Archived

This topic is now archived and is closed to further replies.

Ted(MD)

1086 Clutch Adjustment

16 posts in this topic

I have read the forums before but never posted so here goes.

I was hoping to get some help on a 1086 we just bought. Using an IT manual I was going through making sure the clutch and T/A were adjusted properly. I first did the adjustments on the clutch booster, then the clutch free pedal adjustment then the dump valve and last the transmission brake. I adjusted everything to spec as shown in the IT book, that is 1 and 1/8 inch free travel on the clutch and 1 and 1/8 inch between the snap ring and the dump valve body for the t/A. The T/A seems to engage well - snaps right in with positive action. The clutch though is not very smooth. As you release it, it starts to engage and the tractor moves and then suddenly engages fully as you release the clutch. It is not a smooth steady engagement as I would hope it could be. It does not slip but makes a slight whining noise (not very loud) for a second or two after the clutch engages

Does anyone have any suggestions or advice. I have never worked on one like this before and I know these tractors don't have a reputation as a smooth shifting machine but I am hoping that there is a way that the clutch can be a little smoother.

Thanks in Advance,

Ted

Share this post


Link to post
Share on other sites

Try your clutch first with the TA ahead, then with the TA back. If it works better with the TA back,

you may need to re-adjust the TA dump valve.

Unhook the transmission brake completely, then try your clutch. If it engages better, you may need to tweak

the brake adjustment.

Try the clutch at different RPMs and report back.

Share this post


Link to post
Share on other sites

I had a 1086 at one time that was real touchy when engaging the clutch. The fix was a small bracket that bolted between the cab and the clutch pivot linkage. It seemed the cab flex made for erratic clutch engagement. I have no idea if the brackets are available anymore, but I bet you could find one in a salvage yard. Our dealer put one on our 886 when it was new even though it never seemed to be as big a problem on that tractor. Hope this helps.

Share this post


Link to post
Share on other sites
I had a 1086 at one time that was real touchy when engaging the clutch. The fix was a small bracket that bolted between the cab and the clutch pivot linkage. It seemed the cab flex made for erratic clutch engagement. I have no idea if the brackets are available anymore, but I bet you could find one in a salvage yard. Our dealer put one on our 886 when it was new even though it never seemed to be as big a problem on that tractor. Hope this helps.

The clutch pivot update kit is still available.

Share this post


Link to post
Share on other sites

Thanks for the ideas

I did try it with the transmission brake disconected and it made no differance. I will see if I can notice any differance with the TA in low. I also looked up the clutch pivot update. I think I found it as part number 77744C91 in the online parts book as a package called the "clutch lever pivot bracket." It doesn't show a picture of that package so I am not sure what it looks like. I have a red stripe model. Would that already have this update?

Share this post


Link to post
Share on other sites

Congrats on buying a 1086!! You have one of the best pulling, and easiest to work on tractors ever built. Nothing runs quite as nice as a DT 414!! :D I'll throw my 2 cents in here, since I am the usual "go to guy' on '86 series tractors. :blush:

First thing that I do is disregard everything that's written in the service manuals.... :P Not that they're wrong, but when they are set up right they shift nice up and down through the gears if you "think before you shift" hehe.

Check that when the TA is forward in Direct Drive position that the snap ring is bottomed out on the spool- this is VERY important!

First thing to do is to set up the clutch with extra free play. This is usually to your own liking, but I set them up so that the tractor starts to move when the heel of your boot is still on the floor. This makes it easier to feather the clutch for hitching equipment or moving a few feet in the lineup at at the elevator. Don't make any adjustments on the booster, only on the turnbuckle going on down to the clutch release shaft (which requires a 9/16" wrench to loosen the locking block and a large flat screwdriver to turn the adjusting screw). Once you have this adjustment where it is comfortable, make sure that the lube oil tellite is operating on the dash. It should come on when the clutch is pushed all the way down. Adjust the linkage so that when in High range, 3rd gear the light should go out before the tractor starts to move as you slowly let the clutch out. Now adjust the transmission brake. Run the tractor at idle speed while the speed transmission is in 3'rd gear. Push on the clutch and count 1-2-3- and try to slowly shift to high range. It should go in nicely with only a "clunk" from the gears. Try to adjust this accordingly. Remember to break loose the jamb nut before removing the locking pin.... they sometimes require a little persuasion.

