Misaligned couplings

Loose or broken parts

Excessively worn gears

Worn or faulty bearings

Low liquid level or excessive forces in tank

Excessive backlash or shaft end play

Recheck Alignment

Check for breaks or cracks. Tighten all bolts.

Check shimming for proper contact. Check possible machine overload. Keep oil clean. Replace gears if necessary.

Check alignment, adjustment and possible overload. Clean and flush reducer, replace worn bearings and add new lubricant as required.

Turn mixer off and return tank level to 2' above lower impeller before resuming operation.

Check for worn bearings, gears and proper shimming.

Excessive churning of oil in operation

Obstructed air flow

Unit operating over thermal rating

Drain excessive oil to proper level.

Check air supply for proper motor fan circulation. Avoid high surrounding ambient temperatures.

Check rating with actual load.

Worn or damaged oil seals

Too much oil

Improper venting

Foaming oil

Replace with new seals. Avoid inserting seal over sharp edges.

Check oil level. Drain to proper capacity

Replace clogged breathers.

Replace oil with proper type (non-foaming)

Misaligned coupling

Bent shaft

Low liquid level or excessive forces in tank

Worn or failed gearbox bearings

Loose, bent, or missing impeller blade

Critical Speed

Tighten all bolts

Loosen all bolts, align, tighten all bolts.

Straighten or replace shaft

Turn mixer off and return tank level to 2" above impeller before resuming operation

Replace bearings.

If loose, replace and tighten all bolts. If blade is missing or bent, replace blade with proper size and type.

Operate at a different speed outside of the critical speed zone.