Grain Systems Bucket Elevtors, Conveyors, Series II Sweeps PNEG-720-G2 - Manual (Page 37)

5. Assembly
PNEG-720-G2 12" and 16" Series II Sweep 37
Tractor Wheel Assembly
A. Assemble the tires to the drive axle assembly using ten (10) 7/16" lock washers and hex nuts.
(See Figure 5R.)
NOTE: Tires go on backwards as shown in Figure 5R .
Figure 5R