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Old 08-25-2023, 12:52 PM
Steveo123 Steveo123 is offline
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Join Date: Aug 2022
Location: SC
Posts: 7
Default Speed variation of deck spindles?!

Hi everyone;

I have been working on my 44 inch mower deck, which is under my 1974 IH Cub 108. I have successfully adjusted the mule drive pulleys so that the drive belt actually stays on and doesn't start smoking!

However, I've noticed something strange; as I'm mowing, the spindle on the left side of the deck (i.e. the one whose upper tip is visible while mowing) noticeably slows down, indicating that all three blades significantly slow down. As you might expect, this results in uneven mowing, which in turn means I have to run many more "laps" on the lawn to get all the missed spots.

The tractor's engine (the Kohler 10hp) runs fine, and doesn't seem to be the issue; the spindle noticeable slows down, but the engine speed remains constant. Thinking this was a slipping deck belt, I tightened the tension pulley's spring on the deck by attaching it to the second hole on the deck, resulting in a tighter spring. This doesn't seem to have any effect.

The spindles all seem fine (i.e. they aren't binding up or otherwise indicating any issue(s)).

Has anyone experienced this before? Could it be the drive pulley is not tight enough (i.e. adjusting the j hook to tighten it up? Any thoughts or troubleshooting ideas would be greatly appreciated!
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Old 08-25-2023, 01:31 PM
Red Dave Red Dave is offline
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Join Date: Aug 2019
Location: PA
Posts: 131

Could the PTO clutch be slipping?

Is it in thick, tall or heavy grass, or easy to cut grass?

Are the blades sharp?

Just spitballing here.
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Old 08-25-2023, 01:45 PM
West Valley G West Valley G is offline
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Join Date: Mar 2016
Location: Three Forks, MT
Posts: 743

Just to help with the spit balling the first thing I thought of was. Is the
idler pulley on the deck actually tensioning as it should. Is the spring still
intact. I have had to replace those, have seen them broken.
At least the belt stays on eh,

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Old 08-27-2023, 09:40 PM
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CubDieselFan CubDieselFan is offline
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Join Date: Aug 2010
Location: TN
Posts: 1,939

I had a pulley separate on my 102 years ago. Similar symptoms you described. It would spin until it got under a load.
1572, 1864 x2, 1810 x2, 1863 & GT1554(Dad's Ole Mowers), 1811,782D, 1872 x2, 782DT(Sold), 3235, 1860, 1772 with 3-point and Turbo.
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Old 09-18-2023, 01:36 PM
Steveo123 Steveo123 is offline
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Join Date: Aug 2022
Location: SC
Posts: 7

Thanks, all, for the input! I apologize for the late reply; I posted, and then had all sorts of things come up. Frankly, forgot that I posted!

I'm going to troubleshoot these things and will repost if/when I figure it out.

Again, thanks!
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.

MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.

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