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Will move on flat ground, but transmission gets noisy as a load is put on it. Any adjustment, fluid check. ??
Could a bad belt do that.

Noel
 

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Fixer of Broken junk
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Sounds like another dead tuff torq.Those are supposed to be sealed units in the earlier X300 series.

Transmission: Tuff Torq K58 Type: hydrostatic Gears: infinite forward and reverse Oil change: sealed unit, service not recommended

Did find this it may help.Not sure if your's will have this fluid level check hole but none of the earlier X300s have a drain hole so it must be removed from the tractor to drain it.

https://www.tufftorqservices.com/EnvEEdefault/FlatHTML/TechInfo/ttcoil/pdfs/cc%20K58%20MODELS%20CHECKING%20AND%20%20ADDING%20OIL-rev.pdf

Whining in a small hydrostatic like that is from cavitation either from Air in the system or excessively worn drive Motor.

There are alot of videos of people upgrading to the Tuff Torq K66 and K66Y in there earlier X300 series machines but your looking at $800 on ebay for a new one or $300 for a good used one.There are a couple sites that offer upgrade kits but there very very expencive.$1,800-$2,200.

It's recommended that the fluid be changed every 100 hours and internal filter (if equipped) every 200 hours.
 

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Fixer of Broken junk
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Fixer of Broken junk
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It's an embarrassment that those were ever sold IMHO.
Craftsman sold a bunch of those rear ends under tractors... New Cubs too.
Buddy's Dad had a green one, got about 500 hours on a flat yard.
Ya there pretty pathetic.Neighbor has a 2003 JD LT160 with 386 hours on it that won't pull the lawn sweeper anymore.It has Tuff Torq K46 in it and it Still works good for mowing but that's all it will do.It has been dealer serviced sense it was new but I have no idea if the fluid was ever changed in the rear.

Pretty bad when a really really cheap single speed MTD made CVT transaxle lasts twice as long.The thin tin body panels rust apart before the CVT transaxle goes bad.
 
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