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

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  • #16
    gauges can lie -your hand on the steamer is best - not only for temp - but any vibration that is not normal. There is no reason for a properly attented to pump to overheat from "churning"
    ?

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    • #17
      Thanks for the reply. I hope to someday be able to det. temp of the packing with my hand, but I almost cooked our packing since the volute aperture was clogged and the packing got very hot. KuhShise gave me the heads up, and sure enough, it was not flowing. I can shoot the packing with an ir thermometer... what is an acceptable temp. range? is it the ... one mississippi, 2 mississipi, hand on pump in the area of the packing or ?. I already know that boiling spit is too hot...
      Thanks all



      Originally posted by slackjawedyokel View Post
      gauges can lie -your hand on the steamer is best - not only for temp - but any vibration that is not normal. There is no reason for a properly attented to pump to overheat from "churning"

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      • #18
        I am far from a pump expert - but first lets make sure we are comparing apples to apples - it sounds like you had an issue with the clearance (adjustment) of the packing - that is a mechanical problem not operator error. That needs corrected - to answer the other question -depends - if you are slipping booster tank water in July it will feel warmer than if you are drafting out of lake Michigan in January, the reason "churned" water heats up so fast is the theory of a pressur cooker. My rule of thumb - you notice an increase in temp on the steamer (or pump housing itself) - slip a little more water. And at least the old type packing usually melted and let some water flow before it did MAJOR damage. Kushe -- correct me if I am steering him wrong
        ?

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        • #19
          You are right about the mechanical issue, but had a plugged volute opening and could not get lubricating and cooling water to the packing. If I loosened the packing I would get leaking past it when truck was fed with pressure (hydrant or garden hose) to 50 psi. Filled tank, fired truck up primed and running from the tank, at over 150 psi pressure I had, never had a drop come from the packing. After reading all posts here I did research (physical... on the truck... UUUFFFF) removing the gearbox, packing, rear cover of pump, etc. to find a blockage in the volute opening.

          On another topic... Why can't they make things planning for service... they (manufacturers) all know it is going to break eventually... If I was 18 and 160 pounds, then I could contort myself into those nook and crannies as necessary... But alas that is not to be ... in this life time ... anyway. And our ex-military truck is nowhere near as bad as most of the newer vintage ones. Just venting... I will ache all weekend!!!

          Originally posted by slackjawedyokel View Post
          I am far from a pump expert - but first lets make sure we are comparing apples to apples - it sounds like you had an issue with the clearance (adjustment) of the packing - that is a mechanical problem not operator error. That needs corrected - to answer the other question -depends - if you are slipping booster tank water in July it will feel warmer than if you are drafting out of lake Michigan in January, the reason "churned" water heats up so fast is the theory of a pressur cooker. My rule of thumb - you notice an increase in temp on the steamer (or pump housing itself) - slip a little more water. And at least the old type packing usually melted and let some water flow before it did MAJOR damage. Kushe -- correct me if I am steering him wrong

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          • #20
            Makes you wonder why front mounts werent more popular.
            ?

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            • #21
              Originally posted by slackjawedyokel View Post
              Makes you wonder why front mounts werent more popular.
              Not really... those a normal person with mediocre capabilities could fix... life would be ... well... indefinite... as long as parts were available... Thus, how many new sales would there be? I am sure I have exhausted several lifetimes of our deuce and a half. When you speak to some equipment manufacturers seeking info about trucks that are over 10-15 years old, they want to know if this truck is in a club or a museum, and are quite surprised to learn that it still is working as a fire truck. Regarding the front mounts, I worked on a k3500 chev truck with a front mount a while back... a spectacular performer and could be fixed in the field if necessary... a must for an open woods fire truck... I just have a problem with design engineers that have never turned a wrench and then go and build a wonderful piece of machinery from the inside out. Repairing one of the early assembly components many times requires dissassembling half of the machine to get to it... that is not new BTW... I putt a 1947 Indian Chief and even back then Indian made it tough to get some stuff done... for example... the detent ball on my shifter needed tightening... I can see it no problem... but to get the wrench in, I would have to remove the chain guard... no problem... but to remove the chain guard, I had to remove the exhaust pipes, ... no problem... but to remove the exhaust pipes, I had to remove the kick starter and the floorboards... no problem... and so on and so forth... pretty soon I had half of the motorcycle on the ground to make a 30 second adjustment... but I digress... replacing the packing was a BIT%$... and I may have been responsible for clogging the volute aperture to start with!!! I left one of the packing washers in the pump by mistake... to replace the packing requires removal of the gear box and 10 inch long very thin fingers with telepathic abilities if it is to be attempted while mounted in the truck... and the best part is... this is one of the easiest ones I have worked on!!! Lets hope I got it righht this time.
              Last edited by scootertrs; 11-13-2010, 02:13 PM.

