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Case 420CT Series 3 won't start intermittently, even right after turned off.

Discussion in 'Compact Track/Multi Terrain Loaders' started by HandyDan, Sep 2, 2016.

  1. HandyDan

    HandyDan New Member

    Joined:
    Sep 2, 2016
    Messages:
    3
    Location:
    Alberta, Canada
    Hey guys, I am new to the forums. Looking forward to being a member.

    I recently purchased a 2010 Case 420ct series 3 with 1200 hours and have been running into issues. Problem is, I will be operating the machine, turn it off and it won't start back up again. Hydrostatic and oil pressure warnings are flashing and beeping, it also flashes 11 volts on hour readout.

    At the start I figured it was a sensor and had to do with the angle of the machine. I would tow it level and it would start again, but I think that could have just been coincidence. I replaced the hydraulic filter and hydraulic pressure sensor to no avail.

    I found that the 25 amp starter fuse was blowing, so I moved on to the starter relay as it wouldn't even crank a little with the key on ignition, but found that bridging the relay while the key is on does nothing. Right now I am stuck on the possibility of starter or battery, but the two flashing hydrostatic pressure and oil lights have me stumped.

    Key points:
    Problem occurs right after shut off and intermittently corrects itself.
    Hydrostatic light flashing Oil Light flashing
    11 Volt flashing on readout
    No crank at all
    Replaced hydraulic oil filter (no help)
    New hydrostatic sensor (no help)
    Starter fuse blowing occasionally
    Bridging starter relay does nothing (no crank at all)

    Any insight is appreciated
     
  2. HandyDan

    HandyDan New Member

    Joined:
    Sep 2, 2016
    Messages:
    3
    Location:
    Alberta, Canada
    Update: Battery ok.
    Going to check wiring as the starter relay fuse blows a lot!
    Still no idea why those lights are the ones flashing
     
  3. DIYDAVE

    DIYDAVE Senior Member

    Joined:
    Feb 18, 2007
    Messages:
    374
    Location:
    MD
    Check ALL grounds, starting at the battery...
     
    soilmover2 likes this.
  4. Canuck Digger

    Canuck Digger Well-Known Member

    Joined:
    Dec 24, 2012
    Messages:
    134
    Location:
    Mission, BC
    I ain't no mechanic, but does sound like a ground or contact issue of some sort...
     
  5. HandyDan

    HandyDan New Member

    Joined:
    Sep 2, 2016
    Messages:
    3
    Location:
    Alberta, Canada
    It is sure looking that way. I guess the ECU just doesn't like it and that's why I'm getting the lights.
     
  6. GaryHoff

    GaryHoff Senior Member

    Joined:
    Feb 26, 2009
    Messages:
    528
    Occupation:
    Heavey Equipment Mechanic
    Location:
    Alberta, Canada
    So if you jump the starter relay, (pins 87 to 30) the machine will not crank? (also you should have 12v at pin 30)
    When does the starter relay fuse blow? If the starter relay fuse is blowing then you likely have a shorted wire from the starter solenoid or a failed starter solenoid.
    Does this machine have auxiliary hydraulics? Does it have the foot pedal for the auxiliary hydraulics?
     
  7. jamesoro

    jamesoro New Member

    Joined:
    Feb 17, 2017
    Messages:
    1
    Location:
    Lethbridge, Alberta
    I have run into a similar problem with our case 420ct. After it has been used for awhile and shut down it fails to start, identical to HandyDans except no blown fuses. If you let it cool down it will start. While it's hot I can hear the clicking but no go. It may or may not catch while it's hot. I notice there is a fuse looking thingy coming off the selenoid that has no fuse in it. Does anyone out there know what it is? I cleaned up the ground connecting to the frame that comes off the starter and cleaned up the connector junction that sends power up to the grid heater but don't see anything obvious. HandyDan, did you figure out your issues yet? I also took in the starter and they put a new selenoid on the starter. Could I have been sold a bad selenoid? Thanks James
     
  8. soilmover2

    soilmover2 Member

    Joined:
    Feb 28, 2017
    Messages:
    6
    Location:
    central illinois
    I have found that the battery disconnect switches get corroded inside. also, the terminals on the outside of it will break but still look attached until pulling on them. check all grounds