Need a manual for a rz4623 - Husqvarna Rz4623 46" Ztr Lawn Mower Zero Turn 23hp Kohler Engine

Check the leftside manual transport bypass lever has not somehow engaged. Compare it to the right side.

The two transaxles are driven by the same belt so extremely unlikely it's a belt problem.

Look for any signs of fluid leaking from the left transaxle shaft seal. If the seal has been leaking then it may be low on fluid. The transaxles are considered maintenance free so there are no instructions from Husqvarna for adding fluid but it can be done. However, if the shaft seal is leaking it will need replaced.

See operators manual regarding bypass levers (rods).

https://www.manualslib.com/manual/74128/Husqvarna-115-127127-Ir.html

RZ4623?

https://www.manualslib.com/products/Husqvarna-Rz4623-966678201-2304890.html

pg. 58

Hi Willard, The link below is a web page with the diagram for your lawn mower.......CHEERS..
Diagram of drive belt for husqvarna rz4623 Google Search

still plenty of parts available,the dimensions arent included,but you can find cheaper belts,just dont use an automotive belt,they wont last through 1 mowing,get the ones with kevlar,they r more expensive but,will last for a long time, Husqvarna Drive Belt Part 539117245

https://www.bing.com/search?q=husqvarna+539117245&PC=U316&FORM=CHROMN

your complete parts manual,,, Husqvarna RZ4623 Ride On Mower Parts

Check your blade belts.

V-belt Husqvarna part number is: 539117245 - about $50
No size is given.

Here is diagram: http://www.ereplacementparts.com/husqvarna-rz4623-ride-mower-parts-c-114486_117796_205921.html

If you a push button. A new switch

Not sure the problem, there are no gears on the drive system. This uses Hydro drive wheel units. If the belt is on and in good shape, check the lever linkage.

Under the flywheel