76 k100 won't shut off

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 76K100, Mar 27, 2023.

  1. 76K100

    76K100 Light Load Member

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    Mar 13, 2023
    WISCONSIN BUT FROM NOR CAL
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    so I also see they sell the shutoff solenoid and they coil either separate or package. which do I need or ####it and get the whole assembly?
     
    Oxbow Thanks this.
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  3. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    West Virginia
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    Did you use a voltmeter and check to insure the voltage at the solenoid on top the pump is 12 volt?

    Did you have someone turn the engine off while you checked the solenoid to insure the voltage stopped when the key was turned off?

    No need of spending $$$ for stuff you don’t need.

    The solenoid will fit small cam pumps as well as big Cam pumps.


    Had to replace the solenoid on my bucket of bolts few years ago for similar problems you are experiencing…..
     
  4. Oxbow

    Oxbow Road Train Member

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    Something you may not be aware of, and @OLDSKOOLERnWV help me out here, on those SP switches, if the starter solenoid went bad, you could unscrew the cap and there was a spring loaded plunger (for lack of the proper term) that you could push that would engage the starter. I'll bet @OLDSKOOLERnWV has a picture of one.
     
    76K100, OLDSKOOLERnWV and Last Call Thank this.
  5. BoxCarKidd

    BoxCarKidd Road Train Member

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    Check for no voltage to solenoid with the key off as mentioned. You should have 12 volts there with the key on. If there is 24 volts there you have serious wiring issues.
    The harness by the steering box was a common issue as mentioned.
    Be sure the thumb screw in front of the solenoid is backed out enough to shut off. Might have to use a tool not just your thumb.
    If you decide you need a solenoid I would buy the whole thing not just the electric part.
     
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  6. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Question is….. is there power on the solenoid when the key is turned to the off position with the engine still running….
     
    76K100 and Oxbow Thank this.
  7. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    Don’t have a pic right now, but yes there was potential to manually operate the SP, at least the ones I’ve been around.


    I’ve been around these Cummins since 1987, but still we tend to learn things.


    There is a mechanical issue that will cause the problem he is experiencing, I’m trying to remember what the hell it was, been a long time….
     
    76K100, Oxbow and BoxCarKidd Thank this.
  8. BoxCarKidd

    BoxCarKidd Road Train Member

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    12V
     
    Oxbow Thanks this.
  9. BoxCarKidd

    BoxCarKidd Road Train Member

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    Some jerk put a dime in the fuel return line and the hole drilled in it is way small. That will keep them running awhile.
     
    Oxbow and OLDSKOOLERnWV Thank this.
  10. OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

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    West Virginia
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    lol, yea I remember that trick to gain a little power on the hills.

    When I was driving my 1973 Cabover Kenworth in the 80’s I was up in Ohio late one night.

    I’d been driving for a couple hours none stop, was coming off an exit and realized the rpm’s wouldn’t drop below a 1000 rpm.

    Sure made it difficult to shift. I finally got in to a fuel stop and started looking. Couldn’t figure it to save my life.

    Hated to do it, but dug out $.25 and called my dad knowing he was in bed.

    We conversed for a few minutes then he started asking about the fuel lines. Wanted to know how old they were.

    I told him far as I know they are original to the truck. Truck had a 335 Cummins / 9 speed.

    He ask if I had any wrenches, yes I do I told him. Then he told me to take the fuel return line off and switch ends with it.

    Switched the line and it idled high for just a second then went to an idle as it should.

    The rubber inside the line was breaking down, and a piece had lifted up / rolled up causing a gate valve in a sense because it was still partially attached. Switching the line changed the fuel flow and it laid back down.

    Little things can create big problems lol….
     
  11. 76K100

    76K100 Light Load Member

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    Mar 13, 2023
    WISCONSIN BUT FROM NOR CAL
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    replaced fuel lines to #12 and all it was the nut holding wire lead on was loose.I want to express how grateful I am for all the responses I've been a classic car guy my whole life but recently sold my 1960 classic to buy this new venture in my life pppp.jpg
     
    haycarter, BoxCarKidd, Oxbow and 2 others Thank this.
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