1984 jd 640 transmission problem

[Branson1822]

OK finally got around to testing on first gear forward. It only had 21 pounds second gear forward was zero that’s C one seventh gear zero first gear reverse 0 second gear reverse zero but if you’d rev them up, you’d get up about 40 pounds and I only tested C1 on them didn’t figure I need to go any further seeings how I’m not getting anything, what do you think it is?

 

[Diesel Dave]

Not sure if you are able to physically reach the transmission clutch valve.
There is a test port marked “ CLUTCH “. The port is regulated pressure after the transmission pump. 175-185 psi.…
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View attachment 306469

I would do what ever it takes to check the pressure at the “clutch“ port shown on the clutch valve. The clutch valve controls the pressure at C1 and C2.
Check the pressure with the pedal up ,neutral or any gear.
Should be 175-185 at the clutch port at approx 1900 rpm.

 

[Branson1822]

It is at 5 pounds if you, Revit 50 that’s in gear and clutch out clutch in is zero

 

[Branson1822]

That wasn’t fun to get to

 

[Diesel Dave]

Any blade and or steering function performance issues ?

 

[Branson1822]

No it all works winch works also

 

[Diesel Dave]

Sounds like the transmission pump is ok if the blade ,steering and winch operate normally .
Remove and check the condition of the pressure regulator spring #22 in the transmission pressure regulating valve housing. see screenshot below.
Also check that the valve moves freely.
.

 

[Branson1822]

The that where I checked the clutch pressure and do I have to remove it to get to the spring

 

[Branson1822]

Also is there anywhere else I should look besides there

 

[Diesel Dave]

The pressure regulator valve housing is below the clutch (inching) valve.
If the regulator spring and valve proves ok , double check that the clutch (inching) pedal is returning all the way to the top of the stroke.
If the pedal and linkage look ok , I think the next step would be to remove and inspect the internals of the clutch (inching) valve.

 

[Branson1822]

Ok thank you I will let you know I sure do appreciate it

 

[Branson1822]

I took out the spring in the valve spring was good valve moves good. Everything looked good in that little spot. The pedal is doing what it’s supposed to do also

 

[Diesel Dave]

I know I suggested this in my first post but….double and triple check for a solid connection between the valve operating arm and the shaft on the clutch (inching) valve. Check with a mirror if need be.
Screenshot below.
If everything proves ok , at this point I think next step would be to remove and inspect the internals of the clutch ( inching) valve.
.

 

[Branson1822]

Ok I’ll check it again to be sure if it’s good am I just checking the springs and passages in the valve

 

[Branson1822]

I also checked the pressure again just to be sure and it was getting about 70 pounds

 

[Diesel Dave]

Ok I’ll check it again to be sure if it’s good am I just checking the springs and passages in the valve

Yes, see screenshot below.
https://partscatalog.deere.com/jdrc/sidebyside/equipment/66805/referrer/navigation/pgId/5959 .
.

 

[Branson1822]

Ok thank you and I will let you know what I fine. I hope I find something thing is driving me crazy and I need it on the job site

 

[Diesel Dave]

Ok thank you and I will let you know what I fine. I hope I find something thing is driving me crazy and I need it on the job site

Sucks to have a machine down with absolutely no warning.
FYI, the free length of springs , +/- .03 inch .
R33173 2.0 inches .
R33174 1.3 inches .
R33175 .5 inch .

 

[Branson1822]

Ok thank you the one I took out today was much longer than that is that correct

 

[Diesel Dave]

Spring # T60314 free length is 5.61 inches .
https://partscatalog.deere.com/jdrc/sidebyside/equipment/66805/referrer/navigation/pgId/5732 .
.