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  1. #1
    New Member
    Join Date
    Sep 2011
    Posts
    7
    Tractor
    JD 4630 JD 4020

    Default JD 4630 Won't Start

    I changed the oil, started the motor, cheked level, a little high, so I drained the oil filter. The tractor would not start again. It rattled the first attempt, then nothing. When I turned the key as to start, the other gauges would "hump up"(move a little in the opposite direction). I cleaned all the ground and othe connections on cables and starter. I found a small crack on the starter solinoid(Noponso starter and selonoid, Not JD)I orderd a new solinoid. Could this be the problem? I have always had to disconnect the left ground and the hot to the starter or the batteries would discharge. The batteries were charged and showing 14 volts. I was getting 13.8 volts at the starter terminals. Any suggestions? Also I did not mark all the connections on the solinoid when I removed it, does any one have a diagram so I don't short it when I install the new one? It was back ordered and has been over 3 weeks and my memory may not be what I thought it would be when I removed it!

  2. #2
    Platinum Member
    Join Date
    Sep 2010
    Posts
    724
    Location
    Virginia
    Tractor
    5210 MFWD

    Default Re: JD 4630 Won't Start

    I have been putting together a general list to answer this question. Hopefully it will give you some places to look.

    Nothing happens when you turn the key
    - Check battery under load
    o Lights dim when turning the key is a classic symptom of a battery going bad.
    - Check all starter connections (including grounds) for corrosion and tightness
    - Check fuses
    - Safety switches (seat, PTO, neutral switch)
    - Make sure in Park/Neutral HST pedals in neutral position/centered
    - Make sure you have power at the starter/solenoid
    - Make sure starter and solenoid working

    Starter IS working
    - Do not run the start for more than 20 seconds
    - Make sure intake is clean
    - Do you have smoke coming out of the exhaust
    - Water in fuel ?
    - Glow plugs not working

    No smoke from exhaust not getting fuel
    - Make sure you have fuel in the tank
    - Loosen fuel cap, tank may not be venting correctly
    - Replace fuel filter
    - Check fuel line for holes as this can put air in the line
    - Check fuel line not clogged (both supply and return)
    - Check that fuel tank not clogged at the bottom
    - Bleed tractor check manual for how to do this
    - Bleed injectors

    Smoke from exhaust getting fuel
    - Bleed injectors

  3. #3
    New Member
    Join Date
    Sep 2011
    Posts
    7
    Tractor
    JD 4630 JD 4020

    Default Re: JD 4630 Won't Start

    Wow! Sounds like I have some work to do. I'll get going on it. Thank you.

  4. #4
    Platinum Member
    Join Date
    Sep 2010
    Posts
    724
    Location
    Virginia
    Tractor
    5210 MFWD

    Default Re: JD 4630 Won't Start

    It is not as bad as it looks, just wanted to cover all the bases. Sounds like you have already done a few things, so you can check them off.

    Please let us know how it goes.

  5. #5
    Elite Member Tx Jim's Avatar
    Join Date
    Jan 2007
    Posts
    4,852
    Location
    North Texas
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: JD 4630 Won't Start

    Frank
    If your battery voltage is correct,all 6 battery connections are clean & tight then I'd check the neutral(safety) start switch on RH side of trans case for continuity.

  6. #6
    New Member
    Join Date
    Sep 2011
    Posts
    1
    Tractor
    John Deere 4630

    Default Re: JD 4630 Won't Start

    does anyone know what sort of battery you need for a 4630? i have just bought one but the battery was shot, it only have one and i guess its a 12 volt. any suggestions?

  7. #7
    Super Star Member
    Join Date
    Aug 2001
    Posts
    12,098
    Location
    Upper Midwest USA
    Tractor
    JD 4300, JD X485 JD 4x2 Gator, JD 425, JD455

    Default Re: JD 4630 Won't Start

    Aussie


    There are two 6 volt batteries, as listed in jdparts.

    TY21735 DRY CHARGED BATTERY QTY 2 6-VOLT, 850 COLD CRANKING AMPS AT -18C (0F), 280 MINUTE RESERVE CAPACITY AT 25 AMPS, (SUB FOR AR47455 OR TY6119)

    Maybe there has been some tinkering to change to a 12v system. ??

  8. #8
    New Member
    Join Date
    Sep 2011
    Posts
    7
    Tractor
    JD 4630 JD 4020

    Default Re: JD 4630 Won't Start

    My 4630 has two 12 volt batteries, one on each side. Mine wouldn't start because there was a short in the starter. BTW, those two batteries need to be fully charged and all hot and ground connections very clean. She will "snort" if she has plenty of umph.....

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