Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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Starts will not move forward or backv belt is broken how do you change it can i do it without removing the deck

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No, the deck will have to be removed. You will also need to remove the stacked pulleys from the crankshaft of the engine. There are 2 idler pulleys in the middle of the belt path that will also need to be loosened in order to get the belt around them. You will need to put the new belt around the rear (transmission) pulley first, then work your way forward. Make sure to get the belt installed completely against the pulleys and not around the belt guides, as this will destroy a new belt very quickly. The 2 middle pulleys will be spring loaded. Mount the belt around them, then take the belt to the front. It may be helpful to engage the parking brake, as this will hold the tension off of the middle pulleys while you put the belt on the upper pulley of the front pulley stack. Reinstall the front stacked pulleys and release the parking brake. Carefully inspect the entire belt path. The belt should be tight, but movable. It should also not be touching anything except the pulleys. If all looks well, fire it up and test drive. If that goes well, reinstall the deck. The whole job should take an hour or two.
Good luck!

Posted on Aug 31, 2010

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Follow the procedure: ---
Park the tractor on a level surface. Set the parking brake and remove the key from the ignition. Study the belt replacement guide decal located underneath the left foot board for proper belt routing instructions.
Remove the mowing deck by first moving the attachment clutch lever to the disengaged position (toward you). Move the attachment lift lever all the way forward to lower the mower housing to its down position.
Crawl beneath the tractor and roll the drive belt off engine pulley (it hangs directly beneath the engine). Remove small retainer clip that holds the clutch spring to the pulley bolt located at the center of the mowing deck. Remove the large retainer springs (two of them), then slide the belt collar away from the mower housing and off the housing bracket.
Disconnect the anti-sway bar rods from the chassis brackets by removing the retaining cotter pins. Disconnect front links from the mower deck by removing retaining cotter pins. Disconnect the suspension arms from the rear mower deck brackets by removing the two cotter pins.
Move the attachment lift lever all the way to the forward position to raise the mower suspension arms to the full up position. Slide the mower deck out from beneath the tractor.
Crawl beneath the tractor and roll the drive belt off of the stationary idler pulley and the clutching idler pulley. They are both located immediately adjacent to the engine pulley. Be sure the belt is already away from the engine pulley, as well.
Push the drive belt slack toward the rear of tractor. Remove the drive belt from the Trans axle pulley by taking it over the trans axle pulley while compressing the movable belt keepers surrounding it. Remove the old belt from the tractor by pushing it clear of the center span keeper (located beneath the Trans axle pulley).
Install a new drive belt by following the reverse of the instructions for removal. Test the tractor and mower for normal operation.
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