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John Deere Model 41 Mower 38" Width Belt Adjustment


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#1 desmith1944 OFFLINE  

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Posted May 13, 2014 - 07:13 AM

I purchased the 140 H3 and model 41 mower deck last year.

 

I was looking at the drive belt and there was not enough tension on the belt. The original knob was missing so I purchased one and when I tried turning the new knob it will not budge toward the tightening position. The person who had the mower before me was using the jam nut to tighten the belt. The belt will tighten if you run the jam nut in against the mule drive case.

 

The stud is approx. 4 inches in length with fine thread on the clevis end and course thread on the knob end. I have asked a couple people and they said this is the correct stud.

 

I removed the mule drive to look it over. The stud & clevis look ok and the pivot pulley works ok.

 

I took the mule drive to my local John Deere dealer and the guy said it should work. He could not give me any tips as to why it would not work.

 

Has anyone had this problem before?

 

Thanks, Dave.

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Edited by desmith1944, May 13, 2014 - 10:16 AM.


#2 TomLGT195 OFFLINE  

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Posted May 13, 2014 - 08:54 AM

I'm not much help , but pics would help. Tom

#3 desmith1944 OFFLINE  

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Posted May 13, 2014 - 09:05 AM

Hi TomLGT195, good idea, I will need to take the mule drive back off the tractor. Maybe I can get that done later today.



#4 Trav1s ONLINE  

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Posted May 13, 2014 - 11:12 AM

Sorry I missed this before... 

I am running that set-up on my 120.  It originally came with a 41 that rusted out so I replaced it with the current 41 from a 316K.  I have attached the diagram of the mule drive for the 41/48 decks from JD parts.  Make sure all the parts in the diagram are in your unit.  I will try to get a pic of the drive installed on my 120 for your reference.  Drop me a note if it seems I forget to do this.  Also, are you sure you have the correct belt for your application?  JD parts shows one belt for the 41 decks and one for the 48 decks on Kohler-powered machines:

 

M45998 - (41)  - (120, 140, 300, 312, 314 AND (316 S/N -95000) TRACTORS)

M45254 - (48)  - (120, 140, 300, 312, 314 AND (316 S/N -95000) TRACTORS)

 

A bit of google-foo yields this info about the two belts

 

The specs on M45998 for 41 decks

  • 83.100-inch effective length*
  • 0.560-inch width

 

The specs on M45254 for 48 decks

  • 86.300-inch effective length*
  • 0.560-inch width

 

My guess is that you have a belt for the 48 deck and need the shorter belt for the 41.  

Travis


Edited by Trav1s, May 13, 2014 - 11:24 AM.


#5 desmith1944 OFFLINE  

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Posted May 13, 2014 - 12:20 PM

Hi Trav1s, well I thought about the belt length and as close as I could measure it was approx. 83 inches. I just double the belt and measured not sure if that is the correct way or not.

 

My current problem is weird, when I screw the knob onto the stud and it tightens up that's it. No more turning. If I take a wrench and tighten the jam nut until it reaches the mule drive case then it will start putting tension onto the belt. When I tighten the nut it pulls the stud out from the mule drive case toward the front.

Is that the way it is suppose to work?

 

Thanks, Dave



#6 Trav1s ONLINE  

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Posted May 13, 2014 - 01:58 PM

So we have eliminated one variable. I will get some pics of the drive installed on my 120.

#7 Trav1s ONLINE  

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Posted May 13, 2014 - 03:13 PM

Here are a couple pics of how my 120 looks with the drive and deck installed.

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#8 desmith1944 OFFLINE  

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Posted May 13, 2014 - 03:35 PM

Trav1s, well looks the same here all except the tension indicator rod, mine is not up as far as yours. I have the jam nut all the way tight against the mule drive frame. Not sure if that is a problem or not. I put my new cover on just to see where it was on the indication and it says re-tension. Not close too where it should be. Well I will keep thinking about this problem.
I have a 318 with a 46 inch deck and I ve never had any problems with it. I did notice on the 318 mule drive the stud threads are the same size the complete length.
I mowed today with the 140 and the belt did not come off so it must be tight enough at present time.
Thanks for your sugestions and pics, Dave.

#9 Trav1s ONLINE  

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Posted May 13, 2014 - 03:41 PM

Dave - let me check and see if I can get another pic of the drive from the top.

#10 Trav1s ONLINE  

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Posted May 13, 2014 - 03:49 PM

Dave,

My extra working mule drive is still boxed up from the move.  The only way I can get better pics it to pull the belt and mule.  If that would help I should be able to get pics tomorrow so let me know.

 

Travis 



#11 desmith1944 OFFLINE  

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Posted May 13, 2014 - 05:31 PM

Trav1s, hey don't go to that trouble, I try and get it figured out. Thanks for your input, Dave.

#12 johndeereelfman OFFLINE  

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Posted May 14, 2014 - 12:46 PM

Dave,

 

After looking at your third and fifth pictures, it appears that your mule drive tension spring is broken. Have you checked the spring? If this is the case, then no, you won't have the correct tension needed for the belt adjustment.


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#13 Trav1s ONLINE  

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Posted May 14, 2014 - 01:47 PM

Dave,

 

After looking at your third and fifth pictures, it appears that your mule drive tension spring is broken. Have you checked the spring? If this is the case, then no, you won't have the correct tension needed for the belt adjustment.

 

That makes sense to me and would agree after reviewing the pics again.  

 

It seems I forgot the parts diagram from JDParts several posts ago...

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#14 desmith1944 OFFLINE  

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Posted May 14, 2014 - 07:28 PM

johndeereelfman and Trav1s, I did a search on the Stud M42309 and found it on Ebay and it appears after looking at the photo of the correct stud that I have a stud someone fabricated.

I have the Stud on order. When I looked at the correct stud up close I saw the reason why my knob only turns a couple times then tightens up and will not turn any further. Not nearly enough threads on the clevis end.

I will post again when I get the part.

johndeereelfman, you might be right about the spring. I will take the mule drive off tomorrow and take a closer look.

Thanks again to all for your help and information, Dave.
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#15 desmith1944 OFFLINE  

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Posted May 15, 2014 - 01:48 PM

Thanks for spotting the broken spring fellows. It was broken in two places. Have that on order along with the Stud. Will follow up after parts are replaced. Thanks again, Dave.

Edited by desmith1944, May 15, 2014 - 01:51 PM.

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