I have been setting them up this way for quite some time (and follow the order) and it has worked well. Remember to lube all of the shift linkages on top of the transmission from time to time, and you will have a super nice useable tractor.

Best regards,

Darryn B)

Share this post


Link to post
Share on other sites

Thanks for the help guys.

I worked on it for a while today. I musted have climbed into the cab 100 times after making an adjustment only to get off 30 seconds later and do some more adjusting. I still do not have it right. The clutch will release just fine with the T/A engaged but in direct drive as I release the clutch it starts moving then at almost the end of the clutch travel it will grab again and speed up. I can adjust the dump valve so that it works correctly in direct but then the T/A doesn't work. I have the T/A set with the snap ring all the way down on the valve body when in direct and the trans brake set to allowing shifting after 3 seconds when moving from neutral.

Is this something I can correct by adjusting the dump valve or do you have any more suggestions as to what my problem is. I feel like I am just missing something in the adjustment process.

Thanks for the all the help

Share this post


Link to post
Share on other sites

Hi, Ted. make sure that the linkage is operating smoothly on the dump valve. I have seen where all adjustments are in tune, but the hinge point on the dump valve yoke was binding (or full of dried lube or other "crap") causing it to move slowly. Move it by hand and see that it returns freely. Is your dash "lube" tellite working?

Darryn B)

Share this post


Link to post
Share on other sites

Darryn

I will check the valve action. The valve does appear to be leaking. The light works but does not go out until after the tractor is already moving.

Ted

Share this post


Link to post
Share on other sites
Darryn

I will check the valve action. The valve does appear to be leaking. The light works but does not go out until after the tractor is already moving.

Ted

There's your problem, the light must go out before the tractor starts to move.

The 3/8" measurement they give for the dump valve is not as important as having the lube light go off before clutch engagement.

Jim N.

Share this post


Link to post
Share on other sites

Darryn

I will check the valve action. The valve does appear to be leaking. The light works but does not go out until after the tractor is already moving.

Ted

There's your problem, uhe light must go out before the tractor starts to move.

The 3/8" measurement they give for the dump valve is not as important as having the lube light go off before clutch engagement.

Jim N.

So should I keep adjusting the dump valve until the light goes out first? Is there a secret to getting it adjusted correctly?

Ted

Share this post


Link to post
Share on other sites

Darryn

I will check the valve action. The valve does appear to be leaking. The light works but does not go out until after the tractor is already moving.

Ted

There's your problem, the light must go out before the tractor starts to move.

The 3/8" measurement they give for the dump valve is not as important as having the lube light go off before clutch engagement.

Jim N.

So should I keep adjusting the dump valve until the light goes out first? Is there a secret to getting it adjusted correctly?

Ted

Yes, the light must go out before the clutch engages.

Share this post


Link to post
Share on other sites

The dump valve "dumps" att the pressure in the TA for easier shifting when you step on the clutch. That's why when it's not adjusted properly it stays in TA mode as you are letting the clutch out and after it starts moving. Back that sucker off so that it goes out before you are moving. It doesn't have to be precise, but the light MUST come on when the clutch is down, and go out BEFORE you get rolling.

Darryn B)

Share this post


Link to post
Share on other sites

Jim and Darryn,

First off, thanks for the help. Secondly, it is still not working right.

