Spencer 4BOB Multistage Centrifugal Blowers - Manual (Page 17)

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• Impellers and/or deflectors worn due to age Correct abrasive conditions if present; replace impellers
or abrasion from dirty air or gas.and/or deflectors.
• Impeller(s) hitting after customer reassembly Reassemble according to instructions, tighten impellers.
and/or impeller(s) slipping shaft due to heat Bleed air at low flow to reduce heat. Change inlet
or excessive inlet pressure. conditions if necessary.
• Machine in surge (see page 8). Increase airflow.
• Keyed hubs rattling on startup. Normal condition (loose when cold, tight at operating
temperature).
• Machine running rough, out of balance. Rebalance and/or clean machine (see next topic
Machine Vibrating).
• Deflector packings rubbing on shaft or Ignore if audible only when machine is turned by hand. If
impeller hub (will seat themselves if new). otherwise audible, replace packings.
• Motor not aligned in housing (SOH) Reassemble and carefully align shaft and motor.
causing impeller to hit.
• Coupling misaligned and/or out of grease Check alignment; check coupling for wear and replace if
(4BOH & 4BOB). necessary; relubricate according to instructions.
• Foreign material in machine. Disassemble machine, inspect and clean. Reassemble
and consider installing filter to prevent clogging.
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• Abnormal hum or whine. Check motor manufacturerʼs instructions; check voltage
supply and connections.
• Low voltage, motor not up to speed. Correct improper voltage.
• High voltage (causes noise and burnout). Correct improper voltage.
• Bearing noise. See previous instructions for blower bearings.
• Loose part in motor. Tighten, repair or replace (check motor manufacturer).
• Low frequency. Correct improper frequency.
IInnddiiccaattiioonn:: m meecchhaanniiccaall ffaauulltt
• Material buildup on impellers. Clean impellers, install inlet filter to prevent further buildup.
• Shaft bent. Consult Spencer Service Department.
• Bearing failure. Replace bearing(s).
• Unbalanced replacement motor installed. Balance motor.
• Impeller failure. Replace impeller(s).
• Motor not aligned in housing (SOH & 4BOH), Align motor, realign shaft.
impeller rubbing.
• Coupling misaligned (4BOH & 4BOB). Align coupling.
• Inlet and/or discharge piping connected Install flexible connectors at inlet and discharge.
to machine without flexible connector,
causing torque or stress on housing.
• Machine bolted down, causing Remove bolts, use dowel pins or set in guide channels.
misalignment.
• Bearing(s) cramped due to improper fit. Check bearings, shaft and housing, correct bearing fit.
• Piping not adequately supported. Anchor piping properly beyond flexible connector.
• Incorrect motor voltage, causing assembly Check voltage and wiring connections, correct voltage.
to operate at improper speed.
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