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post #1 of 12 Old 05-19-2019, 11:33 AM Thread Starter
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Loose mower belt (L118)

Another noob question. I replaced the mower belt on my L118. When the PTO is in the slack position, the belt likes to hop off of this wheel.



I don't believe a guard is missing that is supposed to prevent this...? There's plenty of tension with the PTO engaged. Not sure what to look for or do. Any suggestions? I assume it's something simple, but I don't see a solution in the owner's manual or tech manual.

And yeah, I see from this pic that something is already scraping up the outside of the belt. Super. I'll have to figure that out.

Thanks in advance,
Aram
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post #2 of 12 Old 05-19-2019, 11:53 AM
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Re: Loose mower belt (L118)

There is a stop for the tensioner arm on the deck that needs to be bent towards the left so that when at rest the tensioner arm doesn't allow as much slack in the belt.

It also appears that the belt retaining guide in the pic may be bent or it may be twisted at it's mounting point. On my current L110 refurb I had to drill out the threads in the plate where that guide bolts on and then use a longer bolt with a nylock nut on top of the plate. There is a stamped 'tab' in the guide that goes in another hole in the plate and often the guide is twisted and this tab isn't in it's alignment hole.

Basically, all the guides for the mower belt are there to keep the belt in the various sheaves even when there is a good bit of slack in the belt. If any one of these guides is missing or bent out of position then the belt is likely to fall out of a sheave somewhere. I often see people trying to use the mower without the plastic cover on the LH spindle. This cover is part of the belt retaining system. On my L110 the cover was broken in the area where a steel guide pin is inserted. I drilled a carefully located hole in the deck shell and added a long 8mm bolt with 2 nuts and washers to take the place of the factory pin. I was then able to use the still functional plastic cover over the spindle.

None of these guides should touch the belt when the PTO is engaged. It's only when you disengage the PTO that the belt moves out and touches the guides.
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post #3 of 12 Old 05-19-2019, 09:08 PM Thread Starter
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Re: Loose mower belt (L118)

Quote:
Originally Posted by rayjay View Post
There is a stop for the tensioner arm on the deck that needs to be bent towards the left so that when at rest the tensioner arm doesn't allow as much slack in the belt.

It also appears that the belt retaining guide in the pic may be bent or it may be twisted at it's mounting point. On my current L110 refurb I had to drill out the threads in the plate where that guide bolts on and then use a longer bolt with a nylock nut on top of the plate. There is a stamped 'tab' in the guide that goes in another hole in the plate and often the guide is twisted and this tab isn't in it's alignment hole.
Hmm, thanks. I hadn't noticed that. I'll check it out.

Quote:
Originally Posted by rayjay View Post
Basically, all the guides for the mower belt are there to keep the belt in the various sheaves even when there is a good bit of slack in the belt. If any one of these guides is missing or bent out of position then the belt is likely to fall out of a sheave somewhere. I often see people trying to use the mower without the plastic cover on the LH spindle. This cover is part of the belt retaining system. On my L110 the cover was broken in the area where a steel guide pin is inserted. I drilled a carefully located hole in the deck shell and added a long 8mm bolt with 2 nuts and washers to take the place of the factory pin. I was then able to use the still functional plastic cover over the spindle.
Yeah, that's why I'm so puzzled. I have all the guides in place -- but maybe one got loose or out of position (hard to see how, but I'll check).

Quote:
Originally Posted by rayjay View Post
None of these guides should touch the belt when the PTO is engaged. It's only when you disengage the PTO that the belt moves out and touches the guides.
Yeah, that part -- no idea what's rubbing. Deck dropping time again.

Thanks for your help.

Aram
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post #4 of 12 Old 05-19-2019, 11:21 PM
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Re: Loose mower belt (L118)

I looked at my L110 and with the PTO disengaged the belt is still well within the drive pulley. Maybe you can bend that tab and keep the tensioner lever from letting the belt get so loose but I think maybe you have the wrong belt and it's a bit too long.
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post #5 of 12 Old 05-19-2019, 11:29 PM Thread Starter
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Re: Loose mower belt (L118)

Quote:
Originally Posted by rayjay View Post
I looked at my L110 and with the PTO disengaged the belt is still well within the drive pulley. Maybe you can bend that tab and keep the tensioner lever from letting the belt get so loose but I think maybe you have the wrong belt and it's a bit too long.
Interesting thought. I bought it from GreenPartsStore so I can check the P/N easily enough -- good thought. Thanks.

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post #6 of 12 Old 05-19-2019, 11:33 PM
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Re: Loose mower belt (L118)

A lot of times the OEM JD belt has the pn inked right on the belt. If it's the right belt then your only hope is to adj the tab.
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post #7 of 12 Old 05-19-2019, 11:36 PM
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Re: Loose mower belt (L118)

Here is a pic with the mounting bracket for the tensioner arm and the tab in question. The tab is at the upper rh corner of the bracket. You would want to tap the tab to the left. Hopefully yours is bent way to the right and allowing a lot of excess travel in the tensioner arm.

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post #8 of 12 Old 05-20-2019, 12:27 AM Thread Starter
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Re: Loose mower belt (L118)

Quote:
Originally Posted by rayjay View Post
Here is a pic with the mounting bracket for the tensioner arm and the tab in question. The tab is at the upper rh corner of the bracket. You would want to tap the tab to the left. Hopefully yours is bent way to the right and allowing a lot of excess travel in the tensioner arm.

That's crystal clear, thanks again. I'll check, might not be able to until next weekend.

Best,
Aram
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post #9 of 12 Old 05-20-2019, 09:21 AM
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Re: Loose mower belt (L118)

Along with tweaking that tab I think your guide in the first pic needs tweaking. There should be JUST ENOUGH gap between the vertical legs of the guide and the pulley to squeeze the belt through when removing or installing the belt. This is so that the belt is maintained in the sheave and any excess length when the PTO is disengaged is forced out the front section of the sheave. The parallel sections of the belt coming from the deck are kept in the sheave on each side by the properly set up guide.

You can see that the outside of that vertical leg has paint missing where something has rubbed on it so something could definitely be tweaked.
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post #10 of 12 Old 05-20-2019, 09:22 AM
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Re: Loose mower belt (L118)

I also have to admonish you [ ] for not blowing off the top of the deck after every use.
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post #11 of 12 Old 05-20-2019, 11:02 PM Thread Starter
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Re: Loose mower belt (L118)

Quote:
Originally Posted by rayjay View Post
Along with tweaking that tab I think your guide in the first pic needs tweaking.
...
You can see that the outside of that vertical leg has paint missing where something has rubbed on it so something could definitely be tweaked.
I was thinking the same thing! It would be a simple explanation.
Quote:
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I also have to admonish you [ ] for not blowing off the top of the deck after every use.
Yes, and this time I'm listening!

Aram
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post #12 of 12 Old 05-25-2019, 02:00 PM Thread Starter
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Re: Loose mower belt (L118)

As usual, simple solution. The wire guide in the top pic was loose. Not very loose, but that was all it took. I tightened the mounting bolt and the issue appears to be fixed.

Aram
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