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  1. LCA078

    Documentation for cranking amps for the NHC250 and 6CTA?

    I know the military prefers over to have over 2,000 CCA available with their battery set up but I'm curious if there is any Cummins documentation on cranking amps needed for the M939 series. The reason is I'm looking at a getting a couple new Group 31 batteries and will need to determine if I...
  2. LCA078

    Fuel cap replacements?

    I need a new fuel cap for my M923. The little pot metal fillers in the four holes corroded to the point where they started leaking and falling out. The only reason I can think why they exist is that they would melt during a fire and allow pressure to escape the fuel tank so it doesn't explode...
  3. LCA078

    Self recovery with one person, one pickup, and one M939- how to do it?

    Here's the scenario: Pick your flavor of M939 series truck with a NHC250 is located 200 miles away. Seller says truck runs, tires are good, and license tags just ran out last month. The only issue is it's hard to start and dies at idle if you don't keep the rpms up (sounds like air leaks in...
  4. LCA078

    Reusable hydraulic fittings on wreckers

    I read a lot on SS that 5-ton wreckers (M936s for sure and maybe M816s) came with field repairable or reusable hydraulic fittings. But when I look on pics of M936s for sale, I don't see the kind of reusable fittings I'm used to seeing that have wrench flats where the crimp would be. I found a...
  5. LCA078

    M936A1 crane ops- basic questions for engaging transfer case PTO

    I'm going to inspect the crane hydraulics of a M936A1 that is reported to not work and I want to get knowledgeable on crane ops before I go see it . All I know is "PTO engaged but no hydraulic pressure to crane" so I'm guess this has a high probability of operator error. And yes, I have all...
  6. LCA078

    True failure rates of the 6CTA8.3L injector pump?

    I own three M939 series trucks with the NHC250 so I'm familiar with how air leaks in the fuel supply system can cause havoc. I'm hearing the 8.3L isn't too different in that air leaks (along with a bunch of other nit-noid things) cause a lot of no-start headaches that people originally...
  7. LCA078

    PN for bulk hose for oil pump to oil pan lines for Cummins 855 NTC 250

    I’m looking for bulk oil hose and searched all over here and the web but can’t find a part number or other descriptive way to explain to my local industrial hose shop what I need to replace my oil pump hoses. Not having luck with the local truck repair shops either. Was hoping to reuse the...
  8. LCA078

    M923 Troop Seats, Tarp and Bows

    Looking for a set of troop seats and a full set of tarp and bows for my 923 with standard drop sides. At least trying to understand what a decent set will cost me. Surprisingly, I'm coming up fairly empty on even finding prices from the usual major online surplus sellers. One did have them in...
  9. LCA078

    Seeking input on dump bed project

    A few months ago, I purchased a really clean military dump bed that looks like it was taken off a M51 Dump (M35 series 5-tons) as it has the PTO driven hydraulic pump that's integrated into the dump frame. My goals was to put it on my M925 after I shorten the frame a bit but since the M925 has...
  10. LCA078

    Why remove runflats?

    It seems like almost every surplus tire dealer removes the run flats from the tires they sell. I'm referring to the big rubber donuts that can't even be given away for free afterwards. My question is because I bought two XZL 16.00R20's already on HEMTT wheels from GP so I assume they have...
  11. LCA078

    Having trouble seating beads on 16.00 AT-3A's

    I picked up some unused Goodyear AT-3A's at my local govplanet. Tires are good shape and less than 3-4 years old on average but they were stored flat on a pallet so the tires are collapsed some. When I try to mount them on my combat rims, there is 2-3" inches of space between the bead and rim...
  12. LCA078

    Recommendations for oil analysis vendor?

    Between the M923 and other items in the motorpool, I probably need about 4-6 oil analysis samples done each year, if I'm lucky. Just need the usual data of high metals, fuel dilution, etc. to know if I got a failing system. Would love to see my data online and have it stored permanently for...
  13. LCA078

    NHC 250 cylinder inspection without removing head?

    I couldn't find anything in the forum about how to inspect the cylinder liners and piston heads without removing the head. Can you drop on borescope through the injector port? I think you need to remove a cup underneath the injector to drop through, but even then I'm not sure what is the...
  14. LCA078

    NHC 250 goes past idle and dies when letting off throttle

    Truck starts and runs solid. But when I let off the throttle to turn a corner or such, the engine rpm drops below idle and sometimes dies on me. Not a fun time when turning so I generally keep the throttle pressed a bit. I looked through the forum but only found the this thread that says the...
  15. LCA078

    Source for 5/8-18 thread wheel stud flange nuts?

    Looking for a source of quality flange nuts for studs that LMTV wheels together. Need at least 60 but will take a hundred since 20 per wheel. Any recommendations?
  16. LCA078

    475lb torque sticks-- any good?

    I'm slowly building my pile of tools and items to super single out my M923 with 16.00r20's. I have all the tires and wheels but still need the shoulder lug nuts for the front HEMTT wheels, new o-rings and air stems for regular combat wheels for the rear axles. I tried to breakdown a couple...
  17. LCA078

    Civilian pn for muffler gasket M939? Or other way to seal?

    I'm replacing my muffler on the M923 with NHC250 (I think same muffler regardless of engine?). It's the typical rusted out around the bottom and a safety hazard. Anyone know a civilian part number for the gaskets? Or a way to use some other sealer besides the OEM gasket?
  18. LCA078

    Lug nuts to single out M923 M939

    Singling out my M923 to 1600r20's. I have two HEMMT wheels for the front and the two piece combat wheels for the rears. Latest 'right' answer I saw was to buy the shouldered lugs (pic attached) on the fronts for the HEMMT wheels and then re-use the original front lug nuts for the rear combat...
  19. LCA078

    Educate me on the dump...the M929 / M930

    The dump bed on the M929/930 is shaped differently than civilian dump trucks and has an odd gate arrangement. I'm interested in getting one to move build roads on my place, haul brush/trees to the burn pit, etc. but not sure how well it's suited for those tasks. The civilian dump trucks are...
  20. LCA078

    Need pn for cam follower for NHC 250

    Cam follower is cracked on my M925 parts truck with NHC 250. I want to see if the engine is salvageable so need to replace the follower before playing with it. I’m sure these are plentiful but don’t know the commercial part number(s). And any recommendations for a parts house?
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