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  1. #1
    Bronze Member
    Join Date
    Apr 2008
    Posts
    87
    Tractor
    Mahinda 7520

    Default 7520 preheater not working, EMERGENCY!

    Hey folks,
    My 7520 is 1.5 years old, and works great but has trouble starting cold. The light on the dash that looks like a heater coil only comes on for a few seconds when I turn the key to on position, then it goes out and the green healthy light comes on. I try to start and it chugs white smoke if the temp is below 30. Runs fine otherwise.
    I believe the preheater is thermostatically controlled, and the coil light should come on and stay lit for 30 seconds or so, when it's cold out. So first question, how can I trouble shoot this?
    More important question is how can I get this thing to start. We've got a foot of snow on the ground and my tractor won't start! Is there a way I can jump from the battery directly to the preheater and just manually do it? Or could I put some heating pads on the block or fuel pump to get it going? Advice??

    Thanks!

  2. #2
    Platinum Member
    Join Date
    May 2002
    Posts
    740
    Location
    Close to Petersburg
    Tractor
    Mahindra 2516

    Default Re: 7520 preheater not working, EMERGENCY!

    Maybe your battery voltage is low??? Might want to hook it up to a charger or try hooking it up to a vehicle. Glow plugs draw a lot of current. If it is parked in your garage (like mine is ) you can put a heater and try to raise up the temp. How COLD is it? You might have other issues such as gel'ed fuel etc? Good luck and let us know what it turns out to be.

  3. #3
    Bronze Member
    Join Date
    Apr 2008
    Posts
    87
    Tractor
    Mahinda 7520

    Default Re: 7520 preheater not working, EMERGENCY!

    It's right at 30 degrees, not cold enough to gel anything. I've checked the manual and it says the heater coil light should be on for 35 seconds after putting the key to on position, and it's just not coming on. The engine cranks ok, so I don't think it's the battery, but I can certainly try jumping it.

    Looking at the wiring diagram, it looks like it should be easy to jump from the battery to the heater element. Think I'll give that a try, but right now I have other stuff going on, so it'll be a bit before I give it a go.

  4. #4
    Silver Member UncleBuck01's Avatar
    Join Date
    Dec 2004
    Posts
    205
    Location
    NY
    Tractor
    Mahindra 4110

    Default Re: 7520 preheater not working, EMERGENCY!

    Quote Originally Posted by jrlogan View Post
    It's right at 30 degrees, not cold enough to gel anything. I've checked the manual and it says the heater coil light should be on for 35 seconds after putting the key to on position, and it's just not coming on. The engine cranks ok, so I don't think it's the battery, but I can certainly try jumping it.

    Looking at the wiring diagram, it looks like it should be easy to jump from the battery to the heater element. Think I'll give that a try, but right now I have other stuff going on, so it'll be a bit before I give it a go.
    On my 4110 I turn my key left ( like I want to listen to radio in my car )for glow plugs , After the coil lite goes out on dash I turn key to right to start. If temp is in the 20's I cycle the glow plug twice. hope this helps
    Buck
    My tractor is not a toy, its one of many tools of the trade, 2002 Mahindra 4110

  5. #5
    Veteran Member
    Join Date
    Nov 2005
    Posts
    1,678
    Location
    Casey County, Kentucky

    Default Re: 7520 preheater not working, EMERGENCY!

    I don't use my 7520 much when it's cold but I am thinking that my "coil" light stays on long after the green "healthy" light comes on. Once I see the healthy light, I turn the key and it fires right up as long as it is not down in the low twenties or teens. Then it starts hard so I put a block heater on it.

    I would put some halogen lights on it to get it warmed up. If you have at least one, aim it near the injection pump. Keep an eye on it so you don't melt anything rubber or plastic. Put a charger on the battery set on a low charge for an hour or so. Crank the amperage up when you go to start it.

  6. #6
    Veteran Member
    Join Date
    Sep 2005
    Posts
    1,688
    Location
    Batavia, NY
    Tractor
    Mahindra -------------

    Default Re: 7520 preheater not working, EMERGENCY!

    First of all the 7520 doesn't have glow plugs, but they can be added as an option. The heater indicated on the instrument panel, is an intake heater which isn't as effective as glow plugs, but it helps.
    At 30 degrees the 7520 should fire up without the heater, but if I were you I would install a block heater, which I think most of us dealers keep them in stock, at least I do. I have always installed the block heater at the point of sale, so I haven't had any complaints about starting. I will be in the shop tomorrow and will look in the service manual to see if I can find you any help.
    Galen LaWall
    Your Mahindra Tractor Dealer
    185 Pearl Street
    Batavia, New York 14020
    585.343.0770

  7. #7
    Platinum Member
    Join Date
    May 2002
    Posts
    740
    Location
    Close to Petersburg
    Tractor
    Mahindra 2516

    Default Re: 7520 preheater not working, EMERGENCY!

    There ya go! Seems like that is the ticket! (above)

  8. #8
    Veteran Member
    Join Date
    Nov 2005
    Posts
    1,678
    Location
    Casey County, Kentucky

    Default Re: 7520 preheater not working, EMERGENCY!

    Quote Originally Posted by manganos View Post
    There ya go! Seems like that is the ticket! (above)
    You bet! Galen hooked me up. I used it once this year already. About two hours and I did not even need to preheat the intake.

  9. #9
    Super Member
    Join Date
    Feb 2006
    Posts
    8,080
    Location
    VA
    Tractor
    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: 7520 preheater not working, EMERGENCY!

    The 7520 has a relay that energizes the intake manifold heater for about 45s after the ignition is turned on. Try this: Turn ignition on, raise hood and look at the intake manifold on the left side of the engine. There are wires [Ground&+] leading to it for the heater that is inside. After 30 s or so you should be able to feel some warmth on the outside of the manifold. Now try to start. It should fire right up. If no heat its probably the relay. You might try manually making the + connection temporarily for starting with a good clip lead [45 Amps] running straight from the + supply at the heater relay, then over to the + elec input stud on the heater. You should see a spark as you make the connection.
    larry
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

  10. #10
    Bronze Member
    Join Date
    Apr 2008
    Posts
    87
    Tractor
    Mahinda 7520

    Default Re: 7520 preheater not working, EMERGENCY!

    Ok, preheater is definitely not working. I jumped from the positive battery terminal to the heater with a jumper cable, and after about 15 secs I could feel the warmth. Of course, before it wasn't getting warm at all. Also, the coil light on my dash was lit while I had the jumper in place. Correct me if I'm wrong, but that sounds like the relay to me.

    It still chugged a little bit to start, but it started. I live in Virginia, and I'm not opposed to getting a block heater, but it seems like overkill. It just doesn't get that cold here. My dodge/cummins never has trouble. Do you think a block heater is necessary?

    And next, the age old question, how much does it cost??

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