The fault comparison table of common machinery and equipment for sewage treatment is very practical!

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Table of Contents

1. Common faults and troubleshooting methods of reducer

Fault phenomenon	Cause of the failure	Solution:
vibration	The transmission is misaligned The connector is loose, and the mating accuracy is broken Disruption of the dynamic balance	Check and adjust the alignment of the unit Tighten the loose bolts Check the rotor balance
Excessive noise	Poor lubrication Poor gear mesh The matching accuracy of each part is reduced, and the wear is serious	Check to change the lubricating oil Check and adjust the gear mesh Check and adjust the accuracy of each fit
Leaking seals	Shaft seals and machine seals are worn The oil level is too high Damage to bearings or journals	Replace shaft seals and machine seals Adjust to the required oil level Replace the shaft or bearing
High bearing temperature	Increased bearing wear clearance Excessive or too little lubricating oil The lubricating oil is not of good quality or contains impurities Loose bearings	Adjust or replace bearings Adjust the amount of oil to the appropriate level Replace the qualified oil Adjust and tighten the housing

2. Common faults and troubleshooting methods of motors

Common faults	Cause of the failure	Solution:
The motor does not start or does not meet the rated parameters	1. The fuse in the fuse is blown off, one of the switches or power supply is in the disconnected state, and the power supply voltage is too low 2. There is a broken wire in the stator winding 3. The winding and its external circuit have open circuits, poor contact or solder joint desoldering. 4. The connection that should be connected to the "Δ" wiring is "Y", so it can be started without load, but not at full load. 5. The motor is too large, or there is a stuck fault in the driven machinery	1. Check the working condition of the power supply voltage and switch 2. Check the stator winding with a megohmmeter 3. Use a megohmmeter to check whether there is an open circuit in the rotor winding and its external circuit, and check whether the connection points are in close contact and reliable. 4. Wiring according to the correct method. 5. Check the load driven by the motor
The initial sound of the motor start-up is loud, the starting current is large, and the three currents are very different	One of the six leads in the three windings starts and ends in reverse	Adjust the wiring
Three currents are unbalanced	1. The three power supplies are unbalanced 2. There is a short circuit in some coils in the stator winding 3. After the overhaul, the number of turns of some coils is wrong 4. After overhaul, there are errors in the wiring of some coils	1. Measure the power supply voltage 2. Measure three currents 3. The DC resistance of each coil winding can be measured with a double-arm bridge 4. Change the wiring according to the correct wiring method
The bearing is overheated	1. The bearing is damaged 2. The shaft and the bearing fit are too tight or too loose 3. The bearing and the end cover fit too tightly or too loosely 4. Correct mounting part 5. Too much or too little lubricating grease or bad grease 6. The end covers or bearing covers on both sides are not flattened	1. Replace the bearing 2. Re-process when it is too tight, and spray plating of the shaft when it is too loose. 3. Reprocess when it is too tight, and set the end cover when it is too loose 4. Reassembly 5. Add an appropriate amount of lubricating oil or change the oil 6. Assembly adjustment
The ammeter pointer swings back and forth during operation	1. The one-phase brush or short-circuit piece of the winding rotor has poor one-phase contact 2. The winding rotor is broken in one phase 3. The cage rotor is broken	1. Adjust the brush pressure or grind the brush and collector ring 2. Repair or replace short-circuit pieces 3. Check the short circuit point
The case is electrified	1. Ungrounded or poorly grounded 2. The winding is damaged by moisture insulation.	1. Connect the ground wire according to the regulations 2. Dry or replace insulation to remove stolen goods
The no-load current is large	1. The power supply voltage is too high 2. Corrosion or aging of silicon steel sheets 3. The number of turns of the stator coil is not enough or the Y shape is connected into a triangle.	1. Adjust the voltage; 2. Overhauling the iron core; 3. Rewind the stator or correct the wiring
The motor has abnormal vibration and ringing	1. The foundation is uneven or the assembly is not good 2. The gap between the motor journal and the bearing of the sliding bearing is too small 3. Poor assembly of rolling bearings or defective bearings 4. The rotor of the motor and the pulleys and gears attached to the shaft are not well balanced 5. Deformation of the rotor core and bending of the shaft 6. There is a local short-circuit fault in the winding rotor winding 7、定子铁芯硅钢片压得不紧	1. Check the foundation and motor installation 2. Check the condition of the sliding bearing 3. Check the rolling bearing or replace it 4. Adjust the balance 5. Align or replace the rotor 6. Measure the open-circuit voltage of the rotor 7. Drill holes and reinforce bolts in the stator core outside the base
The electrons overheat in whole or locally	1. The motor is overloaded 2. The power supply voltage is too high or too low 3. The insulation between the silicon steel sheets of the stator core is poor or the core is burr 4. When the rotor is running, it rubs against the stator and causes the stator to overheat 5. The cooling effect of the motor is not good 6. There is an open circuit or ground fault in the stator winding 7. The motor of the coil is replaced due to the wrong wiring or wrong number of turns 8. Lack of phase 9. Poor contact or desoldering	1. Reduce the load or change to a large motor 2、2、Adjust voltage -5--+10% 3. Overhaul the stator core 4. Check whether the rotor core is deformed, whether the shaft is bent, whether the end cover is too loose, and whether the bearing is worn 5. Check the direction of fan rotation and whether the fan falls off 6. Measure the DC resistance of each coil and the insulation of the components 7. Check and correct 8. Check the three-phase power supply voltage and winding separately 9. Check the welding point

