4000 with SOS problem

[GeorgeBest]

I bought a 1967 4000 last year and this spring the SOS trans started acting up. First thing I noticed was that I'd start the tractor up and at first it wouldn't want to back up. The tractor would just slowly creep forward even when R1 or R2 was selected. After awhile it would then start working. More recently was taking even longer before the transmission would work.
Here's what I've done. I got a 5 gallon bucket of fresh oil and picked up a 309735 filter for the transmission. I'm planning on changing the oil and cleaning the pickup screen and replacing the filter.

Would be nice if that is all it takes, but what do I do next if the SOS is still not working correctly? Are pressure guages the next step or can a person try adjusting the bands without having a pressure guage?

 

[souNdguy]

Get the gauges.. doctors don't do surgery with blindfolds on..

soundguy

 

[NWMO 901 SOS]

(quoted from post at 09:41:03 04/10/08) I bought a 1967 4000 last year and this spring the SOS trans started acting up. First thing I noticed was that I'd start the tractor up and at first it wouldn't want to back up. The tractor would just slowly creep forward even when R1 or R2 was selected. After awhile it would then start working. More recently was taking even longer before the transmission would work.
Here's what I've done. I got a 5 gallon bucket of fresh oil and picked up a 309735 filter for the transmission. I'm planning on changing the oil and cleaning the pickup screen and replacing the filter.

Would be nice if that is all it takes, but what do I do next if the SOS is still not working correctly? Are pressure guages the next step or can a person try adjusting the bands without having a pressure guage?

George,

I adjusted the bands on my 971 a couple of months ago. Just need a light torque wrench and a few standard wrenches or sockets. Guages will help identify the problem [color=red:0cc11c1b39]if you continue to have problems[/color:0cc11c1b39], but for starters, you're on the right path. New fluid (Ford 134 or equiv.), new filter, clean screen and adjust bands. Post back and let us know how it goes. I'm assuming you have the appropriate manual to explain band adjustment procedure??

Chris

 

[Larry NCKS]

I'm guessing you're looking at sticking valves, but try what you propose and get back to us as has been suggested.