HELP 1991 MTD ruding mower blades always spinning

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  #41  
Old 08-30-15, 07:07 PM
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I will check the deck measurements in the morning. If the deck is out of wack how do i adjust it so front and back are even?
 
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  #42  
Old 08-30-15, 08:05 PM
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Another thing to check - if you look at the pair of pics from the side of the deck, up at the crank pulley you see a fairly long hex bolt, about 1/2 inch diameter and 6 inches long or so. There should be another one of those on the other side of the drive pulley.

I suspect that pair of bolts hold the belt in to keep it from flaring out and dragging on the drive pulley when the deck is disengaged. You have one for sure on the right hand side. See if you have the one on the left side.
 
  #43  
Old 08-31-15, 08:03 AM
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Ok, so i measured the distance between the ground and the bottom of the deck and found the front was 4IN offthe ground an the rear was 3 1/4 in off the fround so the front is 3/4" higher than the back
 
  #44  
Old 08-31-15, 08:06 AM
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Also both belt keepers are in place, one on each side of the crank
 
  #45  
Old 08-31-15, 08:10 AM
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Ok, i did one more measurement and at the middle of te back of the deck it was about 3" and at the middle if the front it was 5" . On the previous post i posted the height from the edge of the front where the deck started to curve
 
  #46  
Old 08-31-15, 08:18 AM
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The important measurement is with the deck in the engaged position not not all the way up. If the deck is level when lowered, that should be the main thing.
Although this method of PTO works and has done so for many years, it is still a poor mans PTO.
You might try stepping on the right side of the deck and see if the blades stop once the deck no longer touches the belt...
I don't recall nor see any "adjustments" ( MTD 131-662F118/SWC#28217 Parts List and Diagram - (12.5/38) : eReplacementParts.com )

Measure the deck with it lowered and see if it is level.
This works with a type of bell crank that when raised to the last notch, the deck should move slightly forward and up, of course it should do so remaining level and if it is not then I would suspect obstruction, bent worn or loose parts, springs improperly connected...etc.

You may need to remove the deck for better inspection of "stabilizer/lift" assembly.
 
  #47  
Old 08-31-15, 08:31 AM
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If the guides on each blade pulley are missing, the belt will flex out too far and grab on the engine pulley.
This is also a possibility, while they are not exactly "guides" and not visible in your pics, they should keep the belt from coming off of the pulley.....Item #4 on the IPL.
 
  #48  
Old 08-31-15, 09:14 AM
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With the deck in rthe first cutting position the back is 3" and front is 4"
 
  #49  
Old 08-31-15, 11:50 AM
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Here is some info that might help you out....

How to Adjust the Deck on an MTD Riding Lawnmower | eHow
 
  #50  
Old 08-31-15, 01:15 PM
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The info is not for my model
Thats for the newer ones that hae an adjustment bolt
 
  #51  
Old 08-31-15, 01:53 PM
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The measurements and such should be similar...if yours are too far off then as I said prior...something is bent, worn, missing, installed incorrectly etc.
 
  #52  
Old 09-01-15, 01:00 AM
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Are the gaurds/guides on each blade pulley or not?
 
  #53  
Old 09-01-15, 06:01 AM
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From the picture - side view of the deck - it looks like the left guard is missing.
 
  #54  
Old 09-01-15, 03:19 PM
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There are pulley guards but they are not installed
 
  #55  
Old 09-01-15, 06:26 PM
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I can't tell by looking if that particular model depends on the guards to hold the belt around the pulley when the blades are off or not, but many of the MTD products do and with the guards removed, the belt will flex outward enough to allow dragging on the engine pulley enough to turn the blades.
 
  #56  
Old 09-10-15, 11:46 AM
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I am going to take the deck off this weekend and check the lift assembly. Am i just looking for broken or bent parts or am i looking for something else?
 
  #57  
Old 09-26-15, 04:32 PM
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Anyone still looking at this?
 
  #58  
Old 09-26-15, 04:52 PM
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.
 
  #59  
Old 09-26-15, 08:14 PM
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Did you install the missing cover? Did you adjust the tab ont he deck lift handle or the sector it catches on to raise the deck a bit more?
 
  #60  
Old 09-26-15, 08:29 PM
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Since cheese was a party pooper lol (Jk bud)

Unfortunately this system can be a bit complicated and difficult to pinpoint an issue as you are having without laying hands/eyes on it. While the problem may very well be worn/bent/damaged parts, it might also be incorrect mounting of the deck if it had been removed.
You should have a square steel "Pan" for lack of a better word, at the rear of the deck with a 1/4" or so rod going through several points. Also two or more springs involved.
One thing about MTD or at least used to be, is they have manuals for viewing or download with detailed instructions and IPL's.
I can only suggest from my own early trial and errors, then learning how easy these decks can be and how effective they can be over even more expensive machines, that you remove the deck completely, you should then have 4 mounting points exposed, ensure that those 4 points raise and lower in conjunction with each other.
I might be able to find the manual to help you install the deck but will need time to research or go back and find any model # you have posted.

Azis
 
  #61  
Old 09-26-15, 09:16 PM
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I don't know if it's a shadow or what but it looks like the belt is on backwards. It looks likes like the bevels are facing out. Ya'll look good and tell me what yall think !!

And that would make the belt shorter than it actually is because it's not seating right in the pulleys. Hence too tight and SMOKIN !!
 
  #62  
Old 09-26-15, 09:27 PM
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Pic

Please take another picture of the belt with good lighting. One with the belt on the pulleys and crank pulley.
 
  #63  
Old 09-26-15, 09:47 PM
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Looks like it's on right to me. You can see the back flat side on the engine pulley pretty clearly.
 
  #64  
Old 09-27-15, 07:00 AM
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Looks like the belt is on right but there's a bend in it just above the front edge of the deck. If that is the case there would be a misalignment of the pulleys.
 
  #65  
Old 09-27-15, 07:29 AM
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Yes, i did install the missing belt guard and it made no difference and have tried all the adjustments. Also, sorry about confusi g everyone with the other thread.
 
  #66  
Old 09-27-15, 07:43 AM
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Trying to upload a pic. Sorry
 
  #67  
Old 09-27-15, 09:14 AM
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Just to clarify, is there any way on my model to adjust the height of the deck front to back? When i step on the front or put a board under the back the belt doesnt drag, the belt doesnt smoke and the blades dont spin.
 
  #68  
Old 09-27-15, 12:16 PM
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You said you can pull up on the deck lift handle and the blades stop properly right?
 
  #69  
Old 09-27-15, 12:47 PM
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Thanks guys. I finaly figured it out today. The belt guard i installed wasnt on right. Adjusted it so it fit correctly and it prevents the belt from bowing out. No smoke and blades stop. And again sorry for confusing everyone with the other thread
 
  #70  
Old 09-27-15, 05:29 PM
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I had a feeling. Glad you got it figured out.
 
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