GTA
General Discussion To Gateway To Airguns => Gamo Gate => : raterminator January 12, 2007, 12:52:27 PM
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After putting the lube on barrel pivots of my Hunter 400there is almost no tension after cocking, and the barrel is too loose to stay under 90 degrees. I used Break-Free CLP, which I’m using to lube my firearms for long lasting smooth action. Did I do something stupid or is it something else that requires immediate attention?
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Well Garen, sounds like we need some experience person on types of lubes to use in specific places..:) I know nuthin.. hehe
Maybe someone will chime in with some ideas or solutions.
Best of luck
Gene
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...unless you're positive it's safe for all plastic and rubber parts.
I'n not familiar with this stuff, but a quick glance at the manufacturer's page inducates that this is a pretty strong solvent. Airguns typically use plastic parts in various locations that a firearm would not, and these parts can get destroyed by the wrong chemicals. These parts are not used because the airgun makers are "cheap" (well, sometimes, anyway) but because an airgun is a different kind of machine and therefore needs different materials.
There are 2 plastic washers on either side of the pivoting breach block that provide the normally snug fit of the pivot. It's entirely possible that one or both of these were at least partially dissolved by the stuff you used.
They are not difficult to replace, but unfortunately, Gamo doesn't normally sell these. They might if you ask them nice (but don't count on it!). You will probably need an impact driver (the kind you hit with a hammer) to remove the pivot bolt, though. I've tried wrenches on big screwdrivers and only succeeded in mangling the bolt head. The impact driver yanks 'em right out.
Rich might be able to help you out (peterdragin@comcast.net). Or maybe Bob (CharlieDaTuna@Charter.net) Also, I believe that the same parts from a Crosman Quest (part # C1K77-020, you'll need 2) will work. Crosman's number is 1-800-724-7486.
Meanwhile, check your breach seal. If it's damaged, replace it too (easy to do). This is a Gamo-only part (the Crosman part won't fit it) - but Gamo does sell them.
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Vince,
Thank you for a very valuable info. I didn’t know that there were plastic washers. I know, I can possibly destroy the seal or any rubber part with solvent, so I just put 2 drops of it only on the pivot. Seal is in good condition, but I can say nothing about washers without taking gun apart. I wish you’re wrong on this one, but most probably you’re not. I’ll take gun apart and let you know the outcome.
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Well, even if I am - it'll cost you $6 and about a week's wait for the parts, and about 30 minutes of work.
Many of us have done a LOT more damage than that to our guns at one time or another....
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Ther washers for the side movment are of only two types that I have seen, one is a pair of Fiber washers and the other is a pair on steel spring washers. Never seen a plastic side washer in a gamo.
I think if you clean off the oil or what ever you put on the detend plunger your problem will be cured. I just take my finger with a smallest amount of moly and only put a touch on the top of the pin in the rifle and a touch on the bottom of the pin in the barrel.
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I guess I stand corrected - I pulled one of my Gamo's apart, pulled the washers out (they sure look like plastic), and tried touching a hot wire to the edge of one. It didn't melt!
In any case, if one got screwed up the Quest parts to seem do fit, although they're a bit thinner.
Rich - I don't think the detent is his problem. I think his problem is that after the gun is cocked and before the breach is closed, with the barrel just hanging down, it swings freely back and forth without any discernable fricton.
I'm sorry, I forgot to ask - does there seem to be any sideways play in the barrel? Can you wiggle it left and right with the breach closed or almost closed?
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OK, I took it apart. Washers are indeed made of plastic (kind of Teflon). They are in good condition. I just cleaned them from lube and put them back. Now the barrel stays put at any angle. Do I need to put molly on plastic washers, or it will be same as before?
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The friction you notice is only a sign that the pivot screw is tight enough to prevent side-to-side wiggle. Perhaps the lube you put in was slippery enough to substantially negate that friction without damaging anything.
They don't actually HAVE to provide any friction per se. It's not really gonna help keep the breach closed, but it's an easy way to tell if the pivot is too loose. It is generally recommended that the washers do get lubed. So smearing some moly on them isn't a bad idea.
Sorry about the false alarm there - but it still wasn't a bad idea to check them.
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No harm, better safe then sorry.
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If I have the barrel off a Gamo I also put about 1/16 spacer in the spring, makes the lockup a lot firmer.