3. Common faults and troubleshooting methods of lifting equipment

failure	Primary Causes	Exclusion Method
The braking is unreliable, and the gliding distance exceeds the specified requirements	Due to large wear of the brake ring or other reasons, the spring pressure is reduced	Adjustments and replacements
Poor contact between the brake ring and the cone of the rear end cap	Overhaul and grinding
There is oil stain on the brake surface	Remove and wash
Pressure spring fatigue	replacement
The coupling is moving, inflexible or stuck	Inspect the connections
The trodging momentum of the conical rotor is excessive	adjust
The running gear does not work	The motor is damaged	Repair or replacement
The walking wheels are worn and damaged	Repair, adjustment or replacement
There is debris on the walking tracks	purge
The installation error of the walking wheel is too large, and it rubs or collides with the track	Adjustments, repairs, or replacements
The traveling gear vibrates or is noisy	Coupling clearance is too large or uneven	Realignment
The gap between the conical rotor and the stator of the motor is too small, and friction occurs	The support ring on the motor is severely worn: axial displacement of the rotor core, or displacement of the stator core	Disassemble and replace the support ring to make the gap between the rotor and the stator cone even, and the gap is generally 0. 35－0.55。 or return to the factory for repair
The reducer is leaking	Shaft end seals are poorly assembled or damaged by failure	Replace the seal
Loose bolts	Tighten the bolts
Excessive refueling or oil spoilage	Refuel and replace according to regulations
You can't stop after starting or when you reach the limit position	The AC contactor is electrocuted and melted	replacement
The limiter is out of order	Repair or replacement
In the limiter, the line is connected incorrectly	Overhaul limiter wiring

Fourth, square (round) copper inlaid gate, adjusting weir door common faults and troubleshooting methods

failure	Primary Causes	Exclusion Method
divulge	The gap between the sealing faces is too large	adjust
The sealing surface is damaged	Repair or replacement
Foreign body entrapment	purge
Closure is not in place	Repair or replacement
Reverse compression failure	Fixes or adjustments
The lead screw is worn, bent and broken	The material of the lead screw is unqualified	replacement
Improper maintenance	Repair or replacement
The limiter is out of order	Repair or replacement
Hard objects are jammed	Clear, repair, or replace
Excessive force when manual	Repair or replacement
There is debris on the lead screw	purge
The hoist leaks and is damaged	The seal is poorly equipped or damaged by failure	Overhaul and replace the seals
The gap between the sealing surfaces is too small, and the load is too large	Adjustments, repairs, or replacements
damage	replacement

