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I replaced the mower belt and my blade will not disengage

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Recheck the installation of the belt, make sure that it did not get on the wrong side of any belt guards and has the correct routing. If you need a diagram to look at you can go to www.searspartsdirect.com and put in your model number (917.??????) from the tag under the seat and download the parts and/or owner's manual. Double check the part number of the belt to make sure that someone didn't give you the wrong belt.
Check the idler pulley pivot point, make sure that it is moving all the way over to put good tight tension on the belt. The belt should be almost as tight as a fan belt on a car when it is working properly

Posted on Oct 04, 2009

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Model 917.20381 riding mower. Why don't blades disengage?


Terry, Deck full of debris around belt tensioner not allowing it to release, tension arm seized/spring broke, wrong/small belt installed.
Check the attached links,instruction and guides, Good luck
"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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https://answers.yahoo.com/question/index?qid=20090407155731AACRvsq
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Assuming you have put the blade drive lever into 'disengage' check the blade drive belt tension. With blade disengaged, belt should have significant slack. You may need to adjust the control cable, adjustment is usually on the mower deck; or you may have some debris on the deck preventing the pully to release belt tension

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1 Answer

I have a 42 inch troy-bilt riding mower the blades won't disengage.


Sounds like either the switch for the blades is not shutting off the power to the electric clutch or the clutch itself is not disengaging. I would shut the mower off and unplug the wire to the electric clutch and then start the mower and make sure the blades do not turn you may have the belt for the blades on the wrong pulley and it might be causing the blades to turn. Hope this helps.

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1 Answer

I have a poulan pro PR1842STC; the blades won't stop turning after I disengage the mower belt


On the top of the mower deck, there is a spring that will pull to disengage the blade idler pulley. At the same time, it will release two springloaded arms with brakes that press on the pulleys at the top of the blade spindles. On top of the mower deck at the back, the two spring loaded arms may be held out of the braking position by a cam. Make sure the cam is free to allow the blade brakes to activate when you disengage the blades. If arms are out of alignment, or the parts are too worn, the blade brakes won't move and the blades keep spinning, even after you have disengaged and the safety switch is deactivated. This is a dangerous situation and should be fixed soon. Good luck.

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1 Answer

My pto belt doesnt disengage


have you recently replaced the belt? It might be to short. Also, check the belt tensioner and routing

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1 Answer

I have a mountfield 1538h-sd blades disengaged while mowing belts seem very slack ,but the belts are all on the pulleys.


The belts may be loose.With the mower off,engage the blades and check the tension.Next would be to get under the mower and check for debris in and around the lever that engages the blades.Sometimes trash will get hung up in there and the blades will disengage.The next step would be to inspect the pulleys for debris and to make sure the spindles are not bent.While at the pulleys make sure there are no burrs or cacks in the pulleys,as that will cause the blades to disengage.

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1 Answer

Mower will not disengage


this is because your belt that drives the blades is to tight i suggest getting a looser belt

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1 Answer

After replacing the belt, new pulleys, and bolts, my mower wont disengage the blades when i disengage the lever. when i start the mower, the blades are off, but once i engage the lever, they start, but...


sounds like the linkage to your blades, check your lever, to make sure its working right may need some grease, it may be sticking and not fully engaging, or doing its job when its supposed to

Oct 17, 2009 | Craftsman Garden

2 Answers

Craftsman riding mower blades won't disengage


This is too late, but for the next person: There is an extension spring around the cable attached to the blade engage/disengage lever.

On my tractor one end of the spring had the hook broken off or it. Because it is around the cable it is still in place but doesn't stretch when you engage the blade (so can't pull the pulley out and slacken the belt when you disengage).

The replacement is a few dollars and can be bought on ebay or Amazon.

Aug 15, 2009 | Garden

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