Later model 4020 alternator discovery
Results 1 to 8 of 8
Like Tree19Likes
  • 5 Post By wrgarrett
  • 3 Post By Tx Jim
  • 2 Post By CADplans
  • 2 Post By Crracer712
  • 3 Post By Tx Jim
  • 3 Post By Crracer712
  • 1 Post By DRobinson

Thread: Later model 4020 alternator discovery

  1. Top | #1

    Join Date
    Sep 2019
    Last Online
    09-19-2019 @ 05:46 PM
    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Later model 4020 alternator discovery

    First off, I am NOT a tractor mechanic. I have worked on cars, trucks, over the road trucks, Jeeps, motorcycles and stationary engines all my life. I guess I have let tractors intimidate me to the point that I basically go brain dead when I am confronted with an issue on my old 4020. I'm getting better though.

    Not a question, but a discovery I just made. Later model, 1970 4020 SN 227*** alternator went out. I looked at the alternator and the only tag or marking on it was a John Deere rebuild sticker. Asked around and was told it was a Motorola. I didn't know different so I set about looking for one. Ordered one and when it arrived, it was nothing like mine. Sent it back. Called John Deere dealer and was told $242.00 + $70.00 core since mine had a cracked case. Not so fast! I drove Oldsmobile cars from the '70s through the early '90s. I started thinking, that alternator sure looked a lot like ones I had replaced on my Olds through the years. Looked on Amazon, saw AC Delco Professional line factory re-mans with 2 yr warranty, free shipping, $37.25, no core charge, $7.00 coupon, final cost $30.25. This is alternator is sold by AC Delco through Amazon. Fits perfect. Works perfect. AC Delco part number 334-2114. Look it up on Amazon or AC Delco.

    By the way, John Deere would only warrant theirs for 6 months if I installed it, 1 year if a mechanic installed it.

    This adventure was definitely a confidence builder. I now have a technical manual for it and read it every spare moment I have.
    Attached Thumbnails Attached Thumbnails ACDelco 334-2114 Professional Alternator, Remanufactured Automotive Front View.png ACDelco 334-2114 Professional Alternator, Remanufactured Automotive Rear View.png

  2. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  3. Top | #2

    Join Date
    Oct 2014
    Last Online
    Today @ 11:48 AM
    Location
    Coyote Flats,Texas
    Posts
    1,727
    Thanks
    15
    Thanked 296 Times in 266 Posts
    I think Motorola alt are over rated. I'd choose a Delco alt any day over a Motorola.
    DRobinson, BigJim55 and Herminator like this.

  4. Top | #3

    Join Date
    Jul 2015
    Last Online
    Today @ 02:31 PM
    Location
    Near Roa. VA
    Posts
    3,612
    Thanks
    43
    Thanked 440 Times in 340 Posts
    Is that the infamous "one-wire" alternator?
    BigJim55 and Herminator like this.
    Some of the tractors include JD 4105, JD 855, JD 650,,,, and,,, the IH 584 4WD
    My favorite attachment is the homemade landplane,,, EVERYONE needs one of those!!

  5. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

  6. Top | #4
    Crracer712's Avatar
    Join Date
    Aug 2019
    Last Online
    Today @ 03:19 PM
    Location
    SE Kansas
    Posts
    19
    Thanks
    0
    Thanked 2 Times in 2 Posts
    I've only seen AC Delco alternators on these old tractors. Never a motorcraft. Not saying they never used them, just ain't seen any.

    What's the amp output on the alternator you bought and do you have any idea the RPM in which it starts it output?
    BigJim55 and Herminator like this.

  7. Top | #5

    Join Date
    Oct 2014
    Last Online
    Today @ 11:48 AM
    Location
    Coyote Flats,Texas
    Posts
    1,727
    Thanks
    15
    Thanked 296 Times in 266 Posts
    Quote Originally Posted by Crracer712 View Post
    I've only seen AC Delco alternators on these old tractors. Never a motorcraft. Not saying they never used them, just ain't seen any.
    Here's a parts schematic for Motorola not Motorcraft alternator for 4020 sn >201,000. You can rest assured some JD tractors & SP equipment utilized Motorola alternators from the factory
    Attached Thumbnails Attached Thumbnails Annotation 2019-09-20 151422.png
    Last edited by Tx Jim; 09-20-2019 at 03:22 PM.
    DRobinson, BigJim55 and Herminator like this.

  8. Top | #6
    Crracer712's Avatar
    Join Date
    Aug 2019
    Last Online
    Today @ 03:19 PM
    Location
    SE Kansas
    Posts
    19
    Thanks
    0
    Thanked 2 Times in 2 Posts
    Oops. I did read Motorola, but thinking about AC Delco made me think I read motorcraft...
    Zebrafive, BigJim55 and Herminator like this.

  9. Top | #7
    BigJim55's Avatar
    Join Date
    Nov 2013
    Last Online
    Today @ 08:53 AM
    Location
    Schellsburg, PA
    Posts
    11,216
    Thanks
    3,034
    Thanked 1,393 Times in 1,094 Posts
    Quote Originally Posted by CADplans View Post
    Is that the infamous "one-wire" alternator?
    looks like it to mei still have a generator on my model jd 50. and with a delco-remmeny distributor on it-i can buy a set of points and can't think of the thumping little round thing inside the cap now.

    way-way cheaper than at deere--and works the same too.
    jim

    2006 2520 mcut, 2004 x475, 1953 model 50, 1985 318-was my Dad's,
    king kutter tiller-60", frontier-stone rake, jd-4ft brush hog, frontier-6ft back-blade, frontier-forks, 48 inch forks,
    2-54inch jd snow plows, jd-5ft-pull brush hog,

    2018 835R gas model gator-"aka" the Cadillac i say!! 6ft jd snow plow-which already has a dtac out on it. i got just about everything on it i could at the time

  10. Top | #8
    DRobinson's Avatar
    Join Date
    Jan 2011
    Last Online
    Today @ 03:30 PM
    Location
    Northeastern PA
    Posts
    10,608
    Thanks
    2,114
    Thanked 2,312 Times in 1,435 Posts
    Quote Originally Posted by BigJim55 View Post
    looks like it to mei still have a generator on my model jd 50. and with a delco-remmeny distributor on it-i can buy a set of points and can't think of the thumping little round thing inside the cap now.

    way-way cheaper than at deere--and works the same too.
    Condensor or rotor, Jim? Both are thumping little round things inside the cap.
    Zebrafive likes this.
    Don

    2320, 54D MMM, 200CX FEL, 54 Front Blade with Artillian Extensions, Omni Transformer Hitch
    445, 54 mower and 54 front blade
    80 dump cart, 21 walk behind mower

  11. Remove Advertisements
    GreenTractorTalk.com
    Advertisements
     

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts