【正文】 ing down height of suction.c. Adjust discharge valves so as that flow of pumps goes into the prescribed limit.d. Reduce the leakage of air.e. Bring down the temperature of slurry.(1) Appearance of faultyPumps vibrate violently.(2) Analysis of reasona. Cavitation happens.b. Expellers are blocked up.c. The shaft of pump and the shaft of motor are not concentric.d. Fastening parts or foundation bees flexible.(3) Processing measurea. Bring down height of installation. Lessen the resistance of suction pipeline.b. Clean the impellers.c. Readjust central line again.d. Fasten anchor nuts and reinforce ground.(1) Appearance of faultyBearings have a fever.(2) Analysis of reasona. Cooling water cocks are not opened.b. Bearings cannot be lubricated normally.c. Lubricant oil is not clean.d. The installation direction of thrust bearing is not proper.e. Quality of bearing is not up to standard.(3) Processing measurea. Turn on cooling water.b. Adjust oil level according to specification instructions.c. Clean bearings and replace lubricant oil.d. Determine installation direction of bearing according to direction of pressure.e. Change bearings.Appearance of faultya. Excessive leakage from stuffing box.b. Packing was burned down.(2) Analysis of reasona. Packing worn.b. No watersealing(3) Processing measurea. Replace new packing.b. Open the watersealing(1) Appearance of faultyOil is leaked from pump.(2) Analysis of reasona. Oil level is too high.b. Seal parts loss efficacy.c. Pumps are assembled unreasonably.(3) Processing measurea. Bring down oil level.b. Exchange seal parts.c. Reassemble pumps.(1) Appearance of faultyWater is leaked from pump head.(2) Analysis of reasona. There are questions in rubber parts.(3) Processing measurePress rubber parts or reassemble pumps.Ⅴ MAINTENANCE AND DISMOUNTING OF PUMPS In order that ZJ series pumps operate safely and play to strong points, maintenance and way of disassemble amp。 assemble is important. According to the feature of the ZJ series pumps, we establish the requirement of maintenance. When the pump is working, must ensure that the packing are installed.1. MaintenanceThe ZJ series pumps have been adjusted before delivery. During 6 months after purchasing customers need not take apart pumps. Before using pumps, we should examine the flexibility of rotation and add lubricant oil.⑴ Keep facilities clean、dry、without dirties and leakage. ⑵ Examine oil level in support every day, its deviation from the oil level of support is 177。2 mm⑶ Examine operation、vibration and leakage every day. We must solve them in time when we find problems.⑷ No operating when pumpout. When operating on that condition, pumps will vibrate violently and reduce service life.⑸ Metal body and big block, which cannot pass through pumps, must not enter pumps, neither do rubbers, plastics, and cottons, lest wet parts are damaged and stopped up so as to operate abnormally.⑹ We should check up flow and pressure of shaft seal water and cooling water and oil by examining position of valves and taking their temperature of stuff box. Higher temperature shows short of water. ⑺ Examine leakage of shaft seal water regularly. When leakage bees big we should adjust bolts of stuff cover and exchange stuff in time.⑻ Assembly of the packing① The packing length should be accord with sleeve circle, and from the direction of shaft, joints of the adjacent packing rings crossed 120176。. ② After packing, test run with supplying water, meantime, adjust gland bolts carefully to make the leakage be drop not line. Packing is very important to be pay attention to, it not only related state of seal, but also affect performances of pump.⑼ In order to make pumps operate efficiently we must adjust the interval between impeller and front liner so as that it is between mm. The interval has been adjusted before delivery. You can stop pump and adjust it if you find it isn39。t up to mustard or you find problem in pump39。s work. Adjust them as following.① Undo nuts of support cover.② Undo adjustable bolt screws.③ Tighten nuts of bearing box averagely so as that rotor moves to pump head until rotor cannot rotate. Attention: direction of winding impellers should be in accordance with work direction.④ Measure the interval (δ=a) between flange of bearing box and end face of support. Now the interval between impeller and front line is zero.⑤ Undo nuts of bearing box.⑥ Tighten adjustable screws averagely so as that rotor moves to motor. Check up the interval until it is equal to a+(). Attention: ensure the rotor stated firmly.⑦ Tighten nuts of bearing box in order to fix rotor in axial direction.⑽ Examine temperature of bearings and ensure it lower than 75℃.⑾ Exchange lubricating oil after pumps operate for 800 hours running.⑿ Auxiliary pumps rotate the quarter circle weekly so as that shaft of pumps bears static load and vibration of base evenly.⒀ If auxiliary pumps are not operating for a long time, we should clean sediment with water before running pumps.⒁ Examine supporting mechanism of pipeline regularly so as that supporting is reliable and body of pump does not bear supporting force.⒂ Examine fastening parts of base frequently in order that fasting is reliable.⒃ Pins can be set up after testing rotor direction of rotation for pumps assembled just now and repaired. Belts can be set up after testing motor direction of rotation when pumps are drove by belts. Pumps must not rotate oppositely. When motors are loss of power, slurry in pipeline can make impellers rotate oppositely. But when head of pump is above 80m, we should prevent slurry from flowing back lest pumps rotate oppositely.⒄ Before starting pumps, we should switch on shaft seal water and cooling water. After stop pumps for 15 minutes, we switch off shaft seal water and cooling water.2