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              • #22
                Get over to www.steelsoldiers.com There are several guys there that have restored these trucks. Have not been out of the system that long.

                Someone will send you a pdf of the mil manuals if they have not already been posted.

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                • #23
                  Originally posted by neiowa View Post
                  Get over to www.steelsoldiers.com There are several guys there that have restored these trucks. Have not been out of the system that long.

                  Someone will send you a pdf of the mil manuals if they have not already been posted.
                  I have the manual, but not really very detailed when it comes to the fire system.

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                  • #24
                    Originally posted by scootertrs View Post
                    I have the manual, but not really very detailed when it comes to the fire system.
                    As stated there are guys there who own and work on the old duece fire trucks that will be happy to help you.

                    There are seperate TM for most specialized bodys that were mounted on the M series trucks. The -24 and -24P will likely be the most useful to you.

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                    • #25
                      Thank you. I have received many, many helpful bits of advise from SteelSoldiers and have helped others in similar situations. There are some issues that are "fire truck site" specific and I thought more apprepriate to pump issues than SS(obviously correctly-if looking at the type of answers I received here).

                      I have the specialized manual for the Fire Truck body version, but when it gets to the pump breakdown and internal... it stops. Through help from SS, Hale, and members of this site, I think I have enough to get it done.

                      Thanks

                      Raul

                      Originally posted by neiowa View Post
                      As stated there are guys there who own and work on the old duece fire trucks that will be happy to help you.

                      There are seperate TM for most specialized bodys that were mounted on the M series trucks. The -24 and -24P will likely be the most useful to you.

                      Comment


                      • #26
                        Guys, thanks for making me re-look for the manuals... found 2 that are quite detailed. The parts and tools manual is TM 5-4210-205-35P and the depot dervice manual TM 5-4210-213-35. She is now drafting and pumping like new.
                        Thanks again
                        Raul

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                        • #27
                          Raul:

                          Glad that you were able to correct the plugged line and are now operating correctly. Sorry about dropping out of the conversation for the past week. Had to prep for a Train the Trainer session at a Community College. I'm not too proficient at powerpoint and Had to decide on content and hands on problems for the class. We have a 1917 American LaFrance Type 40 with a Junior pump that still operates, so I can appreciate the satisfaction when you are able to solve a perplexing problem. Thanks for the message, I'll keep the info just in case I get to go in your direction.

                          Kuh

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                          • #28
                            BTW guys, if anybody needs the manuals for the deuce and a half M35A2 fire truck, (or bloddy knuckle knowledge) just PM me or better yet, send me an email at [email protected]. I don't think there is much in this truck that we have not had apart... at least once!

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                            • #29
                              I think we finally may have it!!!

                              Was only able to get basic packing cooling and anytime I tried to get a drip, would lose all prime and all pressure when drafting. Took all apart ... again... and took pictures of every component as disassembled. I enclosed a picture of the packing area with just one section of packing and one half of the lantern washers installed. When the second lantern washer is put in its place, the volute hole is almost completly blocked. The packing that was originally in this truck was totally destroyed, indicating that this problem was probably there before we took it apart. I suspect that if the prior FD was running off hydrants, they would not have much of a problem running the packing a little loose... thus it worked, but when you have to get a draft... forget about it!!! We plan on bushing the seat for the packing up so that when it is in place, the volute will sit in the middle of the lantern washers. Thanks again Kuh... looks like you were right all along... just could not see the darned thing... once it was apart, it all looked good!!! I actally went back through all of the emails and manuals and knowing that I had to get water from somewhere and it had to go somewhere else... we even made sure that the volute hole was clear... but could not imagine it getting blocked during assembly... it took a while... but I am optimistic we got it. Getting ready to do another identical pump and noticed during disassembly that the volute, while not completly blocked by the lantern washers, it is definitely partially so... From now on, during disassembly and assembly of every pump... NOTE TO SELF... check the volute hole and its position in relation to the lantern washers...
                              Attached Files
                              Last edited by scootertrs; 12-01-2010, 06:20 PM.

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                              • #30
                                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.
                                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.

                                PS: I would like permission to use the photograph in my pump classes and presentations, if possible.
                                Last edited by KuhShise; 12-02-2010, 10:50 PM. Reason: use question

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