8 Speed jerks when letting clutch out.

[Fordiesel69 271]

My B-100, and C-121 have one sweet spot upon letting the clutch out in which the belt grabs.  It does not matter how slow or carful you are, it just lunges forward with a sharp growl.  If it is wet, you will peel out.

 

Both did this with their old belts and also with their new ones.

 

Now all my others tractors are great, very smooth, almost like having a real clutch disc.

[rmaynard 16,287]

Try a genuine Toro belt if you haven't already.

[racinfool40 203]

Also check your drive pulleys for pits or rust...give them a good cleaning.

[Fordiesel69 271]

Drive pulleys are nice and shiny.  The belt is a genuine wheel horse on my B-100, and it did not help.  The C-121 has an aftermarket one becuase I do not have the correct 4" crank pulley, but instead a 5-1/4" hydro pulley.  However it was a fresh one becuase they did not stock it, and had to order it. 

 

Just wondering if there was ever a solution as it has happened to other tractors I have owned.  Never really dug into the problem, it just crossed my mind recently.

[stevasaurus 23,273]

Try a good cleaning of the pulley's grooves with mineral spirits...sometimes that's all it takes.

[dsholler 54]

I used to have mine jerk all the time. Then the clutch spring broke, and needing a new one quickly I just grabbed whatever was down the hardware store that would fit. It had much less tension/resistance than the previous one, and now I can control the clutch pedal much more smoothly. I almost never pop it up, except when I am not paying attention.

 

This does not actually change anything about the mechanism, just allows you to let the clutch out more slowly without requiring you to strain with your foot.

[Fordiesel69 271]

It is not me straining to let off easy.  I have even sanded the pulleys with emery to make them less "glazed" looking.  Still the same.

[decksetter 50]

Check and make sure your foot rest isn't set in too far. My 416-8 had that problem, the clutch pulley nut actually was catching on the back of the belt cover. Loosen the footrest bolts and slide it out a bit and it might solve your problem.

[Fordiesel69 271]

Check and make sure your foot rest isn't set in too far. My 416-8 had that problem, the clutch pulley nut actually was catching on the back of the belt cover. Loosen the footrest bolts and slide it out a bit and it might solve your problem.

 

You might be onto somthing, however I am not understanding what I should be looking for.

[BOWTIE 226]

YOU MIGHT CHECK THE IDLER PULLEY SPINS SMOOTH. I HAD ONE THAT WOULD CATCH AND JERK THE HELL OF YOU. JUST A THOUGHT.

BOWTIE

[brandonozz 168]

Check and make sure your foot rest isn't set in too far. My 416-8 had that problem, the clutch pulley nut actually was catching on the back of the belt cover. Loosen the footrest bolts and slide it out a bit and it might solve your problem.

I had the same problem.  My C165 pulley was rubbing bad enough that I needed to actually pull the clutch pedal with my foot.  When you move the clutch pedal the tension pulley nut can rub on the right side of the belt cover - just inside your right heel.  The foot rest is clamped to a horizontal rod and can slide in toward the frame and rub against the tensioner pulley nut when you push the clutch.  I tryed to move the fender out a 1/4" or so and tighten it up but it kept moving back inward.  I think in reality the tensioner pulley arm was bent outward just a bit so I "tweaked" it inward a bit to deep it from rubbing.

[MaineDad 87]

Could someone have replaced the clutch spring with one of those god-awful air shock things? Do you actually have a spring attached to the transmission that attaches to the clutch?

[Duff 206]

 

Check and make sure your foot rest isn't set in too far. My 416-8 had that problem, the clutch pulley nut actually was catching on the back of the belt cover. Loosen the footrest bolts and slide it out a bit and it might solve your problem.

I had the same problem.  My C165 pulley was rubbing bad enough that I needed to actually pull the clutch pedal with my foot.  When you move the clutch pedal the tension pulley nut can rub on the right side of the belt cover - just inside your right heel.  The foot rest is clamped to a horizontal rod and can slide in toward the frame and rub against the tensioner pulley nut when you push the clutch.  I tryed to move the fender out a 1/4" or so and tighten it up but it kept moving back inward.  I think in reality the tensioner pulley arm was bent outward just a bit so I "tweaked" it inward a bit to deep it from rubbing.