5. Common faults and troubleshooting methods of valves

failure	Primary Causes	Exclusion Method
The valve cannot be fully opened or completely Shut down	There is a foreign object jamming at the valve ram	purge
The opening limiter does not match the rotation angle of the valve ram	Realignment
The pressure difference between the two sides of the valve is too large	Use a bypass valve or other means to relieve pressure
The stopper is damaged	Repair or replacement
Leakage from the outside of the valve	Poor or failed sealing rings between the flanges	Reinstall or replace
There is a gap between the flanges	Reinstall
The motor does not work	The motor is damaged	Repair, replacement
The voltage is missing or the line is connected incorrectly	repair
The motor is damp with water	Dry, repair or replace
The reducer is damaged	The reducer enters the mud and other debris	Cleaning, oil replacement, repair or replacement
Excessive wear of gears and excessive clearance between teeth	Repair, replacement
Bearing damage	replacement
Reducer Oil spills	Shaft end seals are poorly assembled or damaged by failure	Replace the seal
Loose bolts	Tighten the bolts
Excessive refueling or oil spoilage	Refuel and replace according to regulations

Sixth, the common faults of the grille and the elimination method

failure	Primary Causes	Exclusion Method
Slag removal is not ideal	The rake, the rake, the harrow, and the rake are not in place	adjust
The levelness error of the rake bucket and rake teeth is too large	Realignment
Rake bucket and rake teeth are worn	Repair or replacement
The installation angle of the grille machine is too large	Realignment
The grille strip is damaged	Repair or replacement
There are debris on the track, and the rake bucket and rake teeth are deviated	purge
The installation error of the walking wheel is too large, and it rubs or collides with the track	Adjustments, repairs, or replacements
The walking wheels are damaged, so that the rake bucket and rake teeth are deviated	replacement
There is an abnormality sound	There is jamming when the rake bucket and rake teeth move	Adjustments, fixes
Bearing damage	replacement
There is too much sediment at the bottom of the drum grille	purge
The installation error of the walking wheel is too large, and it rubs or collides with the track	Adjustments, repairs, or replacements
Coupling clearance is too large or uneven	Realignment
There is debris on the walking tracks	purge
Wire rope or chain damage	Lack of maintenance	Add grease or replace
Prolonged wear and tear	Repair or replacement
Chain tripping	replacement
The uneven force on both sides causes unilateral wear	Adjustments, repairs, or replacements
The grille machine vibrates too much	Coupling clearance is too large or uneven	Realignment
The horizontal error of the drum grille is too large	Realignment
There is debris on the walking tracks	purge
The installation error of the walking wheel is too large, and it rubs or collides with the track	Adjustments, repairs, or replacements
The reducer is not working properly	See the judgment of reducer failure
The motor is not working properly	See the judgment of motor failure

7. Common faults and troubleshooting methods of swirl grit remover tank

failure	Primary Causes	Exclusion Method
The propellers are not installed	Lack of power	Inspect the motor and reduction gear
Failure of the drive	Check the big gear
When the air stripping system is working, the grit is not lifted	The blower does not have the required air pressure	Check the air pressure, check the air pressure is low, and check the setting of the air release valve. The fan is not working, check the power supply
There is no air ejected from the gas tube	Air troubleshooting valve or not opening
The gas pipe is clogged
No sand discharge, sand discharge pipe blockage	purge

8. Common faults and troubleshooting methods of scraping (suction) sludge machine:

failure	Primary Causes	Exclusion Method
motor failure	See the judgment of motor failure
Reducer failure	See the judgment of reducer failure
The steel components of the scraping (suction) mud machine are shaken, deformed and damaged	Excessive slag accumulation and excessive load	purge
The connector is loose	Check, readjust, repair
There is friction and collision during movement	Check, readjust, repair
往复刮（吸）泥机限位器失灵	Inspect, readjust, repair, or replace
The bottom of the pool is blocked by a large hard object	purge
Walking theory wears and damages the machine to deviate	Inspect, readjust, repair, or replace
The installation error of the walking wheel is too large, and it rubs or collides with the track	Adjustments, repairs, or replacements
The gap is too small	Inspect, readjust, repair, or replace
The rotary scraper suction dredge is unbalanced	Realignment
The effect of scraping and sucking mud and sand is not ideal	The gap between the suction nozzle or scraper and the bottom of the pool is too large	adjust
The suction nozzle is clogged	purge
The scraping mud (sand) board is worn	replacement
Clogged tubing	purge
Leaking pipes	repair
The suction sludge (sand) pump is damaged	Repair or replacement
The siphon fails	repair
The siphon system is out of order	The vacuum pump is damaged	repair
Leaking air in the pipeline	repair
The liquid level does not match	adjust
The reciprocating scraping and suction mud (sand) machine walking cable is not synchronized	The installation error of the walking wheel is too large, and it rubs or collides with the track	Adjustments, repairs, or replacements
Worn or aged cables	replacement
The sliding axis is jammed or deformed	Adjustments, repairs, or replacements
The cable drum motor is damaged	replacement
There is debris on the walking tracks	purge
Coupling clearance is too large or uneven	Realignment
The relay is out of order	Adjustments, repairs, or replacements

9. Common faults and troubleshooting methods of submersible sewage (mud) pumps in aerators and pipeline systems

failure	Primary Causes	Exclusion Method
Motor abnormal	Line fault	Check, exclude
The motor is damaged	Repair or replacement
The installation size is too low, so that the impeller and blade depth into the water is too large, the load is heavy, and the current is too large	Check, adjust, exclude
The liquid level does not match the designed impeller and the depth of the blade entering the water, and the load is heavy and the current is too large	adjust
The angular deviation of the impeller and blade is too large, the load is heavy, and the current is too large	Check, adjust, exclude
There are many sundries in the impeller and blades	Manual removal
The reducer is not normal	The lubrication system is damaged, the lubrication is poor, and the oil temperature rises	Disassemble and overhaul and replace parts
Excessive wear of gears, excessive gap between teeth, and noise	Disassemble and overhaul and replace parts
Bearing damage is noisy	Disassemble and overhaul and replace parts
The connecting bolts are not tightened and oil is leaking	Tighten the bolts
Coupling clearance is too large or uneven	Realignment
Excessive refueling and deterioration of the oil	Refuel and replace according to regulations
The seal between the box and the lid is poorly assembled or fails, damaged, and leaks oil	Disassemble and overhaul and replace parts
Excessive vibration	The mounting bolts are loose	Realignment
Imbalance of impellers and blades	Realignment
There are sundries in the impeller and blades	purge
Coupling clearance is too large or uneven	Realignment
The impeller and blades have been damaged	Replacement or repair
The levelness error of the horizontal brush aerator is too large	Realignment
Poor or unsatisfactory aeration	There is magazine, aeration head clogging	Remove, adjust, repair or replace
The aeration head is not set reasonably	Readjust or set
Leakage of air pipes	Repair or replacement
Insufficient air supply	Check, repair, adjust
The horizontal error of the installation of the aeration head is too large	Readjust or install
The aeration head is damaged	Repair or replacement
The micropores of the aeration head are too large	replacement
The aeration head has come loose	Readjust or install
The water flows too fast or unevenly	Readjust the angle of the blades and impellers
Imbalance of impellers and blades	Realignment
There are sundries in the impeller and blades	purge
The impeller and blades have been damaged	Replacement or repair
The depth of the impeller and blades into the water is too large or too small	Realignment

