JB Conversions 16-1200 HD Standard Length SYE Kit for the NP231 - Manual (Page 5)

5
7) Lift the entire mainshaft assembly, chain, and front output shaft out
of the case as an assembly (Fig.5 & Fig.6).
FIG: 5 FIG: 6
8) Using flat-head snap ring pliers, remove the large retaining ring
holding the hub to the mainshaft (Fig.7).
FIG: 7
9) Apply a liberal amount of oil to the sprocket area of the new
mainshaft. Install the hub and sprocket assembly onto the new main
shaft (Fig.8). If your sprocket has needle bearings located within the
main bore, press them out and discard. It is acceptable to delete these
bearings. The deletion of these bearings is per factory, NVG design. Be
sure the retaining ring is fully seated in the groove on the shaft
(Fig.9).