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3. Tumbler and Basket Drive System
There are two (2) 5 HP (3.73 kw) tumbler drive motors. Each motor drives one of the 2-inch (5.08 cm)
diameter tumbler drive shafts, and the motors spin simultaneously so that all four (4) sets drive wheels work
together to spin the tumbler (basket).
Each motor 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 shaft speed of 200 RPM to 205 RPM and a tumbler (basket)
speed of 31.5 RPM. Proper tension is maintained on the V-belts by tightening the gear reducer turnbuckle
support. The oil in each gear reducer must be replaced every six (6) months by 1.4 liters of I.S.O. viscosity
Grade 460 gear oil.
4. Servicing the Drive System
a. Removing a Drive Wheel
The drive wheels a removed through the front and back panels of the dryer, not through the slides. The
front loading door and back loading door panels are hinged at the top. Remove the bolts holding these
panels to tumbler section frame and swing the panel out. The two (2) 1/4-inch poly-flo tubes connected
to the load door piston have to be removed to allow the panel to swing up far enough out to get access to
the drive wheels. Likewise, the following electrical disconnections must be performed (refer to page
31).