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NH 250 Cummins front end power takeoff

Discussion in 'Shop Talk' started by Tugger2, Jul 20, 2019.

  1. Tugger2

    Tugger2 Senior Member

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    I have an NH250 in one of the cranes,i would like to run another hydraulic pump for a third drum on it. The accessory drive is loaded up so im wondering about driving off the front of the crank. Making an adaptor to fit the bolt flange inside the vibration damper seems straight forward. My question is will the front of the crank take 20 or 25 HP. of intermittent load assuming i dont side load or end load it too much.
     
  2. crane operator

    crane operator Senior Member

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    All the Grove tms 300-475's drove the hyd pumps off the front crank. Engines are either 6-71 or cummins 230-250's. Bolt on plate with yoke/ ujoint to a 2' driveshaft driving the gearbox and 2- 2 stage pumps.

    my P&H 70 ton drives its pumps the same way off a 6v92 front crank.
     
  3. Tugger2

    Tugger2 Senior Member

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    Good to hear . Ive driven lots of things off the front of Detroits , This is my first Cummins in the fleet . Just needed some reassurance. Thanks
     
  4. mitch504

    mitch504 Senior Member

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    Look around and see if you can't find an old mixer or municipal snow plow that has the parts you need.
     
    DMiller, kshansen and hvy 1ton like this.
  5. kshansen

    kshansen Senior Member

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    I was thinking along the same line, mixers and plow trucks and even the water truck we had at the quarry all use front of crank to power pumps, just use a drive shaft or some flexible coupling to take stresses off crank.
     
    DMiller likes this.
  6. DMiller

    DMiller Senior Member

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    Mixer will be the best shot. Check the ready mix works nearby as to dead troopers they have 'Out Back'.
     
    repowerguy likes this.
  7. Tugger2

    Tugger2 Senior Member

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    Thanks guys . Ill have to hit the scrapyard for a look.
     
  8. crane operator

    crane operator Senior Member

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    I think you would be better off to just take the dampner to a machine shop with a bolt on u joint flange. Drill and counterbore holes for the bolts thru the dampner, and bolt on with heavy counter sunk allen head bolts. Drill and tap the adaptor for a 4 bolt ujoint flange. Bolt the dampner and adaptor back to the engine first, then the ujoint flange to the adaptor.

    Finding anything that is big or small cam cummins in a mixer or municipal truck would be unlikely in my area. Most of them that are cummins are 8.3 and m11/ l10. Very few around here would be 855. I think the time spent searching for the right flange, would pay for the machine shop to just make it.
     
  9. DMiller

    DMiller Senior Member

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    Older mixers that should be in bone yards were either 6L71 or 250s for the most part around here. A few odd 3208s a fewer still Ford 7.8L and a great many IHC with DTs.
     
  10. Tugger2

    Tugger2 Senior Member

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    A quick call to the scrap guys confirmed that. We can make the stuff in my shop anyhow,just would have been nice to save a bit of time.Around here the redimix outfits stipulate that their old trucks are completely destroyed , non competition .
     
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  11. kshansen

    kshansen Senior Member

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    Do they not even sell off components like engines or transmissions?
     
    DMiller likes this.
  12. DMiller

    DMiller Senior Member

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    If like Kienstra St Louis once sent to scrapper truck is either crushed or shredded
    Engines gas axed out
    Have to catch them at home yard and being used fir pieces as already written off
     
  13. Tugger2

    Tugger2 Senior Member

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    I bought a 4/71complete from the hyd pump to the rad off the scrappers once. It came out of a gradeall which is a pretty simple takeout , but they bashed the crap out of it.Another time they dropped a nice lister genset off the side of a barge they were dismantling for me. It seems hard to get good parts out the scrappers . You would think the value added would warrant the cost of taking better care of this stuff.
     
    DMiller likes this.