Air Arms AA TX200 MkIII will not cock

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MOSOSODBOB

MOSOSODBOB

Member
Apr 1, 2023
151
119
Tacoma, WA, USA
All,

Experiencing the below problems. This happened while shooting it. Was going fine until a shot that sounded louder than norm. Then the below issue is noted. If anyone with experience in troubleshooting and solving this, please post.

Problem:
- The gun will not cock
- Will release to uncocked position (bear trap latch will hold until I release it)
- Cocking lever will not stay latched

Observations (don’t know if normal or a problem)
- Cocking shoe is loose in its recess on the compression tube (normal?)
- Where the cocking shoe contact the compression tub, it is peened, fore and aft end (normal?)
- Rear guide washer missing (per schematic it show needs to be in between the spring and the rear part of the spring guide) (when I disassembled the gun, did not see that part, don’t know if it is really missing or just not needed or an actual part on this model)

I did the following and checked:
- cleaned off lube and inspected parts for damages or “workie-ness"
- spring is undamaged
- piston seal and the baring guides all appears undamaged (plenty of lube)
- O rings in the breech appears ok
- breech area appears ok
- seems to have good “suction and compression” when I relubed and tested by plugging the hole and pushing on the piston in and out
- cocking arm and the link have no unusual wear and appears undamaged (not bent)
- cocking link fits into the shoe ok but not allowing travel enough towards the muzzle to allow the detent to latch (when assembled)… had to unlatch to line up the hole to reinstall the pin… will not line up if latched.

thanks in advance for your insight

Bob
 
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The rod inside the piston (TX320HH) is too short.
The piston is designed to turn an RCH every time the gun is cocked.
If loctite has not been applied to the piston rod, it will turn independently with no regard to the piston either making it longer, or in your case, shorter.
Try and turn the piston rod CCW just a wee bit and put everything back together and then see if that works.
If not turn it some more.
I have three TX200s. One of them had this problem and it drove me crazy. Finally I made the piston rod of the offending TX the same length as the one I knew worked well.
VOILA!
I was told that the face of the piston rod short be flush with the face of the piston. This was not the case with my TX200 #3.
 
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The extra loud shot has me puzzled. That aside, possible issues could be but not limited to, an improperly adjusted trigger, something broken in the trigger mechanism, broken/worn shoe (it's hard to say without seeing it), a binding spring, and a loose latch rod as Frank in Fairfield mentioned.

If it were me I'd disassemble and try latching the piston to the trigger on the bench (outside the gun) to rule out any mechanical issues with the trigger. While you have it apart check the latch rod to make sure it's not loose. Keep us posted I'm really curious what the problem is. The tx200 is a fantastic rifle, very accurate easy to shoot and simple to work on.
 
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JW652 said:
It is possible that you have failed to complete the cocking stroke, even though it feels as if you did. This is a ommon issue with the tx. just give the lever an extra tug and you should hear the click when it engages times that is not the cause
Click to expand...

Jay308 said:
What do you mean by the cocking shoe is peened?
Click to expand...
when I have it apart, will take a picture post it
 
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853_OKG said:
The extra loud shot has me puzzled. That aside, possible issues could be but not limited to, an improperly adjusted trigger, something broken in the trigger mechanism, broken/worn shoe (it's hard to say without seeing it), a binding spring, and a loose latch rod as Frank in Fairfield mentioned.

If it were me I'd disassemble and try latching the piston to the trigger on the bench (outside the gun) to rule out any mechanical issues with the trigger. While you have it apart check the latch rod to make sure it's not loose. Keep us posted I'm really curious what the problem is. The tx200 is a fantastic rifle, very accurate easy to shoot and simple to work on.
Click to expand...
I was unable to rule out the trigger… don’t know mych about hiw it works… will look into that
 
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Frank in Fairfield said:
The rod inside the piston (TX320HH) is too short.
The piston is designed to turn an RCH every time the gun is cocked.
If loctite has not been applied to the piston rod, it will turn independently with no regard to the piston either making it longer, or in your case, shorter.
Try and turn the piston rod CCW just a wee bit and put everything back together and then see if that works.
If not turn it some more.
I have three TX200s. One of them had this problem and it drove me crazy. Finally I made the piston rod of the offending TX the same length as the one I knew worked well.
VOILA!
I was told that the face of the piston rod short be flush with the face of the piston. This was not the case with my TX200 #3.
Click to expand...
will take if apart and see if any movement… you know the proper length? will measure when apart
 
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Jay308 said:
What do you mean by the cocking shoe is peened?
Click to expand...
shoe is fine.. the slot where it rides on the compression chamber is peened… apparently the compression chamber’s metal is softer than the shoe… will taje a photo and most…

anybody knows how much play (tolerance) should be for the cicking shoes?
 
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The only time my TX200 MKIII failed to cock turned out to be a trigger problem. The factory greases inside the trigger mechanism had thickened and begun to dry. With the onset of cooler weather, and having been set up for a while in the close, coupled with an overly light trigger pull adjustment, caused the mechanism to be unable to cock. A quick trigger adjustment returned function. I then followed up with disassembly and relubrication of the trigger assembly to restore like new operation.

Good luck with yours.

Cheers,
Feinwerk
 
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