Installation Operation and Maintenance Manual

Symptom Cause RemedyThere is excessive leakage The packing gland is not adjusted properly. Tighten the gland nuts.from the stuffing box.The stuffing box is not packed properly. Check the packing and repack the box.The motor requiresexcessive power.The mechanical-seal parts are worn.The mechanical seal is overheating.The shaft sleeve is scored.The discharge head has dropped below therated point and is pumping too much liquid.The liquid is heavier than expected.The stuffing-box packing is too tight.Rotating parts are rubbing against each other.The impeller clearance is too tight.Replace the worn parts.Check the lubrication and cooling lines.Machine or replace the shaft sleeve as necessary.Install a throttle valve. If it does not help, then trimthe impeller diameter.If this does not help, then consult an ITTrepresentative.Check the specific gravity and viscosity.Readjust the packing. If the packing is worn, thenreplace the packing.Check the parts that are wearing for properclearances.Adjust the impeller clearance.Troubleshooting (Continued)Alignment troubleshootingSymptom Cause RemedyHorizontal (side-to-side) alignment cannotbe obtained (angular or parallel).The driver feet are bolt-bound.The baseplate is not leveled properly andis probably twisted.Assembly troubleshootingSymptom Cause RemedyThere is excessive shaft end play.The internal clearance of the bearingsexceeds the recommended amount.The snap ring is loose in the bearinghousinggroove.Loosen the pump's hold-down bolts, andslide the pump and driver until youachieve horizontal alignment.1. Determine which corners of thebaseplate are high or low.2. Remove or add shims at theappropriate corners.3. Realign the pump and driver.Replace the bearings with a bearing ofthe correct type.Re-seat the snap ring.There is excessive shaft and sleeve runout. The sleeve is worn. Replace the sleeve.There is excessive bearing-frame flangerunout.The shaft is bent.The shaft is bent.Replace the shaft.Replace the shaft.The flange of the bearing frame is distorted. Replace the bearing-frame flange.There is excessive frame-adapter runout. There is corrosion on the frame adapter. Replace the frame adapter.There is excessive seal chamber or stuffingboxcover runout.There is excessive vane-tip runout of theimpeller.The adapter-to-frame gasket is not seatedproperly.The seal chamber or the stuffing-box coveris not properly seated in the frame adapter.There is corrosion or wear on the sealchamber or stuffing-box cover.The vane is bent.Re-seat the frame adapter and makesure that the adapter-to-frame gasketis seated properly.Re-seat the seal chamber or stuffingboxcover.Replace the seal chamber or stuffingboxcover.Replace the impeller.Model 3796 i-FRAME Installation, Operation, and Maintenance Manual 117