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Adjustments
Belt Drive
The drive assemblies consist of motors, belts, eyebolts
and a step pulley.
The pulley diameters are sized to produce a cylinder
speed of 37-39 RPM for 120 pound models or
29-31 RPM for 170 pound models.
The step pulley assembly is used for speed reduction
as well as a means of adjusting belt tension. The pulley
mounting plate is attached to the cabinet. The frame
mounting plate has vertically slotted holes allowing up
and down movement of the step pulley mounting plate
for belt adjustment.
Adjust the belt tension as follows:
1. Disconnect electrical power to the tumbler before
attempting any adjustments to the drive assembly.
2. Loosen the upper nut on the final drive eyebolt.
3. Rotate the lower nut of the final drive eyebolt
clockwise until proper belt tension is achieved.
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4. Rotate upper nut clockwise against the lower nut
in order to lock it into place.
5. If necessary, adjust the drive motor belt tension
eyebolt using the same procedure as steps 1-4.
6. Adjust blower belt tension on 120 pound
50 Hertz tumblers and all 170 pound tumblers
using the same procedure as in steps 1-4.
NOTE: Proper tension for new belts is
45-55 pounds for the motor belt and 55-65 pounds
for the final drive, measured with a Borroughs Belt
Tension Gauge. Using a Browning Belt Tension
Gauge, the motor belt deflection should be
5/16 inch at five pounds pressure, and final drive
belt deflection should be 1/4 inch at five pounds
pressure.
Belts should not slip or make any noise when starting
up under normal load.
M414038
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