American Dryer Corp. AD-400 User Manual
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3. Tumbler or Basket drive system
There are two (2) 5 hp tumbler drive motors. Each motor drives one of the 2-inch diameter tumbler drive
shafts, and the motors spin simultaneously so that all four (4) drive wheels work together to spin the
tumbler.
Each motor is connected to the drive shaft by two (2) "A" section V-belts, driving a shaft-mounted (5 to 1
ratio) gear reducer. This produces a tumbler shaft speed of 200 to 205 rpm and a tumbler speed of 315
rpm. Proper tension is maintained on the V-belts by tightening the gear reducer tumbuckle 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. Tumbler retaining wheels
There are eight (8) 4-7/16 diameter retaining wheels which stabili
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e the tumbler's position from front to
back. Four (4) of these are mounted on the front panel of the dryer (two [2] on the left side and two [2] on
the right side), and four (4) are mounted on the rear panel (two [2] on the left side and two [2] on the rigjit
side). Access to these wheels is obtained by removing the vertical front and rear panel covers.
5. Servicing the drive system
a. Removing a Drive Wheel
The drive wheels are removed through the front and back panels of the dryer, not through the
sides. The front 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 may 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.
Front Panel Electrical Connections.
1. Front Door Position Switch Disconnect Plug; The front door position switch disconnect plug is
located on the left side of the front doors. Disconnect this plug and feed the cable through the
right hand side of the tumbler section
2. Intake Tempjerature Probe Disconnect Plug: The intake temperature probe disconnect plug is
located in the bumer/heater section, just above the 25Hp motor. Disconnect this plug and route
through the hole located on the right of the front panel.
Rear Panel Electrical Connections.
1. Rear Panel Controls Disconnect Plug; The rear panel controls disconnect plug is located
behind the rear panel controls. Disconnect this plug and feed through hole towards the left hand
drum motor section.
2. Rear Door Position Switch Disconnect Plug: The rear door position switch disconnect plug is
located on the left side of the rear doors. Disconnect this plug and feed the cable through the
right hand side of the tumbler section.
Put a block of wood under the tumbler; loosen and back out the tumbler shaft support bearings
so that the drive wheel lines up with the large hole in the frame. The drive wheel taper lock
bushing can now be loosened and removed through the hole in the frame, and the drive wheel
pulled out of the dryer through this hole. Before backing out the tumbler shaft bearings, mark
their position on the frame to make reassembly easier.
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