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656 shifting problem

D

Don656

Member
I have a 656 farmall standard shift. I use it for plowing, working ground, and planting 17 acres. While planting this year, a dowel pin fell out of the upper cross shaft (the shaft that the gear shift lever moves to shift gears) which made it incapable of shifting gears. I have disassembled the gear shift lever and this shaft. I can put it all back together, but it seems like the dowel pin could fall back out again. There doesn"t appear to be any wear on the dowel pin, but it is a slip fit in the shaft. Does anyone know if this pin is supposed to fit loose in the shaft or is it supposed to be a press fit or should it be lock-tited in? The service manual mentions driving this pin out for disassembly, but on my tractor is just slips out. Does anyone know how to keep this pin from falling out?
 
Yeah, it originally was a snug fit.

When that happened to my tractor, I just used a hard bolt of about the same size and put it in there with the head up so that it couldn't fall thru the hole again.

Allan
 
Yeah, it originally was a snug fit.

When that happened to my tractor, I just used a hard bolt of about the same size and put it in there with the head up so that it couldn't fall thru the hole again.

Allan
 
Allan,

I don"t see how a bolt could work since this pin has to slide thru the upper middle lever (for 2nd & 3rd gear) and the head wouldn"t be able to slide thru. The lever just has a slot for the pin to slide thru. The pin can only drop out when in 4th or 5th gear and when in 1st or reverse. When in 2nd or 3rd gear, the pin is totally trapped inside the lever.
 
Clean it up good ant try Locktite. Not much to lose except time.

The pins coming loose has always been a problem for those tractors. There was a kit available to convert them to the later style with square pins which does help. They also replaced the casting on the outer end so that the shaft can be installed without removing the pins. The old casting can be reworked to accomplish the same thing. The gate assembly the the inner pin goes through was also changed from a one piece assembly to three pieces for easier shifting with the square pin.
 
Thanks Owen!

I"ll try the locktite. The kit you mention is still available from the CaseIH dealer but it is pretty pricey -- $680.
 
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