10. Common faults and troubleshooting methods of submersible mixer

failure	Primary Causes	Exclusion Method
The agitator should not be stirred	Insufficient voltage	Check, restore
The motor runs out of phase	Replace a faulty fuse or check the cable connection
The motor coil or power cable is out of phase	replacement
The line temperature sensor is cut off due to excessive temperature	Inspect, restore, or replace
Insufficient flow	rollback	Tune the cable
The agitator is not set up reasonably	Readjust or set
There are obstacles such as debris	purge
The impeller or blades are damaged	replacement
The inside of the agitator is damaged	replacement
The motor is running without a product	Replace a faulty fuse or check the cable connection
Wrong connection	Check, repair
The liquid level is too low	Check the level controller and adjust it
Excessive power consumption	The density of the liquid is too high	Check and reduce the density of the liquid
The inside of the agitator is damaged	replacement
rollback	Tune the cable
Insufficient voltage	Check, restore
The radial bearing on the side of the motor is damaged	replacement
Wrong connection	Check, repair
The agitator is not running smoothly or is noisy	The density of the liquid is too high	Check and reduce the density of the liquid
The impeller or blades are damaged	Replacement, restoration
The inside of the agitator is damaged	replacement
rollback	Tune the cable
The radial bearing on the side of the motor is damaged	replacement
The liquid level is too low	Check the level controller and adjust it
The suspension chain fails	Suspension corrosion, abrasion	replacement

11. Common faults and troubleshooting methods of submersible sewage (mud) pumps

failure	Primary Causes	Exclusion Method
No water or mud	The pump or line is not fully unblocked	Inspection, dredging,
Fouling blocks the pump's water inlet	purge
Damaged or leaking tubing	Repair or replace damaged tubing or seals
The absence of voltage causes the motor to not rotate	Check the line
The motor runs out of phase	Replace a faulty fuse or check the cable connection
Faulty motor coil or cable	Replacement or overhaul
The detection coil instrument stopped working due to the high temperature of the coil	Check or use manual starting
The temperature protection transmission fails, and the inside of the motor is damp	Inspect, dry, repair
The detection loop of the leak chamber has been triggered	Test the float switch and check the leak chamber
Insufficient traffic	The outlet pressure on which the pump is subjected is too high	Open the outlet valve until the pressure reaches the design requirements
The outlet side valve is not fully opened	Open the outlet valve completely
The outlet pipe or impeller is blocked, and the rotor is sluggish	purge
Wear and tear on parts inside the pump	Replace wear parts
Damaged or leaking pump circuits	Repair or replace damaged tubing or seals
The pumping medium contains impermissible air or gases	purge
Steering error	Tune the cable
The motor runs out of phase	Replace a faulty fuse or check the cable connection
Wrong connection	Check, reconnect
The water level drops too much during operation	Check the water supply and level controllers
The current, power consumption, and flow rate are too large	The pump is not operating within the operating range	Check the operating data of the pump
There are dirt in the impeller cavity, such as fibers, etc	Clear, making the impeller run easily
Wear and tear on the internal parts of the pump	Replace worn parts
Steering error	Tune the cable
Insufficient voltage	Check the connection of power supply and cables
Faulty motor coil or cable	replacement
The radial bearing on the side of the motor is damaged	replacement
The head is too low	The inlet pipe or impeller is blocked, and the rotor is sluggish	purge
The internal parts of the pump are worn	replacement
Damaged or leaking tubing	Repair or replace damaged tubing or seals
The pumping medium contains impermissible air or gases	purge
Steering error	Tune the cable
Wrong connection	Check, reconnect
The pump runs unevenly and is noisy	The pump is not operating within the operating range	Check the operating data of the pump
The inlet pipe or impeller is blocked, and the rotor is sluggish	purge
There are dirt in the impeller cavity, such as fibers, etc	Clear, making the impeller run easily
The internal parts of the pump are worn	replacement
The pumping medium contains impermissible air or gases	purge
Vibration caused by the device	Check, readjust, repair
Steering error	Tune the cable
The radial bearing on the side of the motor is damaged	replacement

