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tommyg

Mower belt keeps falling off

By tommyg, in Implements and Attachments

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tommyg    154

tommyg
Posted

For the third time in a month, I'm faced with replacing my mower belt on my d180. It keeps jumping the pulley on the mower deck. This time when it fell off, it got sucked under the spinning blades and chopped into pieces. Anyone have any insight on why this keeps happening? Everything looks to be in alignment. No frozen bearings or anything. I'm not sure I'm getting this thing tight enough, but I don't want to make it too tight either. Is there a proverbial "rule of thumb" on how tight the mower belt should be?

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JackC    617

JackC
Posted

I had a similar problem with a C-165 with a 42 inch side discharge deck. It turned out the tension mechanism on the deck was gummed up with grease and grass and was not putting enough tension on the belt. After I took the belt covers off and cleaned it up the problem was resolved. Common causes of belt jumps are miss-aligned pulleys and insufficient tension due to crud build up, wrong adjustments, or wrong belt size.

Have you had the deck off to go over it to make sure everything is clean, free and lubricated properly?

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tommyg    154

tommyg
Posted

Seems to be. Belt fits good. The tensioner mechanism is a little tough to turn. Could probably use a bit of lube. Maybe I'm being a bit to cautious on the belt tension. I'm just trying to minimize the load on the center deck bearing. I'm wondering if it was the right belt size. The original belt broke just because it was old. The new one was purchased on a guess as to the deck's model number. Now that I have that info, perhaps the belt was too big for the grove of the pulley. Just thinking out loud, I guess.

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JackC    617

JackC
Posted

There are many different configurations for belts. There is also a belt book somewhere on the internet.

Here is a thread with what may be the correct belt.

Are you looking for the belt on the deck or the tractor belt that drives the deck?

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