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Author Topic: Strange cocking and spring behavior now...  (Read 1548 times)

Offline r1derbike

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Strange cocking and spring behavior now...
« on: June 17, 2007, 01:45:04 PM »
Fired several hundred shots through my .177 CFX now, and it is very accurate, and powerful (compared to previous airguns I've owned).

However, the cocking action sounds like metal-to-metal scraping now, similar to fingernails on a chalkboard, with a metallic tone, and the spring has gotten more twangy and buzzy with use, instead of less.

What am I doing wrong here? It didn't start this weird behavior 'til about 75 shots back, and it started both problems at once.

Broken spring? Any ideas?

Charles
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Lead Launchers: 30 Year Old Daisy .177 Cal. Model 880 Pumper (BSA 3022SB Red Dot Scope), Gamo CFX .22 Cal. Springer with GRT III Trigger (BSA 4X32 Scope), Gamo CFX .177 Cal. Combo Springer (BSA 2-7X32 AO Scope), Gamo R-77 .177 Cal. CO2 Combat Pistol (Laser Sight), Umarex/Beretta .177 Cal. CX4 Storm CO2 Bullpup (Walther PS-22 Red Dot Scope & Dorcy Night Light), Chinese QB-57 .22 Cal. Takedown Springer (BSA 3022SB Red Dot Scope & Dorcy Night Light),  Chinese Tech-Force S2-1 .177 Cal. Springer Pistol (Boat Anchor...), Chinese Tech-Force Contender Model 89 .22 Cal. Springer (BSA Laser & Tactical Light, CenterPoint 4-16X40 Illum. Ret. Mil. Dot Scope), Crosman 1377 .177 Cal. Pumper Pistol (1399 stock, BSA 3022SB Red Dot Scope), Daisy Powerline 717 .177 Cal. Single-Pump Pistol (Open Sights).

Offline vinceb

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RE: Strange cocking and spring behavior now...
« Reply #1 on: June 17, 2007, 01:52:09 PM »
Any change in accuracy, POI, cocking effort or power?
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Offline r1derbike

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RE: Strange cocking and spring behavior now...
« Reply #2 on: June 17, 2007, 02:11:24 PM »
Quote
vinceb - 6/17/2007  6:52 PM

Any change in accuracy, POI, cocking effort or power?


None! That's why I'm stumped!

Groups very tight as always! Same penetration into my backstop (I don't have a chrony) as before!

I'm going to experiment with different cocking methods, and see if the scraping changes, when cocking, right now.

That still doesn't explain the buzzy/noisy spring now.

Will report back...

Charles
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Lead Launchers: 30 Year Old Daisy .177 Cal. Model 880 Pumper (BSA 3022SB Red Dot Scope), Gamo CFX .22 Cal. Springer with GRT III Trigger (BSA 4X32 Scope), Gamo CFX .177 Cal. Combo Springer (BSA 2-7X32 AO Scope), Gamo R-77 .177 Cal. CO2 Combat Pistol (Laser Sight), Umarex/Beretta .177 Cal. CX4 Storm CO2 Bullpup (Walther PS-22 Red Dot Scope & Dorcy Night Light), Chinese QB-57 .22 Cal. Takedown Springer (BSA 3022SB Red Dot Scope & Dorcy Night Light),  Chinese Tech-Force S2-1 .177 Cal. Springer Pistol (Boat Anchor...), Chinese Tech-Force Contender Model 89 .22 Cal. Springer (BSA Laser & Tactical Light, CenterPoint 4-16X40 Illum. Ret. Mil. Dot Scope), Crosman 1377 .177 Cal. Pumper Pistol (1399 stock, BSA 3022SB Red Dot Scope), Daisy Powerline 717 .177 Cal. Single-Pump Pistol (Open Sights).

Offline Splash

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RE: Strange cocking and spring behavior now...
« Reply #3 on: June 17, 2007, 02:20:58 PM »
The grinding when cocking could be a wear shoe that popped off. Take the action out of the stock and check the shoe. The spring twang is normal, for most Gamo's, out of the box. It could have had a light coat of oil on the spring to start and now it has slung off.HTH
Mike
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Offline Rixtrix

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Re: Strange cocking and spring behavior now...
« Reply #4 on: June 17, 2007, 02:53:20 PM »
Look at the spring when you have the action out of the stock, too( if you can on a CFX). These are exactly the same symptoms when the spring broke in my S1K.Took about 100 more shots until the spring had wrapped itself within itself to notice a drop in power.

Ric G
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Daisy Model 25 BB gun, 45 years young and still shooting-    BSA Ultra .177, RFM Muzzlebrake, Bushnell Elite 4200 6x24-40 AO Mildot scope,  SportsMatch high rings)-    Gamo Shadow 1000, GRT-lll trigger, AirGunToyz Muzzle Brake, Centerpoint 4-16x40 AO IR mildot,Accushot Med. One Piece Mount, JM Tarantula spring and seal, polished internals, sleeved guide and tophat,self-tuned with CDT advice, CPL, JSB Exact or Predator pellets

Offline r1derbike

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Re: Strange cocking and spring behavior now...
« Reply #5 on: June 17, 2007, 03:52:01 PM »
I'm torn between sending it in, or using it a bit more, at least until my .22 CFX arrives.  I don't want to disassemble it, it is still under warranty.  I just noticed the slot-head screw going into the top of the muzzle brake has its slot boogered/stripped, and the cocking rod does not line-up perfectly  with its receptacle, the rod is angled to the left, but a push will seat it.

The rear of the scope rails were boogered somewhat, possibly from a scope brake block there? Do they jig it there (factory)  for final alignment?

The more I scrutinize the rifle, the more questions I have about its age (manufactured in '04) before it landed on my doorstep...

Charles
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Lead Launchers: 30 Year Old Daisy .177 Cal. Model 880 Pumper (BSA 3022SB Red Dot Scope), Gamo CFX .22 Cal. Springer with GRT III Trigger (BSA 4X32 Scope), Gamo CFX .177 Cal. Combo Springer (BSA 2-7X32 AO Scope), Gamo R-77 .177 Cal. CO2 Combat Pistol (Laser Sight), Umarex/Beretta .177 Cal. CX4 Storm CO2 Bullpup (Walther PS-22 Red Dot Scope & Dorcy Night Light), Chinese QB-57 .22 Cal. Takedown Springer (BSA 3022SB Red Dot Scope & Dorcy Night Light),  Chinese Tech-Force S2-1 .177 Cal. Springer Pistol (Boat Anchor...), Chinese Tech-Force Contender Model 89 .22 Cal. Springer (BSA Laser & Tactical Light, CenterPoint 4-16X40 Illum. Ret. Mil. Dot Scope), Crosman 1377 .177 Cal. Pumper Pistol (1399 stock, BSA 3022SB Red Dot Scope), Daisy Powerline 717 .177 Cal. Single-Pump Pistol (Open Sights).

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RE: Strange cocking and spring behavior now...
« Reply #6 on: June 17, 2007, 11:01:44 PM »
If it's under warranty, send it back. Otherwise strip it, clean and de-burr it, change spring if broken, replace cocking shoe slide if lost, lube & re-assemble. It's all straightforward with a bit of common sense. A CFX should be quiet and smooth when cocking.
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