12. Common faults and troubleshooting methods for air blasting

failure	Primary Causes	Exclusion Method
Low pressure, vacuum, low volumetric flow is measured by a pressure gauge or determined during the production process	rollback	Tune the cable
The air or gas pipeline is too small, and there are too many elbows and too much loss	Increase the size of the pipes or install machines with higher pressures
Local blockage of air intake, exhaust, or ductwork	purge
The air inlet pressure is too low	Check if the air inlet has an obstacle or install a machine with exhaust pressure
The temperature of the air inlet is too high	The air intake is placed in a shady place
The machine did not run at the agreed speed	Check the motor speed and detect the voltage
The concentration of the gas is low or there is a special	Analyze the gas and increase the gas concentration
The seal gap is too large	Adjust the gap or replace the sealing ring
The inlet duct filter is clogged	Clear filters
The pressure gauge or vacuum gauge is not accurate	calibration
The valves in the pipeline are not fully opened or the check valve is not installed	Open the valve or check the check valve
The mechanical design capability is too small for the system	The design of the system requirements by the user is not accurate	Install larger capacity or low pressure machines to use the requirements of the system
The system is leaking or there are too many gaps	Find and repair leaks and reduce the number of voids
Machine noise
Machine failure, bearing hum or rumble	The bearing heats up	Check the lubrication and check that the coupling is aligned
Bearing damage	Replace the bearings
Coupling clearance is too large or uneven	Realignment
Bearing cage wear	Replace the bearings
The lock nut is loose and the bearing rotates relative to the shaft (inner ring)	Tighten the nut and check for damage
Housing wear, rotation of the bearing relative to the housing (outer ring)	Replace the housing or bearing
Interior noise	Impeller wear	Air filtration should be ensured, and the impeller should be replaced
Machine surge	Increase air flow
The machine vibrates violently and is unbalanced	Shutdown inspection and adjustment
The coupling is misaligned or has no lubricating esters	Inspect, adjust, replace, and re-lubricate
There is debris inside the machine	Clean
There is an impact sound on the impeller or bushing	Tighten, repair or replace
Coupling clearance is too large or uneven	Realignment
The motor is not working properly	Abnormal buzzing	Check the voltage and line connections
The voltage is low and the motor speed is insufficient	Regulate the voltage
A high voltage, causing noise and burning	Regulate the voltage
Bearing noise	Inspect, repair, or replace
The internal parts of the motor are loose	Tighten, repair or replace
The frequency is too low	Adjust the frequency
Machine vibration	Impurities accumulate on the impeller	purge
The spindle is bent	Repair or replacement
Bearing damage	replacement
An unbalanced replacement motor was installed	Inspect, repair, or replace
Internal parts are impacted	Inspect, repair, or replace
The crew Zhao Zheng precision destruction	Recalibrate
The rotor dynamic balance accuracy is destroyed	Recalibrate
Rolling bearing damage	replacement
Enter the surge zone or load a few words change	Adjust the opening of the valve and adjust the performance of the fan
Anchor bolts are loose
Coupling clearance is too large or uneven	Realignment
There is standing water or solid matter inside the case	Downtime Exclusion
Machine surge	Adjust the exhaust pressure or flow
The machine installation is not sturdy	Reinforcement of the foundation
Solid particles pass through the fan	Clean
The kingpin is damaged	replacement
The motor heats up	Overload, too much air passing through the fan	Check for leaks, open the valve a little smaller, and install more motors
Short circuit, insulation	Repair or replace the motor
The cooling water pipe is not open or clogged	Open the cooling water pipe or clear
Grease deteriorates and fails	Replace the grease
Incorrect power supply frequency	Adjust the frequency
Incorrect voltage	Adjust the voltage
The rolling bearing is mounted in an incorrect position	Adjust or replace
Coupling clearance is too large or uneven	Realignment
The ambient temperature is too high for the insulation level	Cool the motor or replace it with a motor with an appropriate insulation rating
The belt is damaged	The belt is damaged	replacement

