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model 917.270622 weak forward, no reverse (squeals)

Check the belt - glazed or stretched ?

pretty shiny. may be original! replacing tomorrow.

replaced belt. seemed to have same problem. pulled control arm to roll and mower would not move. rocked it a bit and some thing came loose. now it will roll and go into gear. not happy. something must be wrong with control arm. any help?

Being it is a hydro drive ... The hydro is belt driven that moves the oil thru the drive to move the wheels .
You have changed the belt and you have the same issue . Check the hydro oil level . Rare that it drops down unless you heated it up with dead grass around it . I see more cub cadets and simplicity at work . I have a LT1000 that will not die .
If the belt is on the wrong side of the tensioner you'll be stuck rolling . Double check your brake and hydro pedal for binding - very common in cubs .

will check fluid. still wondering about tires locked in freewheeling mode until shaken then tires roll freely.