The oil-bath system features back-to-back tapered roller bearings operating in 90W gear oil and sealed with Duo-Cone TM seals. The gang shaft is slipped through the bore of the interior axle (yellow). Bearings and seals are mounted on the interior axle (yellow) and neither the bearings nor seals are in direct contact with the gang shaft.
Half spools (red) are pressed onto either end of the interior axle. The half spools bottom out against the ends of the interior axle and, therefore, the interior axle carries the compression forces when the gang is tightened.
Pressure against the half spools is transmitted to the seal retainers (white) and thereby to the Duo-Cone TM seals. The bearing pre-load is set through the use of gaskets between the bolt-on end cap (green) and the housing (blue).
The oil-bath bearing is available in three sizes:
1-5/8" (41 mm)
The 1-5/8" gang axle is used on models 155.
2-1/8" (54 mm)
The 2-1/8" gang axle is used on models 225, 225TSW, 225DOW, 275, 275F & 275DR.
2-1/2" (64 mm)
The 2-1/2" gang axle is used on models 325,400, 500, 600 & 800.