Johnny 520 carb or fuel problem??
Page 1 of 2 1 2 LastLast
Results 1 to 10 of 11
Like Tree4Likes

Thread: Johnny 520 carb or fuel problem??

  1. Top | #1

    Join Date
    Jun 2018
    Last Online
    06-25-2018 @ 08:01 PM
    Location
    Marion, NY
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Johnny 520 carb or fuel problem??

    Good day friends,
    I have a 1956 JD 520. It seemed to be flooding out, so I got a carb rebuild kit ... rebuilt, put back together (sorta) -
    1st problem: I can't figure out how to get the springy thing to work in the choke linkage. It seems simple, but the spring doesn't hold the choke closed.
    2nd problem: the tractor starts up runs for 10-20 seconds and dies off. It seems like it's not getting enough fuel??
    any thoughts?

    thank you. - Tim

  2. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  3. Top | #2
    johnH123's Avatar
    Join Date
    Feb 2015
    Last Online
    Today @ 11:20 AM
    Location
    Indiana
    Posts
    4,343
    Thanks
    461
    Thanked 325 Times in 275 Posts
    When it does it, disconnect the line and verify flow. also, will it run with the choke on?
    - 2002 John Deere 4510 TLB PR,
    -Woods BB60X 60" rotary cutter
    -Countyline box blade,
    -Allis Chalmers sickle mower,
    -RED windrow rake,
    -titan 48" 3000 pound forks/bale spear
    - Farm Star rear bale spear

    Yamaha Rhino 700, Yamaha Rhino 660,
    Murray 624 mower/38" deck

  4. Top | #3

    Join Date
    Dec 2013
    Last Online
    07-21-2019 @ 07:23 AM
    Location
    Beaver Dam WI
    Posts
    49
    Thanks
    0
    Thanked 5 Times in 5 Posts
    Do you have your high and low speed needles set correctly?

  5. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  6. Top | #4

    Join Date
    Jun 2018
    Last Online
    06-25-2018 @ 08:01 PM
    Location
    Marion, NY
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts
    I have the two jets turned back 1 1/2 turns from bottom. When it runs for those few seconds it seems to run smooth.

    I'll try pulling the gas line to see if there is flow.

    thank you,.

  7. Top | #5

    Join Date
    Feb 2015
    Last Online
    Today @ 09:18 AM
    Location
    Ohio
    Posts
    340
    Thanks
    126
    Thanked 86 Times in 70 Posts
    I may be way off base with this idea. If so, just ignore the ramble.
    I'm thinking the fuel shut off is controlled by engine oil pressure on this model so if oil pressure is lost while the engine is working, the fuel will automatically shut off to avoid engine damage. In the case of a carb. removal/repair, wouldn't there be a manual override to refill the carb. bowl for the first start? If you are familiar with this feature, please explain how it works when you disconnect the fuel line to test for flow. (I have never owned anything newer than a "B")

    It could be as simple as a blockage in the tank, sediment bowl filter, or the inoperative choke. Keep us informed. I'm sure interested!

    tommyhawk
    BigJim55 likes this.

  8. Top | #6

    Join Date
    Dec 2013
    Last Online
    07-21-2019 @ 07:23 AM
    Location
    Beaver Dam WI
    Posts
    49
    Thanks
    0
    Thanked 5 Times in 5 Posts
    Check the fuel metering screw on bottom of carb bowl , loosen nut and center screw should be turned out 2 1/2 to 3 turns. your fuel shut off should be control by oil pressure.

  9. Top | #7

    Join Date
    Jun 2018
    Last Online
    06-25-2018 @ 08:01 PM
    Location
    Marion, NY
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    520 carb

    Thank you very much! LOL - I can't believe it ... I think that when I rebuilt it I screwed that in all the way, and never backed it back out. I'll try it later today.
    Tim

  10. Top | #8

    Join Date
    Jun 2018
    Last Online
    06-25-2018 @ 08:01 PM
    Location
    Marion, NY
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    520 carb problem?? electrical? switch?

    LOL - Now it will only stay running as long as I hold the starter pedal down! It starts right up, runs great, but as soon as I release the starter it shuts off. Is this a malfunction of the switch (on, lights, etc.) on the dash, or is there some other wiring problem?

  11. Top | #9
    Keeper of the GTT Cookies dieselshadow's Avatar
    Join Date
    Nov 2011
    Last Online
    Today @ 09:07 AM
    Location
    Joelton TN
    Posts
    19,699
    Thanks
    1,064
    Thanked 4,257 Times in 2,563 Posts
    Check to see if you have power going to the coil with the ignition turned on. If not, you need to troubleshoot why. Follow the wire.
    BigJim55 and tommyhawk like this.
    - Jason

    GreenTractorTalk.com Rules, Policies, and Terms of Use

    Subscribe to dieselshadowman on YouTube

    2720 w/ 200CX FEL
    , Ken's weld-on hooks, Fit Rite Hydraulics Top and Tilt kit, Artillian forks.
    1954 60 - getting full restoration, 1964
    110 round fender in the shop for crustoration
    Ferris IS3200Zzero turn mower

  12. Top | #10

    Join Date
    Jun 2018
    Last Online
    06-25-2018 @ 08:01 PM
    Location
    Marion, NY
    Posts
    5
    Thanks
    0
    Thanked 0 Times in 0 Posts

    520 Carb & electrical problems! Thank you

    After I rebuilt the carb ... then it wouldn't stay running. You were correct - no power to the coil. I traced back and found a wire had come off the battery terminal. It's now up and running smooth .... well accept for the fact that I don't have the intake/air cleaner put back on yet.
    ** I'm still trying to figure out the choke connection. It has a spring in it, but it doesn't seem to hold the plates open or closed ... I can't seem to be able to get the spring to do any thing. Is it possible that I have the choke plates in wrong?
    DRobinson likes this.

  13. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

Page 1 of 2 1 2 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts