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Section 3 SERVICE
These serviceable items on BM&M screens may need periodic replacement.
Drive Unit
Hanger Bearings
Belt Drive
Motor
DRIVE UNIT
The BM&M screen drive unit is located in the central drive box. See drawings on
pages 24 and 25.
Procedure for removal and replacement:
1. Disconnect the power supply and tag-out for safety.
2. Remove the top screen directly above the drive box.
3. Remove the top cover:
a) remove the 3/4” bolts around the perimeter.
b) remove the three 1” bolts in the top end cap.
c) remove the 1” plug bolt in center of the top end cap.
4. Insert the longer 1” bolt in its place and use it to break the grip of the taper
fit on the top of the shaft assembly.
5. Slacken the belt drive and remove the belt.
6. Remove the four 5/8” bolts holding the drive pulley to the bearing housing
and remove the pulley.
7. Remove the four 7/8” bolts holding the rotor (counterweight) to bearing
housing and remove the rotor.
8. Remove the split ring.
9. Since the bearing is pressed onto the shaft and into the housing, the shaft,
bearing and housing must be removed as a one unit. This is known as the
Drive Unit. Remove the three 1” bolts and central 1” plug bolt on the
underside of the drive box. Insert a longer 1” bolt and use it to break the
grip of the taper fit on the bottom end of the shaft. Remove the entire drive
unit.
10. Reassembly is the reverse of the above procedure. Install a new drive unit
with the tapered end of the shaft pointing down.
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