How can i get a diagram for husqvarna model lth-150 mower drive belt?

21 hp briggs big motor

if not a drive belt or gearbox issue

is the Governor set properly
rider mower serviced regularly
carby jets adjusted
no stale fuel clean fuel filter
valve clearance to spec
newish plug
not burning oil

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

First check if drive belt is on

If you go to www.Husqvarna.com/us you can put in your model number and get an IPL or owner's manual this will show you how the belt fits on the tractor.

Parts and Diagrams for Husqvarna LTH 1742 954570376 2003 02 think this should help

Parts and Diagrams for Husqvarna 2042 LS 96043006200 2008 11 This link will provide diagrams of the drive belt and associated parts. The diagram shows the idler pulleys and tension springs. Inspect your mower to compare all drive parts to the diagram. Hope this helps....

Look in your manual. If need one, go Goggle husqvarna lth 130 manual.

Here is a copy of the manual: http://dl.owneriq.net/2/29c9af2e-b79c-43e3-9c6f-34f1230c3a64.pdf
The belt diagram for the deck is on page 53.

Here is a diagram I have found for you.