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I change the deck belt about 6 times the mower will cut the belt and the belt slip off the track, also the tension spring keep broke 3 timas.

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Most likely problem something is bent on the deck or a cracked support holding one of the pulleys that the belt is traveling on, if the keep is breaking the spring might be pulling the pulley out of alignment or the bearing is heating up and burning thru the belt

Posted on Sep 24, 2009


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well there isn't much of one , most times I get one of these that the clutch slips ,it's time for a new belt , if you follow the clutch pedal (with mower deck removed) to under the tractor , there your gonna see a spring there , that's all that keeps tension to belt , that's why I just change the belt

Oct 02, 2014 | John Deere Garden

1 Answer

Craftsman LT2000 lawn tractor keeps throwing deck drive belt

Keep in mind that the mower deck gets to be raised and lowered into the desired mowing height, with no change to drive pulley (at motor) height. This requires a belt long enough to allow the furthest reach (usually with deck dropped to lowest setting) and a spring loaded tensioner pulley, to take up the slack (and keep the belt tight) as the deck is raised. There may also be a belt guide or two incorporated to help keep the belt from jumping ship in the process. Sometimes these are just a heavy gauge steel wire loop that attaches near the pulley to keep the belt from jumping if it gets slack. Possibly you didn't thread the belt through or under it properly, or have missed the tensioner pulley.

It could also be the tensioner spring is broke or has fallen off or become too weak. Have someone move the deck up and down (with motor off, and belt installed) while you watch to see there is any obstruction in path. Also look for the belt becoming loose at a certain point. Some tensioners have the spring built in to the pulley and you can't really see them. They have to be pre-loaded, by rocking the pulley spindle assembly against the spring force while you slip the belt over it. Sometimes the belt looks fine and not loose in static (not moving) condition, but when the blades are spinning fast and the throttle is closed with no load (no thick grass being cut) the blades momentum will cause a belt sag that is supposed to be taken care of by the tensioner. It can get pretty grimy down there, also very dry, dusty and caked with cement like old clippings. Check the manual and find out where your tensioner is, then check it to make sure that it can move freely and it isn't locked tight by debris or rust. Also good to check if there has been an update to your mower. Sometimes these problems cause a manufacter to offer a better spring, or change pulley sizes to correct a common problem.

Aug 11, 2014 | Garden

1 Answer

How do i adjust tension on drive belts

Hi there, If you lower the deck to its lowest level and follow the track of the deck belt you'll see the tensioner pulley. Check its spring is still engaged and strong enough, some mowers let you hook the spring into different holes for more/less tension. Check the pivot bush isn't too slogged out for it to tension properly.

May 24, 2014 | Poulan 42-Inch Steel Deck 17.5 HP Briggs &...

1 Answer

The lawn mower belt is to loose how do you tighten it

You don't tighten the belt, there is a idler pulley it's between the motor pulley and the blade pulley where the chute is.

This has a spring that keep tension on the belt, so either the spring is bad, or see if there is another slot for the spring to make it pull more, or you have the belt routing on wrong.

Your manual should show the belt track.

If you can't move the spring and the belt is correct, get a new tension spring.

And clean off that deck, LOL

Apr 14, 2013 | Garden

1 Answer

Can't get enough tension on pto belt

make sure you have the proper belt

Sep 23, 2012 | Garden

1 Answer

I have a Sears Garden Tractor with a 48" mower deck. By working in long, thick grass I broke the mower belt -- not the one that transmits power from the engine, but the belt that sits in a pulley on...

I believe that tensioner pully has to be loosend up and moved.
Here are the instructions for this.
  • Place the deck in the lowest position using the hydraulic piston (if applicable) or the manual cutting-height adjuster.

  • 2

    Remove the deck-to-PTO belt from the PTO by releasing tension on the idler-arm pulley. This is a spring-loaded handle that turns in only one direction by hand and relieves the tension on the belt. Slip the deck-to-PTO belt off the PTO pulley after the tension is relieved.

  • 3

    Remove the deck from underneath the mower or tractor.

  • 4

    Locate any belt stops and loosen them with the ratchet wrench and proper socket. Belt stops are located on the deck and are the small metal brackets that guide and secure the belt to the pulleys so it will not jump off when under heavy use, or stretch from normal wear.

  • 5

    Remove any pulley covers by removing the retaining screws using the ratchet wrench and a socket.

  • 6

    Loosen the idler-pulley retaining bolt (located on the underside of the mower deck) to replace the deck-to-PTO belt. Removing the bolt is not necessary. Loosen the pulley enough to wiggle the belt free from the pulley and remove and replace the belt.

  • 7

    Remove any arbor covers (if applicable) that conceal the arbor pulleys by removing the retaining screws with the ratchet wrench and a socket to replace the mower arbor belt.

  • 8

    Locate the tensioner pulley on the mower arbor belt to replace it. Loosen the tensioner pulley bolt enough to slide it and release tension from the belt. Remove the belt from the arbor pulleys and replace it.

  • 9

    Slide the tensioner pulley back leaving about 1/2-inch of play in the belt and tighten the bolt. Reverse the procedure to put the rest of the mower deck back together and reinstall on the mower or tractor.

  • May 10, 2011 | Craftsman 42 in. Deck 19.5hp Lawn Tractor

    1 Answer

    Belt slips on bolens riding mower has new belt

    there is a belt which drives the deck/blades, and another belt which transfers power to the transmission to move the mower. you do not specify which belt, but as they both have a tensioner, you need to locate the pulley which removes the slack from the belt and replace it and the spring which provides the tension. you had to release this tension in order to install the belt so you know exactly where it is. oftentimes a close examination will reveal that the belt was not put back on correctly. if it was slipping already, you replaced the belt and it is no better then replace the tension spring. if it was working fine and the belt broke due to wear and now it is a new belt and slipping i would closely examine the path of the belt all the way around and make sure it is in right. often times there are small dowel shaped steel keepers and guides which are supposed to hold the belt in but the belt has inadvertently been routed around them which makes it slip.

    good luck

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    sounds like spring tension on top of deck is connected to a bolt post,mine broke and went missing with the spring,blades kept slipping,didnt know how to tighten belt,go figure

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