Question about Craftsman 21 Hp 42" Deck, Ys 4500 Lawn Tractor

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I have a problem with my cut deck on a ys4500 42" yard tractor. one blade has play in it between the pulley and the blade. The blade cuts gouges in my yard, how do I fix this?

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You need to replace the bearing.This job is best undertaken by two people, (because it makes it easier) and with the use of oxy-cetalene, to free off the fixing. Because generally they seize on.
There ya go. Happy gouge free mowing.

Posted on Jul 27, 2009

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Yard works 4.5hp 42" cut lawn tractor cuts fine when mower deck is up on 4, but when it is lowered it cuts out and won't cut the grass.


4.5 hp will not power a 42 inch deck any way you cut it quite likely the blades need sharpened real bad .motor needs to run fast when tryng to cut also as that throws the grass out of the deck

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I can't get the deck to ride/cut evenley on my montgomery wards yard tractor


check your blades,Needs to be leveled , Possible bent deck.

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How do you unstick idler pulley


do you mean stuck as in the pulley doesnt turn? or stuck as in the arm that the pulley is attached to will not pivot? if its the pulley, replace the pulley. If its the lever, you will probably have to clean dirt or debris from between it and the cutting deck.

Jun 08, 2014 | Craftsman 24 Hp 48" Deck Yard Tractor

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Bled on cutting deck spins free and will not cut grass


Hi there,
I assume you mean the blade on cutting deck?
Is the pulley that drives it still firmly connected to it? (I mean the pulley and the blade spin together as one, and not independently)
If the blade is loose on its spindle check under the deck for damage, and that the blade securing bolt(s) are intact and tight.
If the problem is that the pulley isn't getting driven by the deck belt, that is a different story. Most likely the deck belt isn't getting enough tension to grip the pulley. Check the tensioner is working properly and the spring is still hooked up and working.

Sep 02, 2013 | Craftsman 42 in. Precision Cut Plus 24hp...

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I have a Husqvarana CTH171 , The unit drives fine but when I engage the cutting blades the engine cuts out / stalls, all help appreciated.


Sorry to say it but someone probably hit something and the blade, pulley or deck is bent and when ever you engage the belt for the blades and they wont turn and the pressure is to much for the mower then it dies. You will need to measure the blade on one side and see if the measurement is the same one the other side of the mower but the same side of the blade. if the measurement is not the same or wont move check to see if the blade is against the deck if it is and the blades are not bent your pulley and shaft could be bent and you can measure both right and left sides of the pulley on top not blades side of the deck, if the measurement is different it is bent and you will have to take it to a service repair shop . You would have to check with the service or warranty company. If I can help further please contact me. Thank you.

Jul 03, 2011 | Husqvarna 23 Hp 48" Deck Yard Tractor

1 Answer

Cutting blade barring ***


I think that part is called a mandrel, pulley on top and blade on the bottom.
Generally you remove the deck, take off the deck belt, take off the covers, take off the blade, remove the bolts holding the mandrel to the deck. Get a new mandrel at a sears store or small engine repair shop and reassemble in reverse order. May want to do them all while you are at it and save yourself duplication of work next year.

Jun 04, 2010 | Craftsman 20 hp 42 in. Deck Yard Tractor

1 Answer

Mower squeeking - mowing as usual, and it's squeeking, checked oil, it has oil in it, what else should I check, mower 1 year old, I've done minimal maintenance on it. and can't find my owners manual.


Does it squeek when at an idle, or when driving, or cutting? Does it cut fine? I would check the belts and pulleys and blades for extra play. I had a mandrel bearing go bad on my ys4500 (also about a year old) and the first symptom was a squeeling sound when the blades were enguaged. Play in the mandrel caused the belt to squeek at the pulley that turns the blade. It also cut some nice gouges in my yard due to a floppy blade. I hope that this helps, I got the answers to my problem here on fixya.com.

I believe that one can find a downloadable .pdf version of the owners manual with a quick google search.

good luck

Jul 12, 2009 | Craftsman 21 Hp 42" Deck, Ys 4500 Lawn...

1 Answer

Have to overlap about half my cutting deck to get clean cut.


A: Is the blade on right?

B: Is the belt on the pulley?

C: Is the blade tight on the spindle?

D: Does the spindle turn freely with the belt off?

I can't think of any other possibilities

Jul 03, 2009 | Craftsman 21 Hp 42" Deck, Ys 4500 Lawn...

2 Answers

Owners manual


Maintaining Riding Mowers Regular maintenance can reduce repairs. pagetools_04a.gif spacer.gif spacer.gif
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Components of a typical riding lawn mower. (click to enlarge)
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It's fun to ride around the yard on the mower, watching scrubby grass (and weeds) turn into trimmed lawn. However, when the grass looks as bad after you mow as it did before, or the mower doesn't want to start, riding mowers aren't as much fun. That's when it's time to put on your Fix-It Club hat and have some more fun.

A riding lawn mower is a gas-powered machine for cutting grass. The engine turns a rotating blade that cuts the top off the grass blades to a specified height. The operator sits atop the mower on a tractor-type seat with speed and height controls nearby. Riding mowers also can be used to pull small utility carts for other yard jobs.

To remove the mower deck:
  1. Make sure that the parking brake is locked.
  2. Place scrap lumber under the front and rear of the deck.
  3. Use the deck lever to lower the deck.
  4. Remove attachments from the deck.
  5. Remove the blade drive belt from the front pulley.
  6. Remove the front and rear deck fasteners, following instructions in your owner's manual.
  7. Use the deck lever to raise the deck.
  8. Remove the scrap lumber.
  9. Remove the deck from under the mower.
To adjust the drive belt:
  1. Remove the belt from the large idler pulley.
  2. Remove the belt from the adjustable idler pulley.
  3. Carefully remove the spring-loaded large idler pulley.
  4. Loosen the adjustable idler pulley and move it slightly toward the rear of the mower to tighten it[md]or move it toward the front to loosen it—and retighten the pulley.
  5. Replace the belt.
  6. Check belt tension and readjust as needed.

Apr 12, 2009 | Garden

1 Answer

Craftsman 42" riding lawn mower blade free spinning but wont cut


It sounds to me that you need a new mower deck drive belt, or your blades need sharpening. If the blade edges are rounded, they won't cut butter... Also, when mower is off, check mower deck drive pulleys to make sure you don't have any that are locked up or are dragging. You can check this by pulling the belt away from pulley and spinning the pulley by hand. MOWER MUST BE OFF before attempting any of these checks. You would be surprised how many people would try this with the mower running.
Hope this helps

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