My 18 hp cub cadet deck belt continually jumps off pulley

https://www.partstree.com/parts/cub-cadet/mowers-zero-turn-lawn-mower/m60-kh-53ab5bdx750-cub-cadet-commercial-tank-zero-turn-mower-27-hp-kohler/fabricated-deck-spindle-assembly/


Likely the deck idler pulley is loose or bearings are shot. The pulley should not wobble and the flat side of the belt should ride square against the pulley face (the pulley should be reasonably perpendicular to the deck). If not, the idler arm pivot is loose or the pivot bolt and arm are shot. Check proper tension is applied by idler pulley torsion spring (the belt is not loose).

Comment here and Ill assist further if need be.

https://www.cubcadetpartsnmore.com/Cub-Cadet-LT1018-Manual

That will depend on the model of your mower. Generally you have to remove the deck and deck belts. The drive belt usually goes from the engine pulley to the transaxle pulley. There may be a tensioner pulley as well that keeps the belt tight.

Changing the Blade Drive Belts:
a.Set the parking brake. Remove ignition key and both spark plug caps.
b.Unscrew the wing nuts from the deck covers and remove both covers.
c.Using a 3/8" socket breaker bar or socket ratchet insert the drive end into the 3/8" square opening in the lower idler arm assembly and push the idler arm counterclockwise. While holding the idler arm back, loosen the blade drive belt from the pulley and slide the belt away from the pulley.
d.Remove tension of the PTO belt by moving the belt tensioning rod. Loosen the belt retaining bolt.
e.Pull the tensioner pulley away from the belt and remove the PTO belt then remove the blade drive belt.
f.Reverse the process to install the belt.

Download the owners manual from Cub Cadet using model number 13A-244G100.

Customer Service Cub Cadet

Round the two outer pulleys on the deck. Round the the outer pulley in middle deck, round idle pulley inside, next pulley in center of deck to drive pulley

Link to see video of the Fix for cubcadet deck belt coming off can be viewed here: http://www.youtube.com/watch?v=Pd4nYovcnvY

check that the idler pulley is assembled on the belt properly as the belt is not to run against itself at any time

Belt has broken, or jumped off the pulley, or jumped off the belt tensioner. Look at your deck and go from there. You may have to remove your deck to get to the belts under there cvers but you will see your problem.

hi there pauly 46 here

here is web site for streetsign cub cadet 982 46 " deck with 3 blades

http://www.partstree.com/parts/?lc=cub_cadet&mn=336+46%22+Mower+Super+Garden+Tractor&dn=0057000002

this shows deck belt routing

and here is website area for 982 parts break down for model 982 cub cadet
http://www.partstree.com/parts/?lc=cub_cadet&mn=982

take a look cheers hope it helps

pauly46