Hydrostatic transmission will not engage - Husqvarna Lawn Tractor - 54in. Deck, 26 HP, Model# LGT2654

Assuming it is a hydrostatic transmission, check the transaxle bypass (freewheel).

See following video... what you need is near the end but its all good fyi.
http://husqvarna.custhelp.com/app/answers/detail/a_id/1183/related/1

There are two separate belts underneath. The upper belt goes to the hydrostatic transmission. The lower belt goes to the cutting deck. Please be sure about the belt being fine. Unless the belt is new, the belt could be stretched. The pulleys and tensioning devices will need to be inspected for wear, damage and function.

Hydrostatic Drive Problems?? - GardenWeb

forums2.gardenweb.com > Garden Forums > Tractors

May 30, 2006 - Hydro-Gear Transaxle:218-3010L I got this tractor as part of the deal when I ... After spraying the heck out of it and pressing the brake pedal down several ... I pull on the handle in the back and it moves the lever but still won't move. ..... while in the air and turning the wheels with the transmission engaged? mtd lawn tractor wont pull hills
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HYDROSTATIC TRANSMISSIONS - Small Engine Information

smallengineinformation.com/?page_id=370

The drive belt may be broken, or it may have slipped off a pulley.

Check belts. Check transmission fluid level if possible. Check linkage between shifter and transmission. Check belt tensioners under unit above deck.

Try rocking the unit by hand to get it engaged.

Try rocking the unit by hand to get it engaged.

Hello and thank you for choosing fixya. Many times when your hydrostatic transmission will not engage, it could be due to a loose, worn, or broken belt.

Check to see if your belt is still around all of your pulleys. Also, check to make sure that your belt is tight. Your mower has a bypass rod. This is the rod that you pull out, in order to release your bypass lever on your transmission, when you need to manually roll your mower. Lets make sure that this rod is fully releasing.

Double check your axles. If you have recently removed one of your rear wheels, and did not slide the square key, back into the keyway on your axle, this prevent your mower from moving when you engage your transmission.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/donald_932dff968258421f

Yes you should rotate the transmission input pulley as it is a hydrostatic transmission and only turns the oil pump in the transmission.

1) The drive belt between the engine and transmission has broken or jumped off a pulley.
OR
2) Your hydrostatic transmission is dead.

DO NOT STICK YOUR FINGERS UP INSIDE A RUNNING MOWER TO SEE IF THE DRIVE BELT IS MOVING.