TRU Ball Tru Ball ST-4 malfunction??

geoffretired

Supporter
Supporter
I have been asked to sort out a tru ball ST4 It is on a hair trigger to the point of being dangerous.
I have taken it apart and figured out how it works. The parts all seem to be in good enough order to work properly.
I am able to adjust the trigger travel screw. If I screw it in until it goes off without the trigger being touched, that seems fine. If I back out that screw it becomes a hair trigger and backing it out even further, by the smallest amount , means it does not release at all. In fact it seems that the trigger is totally locked at that point as if it has reached the end of its possible travel.
The other thing I notice is that the trigger has very little travel whether it has just been released or is set for drawing back the bowstring. When the release aid was opened, I was able to move the trigger by about 3mm at the thumb peg.Once assembled all that travel is lost!!
The first owner had glued in the sensitivity screw and I am unable to adjust that.But I suspect that just adjusts how light or heavy the trigger feels.
Has anyone ever had one of these and experienced this problem?
Thanks
 

dgmultimedia

Supporter
Supporter
IF the one you have is the same as the SST360 ( most of my Tru-Ball Hand releases work with the same methodology )
then the adjustments
involve adjusting BOTH screws Travel First and then the sensitivity screw
If one has been Glued - depending on what was used, Unglue it - it was a mistake and the user did not read the instructions properly...
( lock tight will soften with heat - cyan might - clean everything up and start again otherwise its a bin bag....

Always loosen Trigger Travel Lock Screws before making adjustments and re-tighten when

G DEMAND OFSUPER HIGH SPEED BOWS, THE NEW HS (HIGH SPEED) OPTION
[COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]IS [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]LIGHT YEARS AHEAD[/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]. [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]DUE TO OUR THIN PINS[/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)], [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]TARGETOBSTRUCTION IS REDUCED[/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]. [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]THESE HUNTING SIGHTS AREAVAILABLE IN [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)].010 [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]AND [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)].019 [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]FIBER SIZES[/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)], [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]WITH [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]5 [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]ORLESS PINS WILL ACHIEVE BOW SPEEDS UP TO [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]450[/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]FPS[/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)].[/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]HUNTING SIGHTS WITH [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]6 [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]OR MORE PINS ACHIEVE BOWSPEEDS UP TO [/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]400[/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)]FPS[/COLOR][COLOR=rgb(100.000000%, 100.000000%, 100.000000%)].[/COLOR]


5) Not for use with thinly braided rope loops or rope material under 2mm dia.


6)Never draw bow while setting sensitivity (SEE SAMPLE A). Always insure release is adjusted to asafe setting before drawing bow!



2) Depress cocking bar to cock trigger mechanism. Turn Travel Screw for thumb triggerCLOCKWISE until release misfires. Turn COUNTER-CLOCKWISE 1⁄4 turn for safe no-travel setting.A travel setting less than 1/4? turn may result in a premature fire.


3) Turn Sensitivity Screw for thumb trigger CLOCKWISE for more (HEAVIER) trigger pressure.Turn Sensitivity Screw COUNTER-CLOCKWISE for less (LIGHTER) trigger pressure. A sensitivitysetting too light may result in a premature fire. DO NOT OVER-TIGHTEN SCREW INCLOCKWISE DIRECTION AS DAMAGE TO SPRING MAY OCCUR.




4) Retighten lock screws and always check to insure lock screws are tight before usingrelease.


5) To adjust 360 degree head rotation, loosen lock screw and rotate head to a position where thereis no twist in the d-loop when at your anchor point. Retighten lock screw.
 

geoffretired

Supporter
Supporter
Hi Thanks for that reply.
As my post was made a few months ago with no reply, I forgot all about it.
Some time after that I did open it up to find the problem was very strange. All the inside moving parts looked fine and so did the body, inside and out. However, one of the links in the mechanism was not able to move as much as it was supposed to. I could not see any reasons for that being the case, but by removing some of the casing that was restricting the link from having any real travel, it then worked and adjusted as it should.
Sorry about not posting about the solution, but I had totally forgotten about the post by the time I got round to sorting it out.

- - - Updated - - -

Hi Thanks for that reply.
As my post was made a few months ago with no reply, I forgot all about it.
Some time after that I did open it up to find the problem was very strange. All the inside moving parts looked fine and so did the body, inside and out. However, one of the links in the mechanism was not able to move as much as it was supposed to. I could not see any reasons for that being the case, but by removing some of the casing that was restricting the link from having any real travel, it then worked and adjusted as it should.
Sorry about not posting about the solution, but I had totally forgotten about the post by the time I got round to sorting it out.
 

dgmultimedia

Supporter
Supporter
It popped up as an unread post - probably because Admin (Dave) seems to be repairing a software problem - I saw it with no answer and jumped in. !


Sent from my iPhone using Tapatalk
 

geoffretired

Supporter
Supporter
Yes, there were no answers , and I forgot about it. But thanks for trying to help. When I finally opened it up, there was no way it could work unless the travel was set to dangerously small. There was no space for the parts to move in the trench that it was supposed to pivot in.

- - - Updated - - -

Yes, there were no answers , and I forgot about it. But thanks for trying to help. When I finally opened it up, there was no way it could work unless the travel was set to dangerously small. There was no space for the parts to move in the trench that it was supposed to pivot in.
 

jerryRTD

Well-known member
you need to get the glue up to 120degrees C. take off anything that will melt and put it in a preheated oven for 15 to 20 min.
 

geoffretired

Supporter
Supporter
Cheers Jerry. I did get the thing to work by removing metal that was restricting some of the travel of one of the levers inside. I still don't know why that was necessary.
 
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