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MTD Yard Machine 20.5 hp Drive belt problem


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07-14-08, 03:14 PM   #1  
MTD Yard Machine 20.5 hp Drive belt problem

I have a problem with my MTD garden tractor drive belts. It will not pull itself in 5th or 6th gear unless on level ground. I replaced both belts and set the linkage per the owners manual but it still does the same thing. Do I have a problem with the variable speed pulley or possibly the engine pulley? The problem gets worse as the unit warms up. Any slight uphill grade and I have to shift to 4th or 3rd gear for it to pull itself. HELP!

 
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07-14-08, 07:56 PM   #2  
Did you use M.T.D. belts or a close match from an other supplier?? Give us the model & serial # of you're unit & the belt #'s you used & the pro's will have you dialed in in no time,,,Roger

 
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07-17-08, 12:40 AM   #3  
Thanks for the reply. The Model # is 14AJ84AH062. The S/N 3F158B10165. P/N 754-0280 and 754-0446 Belts. The belt sleeves had the MTD logo on them. I hope this info helps to zero in on the problem. DKD.

 
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07-17-08, 06:52 AM   #4  
Try the mower again, when it stops moving, pull back on the
pedal with the top of your foot, see if it gets you moving.

Look and make sure all of the moving pards are lubed, and
see that no oil is getting on the belts.

Fish

 
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07-19-08, 10:09 AM   #5  
I have already tried the pull the pedal back trick with no luck. The belts are free of oil and the only place to lube is the variable speed spindle,which was greased sparingly.

 
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07-19-08, 11:26 AM   #6  
Run the mower with the cover plate off, so you can see the vari-pulley. The middle sheave of the varipulley needs to move freely, as well as the idler arm on the rear belt.

Also check the rear end, other than the 4 mounting bolts on the sides, there is another that bolts the rear end to the frame
that falls out often and causes problems on hills, etc. I go
back with a locknut so it doesn't happen again.

Fish

 
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07-22-08, 03:19 PM   #7  
The sheave and the rear idler arm both work freely but I will check the bolt in the rear end. If all else fails there is always dynamite.

 
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