JD SX85 no drive


  #1  
Old 02-26-19, 02:00 PM
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JD SX85 no drive

Got trans to shift now the axle does not turn. On motor there are 2 pulleys, the lower pulley drives the blade and upper pulley goes to transaxle. The upper pulley does not turn at all. the belt pulley turns good. Is there a key or something between pulley and motor shaft.
 
  #2  
Old 02-26-19, 03:37 PM
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My guess is there is a keyway in the motor shaft and the motor pulley powering the transaxle, The key(and pulley) is held in place with a setscrew in the motor pulley powering the transaxle. There must be enough vertical room for the motor pulley (after setscrew loosened) to move up/down for the key to have fallen out. Verify setscrew is in the motor pulley. If not, go to the dealer and get a setscrew and key.
 
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Old 02-27-19, 11:04 AM
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The pulley is keyed to the engine shaft but no set screw.
 
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Old 02-28-19, 06:54 AM
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How is the pulley's vertical position maintained so the belt to the transaxle is always level?
 
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Old 02-28-19, 10:45 AM
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Hard to see but the drive pulley sits on the blade pulley. doesn't look like there is a gap between them. Will find out this weekend if weather is nice.
 
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Old 03-01-19, 09:12 PM
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The motion drive pulley is welded to a keyed sleeve and the deck drive pulley is welded to the bottom of it. It slides all the way up on the crankshaft until it bottoms out and a bolt is put in through the hole into the end of the crankshaft. It's called a stack pulley.
 

Last edited by cheese; 03-03-19 at 02:10 AM.
  #7  
Old 03-02-19, 05:56 AM
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pugs1, based on Cheese's description of the assembly, the weld between the drive pulley and sleeve has cracked such that the drive pulley doesn't rotate with the sleeve. If the drive pulley/sleeve has not been damaged, I would remove the assembly from the crankshaft and get the drive pulley re-welded to the sleeve (I am assuming the cost of welding is less than a new assembly). Good luck.
 
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Old 03-02-19, 07:39 AM
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Have a buddy who as 1/2 interest in mower who does welding, Now to get to pulley off to do this Don't know weather to take engine off or drop axle.?
 
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Old 03-03-19, 02:13 AM
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You can take the pulley off without removing the engine or the transmission. Take the bolt out of the center of the pulley and slide it down off of the engine crankshaft.
 
  #10  
Old 03-20-19, 11:30 AM
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Update Had to pull engine to get pulley off. Found weld two pulleys broken.. Rewelded the pulley and put back together .. Have not seen that before. Hard steering was Front wheel king pins not been lubes in years. Had to knock wheels out and clean and lube pins , Runs like it should.
 
 

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