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Question about pressure relief valve on FT500 Hale on Deuce and a Half fire truck

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  • #31
    Thank you for getting back to me. I will try to respond per event.,..
    Originally posted by KuhShise View Post
    Scooter: Take a dial indicator and try to measure the depth of the packing gland to the shoulder where you are contemplating placing the bushing. Is it possible that there is supposed to be two pieces of packing before you insert the lantern ring? I know there is little chance that Hale will have the dimensional drawing for this pump, but I can't believe that their original machinist cut this bore too deep when it was made. As you see this is a critical dimension and was probably checked with a go - nogo plug type gauge when it was made. The other thing that might have changed over the years is the width of the packing material, but with only one ring ahead of the lantern ring, it is not so likely.

    As is, with the factory replacement packing kit, if I use the 7/16 packing as from Hale - the volute hole is basically where I showed you in the pic. lantern ring falls either right on top of the hole or right behind it... forcing all volute water into the packing. The dimensional diagram provided by Hale shows one piece of packing, one lantern ring, then 2nd lantern ring one piece of packing, one sacrificial shim, one piece of packing, one sacrificial shim, one piece of packing, packing gland

    Take a mike or dial indicator and measure the width of the half lantern ring. Then check the distance from the extreme bottom of the packing gland to the center of the hole for the water coming to the lantern ring. Subtract the width of the half lantern ring, and compare this difference with the width of the packing you are putting in the bottom. You will get some compression in the width as the packing deforms and is squeezed down upon the shaft. Allow .015 to .035 per ring for compression when the packing is properly adjusted. Awww, You get the idea...Just make sure the lantern ring is in the right place.

    Done it... takes a spacer that is almost 1/4 inch thich-that sits the volute at the very edge of the volute hole w/o compression... with compression, the volute should be right in the center of the lantern rings.

    PS: I would like permission to use the photograph in my pump classes and presentations, if possible.
    Have at it Kuh. I know we are using it for training at our facility. If it saves just one more disassembly... I have many more where that came for. I can send you a sequence of the disassembly where eventually it will show the problem. Let me know if you want it sent direct and if so, where to. You are free to use as you please. Just try to embarrass me as little as possible
    Thank you-You know, I was wondering if a packing is installed, set and adjusted, then something happens that requires disassembly can I reuse the packing (even if it has no hours of use-but was tightened to drip specs? Or is it like a plumbing npt fitting... you tighten to position, if you go past where you want it, you really cannot back to the plqce where the angle is right, you have to go through another 360 degrees until it is right where you want it. I tell you the more I learn, the more I need to learn!!!)

    One thing I do know for sure, all of these jobs would be much more difficult if we did not have access to the wealth of info here Thanks again
    Last edited by scootertrs; 12-03-2010, 02:29 AM.

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