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SECTION VII
COMPONENT SYSTEM DESCRIPTIONS
A. TUMBLER (BASKET) DRIVE SYSTEM
The tumbler (basket) is supported and driven by four (4) 11-inch (27.94 cm) diameter drive wheels assemblies.
Two (2) of these drive wheel assemblies are attached to a 2-inch (5.08 cm) diameter idler shaft, while the other
two (2) assemblies are attached to a 2-inch (5.08 cm) diameter drive shaft. Each of the drive wheel assemblies
are fastened to the shafts by a wheel taper lock bushing.
The idler shaft and drive shaft are each supported by two (2) 2-inch (5.08 cm) diameter pillow block bearings.
These bearings sit on slotted support channels and can be moved inward or outward by the adjustment bolts to
raise or lower the tumbler (basket).
The drive system consists of a 7-1/2 HP (5.59 kw) drive motor which is connected to the drive shaft by two (2)
A section V-belts, driving a shaft-mounted (5.6 to 1 ratio) gear reducer. This produces a tumbler (basket)
speed of approximately 31.5 r.p.m. Proper tension is maintained on the V-belts by tightening the gear reducer
turnbuckle support. The oil in the gear reducer must be replaced every six (6) months by 1.4 liters of I.S.O.
viscosity grade 460 gear oil.