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PTO gerenator with PTO pump

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  • #16
    Why not go with a split shaft pump such as a Hale APMG? It will give you the 500gpm flow you are looking for and leave the pto open for the generator.

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    • #17
      A problem that can occur when using a PTO generator with either a PTO or split-shaft pump is that when you are pumping, the generator is spinning higher than normal (most are geared to produce full power at idle), which COULD lead to problems.

      That or you'l have to gear the PTO down so that it's running at normal RPMs when the pump is running, meaning that you now have to run the truck at high RPMs just to make power.

      A hydraulic generator solves this problem, because it automagically compensates for fluctuations in vehicle RPM.

      That or you could put a stored-energy CAFS on the truck instead of a tank and pump.

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      • #18
        Quick clarification... there are no PTO direct drive generators that I'm aware of that can be used at varying RPM's. They have to spin at a specific RPM to produce the correct voltage and frequency. Anyone know otherwise???

        Hydraulic generators pumps put out enough pressure at idle through redline to keep the generator spinning at the proper RPM... Smart Power also throws in a proportioning valve to further keep the frequency right at 60Hz.

        Gas/Diesel units operate at a fixed RPM. Pretty self-explanitory on this one.
        TruckCommittee.com

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        • #19
          Originally posted by UFDFF15 View Post
          From what i understood from the explanation, there is two PTO ports 1 large 1 small and the PTO generator and PTO pump both require the larger one, and the hydraulic generator can use the smaller port and get's full power at idle. the dealer pitching the PTO said the hydraulic requires a lot of maintenance. And the dealer pitching the hydraulic says that the PTO will wear a lot quicker due to it being under the truck with all the chemicals etc that are used on the roads in the Northeast.

          Ironsman: for some reason the chief is dead set against a diesel genset because the maintenance required. Which is quite funny because we have had one on our ladder for 8 years and have never had a single problem with it.
          I can speak for hydraulic generators as all of the newer apparatus Dalton ordered had them. Maintenance was minimal on them, we had to change the fluid once a year, or as needed but it was rarely needed. Other than that, we checked fluid levels every morning and checked the color of the fluid through the level sight. Our hydraulic gen's worked great. Be careful what manufacturers tell you, they'll say anything to sell wht they're marketing.

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          • #20
            Yes, do be careful... you want to listen to what they tell you, but also do your own homework. There are a lot of things available for the fire service today that make life easier on everyone, but many don't even look at them because they feel that everything is a sales pitch. If you do your own research, you'll come out alright in the end.
            TruckCommittee.com

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            • #21
              Originally posted by Tim1118 View Post
              Quick clarification... there are no PTO direct drive generators that I'm aware of that can be used at varying RPM's. They have to spin at a specific RPM to produce the correct voltage and frequency. Anyone know otherwise???

              Hydraulic generators pumps put out enough pressure at idle through redline to keep the generator spinning at the proper RPM... Smart Power also throws in a proportioning valve to further keep the frequency right at 60Hz.

              Gas/Diesel units operate at a fixed RPM. Pretty self-explanitory on this one.
              Ravens Technology currently makes 5 kW and 7 kW direct drive unit utilizing some unique technology to produce 60 hZ at pretty much any prime mover speed. They can be PTO or belt driven. At present, 7 kW is as high as they go. I know they had a 15 kW unit on the drawing board, but I don't think they have any near term plan to bring it to market.

              The drawback of the technology is that it is sensitive to inductive loads. So if you want to use the power to operate motors (fans, for example), you would have to actually try them on one of their units to see if it would function properly.

              When I spoke with them they were very open about what they could and could not do. If your needs are primarily for lighting, they might have something for you. But then, DC works for most lighting also.

              Their web site provides a lot of good info, including explaining the technology. www.raventechpower.com.

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              • #22
                I would have to agree with others here, hydraulic generators in my experience have been very reliable and virtually maintenance free. We have 2 pumpers with 8kw Harrison's. We have also experienced a pto driven generator on a '96 International recue which we experiences a few problems.

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