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  1. #1
    Member
    Join Date
    Aug 2012
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    27
    Location
    Fort Collins, Colorado
    Tractor
    John Deere 750

    Default JD 750 excessive exhaust and power loss

    My JD 750 4 wheel drive tractor has started putting out more exhaust than normal and seems to have lost some power. Any guidance will be greatly appreciated.

    Thanks,

  2. #2
    Platinum Member
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    Nov 2012
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    766
    Location
    mansfield,Il
    Tractor
    john deere

    Default Re: JD 750 excessive exhaust and power loss

    Depends on what ( more exhaust ) is. If it is white , it's unburned fuel . If it's blue , it's oil .If it's black , it's excess fuel . Might be air filter . Might be rings . M ight be an injector or the injector pump. Have you got decent dealer or mechanic in your area ?

  3. #3
    Gold Member pedalstomper78's Avatar
    Join Date
    Aug 2010
    Posts
    449
    Location
    Ohio
    Tractor
    Case/IH DX33

    Default Re: JD 750 excessive exhaust and power loss

    Let's start with the color of the smoke and start to do some diagnostics from there. One step at a time with no assumptions is what we need to do. Smoke usualy gives a clue as to where the fire is.

    Does it do it all of the time or only under a heavy load?
    Any fluid levels going down?
    Check your collant, oil, etc. If they are down a touch, it's not a reason to panic yet....especially if it's been a while since you've checked any of them.
    The forums are a great place to find information....but also a great place to find speculation. Only you can determine the real problems with your tractor. We're here to help you find the correct way to do it.

  4. #4
    Super Member Gary Fowler's Avatar
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    Jun 2008
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    6,519
    Location
    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: JD 750 excessive exhaust and power loss

    My first thought would be a dirty air cleaner. Pull that and clean or replace if you havent done so in a while and see if that helps.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp CC AC/DC welding machine and all the tools needed to keep them all repaired and running.

  5. #5
    New Member
    Join Date
    Mar 2012
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    1
    Location
    Mossyrock, WA.
    Tractor
    John Deere

    Default Re: JD 750 excessive exhaust and power loss

    We have had 3 tractors come through with serious brake linkage problems. Found all of them with Brake pedals frozen down due to cross shaft rusted and RH pedal mount on shaft also frozen to the cross shaft. All the units came in with the same problem of loss of power, and serious smoke problems. Freed them up and solved all!
    JD 750 excessive exhaust and power loss-mp2799_________un01jan94.gif

  6. #6
    Member
    Join Date
    Aug 2012
    Posts
    27
    Location
    Fort Collins, Colorado
    Tractor
    John Deere 750

    Default Re: JD 750 excessive exhaust and power loss

    H Folks, sorry it took me so long to reply (business trips). All the fluid levels are ok, but it does need an oil change and transmission fluid change. Air clearner is just a little dirty (I did blow it out just in case. The power loss is noticable anytime I try to make it go faster... The hydraulics fluid lines to the loader are coated black from the exhaust. The exhaust is excessive whenever I drive it, hard to tell if it is excessive at an idle. When I drive it it is not obvious that the exhaust is black, but the smell will give you a headache fast.
    I did work it pretty hard with a rototiller and then I ran out of fuel (my bad). I replaced the fuel filter, but had some difficulty getting all the injector lines to bleed. I also replaced the air cleaner at the same time (it was really dirty after the rototilling). I finally got it started. It is a 3 cylinder engine and have been told by a neighbor that it might be 1 or all three injector or the injector pump.

    I will check out the brakes. I can get on a slight hill and see if it rolls freely.

    Could working the little tractor be the cause of the excess exhaust / power loss? Right now it isn't much use.

    I really appreciate all your guidance. Thanks

  7. #7
    Member
    Join Date
    Aug 2012
    Posts
    27
    Location
    Fort Collins, Colorado
    Tractor
    John Deere 750

    Default Re: JD 750 excessive exhaust and power loss

    I checked the brakes today (suggested in this thread). No problem rolling down a slight incline.

  8. #8
    Elite Member Tx Jim's Avatar
    Join Date
    Jan 2007
    Posts
    3,718
    Location
    Coyote Flats,Tx
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: JD 750 excessive exhaust and power loss

    Since you've changed the fuel & air filters I suggest having the injectors tested and possibly check inj pump timing.

  9. #9
    Platinum Member
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    Nov 2012
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    766
    Location
    mansfield,Il
    Tractor
    john deere

    Default Re: JD 750 excessive exhaust and power loss

    Check the hose from air filter to engine , and make sure it is not collapsing at high throttle . I've seen this happen onturbocharged engines which yours is not , but would have the same effect . Make sure you have those injector lines snugged up also.

  10. #10
    Gold Member SLHawkins's Avatar
    Join Date
    Nov 2007
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    412
    Location
    Northern Virginia
    Tractor
    John Deere 5403, International Harvester 584

    Default Re: JD 750 excessive exhaust and power loss

    If you had trouble getting all the injector lines to bleed, more than like you still got air in the system. Did you fill the filter with fuel before you put it on? My recommendation would be to bleed the lines again. Is it hard to start as well? Check the fuel line from the tank to the injector at the fittings/clamps. I had s yanmar fx32d that was giving me similar problems. Turns out there was a hairline crack in the fuel line right under the clamp at the fuel injector. It doesn't take much. It is sucking in air from somewhere. Make sure all the fuel lines are tight. If they are all tight, check the hose going into the injector. Pull it and squeeze it to see if there are any cracks.

    Hawk
    A lil bit country, and a whole lotta soul, wid a taste of hip hop flava on the side.

    JD 5403, , IH 584, NH 846 Baler, NH 492 Haybine, Woods E320 Batwing Rotary Cutter, Landpride RCR1572 Rotary Cutter, WR Long 72" OBRG, LandPride RB3596 Landscape Blade, '74 Diamond Reo Dump Truck; '70 F880, '94 Freightliner Classic, KNC 10 tooth Chisel Plow, New Holland Manure Spreader, 35' Texas Bragg Flatbed Gooseneck, Case 450 Track Loader, H-90CM Wheel Loader, '69 Kaiser Jeep M52A2 6x6

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