Ford 640 jumps out of 1st gear

RufusMons · Oct 1, 2019

My Ford 640 with a four-speed transmission jumps out of first gear when going down hill. What's the likely cause?

5azzmonkey · Oct 3, 2019

(quoted from post at 17:02:30 10/01/19) My Ford 640 with a four-speed transmission jumps out of first gear when going down hill. What's the likely cause?

I'm by far a transmission expert but it appears (to me) that part #48 'spring' and #49 'ball bearing' push into the detent on part #47 'rod' which in turn locks the shift lever. I'd open the cover and have a look. If this were a 650 (5-speed) I'd say check for a worn plunger .........

Hopefully someone else with more experience can chime in.

-Dave

Hobo,NC · Oct 3, 2019

Make sure the end of your shifter is in good condition.
Check first gear the big'N at the rear of trans if its sloppy on the shaft it could also be an issue.

As far as a shift fork issue its had to tell without a good one to match it up to you would need it out to match it again a good one, if you had a experienced eye its possible to see how it matches up... you can drive the shift rail forward and remove the shift fork..

BTW the ball for the detent is 3/8" all used on those tractors are 3/8"...

A look at whats spose to look like when all's well...

https://fordtractorcollectors.com/4-speed-transmission-locked-up-stuck-in-two-gears/

Ford 640 jumps out of 1st gear

RufusMons

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5azzmonkey

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Hobo,NC

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