4020 park problem

Anonymous-0

Well-known Member
working on early 4020 syncro range. when put in park the tractor will coast and you can hear the transmission stripping. I took off platform and top trans cover. when put in park the front shift collar you can see moves back and fourth when rocking the tractor. the teeth that the collar slides over on the gear look good. they still come to a point on the end and are not rounded. the little spring is on the shift cam. it looks like the front shift collar does not go on to the front gear far enough all the time. but when you keep rocking the tractor eventually it will go on farther and lock in park.im thinking that the collar isn't always sliding on the front gear far enough for some reason.the rear shift collar slides on all the way and locks fine. what else should I be looking for? thanks for any help. joe.
 
Sounds as if someone put trans in park while tractor was still rolling and rounded of some teeth(sycronizers). Or trans shifter needs adjusting/slack removed
 
Can you see when the front collar is not all the way engaged is the spring on the shift cam holding the roller tight to the cam. I have seen the spring get weak and not hold the roller tight enough and cause what you are describing. I think I have removed the cam to replace the spring on a 4020 without splitting the tractor. It's tedious but it can be done.
 

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