Results 1 to 5 of 5
  1. #1
    New Member
    Join Date
    Aug 2012
    Posts
    3
    Location
    Junction City, Oregon
    Tractor
    B7800

    Default B7800 cranks but will not start

    I was called by a neighbor that their tractor was running fine one min, then when shut off, failed to start again later. Engine cranks strong... just won't fire. I checked bat voltage and it was fine, checked fuel system from pri filter towards fuel pump and that was good, return fuel supply was good too.

    Removed fuel shutoff sol and started machine (i use my finger to push barrel in fuel pump to cut off engine) I measured resistance across fuel shut off sol terminals and got 20 ohms (and dropping) so I bought a new sol... installed it and nothing.

    As far as I know... all safety switches are in working order, ie; I have placed pto in gear and engine won't crank, didn't push clutch in and also... engine won't crank, ect... ect...

    I guess what my question is... are there any safety switches that (if serviceable) will allow the engine to crank? Are any designed to allow the engine to crank, yet halt fuel flow... therefore not allowing the tractor to start? I'm at wits end on this one and I just know that there is probably a quick fix out there. One more thing, pretty hard to diagnose by myself but I could swear there was NO power readings at that little connector (to the fuel shut off sol) when the key is turned on to crank... nor turned off. I think that is where my problem is but must first rule out these stupid safety switches they put on these tractors.

    Thank you!

  2. #2
    Veteran Member banjodunn's Avatar
    Join Date
    Jun 2008
    Posts
    1,169
    Location
    Oz

    Default Re: B7800 cranks but will not start

    G'day and have you checked for a seat switch? Also have you checked the fuse that powers the shutdown?

    Jon

  3. #3
    New Member
    Join Date
    Aug 2012
    Posts
    3
    Location
    Junction City, Oregon
    Tractor
    B7800

    Default Re: B7800 cranks but will not start

    Hi Jon, I have checked the safety switches.... from what I was told at the dealer, if a safety switch is inop or if the situation exists to not allow the tractor to work ie, not sitting in seat, clutch not engaged, pto in gear, ect... then the engine will NOT crank at all (and it cranks just fine.... it just won't start and run) The guy at the dealer had sort of a puzzled look when he told me that so I was trying to confirm or deny his statement.

    To answer your question about the fuse box.... Power is at fuse box and the fuse for the fuel sol (30A)is ok. Also, there is power at engine stop fuse... and that fuse is OK. Do you know where that engine stop relay is on the machine? I tried removing the inst panel but afraid to rip and tear it off. Looks like screw driver slots on top but I'm at a loss on how to open it up... sure hate to break anything!

    Thanks for keepin tabs on this btw, Dave

  4. #4
    Veteran Member Jerry/MT's Avatar
    Join Date
    Feb 2008
    Posts
    1,963
    Location
    Western Montana
    Tractor
    New Holland TD95D, Ford 4610 & Ferguson TO-30

    Default Re: B7800 cranks but will not start

    Most of the safety switch wwhen open will not allow starter engagement. I'd look at fuel delivery. Perhaps a clogged fuel strainer at the tank out let.

  5. #5
    New Member
    Join Date
    Aug 2012
    Posts
    3
    Location
    Junction City, Oregon
    Tractor
    B7800

    Default Re: B7800 cranks but will not start

    Well, as I wrote before... the engine starts and runs just fine (with the fuel shut off sol... removed) But thanks anyways for throwing your 2 cents out there. The problem is the engine won't start (it cranks) with the fuel sol installed...

Similar Threads

  1. Cub LT1045 Cranks but Won't Start
    By MPVawter in forum Cub Cadet L&G
    Replies: 14
    Last Post: 06-24-2013, 09:23 PM
  2. JD 4400 Cranks...Won't Start
    By FastPauly in forum John Deere Owning/Operating
    Replies: 13
    Last Post: 02-22-2012, 10:25 AM
  3. ck 30 cranks, won't start
    By jss in forum Kioti Owning/Operating
    Replies: 19
    Last Post: 03-10-2010, 11:07 AM
  4. Boomer TC40D Cranks but Does not Start
    By DHayesJr in forum New Holland Owning/Operating
    Replies: 4
    Last Post: 06-11-2009, 12:02 PM
  5. 4410 CRANKS OK WONRT START
    By jfuller5 in forum John Deere Owning/Operating
    Replies: 5
    Last Post: 12-04-2007, 06:59 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2013 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.