SOURCE: replace blades on a john deere L120 mower deck
First make sure you have the tools, metric that is. The deck must be removed and turned over. To do this you must put the deck in the lowest position. Using a 15mm socket pull the belt tension spring pulley forward to detach from clutch. Next remove retaining pins located at the five deck brackets. This will allow the arms to slide off and the deck can be dragged out from under the mower. Turn deck over. Use a 18 inch 2x4 to block blades while removing the two 15mm bolts. The bolt heads will need to be cleaned so the socket can seat on bolt head. I use my torque wrench to get more leverage and i can use it to reset blade bolts to 64 ft lbs. While blades are of it is a god time to thoroughly clean underside of deck.
SOURCE: v-belt route installed on 48" deck of John Deere LA130
http://jdpc.deere.com/pimages/PU00/PU00859________UN28APR08.gif
Copy and paste this in your address bar and it should take you to a picture of how to route the belt
SOURCE: need john deere stx38 mower deck belt diagram
Go to http://outdoorpowerinfo.com/repairs/deere_stx38_gear_drive_belt.asp
for pictures and descriptions of drive belt and deck belt on John Deere STX38 and STX46 tractor with black deck
SOURCE: i need a belt diagram for a lt166 john deere mower
From the JD site, you can get the drive and deck belt diagrams here:
http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt
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SOURCE: I need the deck belt
I fiound some beautiful pictures in a manual for the 48" mower deck by John Deere. I haven't
found the 42" diagrams yet, but I can TELL you how it goes on (or is supposed to). Loosen the sheaves (pulleys) and belt guides. The inside of beltl go on back side of each of th 2 blade pulleys. On the discharge side it will come around to the back side of smaller pulley. On left side it will come to back side of the foward pulley. Then it will go around the jacksheave on the engine shaft. Just remember, th notched side or inside of belt will always go to the v side of pulley and the back side or flat side of belt will go to the flat pulleys. Good luck
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