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850 Not Disengaging Drive Shaft


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#1 TimW OFFLINE  

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Posted September 26, 2014 - 09:53 PM

I started into an older 850 I had looked at for way too long.  The previous owner told me it only grinded when he tried to put it in gear. I  rebuilt the carb, then replaced the blown head gasket, runs great.  But, even though the clutch is disengaging, the drive shaft will stay turning, not allowing you to go into gear, unless I start it in gear.  Can the pilot bushings on these seize up and lock the flywheel  to the drive shaft?  If not, any ideas on what else may cause this.  The clutch plate itself is definitely disengaging and separating by at least and 1/8th of an inch.  I do see a shiny looking sleeve or shaft when I look into the gap. Thanks in advance.

 

Tim


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#2 EricFromPa OFFLINE  

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Posted September 26, 2014 - 10:52 PM

There are 2 Clutch Disks on the 850.Sounds like its seized on the front disk.Can you take a Pic of your clutch from under the tractor?

 

Here's a pic of one from a couple years ago that had seized because of severely worn clutch material.They tend to stick together when it's metal to metal.

 

 

 

sqgl1t.jpg

 

dia.jpg


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#3 framesteer OFFLINE  

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Posted September 26, 2014 - 11:18 PM

Could also be that the bearing in the lower pulley is seized to the drive shaft.

 

Could also be that the brake on the drive shaft is worn or needs adjustment to stop the drive shaft.


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#4 MyBolens1053 OFFLINE  

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Posted September 26, 2014 - 11:42 PM

I had the very same problem with my 850 when I bought it from a guy. Found the front part of the pulley had stuck to the clutch material, not allowing it to disengage. Some slight prying and a brass mallet finally freed it up.


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#5 OldBuzzard ONLINE  

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Posted September 27, 2014 - 06:23 AM

Like framesteer said, I'm betting that it's the brake on the drive shaft.

 

It either needs adjusted or a new pad.

 

That's not uncommon, and an easy fix.


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#6 Bolens 1000 OFFLINE  

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Posted September 27, 2014 - 07:00 AM

If the clutch is not froze up its most likely your Brake needs adjustment or replacement.

Since you say you can start it fine in gear it sounds like a brake issue.

I have them in stock if needed.


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#7 TimW OFFLINE  

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Posted September 27, 2014 - 09:00 AM

I may not be thinking right, but if I drive it around, and while under load, push in the clutch, if it still pulls, would that rule out the brake?


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#8 Bolens 1000 OFFLINE  

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Posted September 27, 2014 - 09:05 AM

I may not be thinking right, but if I drive it around, and while under load, push in the clutch, if it still pulls, would that rule out the brake?

 

If your driving around and push in the clutch it should stop , even if the brake is completely worn it still should stop if the clutch is pressed all the way down.


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#9 TimW OFFLINE  

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Posted September 27, 2014 - 09:54 AM

I was thinking that if the clutch plates were seized, then it would not stop with the clutch/brake pedal depressed, but if the brake was the problem, the load should stop the drive shaft.  What ever the case, depressing my clutch in under load does not even effect the forward movement.  Knowing there are two clutch plates changes my mind on what I was seeing.  


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#10 OldBuzzard ONLINE  

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Posted September 27, 2014 - 04:58 PM

If it's still moving when you push in the clutch, then it's the clutch plates.


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#11 TimW OFFLINE  

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Posted September 29, 2014 - 12:51 PM

That was simple.  I got underneath it ready for the long haul.  I took a can of brake parts cleaner and a thin bladed putty knife, sprayed a little, gently put the putty knife in the crack, and it popped right loose.  It was the front disc stuck to the pulley.  Who would have thunk these had two discs, much appreciation for pointing that out.  It would be so easy to see the rear disc moving free and assume that was not the issue, or at least to my simple mind.


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#12 Bolens 1000 OFFLINE  

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Posted September 29, 2014 - 03:15 PM

Glad you got it solved, its actually quite common to have that happen on ones that have been sitting for an extended amount of time. When planning for long storage my grandfather would often place a block of wood on the clutch petal so the discs remained free.


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#13 Kfs35 OFFLINE  

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Posted September 29, 2014 - 07:47 PM

Mine froze over the summer. It is now sitting with a block of wood holding the pedal depressed like Dr Bolens said.
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