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pulley on Mower Deck 1966 Cub Lo Boy International Harve

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scott 1234

11-09-2023 05:17:25

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good morning. so, on another forum, folks told me my belt issue [i have brand new Kevlar belts on my 1966 IH Cub Lo Boy used in fields only a half season and they show real wear] i was told that my pulleys may be wrong. ill show 3 pictues. the main PTO and the 2 side ones. the one on left looks as original yellow paint. but thats where it sits so low. the one on the right looks newer. but seems to sit ok.. oh i may add another pictue. if i can hat is the decks main spindle. that shows the belt size must be right as they sit so nice. thought's comments on the pulley etc.???..thanks ! Scott [oh i came here now as i dont think folks on that other forum own this old type tractor i figure and know some folks here do own these old cubs from your prior help :0)

so sorry but my pic are not loading correctly.. but if you look close i think you can see what i mean

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and is about correct, and last is the main center deck spindle showing that other
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belts all seem to sit right] if thta makes sense. :0)

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scott 1234

11-16-2023 19:51:16

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

These are the photos i mentioned.. hopefully im posting correctly here tonight..

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scott 1234

11-16-2023 19:09:22

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

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Greetings .. and good evening folks. thaks for all the ideas; i will try to post a couple of other photos. to see if they tell more. 2 of them will show that the 2 pullys are of different widths [can that be right. i need to find and dig out my manual to see if it says anything]. the other photo i hope to try and post tonight shows that it is not just rust on the belts. they are fraying a bit. [side note. i just bought some emory cloth to try and smooth any rought spots, but just running my fingers around them , nothing seems to be too rough -at least to me].. ill try and do the pics in a minute in a new post if i can get my computer to work] thanks.

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steve_in_mo

11-11-2023 06:43:59

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

Fourth pictured from the top. Looks like someone ran that idler pulley into a rock or something and the pulley is not running straight. Looks like the bracket is partly broken loose where it was welded to the frame.

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300guy

11-09-2023 17:30:59

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

On the one pulley with the bolt through it and some washers, why are the washers and the pulley rivets all so dark blue? Is this bearing on the pulley in good shape, not rough rolling or anything like that? If the bearing is getting hot that will really tear up a belt in a hurry.

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BarnyardEngineering

11-09-2023 11:19:52

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

If the pulley is smooth and the belt is riding on the sides (not the bottom), then it doesn't matter how deeply the belt is riding in the pulley.

Personally if you can't find something obvious, I'd take a wait and see approach. The belt's not broken and it's not fraying. All those twists and turns are hard on the belt so it would be logical to see some initial wear.

The kevlar belt may not be the right type of belt for this application due to the twists, but that's just a guess on my part.

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Jim Becker

11-09-2023 11:15:33

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

I saw your question on the Cub site, but didn't respond as I expected someone with the same mower would comment. I now see you got no response there. So here are my observations, keeping in mind that I have never had that model mower.

The yellow idler does look original. From the one picture, if looks like the area deep in the groove where the belt runs is shiny. The upper part of the groove looks dull and untouched by the belt. If that is true on both sides of the pulley, the seemingly excessive depth of the groove isn't hurting anything and in fact may help keep the belt from jumping off.

The chewed up belt may be from an alignment problem, with the belt in hard contact with the edge of a pulley. The black (replacement) pulley may be causing such a problem. Is the pulley (at the depth the belt is running) the same diameter as the yellow idler? It looks like it may be larger and the belt not in line with the PTO drive pulley.

The chewed up belt is suggestive of a belt that has run directly against a stationary part (such as a belt guide). Look for any place where the belt runs very close to a fixed part. Check this through the entire range of lift of the mower. If may only happen if (for example) the deck is raised. Any place the belt hits should show evidence of belt contact. Look at the far side of belt guides to see if the belt was accidentally hooked over one for a period of time. A wrong-sized idler pullley can cause this sort of problem.

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John M

11-09-2023 11:11:38

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

I had that problem on my 154 w/ that mower. Mine was from lifting and lowering alot, and the belt I was using was too short. The idler pulleys were too high letting the belt ride a little higher than normal, know what I mean. Ive had the same belt(s) now for oh, 6 or 7 years and they look fine now.

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ss55

11-09-2023 10:44:01

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

The pulleys on the blade spindles are likely to be the first pulleys to wear out. Are the sloped pulley sides that contact the V-belt still flat or are they dished by wear? When the belt starts to contact the bottom of the pulley groove the belt will slip and wear out very fast. I would not worry much about the idler pulleys as they (should) transfer no torque.

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caterpillar guy

11-09-2023 09:31:15

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

Rust spots will eat belts fast. I have a similar problem with a belt on the fertilizer spreader. Now the 2 cast pulleys are where I would look for the rust at this point since the stamped pulleys seem to look like they are shiny from use. If they are rusted in spots just scrape and polish them off if not such that they will affect the use of the pulley. I typically just chp off the rust if it has much then use a file or emory cloth to polish the sides of the pulley. Once cleaned up check that the idlers don't wobble and that the belt enters the horizontal pulley underneath in line with thew sheave and exits the same. So if one is higher or lower than that sheave adjust the idlers so they are even . Your one on the left in the pictures looks like it might be a bit low and the right one might be about right. Keeping them even will make for less problems with the belt. IF one is a tensioner with a spring then it will not be able to be moved much probably. Our Corn dryer used to have a similar belt set up on it and that belt ran for many years running the vertical auger in it. I would think it was more load than your mower is with just one 5/8 or 3/4 belt to run it. We kept the idlers even and one was a spring tensioner for the belt.

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scott 1234

11-09-2023 07:12:14

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

thanks to both of you for replying: yes, my old belts lasted a long time also.. that is exactly why i am wondering why these new belts look like they do after half a season... oh. and yes.. i saw those spots on the new belt you point out.. thanks. so i guess ill ask this;

a. how do you smooth those rough spots ?frnakly i have looked over the whole thing i do not see any real rough spots.

b. my initial question was; [id you have the same PTO take off etc] what do you think abut how deep the belt is in that pully [and if it is an original one on the left.. as i say it looks like original IH yellow paint] does your belt sit that low in yours if you have the same thing?
note; i am told- by some others .. that even with no rough spots - if a belt sits too low it will wear quickly.. so im trying to figure out if these are wrong pulleys and so is it too deep cauisng the isue or not.. thanks all :0)

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BearGap

11-10-2023 01:37:24

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 07:12:14

While you may well have another issue, your comment about the previous belt lasting many years caught my attention. I have a similar Woods 59 deck under my regular Cub and had an issue with belts failing relatively soon. I was buying kevlar belts identified as specific replacements for that deck, but then after dealing with several that had failed I went with a genuine Woods belt. It has since lasted many years with regular heavy use here on the farm. I don't know what the difference is, but that's all I'll buy for that mower now.

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grandpa Love

11-09-2023 05:29:36

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to scott 1234, 11-09-2023 05:17:25

Any rough, rust spots on a pulley will eat up a belt. And wobble will too. We have run the same belt on one of our cubs for 6+ years, probably cut hundreds of acres of grass Third Party Image

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grandpa Love

11-09-2023 05:32:33

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Re: pulley on Mower Deck 1966 Cub Lo Boy International Harve in reply to grandpa Love, 11-09-2023 05:29:36

Definitely a rough spot somewhere. Third Party Image

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