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Arrow Jumps during cocking

 
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  #8  
Old 09-19-2011, 10:31 PM
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Join Date: Dec 2010
Posts: 391
Re: Arrow Jumps during cocking

Hi WildWillie,
The information that i supplied was wrong for your particular problem, but it was correct for the problem that I described.

Your cause was coming from a different source, but myself and others have encountered the problem of the arrow nocks clipping the edge of the Weaver Rail as the cable sled reaches almost the full draw position. This does not ever occur on the TAC15's, but it does take place on the TAC15i's.

Glad somebody else on the forum had experience with this problem.

Jon
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  #9  
Old 10-12-2011, 04:21 PM
Field Editor
 
Join Date: Dec 2009
Posts: 350
Re: Arrow Jumps during cocking

On the last page of PSE's Tac 15 instruction manual is a section called "Trouble Shooting". The second item there might be what you need.

Here's what it says:

Issue:

When cranking, a clunk is heard and the arrow may pop off the string.

Solution:

The draw cord is not spooling up properly. The draw cord is initiating its spooling in the wrong direction. Looking at it from the back it should spool to the left first. Remove the lower and unspool the release all the way. Start cranking it back and use your finger to start the spooling in the proper direction. NOTE: When pulling the release forward, only pull it far enough forward to attach it to the loop. This will prevent the first wrap around the spool from winding in the wrong direction.
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Andy Backus
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  #10  
Old 10-13-2011, 02:53 PM
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Join Date: Dec 2010
Posts: 391
Re: Arrow Jumps during cocking

Hi All,
To add to the instructions that Andy has provided also do the following:

If you do pull excess cord out to attach your D-Loop to the winding sled release or forget about the sled long enough to use your right hand to apply tension and guide the excess winding cord back onto your cranking spool while you begin cranking with your opposite hand. Always start the spooling from the left side of your spool and guide it toward the right as instructed by PSE.

Whoever it was that stated their Cable Bumpers are split 1/2" deep, they need to replace these immediately to avoid problems. There are at least two different bumpers sold by PSE. One is the original bumper that is used in the manufacturing process and there is also another that looks almost identical to that one, but it's sold as a Vibration Dampener for their compound bows, by PSE and can be found on their website under the vibration dampening accessories.

Both will fit your crossbow the same way, but the second one I mentioned is a softer rubber than the first. It does a better job with the vibration dampening, but I have no statistics on how long it will hold up yet because I only have about 100 shots on one. The price for the the non factory cable stop is very inexpensive. I have no idea what PSE charges for the original factory dampeners.

Super 91 also has purchased and used some after market cable dampeners that are supposed to be very god, but I don't have any details on the ones that he's now using. Possible he can fill in the details when he see's this thread.

Jon
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  #11  
Old 10-24-2011, 06:00 AM
Bronze Member
 
Join Date: Jan 2011
Posts: 55
Re: Arrow Jumps during cocking

Just wanted to give another update on the "string jump". The string jump is 99% of the time caused by the string not spooling up evenly on the spool. After about 100 shots with perfect cocking, mine started "jumping" again. This is twice it has happened since I received a new upper about 2 months ago. Both times I found that the pin that secures the gear on the winding shaft has shifted so it is sticking out on one side or the other. There is a set screw that holds that pin in place and the set screw was loose. Once I slid the pin back so it is centered and tightened the set screw the "jumping" goes away. It seems that the pin sticking out was catching the string and at some point the string would finally slip past causing the string to jump. Next time I'm using a little loc-tite on the set screw.

WildWillie
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  #12  
Old 10-25-2011, 12:36 AM
Silver Member
 
Join Date: Dec 2010
Posts: 391
Re: Arrow Jumps during cocking

Hi WildWillie,
For the record there's two types of Loctite available. One is "Loctite Blue" which makes it difficult to back out a screw after it's been applied, but with some force you can still remove it without too much trouble.

The second type, which is "Loctite Red", secures a screw and makes it impossible to ever get the screw out unless you heat the threads with a torch before trying to turn it.

I think you are probably referring to Loctite Blue for this application.

BTW - Great find. This should help a lot of people since we've been hearing about this problem for quite a while now.

Regards,

Jon
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  #13  
Old 10-27-2011, 06:22 AM
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Join Date: Feb 2011
Location: SW virginia
Posts: 82
Re: Arrow Jumps during cocking

Quote:
Originally Posted by WildWillie View Post
Just wanted to give another update on the "string jump". The string jump is 99% of the time caused by the string not spooling up evenly on the spool. After about 100 shots with perfect cocking, mine started "jumping" again. This is twice it has happened since I received a new upper about 2 months ago. Both times I found that the pin that secures the gear on the winding shaft has shifted so it is sticking out on one side or the other. There is a set screw that holds that pin in place and the set screw was loose. Once I slid the pin back so it is centered and tightened the set screw the "jumping" goes away. It seems that the pin sticking out was catching the string and at some point the string would finally slip past causing the string to jump. Next time I'm using a little loc-tite on the set screw.

WildWillie
Any chance you could take a picture of the pin and so forth?
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