Let me explain exactly what I did with it. First I disconected the trans brake, then set the clutch free travel. Next, I checked to make sure the snap ring was down on the valve body for the T/A when in direct drive. Then, I backed the dump valve off to where the adjusting rod barely had any tension on it. I would then try running the tractor and then tightning up the nut on the the on the dump valve adjustment rod a turn or so at a time. When I started (tractor in direct drive) and the clutch was pushed in the light would would come on and as I released the clutch the tractor would start moving, as I continued to release the clutch the light would go out then the tractor would jump and speed up as the clutch was fully released. I continued tightning the rod slowly until finally the light would stay on all the time and the T/A would not work but the clutch would engage smoothly at that point. I then tried backing off the tightner slowly but I could not find a sweet spot where the clutch engaged smoothly in direct and the T/A worked.

The dump valve is leaking a steady drip (this will need to be fixed regardless)- could this be my problem? Let me know if there is anything I am missing.

Ted

Share this post


Link to post
Share on other sites
Jim and Darryn,

First off, thanks for the help. Secondly, it is still not working right.

Let me explain exactly what I did with it. First I disconected the trans brake, then set the clutch free travel. Next, I checked to make sure the snap ring was down on the valve body for the T/A when in direct drive. Then, I backed the dump valve off to where the adjusting rod barely had any tension on it. I would then try running the tractor and then tightning up the nut on the the on the dump valve adjustment rod a turn or so at a time. When I started (tractor in direct drive) and the clutch was pushed in the light would would come on and as I released the clutch the tractor would start moving, as I continued to release the clutch the light would go out then the tractor would jump and speed up as the clutch was fully released. I continued tightning the rod slowly until finally the light would stay on all the time and the T/A would not work but the clutch would engage smoothly at that point. I then tried backing off the tightner slowly but I could not find a sweet spot where the clutch engaged smoothly in direct and the T/A worked.

The dump valve is leaking a steady drip (this will need to be fixed regardless)- could this be my problem? Let me know if there is anything I am missing.

Ted

Ted,

The leak is not the source of your problem.

Try it this way....Loosen the dump valve rod until the light does not come on when the clutch is all the way down.

Then, tighten the dump valve rod until the light comes on then go a little more with the adjusting nut. 2-3 rounds with the nut.

Your goal is to get the light to go out just before the tractor starts to move.

Jim N.

Share this post


Link to post
Share on other sites

Jim and Darryn,

First off, thanks for the help. Secondly, it is still not working right.

Let me explain exactly what I did with it. First I disconected the trans brake, then set the clutch free travel. Next, I checked to make sure the snap ring was down on the valve body for the T/A when in direct drive. Then, I backed the dump valve off to where the adjusting rod barely had any tension on it. I would then try running the tractor and then tightning up the nut on the the on the dump valve adjustment rod a turn or so at a time. When I started (tractor in direct drive) and the clutch was pushed in the light would would come on and as I released the clutch the tractor would start moving, as I continued to release the clutch the light would go out then the tractor would jump and speed up as the clutch was fully released. I continued tightning the rod slowly until finally the light would stay on all the time and the T/A would not work but the clutch would engage smoothly at that point. I then tried backing off the tightner slowly but I could not find a sweet spot where the clutch engaged smoothly in direct and the T/A worked.

The dump valve is leaking a steady drip (this will need to be fixed regardless)- could this be my problem? Let me know if there is anything I am missing.

Ted

Ted,

The leak is not the source of your problem.

Try it this way....Loosen the dump valve rod until the light does not come on when the clutch is all the way down.

Then, tighten the dump valve rod until the light comes on then go a little more with the adjusting nut. 2-3 rounds with the nut.

Your goal is to get the light to go out just before the tractor starts to move.

Jim N.

Success! It is working perfectly - light goes out, tractor starts moving, smooth engagement. I loosened the rod up all the way just as you suggested above and worked from the other direction. The advice you guys gave me all along was right but I was looking at it the wrong way. I appreciate you sticking with me on it.

Ted

Share this post


Link to post
Share on other sites