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Thanks for the follow up posts, Hope the mice didn't chew through any of the wires!
OK!!!!!!!!!!!Here's the fix!!! I solved my problem:
PROBLEM:
1)Plenty of fuel
2)Engine freely cranks over and fast as usual
3)Couldn't find the bloody chicklet transmistor after buying two of them (one for a spare) so they are in my parts cabinet now.

But still no start.

SOLUTION:
1)Take the right engine cover off.

2)Unbolt the rear bracket/cover plate from the engine.
(Two top bolts and one larger lower bolt)After unbolting, twist a little to pull away and up so that you can get to the selonoid.

3)With a small 1/4" socket set, remove the two bolts holding the selonoid to the rear of the injector pump. Remove the selonoid from the injector, unplug from wiring harnass.

4)If you see oil running out of the selonoid, your half way there. Take it in the shop, get a can of Brakeleen or Brake cleaner. (It cleans and evaporites fast) Turn the selonoid cannister up, plunger downward and work in in and out spraying Brakeleen up in where the plunger goes in the canister. Do this several times until the plunger feels free of oil.

5) Now, re-install, make sure you put the o-ring back in between the selonoid and the injector pump upon installing.

6)Put the side cover bracket back on, start your tractor!
IN especially cold weather, the oil "hardens" or gets "stiffer" creating a blockage so that the plunger can not move all the way as it should. It should be a obvious clank, not a lite click sound when you turn the ignition on. After this manuver, you will hear a louder clank when you activate the switch at the panel. Good LUCK!, mine started right up after doing this maintenance. Reggie

4200 Will Crank but won t start
John Deere Tractors
Replies 6 Post by SouthernMD