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TROUBLESHOOTING <br />Trouble <br />Item <br />Possible Cause <br />Remedy <br />No flow <br />1 <br />Speed too low <br />Check by tachometer and compare with published <br />performance <br />2 <br />Wrong rotation <br />Compare actual rotation with Figure 1 or 2 <br />Change driver if wrong <br />3 <br />Obstruction in piping <br />Check piping, valves, silencer to assure open flow path <br />Low capacity <br />4 <br />Speed too low <br />See item 1, If belt drive, check for slippage and readjust <br />tension <br />5 <br />Excessive pressure rise <br />Check inlet vacuum and discharge pressure and compare <br />with Published performance <br />6 <br />Obstruction in piping <br />See item 3 <br />7 <br />Excessive slip <br />Check inside of casing for worn or eroded surfaces causing <br />excessive clearances <br />Excessive power <br />8 <br />Speed too high <br />Check speed and compare with published performance <br />9 <br />Excessive pressure rise <br />See Item 5 <br />10 <br />Impeller rubbing <br />Inspect outside of cylinder for high temperature areas, then <br />check for impeller contact at these points. Correct blower <br />mounting, drive alignment <br />11 <br />Scale, sludge, rust <br />Clean blower appropriately <br />or product build up <br />Overheating of <br />12 <br />Inadequate lubrication <br />Check oil sump levels in gear and drive end headplates <br />bearing or gears <br />13 <br />Excessive lubrication <br />Check oil levels. If correct, drain and refill with clean oil of <br />recommended grade <br />14 <br />Excessive pressure rise <br />See Item 5 <br />15 <br />Coupling misalignment <br />Check carefully. Realign if questionable <br />16 <br />Excessive belt tension <br />Readjust for correct tension <br />Vibration <br />17 <br />Misalignment <br />See Item 15 <br />18 <br />Impellers rubbing <br />See Item 10 <br />19 <br />Worn bearings/gears <br />Check gear backlash and condition of bearings, and replace <br />as indicated <br />20 <br />Unbalanced or rubbing <br />Scale or process material may build up on casing and <br />impeller <br />impellers, or inside impellers. Remove build-up to restore <br />original clearances and impeller balance <br />21 <br />Driver or blower loose <br />Tighten mounting bolts securely <br />22 <br />Piping resonances <br />Determine whether standing wave pressure pulsations are <br />present in the piping <br />23 <br />Scale/sludge build-ups <br />Clean out interior of impeller lobes to restore dynamic <br />balance <br />24 <br />Casing strain <br />re -work piping alignment to remove excess strain <br />Driver stops, or <br />25 <br />Impeller stuck <br />Check for excessive hot spot on headplate or cylinder. <br />will not start <br />See item 10. Look for defective shaft bearing and/or <br />gear teeth <br />26 <br />Scale, sludge, rust or <br />Clean blower appropriately <br />product build-up <br />Excessive breather <br />27 <br />Broken seal <br />Replace seals <br />Blow-by or excessive <br />28 <br />Defective O-ring <br />Replace seals and 0 -ring <br />oil leakage to vent area <br />9 ©2002 Dresser, Inc. all rights reserved. <br />ROOTS, RAM. URAI and MISPAIR are trademarks of Dresser, Inc. <br />r)--, n—i— — 1 i—„e. oni—.m.rdcr tre Ac Uo 'f n.no Inn <br />