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EQUAL HANGER LOADING
Equal hanger loading is critical for smooth running, long machine life and minimal
vibration of the support structure. Improperly loaded hangers can throw the
machine out of balance and may cause severe damage to the hangers or
supporting structure.
The following procedure will ensure equal loading:
1. Ensure the machine is bolted down.
2. Completely loosen the nut at the lower end of one hanger until that
hanger does not support any weight of the screen.
3. Draw a plan view of the screen and mark down measurement “X”
between the end of the hanger and the hanger support bracket as
shown on the illustration on page 6. Use the provided shim stock to
measure this gap. Tighten the hanger bolt to 250 ft-lbs.
4. Do the same for the other three hangers one at a time, marking down
each gap measurement “X” on your drawing. Note that the
measurements across the diagonals should be very similar.
5. Subtract the smallest measurement from the largest measurement. If
this difference is less than 0.025” the machine is balanced. If not, the
machine must be shimmed.
Shimming:
To find the correct shim size to use, take the difference obtained in Step 5
and divide it by 2. Place this size of shim (nearest sized shim or
combination of shims to get the nearest size) in the gap of the hanger with
the largest measurement and tighten the hanger nut back up. Run the
machine for 3 to 4 minutes and then shut the machine off, allowing it to
come to rest.
Repeat Steps 1 to 4 using a new plan view diagram. However, when
recording the gap measurement for the shimmed hanger, leave the shim
in the gap and record the distance between the end of the hanger and the
top of the shim. Always use shim stock to measure the gaps.
Note: Only one corner should require shimming.
If the gap above the shim has become larger than the previously
un-shimmed gap, remove shim and repeat all steps.
If the machine is still not balanced, contact BM&M for assistance.
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