Problems with 48” Scag Belt Drive Walk-Behind Mower – Won’t Drive in 1st or 2nd Gear

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I'm having a problem with my 48-inch Scag belt drive walk-behind mower. The mower won't drive properly in 1st or 2nd gear under normal operation. However, if I pull up on the gear shift lever, it will drive in those gears—just not consistently or as it should.

Gears 3 through 5 work normally with no issues.

I'm looking for help diagnosing the problem. Could it be an issue with the gear linkage, belt tension, or something in the transmission?

If you've had this issue or have any ideas, please drop a comment. Any advice would be appreciated.
 
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