Spencer 4BOB Multistage Centrifugal Blowers - Manual (Page 16)

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• Incorrect rotation. Change motor leads to correct rotation.
• Air or gas lines too small, causing Increase line sizes or install machine with higher output
excessive friction loss. pressure.
• Machine reassembled incorrectly in field. Disassemble machine and reassemble correctly.
• Valves in line not fully open or check Open valves or inspect check valve.
valve improperly installed.
• Inlet, discharge or piping system Remove obstructions, clean filter.
partially blocked.
• High inlet temperature. Position inlet in a cooler area.
• Low inlet pressure. Check inlet for obstructions or install machine with higher
discharge pressure.
• Machine not running at design speed. Refer to motor manufacturerʼs instructions; check motor
speed; check voltage connections.
• Low gas density or specific gravity. Check gas analysis and increase density or install
machine designed for prevailing conditions.
• Machine air passages clogged. Disassemble, clean and inspect all parts.
• Impellers damaged by explosion, Replace impellers.
abrasion or vibration.
• Inlet spiral has rotated, partially blocking Rotate spiral to correct position and pin or clamp in
inlet (4BOB only). position.
• Pressure or vacuum gauge inaccurate. Calibrate gauge; always use a “U” tube manometer for
checking pressure and/or vacuum.
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• System requirements incorrectly calculated Install larger volume or lower pressure machine to handle
by customer. system requirements.
• System leaks or too many openings. Locate and repair leaks; reduce number of openings.
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• Flowmeters calibrated incorrectly. Calibrate flowmeters; use proper orifice for meter (check
with flowmeter manufacturer).
• No means of measurement available. Obtain and install flowmeter.
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• Too much grease, bearings hot. Remove excess grease. Check bearing temperature;
refer to lubrication instructions in this manual.
• Too little grease, bearings dry. Grease according to instructions.
• Bearing failure. Replace bearing(s).
• Bearing retainers worn. Replace bearing(s).
• Bearing turning on shaft, retaining nut loose. Tighten nut, check for damage.
• Bearing turning in housing, housing worn. Replace housing and bearing.
• Bearing replaced incorrectly, particularly in Follow installation instructions carefully; check bearing,
tandem assembly (e.g., angled, cramped shaft and housing dimensions.
or reversed).
• Bearing(s) overloaded—too much thrust Replace bearing(s); reduce thrust by lowering air or gas
due to high density air or gas. density; install smaller impellers or install machine
designed for application conditions.
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