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"whinning", dry grinding noise from under riding mower

I removed, sharpened and replaced the (3) mower blades on my Toro zero turn Z5300 timesaver mower and when I cranked it, I now hear a noise coming from the pulley area that houses a belt, transmission?, that runs the width of the mower. This belt is not the blade belt but the smaller belt directly under the seat. The noise sounds like the pullies need lubricaiton but how? The noise also increases when the rpm's increase?
Any thoughts?

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  • panilling9
    panilling9 May 11, 2010

    sometimes you need to remove the suspect belt in that area to free up idler pulleys and then spin

    by hand and listen.

    they should be free spinning and quiet no ruff sounds.

    sealed bearings fail due to use and grease fails or water has entered bearings

    Most do not have grease fittings and entire pulley has to be replaced for that mower or when the pulley is removed you can carefully remove the rubber seals on the bearing itself and force grease on each side of the bearing itself put seals back and this would help for awhile unless the bearing is siezed or still feels like it is still rough after grease is installed.

    as far as transmission noise check your manual but i think those transmissins are

    pre lubricated from the factory and require no service other than keeping the fans and housings clean?

    also check your belts for glazing and cracks or dry rotted that will create noise also.

    just a couple things to check hope this helps some?



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All bearings that run belts & pullies should have grease zert fittings to lube the bearings with a grease gun check if there is fittings then use a small needle or punch to push down on ball on top of zerts to make sure they are free to alow grease to enter grease them till grease comes out from under neath or the top of bearings

Posted on Jun 08, 2009


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