EMPLOYEE STATED THAT HE WAS INSTALLING A REAR TIRE ON A WA600 LOADER USING THE OVERHEAD CRANE. THE TIRE SWUNG AROUND AGAINST A METAL STAND. THE EMPLOYEE'S LEFT LEG GOT CAUGHT BETWEEN THE METAL STAND AND CONCRETE WALL CAUSING A MASHING INJURYTO HIS LEG. BECAME REPORTABLE ON 8-9-01 DUE TO INCURRING LOST WORK DAYS.