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Old 11-05-2009, 10:19 PM   post #1 of 7
MikeD94
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Default Idler Spring Broke - 20hp 46in Deck

Hello all. I have a problem with my MTD riding mower (model no. 13AI608H062). It has a single speed transaxle with variable speed pulley. This problem started after a spring (tying double idler pulley to the transmission idler pulley) broke.

I ordered a correct new MTD spring. Installed it then went cutting but the speed of the mower is much slower than before. There is no slipping (it climbs hills fine). If I really push down on the pedal really hard its speed increases close to normal speed.

Could the belt stretch instantly when the spring broke? I don't think so. But the belt seems to be really loose even when pressing down on the pedal. I have no idea what is normal in regard to how loose the belt should be.

Could the problem be related to the variable pulley? How do I check this
pulley for normal operation?

-------------------

Okay, I just removed the variable speed pulley and it looks fine. Same for the belts. The pulley slides and rotates smoothly. So that rules out a problem with the variable sp pulley.

I took a pic of the idler pulley arm with a new spring put on. Is there anything missing? Perhaps there should be another spring from the transmission idler pulley to the tab at the rear just under the transmission pulley? My manual is not clear on what springs go where.

Please disregard the belts in the pic. They are off the pulleys.



Any help is appreciated.

MikeD
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Old 11-05-2009, 10:43 PM   post #2 of 7
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Default Re: Idler Spring Broke - 20hp 46in Deck

Quote:
Originally Posted by MikeD94 View Post
Hello all. I have a problem with my MTD riding mower (model no. 13AI608H062). It has a single speed transaxle with variable speed pulley. This problem started after a spring (tying double idler pulley to the transmission idler pulley) broke.

I ordered a correct new MTD spring. Installed it then went cutting but the speed of the mower is much slower than before. There is no slipping (it climbs hills fine). If I really push down on the pedal really hard its speed increases close to normal speed.

Could the belt stretch instantly when the spring broke? I don't think so. But the belt seems to be really loose even when pressing down on the pedal. I have no idea what is normal in regard to how loose the belt should be.

Could the problem be related to the variable pulley? How do I check this
pulley for normal operation?

-------------------

Okay, I just removed the variable speed pulley and it looks fine. Same for the belts. The pulley slides and rotates smoothly. So that rules out a problem with the variable sp pulley.

I took a pic of the idler pulley arm with a new spring put on. Is there anything missing? Perhaps there should be another spring from the transmission idler pulley to the tab at the rear just under the transmission pulley? My manual is not clear on what springs go where.

Please disregard the belts in the pic. They are off the pulleys.



Any help is appreciated.

MikeD
************************************************** ***
Mike,welcome to the forum.

The only MTD I ever worked on had two springs and idlers as I recall. The operator had control of the tension on the one the pedal or lever was hooked to and the other spring was fixed.

If it worked correct before the spring broke it seems like maybe you were either given the wrong spring or possibly it is hooked in the wrong location.

Sorry I can't be more precise with the help. Hopefully someone more familiar with your model or with a manual and diagram will chime in.
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Old 11-06-2009, 08:09 AM   post #3 of 7
MikeD94
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Default Re: Idler Spring Broke - 20hp 46in Deck

Thanks for the welcome!

Anybody else with suggestions?
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Old 11-06-2009, 09:52 AM   post #4 of 7
Woofer
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Default Re: Idler Spring Broke - 20hp 46in Deck

My deck is much older and setup different than yours so i won't be much help either, other than to say your thought of something missing to that second tab was the first thing i thought of when looking at your pictures. Hopefully by this evening someone will chime in maybe even with a manual and get you pointed in the right direction. Good Luck!
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Old 11-06-2009, 08:06 PM   post #5 of 7
MikeD94
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Default Re: Idler Spring Broke - 20hp 46in Deck

I think I figured out what's wrong. I hooked up one end of the spring to the wrong part. The spring should mount from the transmission idler pulley to the frame.

The owners manual was no help and neither was the local lawn mower shop when I inquired about where the spring go. The shop looked up on their computer which pulled up the same thing as my manual.

I found it by researching the 'net and came across this:

http://manuals.mtdproducts.com/mtd/D...=769-02100.pdf

It's for a Cub Cadet which has similar drivetrain as the MTD.
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Old 11-06-2009, 09:08 PM   post #6 of 7
texas lawn ranger
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Default Re: Idler Spring Broke - 20hp 46in Deck

MikeD94,

Thanks for posting the link to the Cub Cadet service manual. I reviewed it carefully, specially the section of the variable speed pulley and adjustments. This would have helped me weeks ago when I struggled with a neighbor's MTD 607.
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Old 11-07-2009, 07:50 AM   post #7 of 7
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Default Re: Idler Spring Broke - 20hp 46in Deck

Just glad we could be of assistance.
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