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Old 06-13-2011, 11:05 AM   #1 (permalink)
Wait, what?
 
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Hey folks,

Something I've noticed on the LB and PGP I rebuilt is that the pump stroke is largely determined by the tension applied from the bolt's set-screw. With it not touching the arm, the stroke is buttery smooth (but the arm can fall out); with tension applied, the stroke has a lot more resistance. Any trick for attaining that magical middle ground?

Thanks,
Matt
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Old 06-13-2011, 11:33 AM   #2 (permalink)
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You could make a bolt that allows the pump amr to have some play, but not fall out.

I have a design idea, but I don't think its worth the trouble to make
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Old 06-14-2011, 09:21 AM   #3 (permalink)
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your pump arm falls out if the screw isn't in? really? I've had those screws stripped off inside so they're totally not functioning and not had a problem. are you sure your pump arm isn't bent? There should be enough of the arm after the L that would keep it in the bolt.

Also....I've never really noticed that have the screw in or out changes anything. I'll have to pay more attention to that in the future.
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Old 06-14-2011, 10:57 AM   #4 (permalink)
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I've actually forgot to screw in that set screw before and there is not way the arm can come out on it's own. It takes a good amount of effort for me to get it out for maintenance. I 2nd that maybe you arm is bent which might explain why your pump stroke is a bit rough if it's try to pull/push the bolt at an angle.
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Old 06-14-2011, 11:03 AM   #5 (permalink)
Wait, what?
 
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Yeah, the arm's definitely bent. Well, I have a new one coming from Flory (slightly longer) so that should amend the problem.

And LB - I had Palmers tune a PGP, which I swapped pumps on after it came back. I couldn't figure out why my stroke sucked so much until I loosened the set-screw and it got back to liquid-smooth - and that was with a black Cooper T bolt that uses a centered set screw.
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