JB Conversions 2307 LoMax 300 - Manual (Page 9)

17) With the original shims still in place on the stock input shaft, reverse the
process in #16 above and press the input gear back into the stock ball
bearing (Fig. 16). Before pressing the gear, use a small amount of grease
to hold the shims onto the input gear. This will keep them from dropping
onto the bearing and becoming damaged during the press.
Fig.16
18) Push the new LoMax helical drive gear onto the splines of the stock input
shaft followed by the new retaining ring. Verify 0.00”-0.003” gap below the
retaining ring. Adjust shims as necessary to achieve the proper gap (Fig.
17,17a). We recommend replacing the oil seal in the aluminum bearing
housing with the double lip seal supplied in the optional Seal & Gasket Kit.
Fig.17 Fig.17a