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G. TUMBLER (Basket) SYSTEM
1. Tumbler (Basket) Drive Description
The tumbler (basket) is supported and driven by four (4) 11-inch diameter heavy duty rubber roller wheels.
The rubber wheels are molded onto each of four (4) steel hubs. The steel hubs are fastened to the 2-inch
diameter tumbler drive shafts by taper lock bushings. Each drive shaft is supported by two (2) 2-inch
diameter heavy duty pillow block bearings. The position of the tumbler is adjusted by moving these bearings
in or out with the four (4) bearing adjustment bolts.
There are two (2) 5 HP tumbler (basket) drive motors. Each motor drives one (1) of the 2-inch diameter
tumbler drive shafts and the motors spin simultaneously so that ALL four (4) sets of drive wheels work
together to rotate/spin the tumbler (basket).
Each motor is connected to the tumbler (basket) drive shaft by two (2) "A" type V-belts driving a shaft
mounted (5.6 to 1 ratio) gear reducer. This produces a tumbler shaft speed of 200 RPM to 205 RPM and a
tumbler speed of 315 RPM. Proper tension is maintained on the V-belt by tightening the gear reducer
turnbuckle support.
a) The oil in each gear reducer must be replaced every six (6) months by
1.4 liters I.S.O. viscosity 460
gear oil.
To keep the tumbler (basket) in the middle of the dryer, there are eight (8) 4-7/16 inch diameter retaining
wheels which stabilize the tumblers position from the front and from the back. Four (4) of these are mounted
on the front panel of the dryer (two [2] on the left and two [2] on the right). Access to these wheels is
obtained by removing the vertical front panel and rear panel covers.
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