z


You are on to it. But just to ramble, here was my situation several years ago.

I use an in line air gauge to back up the pump gauge. On my initial experience with my A-4 I was presented with a baffling problem. At 100 psi on my pump gauge I was not able to get the nose gear to cycle firmly up and locked, no matter when I tried. I took the gear out and injected it with BVM gear cylinder lube. I made sure the gear operated freely, no binding, no nothing, on a hand Robart pump. It was weird - the gear was cycling outside of the jet with 40 psi just fine but why wasn't it cycling in the jet at 100? I thought it might be an unseen hang up in the steering linkage or lines or a kinked base plate introducing a twist or drag in the swing - or whatever. After re installing and being completely anal, still problems on the pump showing 100 psi in the lines. I thought maybe there was some sort of restriction in the air system plumbing. Before pulling all my lines I tried one other thing - I installed an in line air pressure gauge to see what was happening in the cycles. Put the gauge in, hooked everything up... Wouldn't you know it - the pressure gauge on the electric pump I was using failed and was showing 100 psi when I was actually only putting in 55-60 according to the "in line gauge". So one psi gauge was lying - but since the next step was replacing all the air lines anyway I said to heck with it and pumped up to 100 pis on the inline gauge. Now the gear worked!!!! Got a new pump and the new pump agreed with the inline gauge. The old pump served me for years on my previous turbine jets and failed after my first few fill ups on the A-4. The first few worked, then the problems started. That was the hardest part to get over in my diagnosis, as it worked initially. Weird!

For you, Z, failing any bad air psi gauge or linkage or hang ups or lines getting in the way of a free upswing... consider taking your gear our and lubing the up swing and down swing action of the cylinder with BVM lube. You may just have sticky internals. Failing that, maybe an electric "up and locked" upgrade!!! I know a lot of guys who have gone that route and have been really happy!! But I think you'll find an easy solution with lube and double checking psi and free swinging gear with all those lines and steering linkage in there. It's worked for me and my gear has lots of cycles on it and holds air great still and works great.

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RE: Retract maintenence/ tamjets A4 - 11/11/2012 7:16 PM   
Eddie P



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Status: offline 		Oh yeah, what gave me pause to wonder was the whole time the mains were snapping up and down with zero issues even with the artificially low psi I was using initially when the pump gauge went wrong. If you are gonna see anything, it will happen in the nose gear upswing first.

Good luck with everything, sure you'll be on top of it quickly.

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RE: Retract maintenence/ tamjets A4 - 11/11/2012 8:58 PM   
Ron101



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Status: offline 		I had that issue once with my TJ A-4
my nose gear didn't want to go up all the way after many perfect flights....
turned out the adjustable link on the back of the gear and worked it's way down.... I adjusted it out and bam.. it was fixed
So I put some lock tight on it after that and never had that issue again

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RE: Retract maintenence/ tamjets A4 - 11/12/2012 12:03 AM   
jzuniga


 

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Status: offline 		Thanks guys I'll look into it and report later...

Z

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RE: Retract maintenence/ tamjets A4 - 11/12/2012 3:21 AM   
jzuniga


 

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Status: offline 		BTW, Eddie, did you mean that stuff that BVM sells that you just squirt in the nipple straight into the cylinder?

Z

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RE: Retract maintenence/ tamjets A4 - 11/12/2012 5:40 AM   
CARS II


 

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Status: offline 		Z
That happens to be the oil that rc cars use on their shock absorbers, 30 weigth should do it and yes, that staff will get the internal O rings lubricated for a long time and it will reduce the drag inside the air cylinder giving you an easer retraction or more cycles per air tank.

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RE: Retract maintenence/ tamjets A4 - 11/12/2012 5:54 AM   
jzuniga


 

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Status: offline 		Thanks Cars... I think I have some of that laying around... I'll try it;-)

Z

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RE: Retract maintenence/ tamjets A4 - 11/12/2012 3:02 PM   
Eddie P



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Status: offline 		Yes Jamie, that's the stuff (very thin and clear lube) Good to know Carlos, I'm sure it's easier to get and cheaper. Having said that I'm still only 1/4 the way through the little BVM bottle I bought many years ago and I use it sparingly but every so often with pneumatic gear.

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RE: Retract maintenence/ tamjets A4 - 11/12/2012 3:49 PM   
jzuniga


 

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quote:

ORIGINAL: Eddie P

Yes Jamie, that's the stuff (very thin and clear lube) Good to know Carlos, I'm sure it's easier to get and cheaper. Having said that I'm still only 1/4 the way through the little BVM bottle I bought many years ago and I use it sparingly but every so often with pneumatic gear.


I hear ys... it's not really the $$$, but the fact that I can find the rc car shock oil at any local hobby shop and don't have to wait a week and pay for shipping ;-)

Z

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