Jet 1A nose gear slow
11-05-2010, 02:29 PM
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Jet 1A nose gear slow
Hi guys:
The nose gear on my Jet 1A retracts is slow to lock down on releasing the air. It does not always come all the way down and lock. This results in a gear folding on landing.
The main gear does fine. They snap open and closed with no problem. Plenty of air pressure. The mains work down to 40 pounds just fine. The nose gear is sluggish.
My question is, should I use a small amount of lube in the nose gear.
I have 3 in 1 , air tool oil and small aluminum engine storage oil that I use for glow fuel engine after run oil. I also have auto air conditioner oil.
The spring seems like it could use some lube but, I don't want to foul up the system.
Thanks
Bob K
The nose gear on my Jet 1A retracts is slow to lock down on releasing the air. It does not always come all the way down and lock. This results in a gear folding on landing.
The main gear does fine. They snap open and closed with no problem. Plenty of air pressure. The mains work down to 40 pounds just fine. The nose gear is sluggish.
My question is, should I use a small amount of lube in the nose gear.
I have 3 in 1 , air tool oil and small aluminum engine storage oil that I use for glow fuel engine after run oil. I also have auto air conditioner oil.
The spring seems like it could use some lube but, I don't want to foul up the system.
Thanks
Bob K
11-05-2010, 03:02 PM
#2
RE: Jet 1A nose gear slow
Bob
Before you lube anything try loosening the mounting screws to ensure the unit is not twisted on the mounting lugs.
Also how is the nose plumbed in, where does the tube link in with the mains?
Have you tried putting the leg up, discontect the air line and release the leg, does it slam down now?
Dave Wilshere
Before you lube anything try loosening the mounting screws to ensure the unit is not twisted on the mounting lugs.
Also how is the nose plumbed in, where does the tube link in with the mains?
Have you tried putting the leg up, discontect the air line and release the leg, does it slam down now?
Dave Wilshere
11-05-2010, 03:08 PM
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RE: Jet 1A nose gear slow
It sounds like a lack of lubrication...Adding a small amount of BVM "Thin Lube" will lubricate the O-ring and cylinder bore, improving the seal.
Inject one or two CC's directly into the cylinder through the air nipple , then cycle it several times.
Inject one or two CC's directly into the cylinder through the air nipple , then cycle it several times.
11-05-2010, 07:08 PM
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RE: Jet 1A nose gear slow
Hi Dave:
Thanks for the quick reply.
I tried loosening the mount and that made no differencest was a good idea, I'm into simple solutions.
Next I opened a 3 way feisto fitting after the solenoid and that did the trick. The gear banged down quite rapidly and locked securely.
The mains work off this same feisto and were satisfactory but now they all work the same.
somewhere there is a slight hold up when the solenoid releases air. I just need to discover where.
Thanks
Bob K
Thanks for the quick reply.
I tried loosening the mount and that made no differencest was a good idea, I'm into simple solutions.
Next I opened a 3 way feisto fitting after the solenoid and that did the trick. The gear banged down quite rapidly and locked securely.
The mains work off this same feisto and were satisfactory but now they all work the same.
somewhere there is a slight hold up when the solenoid releases air. I just need to discover where.
Thanks
Bob K
11-05-2010, 07:12 PM
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RE: Jet 1A nose gear slow
Hi Harley:
Thanks for the quick reply.
Dave's idea seems to have worked but I am interested in the lubeing idea.
Which oil do you suppose is closest to the BVM stuff. I know he just repackages and I have a lot of the other oils on hand.
Bob K
Thanks for the quick reply.
Dave's idea seems to have worked but I am interested in the lubeing idea.
Which oil do you suppose is closest to the BVM stuff. I know he just repackages and I have a lot of the other oils on hand.
Bob K
11-05-2010, 07:43 PM
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RE: Jet 1A nose gear slow
Any silicone based lube will work. Just go to your local hardware store or Home Depot and get a spray can of silicone lube. I slip a short piece of airline over the tube that you stick into the nozzle and inject it directly into the cylinder. Do not use any type of petroleum based lubricant, it will deteriorate the seals.
Joe
Joe
11-06-2010, 10:14 AM
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RE: Jet 1A nose gear slow
Hi Joe:
Thanks, I do have a can of that stuff.
I tried it on the shaft that comes out the back of the unit and it seems to move easier now.
The proof will be in the airhopefully tomorrow.
Bob K
Thanks, I do have a can of that stuff.
I tried it on the shaft that comes out the back of the unit and it seems to move easier now.
The proof will be in the airhopefully tomorrow.
Bob K
11-06-2010, 12:18 PM
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RE: Jet 1A nose gear slow
Hi Dave:
I'm using a Jet Tronics 'M' valve to a 3mm feisto 'T'. One inlet from the Jet tronics, one outlet to the nose gear and one outlet to the mains.
After I released the pressure at the 'T' several times it seemed to get better. After I used a small amount of silicone spray on the rod coming out the back of the retract unit it seemed better still.
It's banging down now with the same authority as the mains.
I hope to fly tomorrow (Sunday here in NJ). That will be the ultimate test.
If it's still not locking down I will replace the 3 way feisto.
My installation is not the neatest so the connector is hard to get to.
Thanks again for your expertise.
Bob K
I'm using a Jet Tronics 'M' valve to a 3mm feisto 'T'. One inlet from the Jet tronics, one outlet to the nose gear and one outlet to the mains.
After I released the pressure at the 'T' several times it seemed to get better. After I used a small amount of silicone spray on the rod coming out the back of the retract unit it seemed better still.
It's banging down now with the same authority as the mains.
I hope to fly tomorrow (Sunday here in NJ). That will be the ultimate test.
If it's still not locking down I will replace the 3 way feisto.
My installation is not the neatest so the connector is hard to get to.
Thanks again for your expertise.
Bob K
11-06-2010, 12:53 PM
#10
RE: Jet 1A nose gear slow
Bob
So the T connection comes straight off the outlet from the M valve? Then one going to the nose and the other going to another T, which feeds both mains?
Dave
So the T connection comes straight off the outlet from the M valve? Then one going to the nose and the other going to another T, which feeds both mains?
Dave
11-06-2010, 02:48 PM
#12
RE: Jet 1A nose gear slow
Depending where the valve is I have taken the outlet air in a single tube back towards the wing so that the length of tube between the mains and nose is roughly the same, then T'd there. The air has got to get out of the cylinder when you hit down, I have seen it where the double cylinder air (on SA systems) coming back from the mains towards the valve/nose cylinder slows down the nose extension speed and stops it locking...
Dave
Dave
