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Adjustments
49
70420801 (EN)
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. T he 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 tumble d ryer
before attempting any adjustments to the dr ive
assembly.
2. Loosen pulley mounting plate bolts.
3. Loosen the upper nut on the final drive eyebolt.
4. Rotate the lower nut of the final drive eyebolt
clockwise until proper belt tension is achieved.
5. Rotate upper nut clockwise against the lower nut
in order to lock it into place.
6. Tighten pulley mounting plate bolts. Recheck
belt tension.
7. If necessary, adjust the drive motor belt tension
eyebolt using a similar procedure.
8. Adjust blower belt tension on 120 pound
50 Hertz tumble dryers and all 170 pound tumble
dryers using a similar procedure.
NOTE: Proper tensions for new belts are
45-55 pounds for the motor belt, 55-65 pounds for
the final drive, 60-65 pounds for 120 pound blower,
and 75-80 pounds for 170 pound blower measured
with a Borroughs Belt Tension Gauge. Using a
Browning Belt Tension Gauge, the motor belt
deflection should be 0.31inch at five pounds
pressure, and final drive belt deflection should be
0.25 inch at five pounds pressure.
Belts should not slip or make any noise when sta rting
up under normal load.