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Craftsman Rear engine mowermodel #ZTS7500

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Craftsman ZTS 7500 Riding Mower - Cutting Deck

I have a ZTS 7500 riding mower model 107.27790; Briggs & Stratton 24 hp; 50 inch mowing deck. The mower deck is not cutting grass. Blades are turning slowly. Belts look good and springs are attached but seems like there's not enough tension on the belts to turn the mower blades. Seems like a lot of belt slippage. What can I do to resolve this issue? Thanks.

Posted July 18, 2013

Answers

Yadira B, July 18, 2013

I know that it can be very inconvenient for you not to have your mower working properly.  While you are waiting for an expert to respond, I have added a helpful link (click here) that may provide information to assist you with your question.

Mark T , July 19, 2013

Thank you for your question. I am sorry you are having a problem with your Craftsman mower model 107.27790.  I will be happy to assist you with this. If the belts do not seem to be tight enough I recommend checking the belt routing first. I posted an image below that shows the belt routing. Just click on the image to enlarge it. If the belts are routed correctly I would check the tension springs on the idler arms. The spring is what keeps the belts tight. If the springs are connected, the problem is likely the pivots for the idler arms are rusted. When this happens, the spring cannot tighten the belts because the idler arm is stuck. To cure this, I recommend removing the belt and locate the idler pivot bolt. Then soak the bolt with some penetrating oil and work the idler back and forth by hand.  After you have the idler moving freely, reinstall the belt and check the operation. If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a  Sears technician.  Here is a link for the website: Sears Home Services.I hope this is helpful. Please let me know if you need further assistance.  Thank you for using Manage my life. Mark T.

John, July 20, 2013

The belt routing is good and the idler arms are freely moving. The mower blade that runs off the top belt (PTO pullley) is cutting fine. The two outside blades running off the bottom belt aren't cutting. The blades are turning but not cutting. Do belts stretch out over time? We had the mower maintenanced by Sears this spring with new blades but service tech said belts were fine. What do you suggest?

Mark T , July 23, 2013

John, If the one blade is cutting fine the problem will be with the secondary belt. I recommend checking the spring on the secondary idler. If the spring is not stretched and the belt is routed correctly, I recommend replacing the secondary belt. Over time, the belts can stretch out. If the spring is stretch but the belt is not tight, I recommend checking the idler arm for the secondary belt. If the belt is tight and the spring is stretched, I recommend checking the bottom pulley on the main mandrel. The pulley may be slipping on the shaft. I hope this is helpful. Please let me know if you need further assistance. Thank you for using Manage my life. Mark

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