Question about John Deere D140 48 in. 22 HP Front-Engine Riding Mower

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How to adjust tension on belt of John Deere Ride On D140

When I am mowing it throws the belt and I cannot tighten the tension to put the belt back.

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James Basile

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John Deere 42in Deck: There are 2- 10mm adjusting bolts on the bracket that secures the cable & spring to the tensioner pulley arm. .As the belt wears it will stretch . with the engine off, tension the belt with pto on then check belt tension,it should feel firm but not loose. loosen the 2-10mm bracket bolts on the cable bracket & move away from center of deck then tighten.This will increase spring tension for the tensioner pulley.

Posted on Apr 15, 2018

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Chris Alexander

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I bought a new belt and tightened this pull and my belt still jumps off within 5 minutes of cutting. Also it only has 14 hours on it.

Posted on Jul 16, 2017

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Kprime

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How to adjusted Cutting Deck Belt Tension

You do not say which size cutting deck you have. I will be writing about the 48", 3 blade cutting deck

The belt on this deck is self tensioned. The tension is provided by a spring attached to a moveable pulley on the deck. When the belt is in place you can manually force this pulley forward/backward and it will release the tension.

If the belt is off track, place the belt back around all the pulleys in the correct path, lastly force this spring loaded pulley forward/backward (depending on your deck, the direction is not important, the tension is) to get the belt around the pulley. If the belt is placed correctly, when you release the spring loaded pulley it will properly tension the belt.

Typically, these belts should not be jumping off. If yours is coming off frequently the belt may be worn. When they wear they get quite a bit longer, then the tension pulley cannot apply the correct tension. Rarely does the tension spring have to be replaced.

The other problem that causes belt jumping is worn spindles and stationary pulleys. The spindles are the most likely to need replacement. You can buy excellent replacements for JD spindles on Amazon for very reasonable prices. The following spindles are super replacement spindles for the 48" deck. They may very well be the same for smaller and larger decks; I have not researched that. Just search Amazon for Silver Streak # 285851.

Silver Streak # 285851 Spindle Assembly for JOHN DEERE GY21098, JOHN DEERE GY20962,

Product description:
Spindle Assembly / John Deere GY21098 Pack Size:1 JOHN DEERE GY21098, JOHN DEERE GY20962, JOHN DEERE GY20867, JOHN DEERE GY20454 OREGON 82-359, ROTARY 12910, ROTARY 11964 JOHN DEERE D100, D110, D130, D140,D150,D160, LA100, LA105, LA110, LA115, LA120, LA125, LA130,LA135, LA140, LA145, LA155, LA165, X110, X120, X140 Includes grease Zerk, pulley lock nut, blade lock nut, and washer , Height: 7 ", OD: 5 "

You can also find replacements for the flat pulleys on Amazon. If you cannot find what you need there, go to http://www.greenpartstore.com//


How to adjust tension on belt of John Deere Ride O - adjust-tension-belt-john-deere-ride-d140-1chhwwyjvhrciwi1l0smxmwl-3-1.jpg

Posted on Mar 15, 2015

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Is there a way to tighten the belt?


Don, there is usually a spring loaded tensioner to do this, the belt may be stretched and needs replaced, or some pulleys actually are now wear items and may need replaced. Check the video links below, some models are adjustable.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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http://support.mtdproducts.com/app/answers/detail/a_id/563/~/deck-drive-belt-tension-adjustment---riding-mower-(step-thru)

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The X300 has a self adjusting tensioner on the drive belt. Are you trying to mow uphill in the morning? or when the grass is wet? And did you buy it new, and how long has it been acting this way. Have you had a rear flat tire repaired latley? These are some questions that will help us answer you problem.

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If you need further help, I’m available over the phone at https://www.6ya.com/expert/matt_8dbc24bf722649ac

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