 

I've had the same experience on 312's and I'm with these guys on this one. I ended up having to shim the clamps on my footrests that hold them to the support bars so they wouldn't work their way back inward. The clamps are just stamped metal that with time seem to lose some of their grip. Since I shimmed them with some rubber material to restore their clamping power and increase the friction between the surfaces I've not had any problems or surprises with letting my clutches out!

 

Duff

[decksetter 50]

Check and make sure your foot rest isn't set in too far. My 416-8 had that problem, the clutch pulley nut actually was catching on the back of the belt cover. Loosen the footrest bolts and slide it out a bit and it might solve your problem.

I had the same problem. My C165 pulley was rubbing bad enough that I needed to actually pull the clutch pedal with my foot. When you move the clutch pedal the tension pulley nut can rub on the right side of the belt cover - just inside your right heel. The foot rest is clamped to a horizontal rod and can slide in toward the frame and rub against the tensioner pulley nut when you push the clutch. I tryed to move the fender out a 1/4" or so and tighten it up but it kept moving back inward. I think in reality the tensioner pulley arm was bent outward just a bit so I "tweaked" it inward a bit to deep it from rubbing.

I've had the same experience on 312's and I'm with these guys on this one. I ended up having to shim the clamps on my footrests that hold them to the support bars so they wouldn't work their way back inward. The clamps are just stamped metal that with time seem to lose some of their grip. Since I shimmed them with some rubber material to restore their clamping power and increase the friction between the surfaces I've not had any problems or surprises with letting my clutches out!

Duff

Mine on my 520 were loose so I took them off, laid them on the concrete, and smacked them with a hammer to flatten them back out.

If this is the problem, you should be able to see it from behind the tractor. Look in at the drive belt from behind the right rear tire and you will see the clutch pulley arm. The bolt head sticks out past the pulley. If its rubbing the side panel you should be able to see it.

[Fordiesel69 271]

Well I found the roll pin on the left side bell crank was broken.  I replaced with a small bolt and nut.  The pulley now goes down far enough to stop the belt to make shifting easier.  However it still jerks the same unfortunatly.

 

There is nothing at all binding or rubbing anywhere.  All the linkage and pulleys are free from the guards. 

 

I will not invest in this experiment, but I beleive the pulleys may have a certain wear pattern that cuases this grabbing.  Replacing them and the belt would probably fix it.  Its just a shame the belts last 20 yrs so it will be a long time before I find out..

[gwest_ca-(File Mod) 11,430]

Contrary to what seems logical a stronger return spring helps. It adds more feel to the pedal which results in better foot control. This was something we did to standard transmission autos for new drivers so they could master clutch engagement.

 

Garry

[Fordiesel69 271]

I would be willing to try that.  Will report back in few weeks.

[stevasaurus 23,273]

Seriously, did you try a little Emory cloth and wipe the inside of the pulleys with mineral spirits??  I do not see above where you tried that.

[Fordiesel69 271]

Seriously, did you try a little Emory cloth and wipe the inside of the pulleys with mineral spirits??  I do not see above where you tried that.

 

 

I did this back in 99 or maybe 00 when it had its old belt on it, and I thought that was the problem.  I always sand them to take the glaze off and then I installed a new belt.  It still jerked and made the funny belt squawk.  I forgot my camera, but next time I go down I will put a stiff spring on and take a video.  You will hear and see the problem.

 

I don;t think doing the pulleys again will make any difference. 

[JimD 3,347]

It might be time to replace that 5 1/4" crank pulley with the original 4" pulley. It could be causing this leaping effect you describe.

[Fordiesel69 271]

The C-121 is liveable as the seat is better and the jerk is not painful.  The B-100 is the one I am looking to fix as it hurts the back. 

 

The 5-1/4 pulley is all I could find at the time, and man people want a fist full of cash for them.  Not sure why.