OK this is my first post here so any help would be appreciated. I have a 1984 John Deere 640 and ran perfect no problems shifted fine. Everything was fine finished The job went back a couple weeks later to get the skidder to move to the next job and I have no gears, lost all the gears, it jerks when you put it in gear but no gears i check the filter check the screen checked the fuild level but still nothing. Thanks again for any help.
Welcome to HEF Branson ! Is the clutch disconnect engaged? That would be the lever under your main clutch pedal, IIRC.
No it’s not I pulled motor thinking that something happen there but it is fine
Maybe an issue with the inching pedal linkage (roll pin #1 may have sheared) or sticking internal valve at the transmission clutch valve. https://partscatalog.deere.com/jdrc/sidebyside/equipment/66805/referrer/navigation/pgId/5959 . .
Ok thanks I’ll take a look I just thought it’s weird that is was fine and then all the gears went
can I check the pressure here
Yes. Clutch, brake engagement chart below. .
thank you I’m assuming where it says just for example 1st forward and then it got an X c one and XB one and an XC3 check all three of them separately while in first gear I’m assuming that’s what I’m supposed to do
Also, do you know what the pressures are supposed to be? Thanks again for your help
175-185 psi.
Ok thank you very much
OK, so do I check the two I have circled for pressure or I think there’s four of them on the bottom of it. I’m just getting around to checking.
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.… .
Ok thank you that’s a big help
Last question and I won’t bug you no more shift valve position up down What does that exactly mean? Sorry the transmission thing new to me.
The chart is showing the various shift valve position combinations to direct the pressure oil to the required clutch and or brake packs for the selected gear… . Interested to see the results of the pressure tests.
Yea me to I’ll let you know tomorrow. I didn’t have the right fitting for my gauge
Do I check with brake on or off and clutch in or out
Brake off, clutch pedal out. Under normal operation with the clutch valve in , the pressure is cut off to clutches C1 and C2.
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?
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.
It is at 5 pounds if you, Revit 50 that’s in gear and clutch out clutch in is zero
That wasn’t fun to get to
Any blade and or steering function performance issues ?
No it all works winch works also
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. .
The that where I checked the clutch pressure and do I have to remove it to get to the spring
Also is there anywhere else I should look besides there
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.
Ok thank you I will let you know I sure do appreciate it
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
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. .
Ok I’ll check it again to be sure if it’s good am I just checking the springs and passages in the valve
I also checked the pressure again just to be sure and it was getting about 70 pounds
Yes, see screenshot below. https://partscatalog.deere.com/jdrc/sidebyside/equipment/66805/referrer/navigation/pgId/5959 . .
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 .
Ok thank you the one I took out today was much longer than that is that correct
Spring # T60314 free length is 5.61 inches . https://partscatalog.deere.com/jdrc/sidebyside/equipment/66805/referrer/navigation/pgId/5732 . .
Thats what it was thanks
I pulled the clutch valve off and the valve and spring that works with the clutch pedal seems fine but the one beside it not sure what it’s called. It’s real catchy and slides really hard.
What key # are you referring to ? https://partscatalog.deere.com/jdrc/sidebyside/equipment/66805/referrer/navigation/pgId/5959 . See screenshot shot below. .
The one that the file was pointing at it, slide super rough, and it was hard to get out of there
It just has a single spring on the end of it
I believe number 7 and 8 is it
Are you able to clean everything and free up the sticky valve ?
Is there a casting number on that housing ?
I’ll go look
I couldn’t find any but I took some pictures of both housing for you
This is the clutch
Still clutch
This is the other housing
Just a picture of where it came from
Were you able to free up the sticky valve in the clutch valve ?
I think so well they still be a little grabby since the have the prong on them or should they be smooth
Will
Polish the valve and clean the bore in the housing as best you can . The valve should slide smooth in the bore.
Ok is there anything else there I need to be looking for
What was sticking up the valve ? rust, dirt or something else?
I really didn’t see anything looks like as little wear on a couple valves
I cleaned up everything polished everything everything was put back together and still the same problem
I think you need to flow test the transmission pump. It will be a verification that the pump is capable of producing 180 psi. New pump spec at 1500 rpm is 11.5 GPM (minimum) at 180 psi. Used pump spec at 1500 rpm is 10.5 GPM (minimum) at 180 psi. Deere uses a fancy tool to put in place of the transmission filter element, see below. .
How would you do it without the tool
Not sure.
Ok I’ll see what I can come up with. There’s not really much more that could be wrong is there?
Just need to try and confirm or eliminate the transmission pump as the source of the problem.
Ok will do thanks again
Hey sorry it’s took me so long to get back my mom passed away and we had are little girl and she was in children’s hospital for awhile so not been fun. But the skidder tricked me good over looked the problem many times it ended up being a forward and reverse linkage how I never noticed I’ll never know but thanks for all the help
I’m sorry to hear of your personal issues. Glad you got the skidder up and running.
Thank you for all your hell again
Dave was more than happy to give you grief! Oh, wait, that's not what you meant
Did you ever find out what the problem is? My skidder doing the exact same thing. Same skidder
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