13. Common faults and troubleshooting methods of sludge dewatering machine

failure	Primary Causes	Exclusion Method
The moisture content of the mud cake is too high	The tension of the track is too small	Increase the tightening force, generally not more than 0.5MPa
The belt speed is too fast	Reduce the filtration rate, generally not less than 3m/min
The sludge supply is uneven	adjust
The moisture content of the mud cake is too low	The track tension is too great	Reduce the tension force, generally not less than 0.3MPa
The belt speed is too slow	Increase the filtration rate, generally not more than 8m/min
The sludge supply is uneven	adjust
The mud cake is too thin	The track tension is too great	Reduce the tension force, generally not less than 0.3MPa
The belt speed is too fast	Reduce the filtration rate, generally not less than 3m/min
The dosage is too small	Increase the amount of medication to be taken
Obstruction	purge
The sludge supply is too small	adjust
The mud cake is too thick	The tension of the track is too small	Increase the tightening force, generally not more than 0.5MPa
The belt speed is too slow	Increase the filtration rate, generally not more than 8m/min
The amount of medicine is too large	Reduce the amount of medication you take
The sludge supply is too large	adjust
Throughput Too small	The track tension is too great	Reduce the tension force, generally not less than 0.3MPa
The belt speed is too slow	Increase the filtration rate, generally not more than 8m/min
The dosage is too small	Increase the amount of medication to be taken
The dosage is too large	adjust
Obstruction	purge
Insufficient sludge supply	adjust
Throughput Taidai	The tension of the track is too small	Increase the tightening force, generally not more than 0.5MPa
The belt speed is too fast	Reduce the filtration rate, generally not less than 3m/min
The dosage is large	adjust
The sludge supply is too large	adjust
The filter belt is difficult to rinse	The tension of the track is too small	Increase the tightening force, generally not more than 0.5MPa
The belt speed is too slow	Increase the filtration rate, generally not more than 8m/min
Flushing pump malfunction	overhaul
The flushing mechanism is clogged	purge
divulge	The connection port is not sealed	Repair or replacement
Damage to the cylinder block or piston rings	Repair or replacement
Valve failure and damage	Repair or replacement
Vibrations or unusual sounds	Bearing damage	replacement
The parallelism error of the shaft is too large	Realignment
The limit switch is out of order	Inspection, repair and replacement
There is friction or collision on the moving part	Realignment
The connection is loose	Realignment
Filter belt mistracking	The material is uneven	adjust
Failure or malfunction of the correction system	Check the switch
The error of the roll system is too large	adjust
Cylinder leakage fails	Check, repair
The filter belt is damaged	Long-term damage, aging	replacement
The filter belt is rubbing	Repair or replacement
The interface is uneven	Reconnect
The reducer is not working properly	See the judgment of reducer failure
The motor is not working properly	See the judgment of motor failure

14. Common faults and troubleshooting methods of dosing pumps

failure	Primary Causes	Exclusion Method
The pump is not running	The level of the herb in the reservoir is too low	Add liquid medicine to the pool
The valve is damaged	Wash or replace
The thermal device in the motor starter jumps off	reposition
The voltage is too low	Realignment
The pump is not filled with liquid	Liquid should be delivered to the pressure line by filling the pipette and pump head with liquid
The stroke adjustment is set to the zero position	Readjust the stroke setting
The pump is not producing enough liquid	The stroke is set incorrectly	Readjust the stroke setting
The pump is running at the wrong speed	Set the voltage and frequency according to the name plate data of the pump
Pipette leakage	repair
The suction lift is too high	Raise the liquid level
The safety valve in the outlet line is leaking	Repair or replacement
liquid黏度太高	Reduce the concentration
Worn or contaminated valve seats	Wash or replace
Insufficient aspiration	Increase the diameter of the pipette or the tip of the pipette
The output is unstable	Pipette leakage	repair
Leakage of safety valve	Repair or replacement
The suction head is insufficient	Raise the liquid level
Worn or contaminated valve seats	Wash or replace
The line filter is clogged	Wash the filter
The motor or pump body is overheated	The operating temperature of the motor or pump body is too high	cooling
The power supply does not meet the electrical specifications of the motor	The regulated power supply is matched with the motor
The pump operates in excess of rated performance	Reduce pressure or stroke speed
The pump has the wrong lubricating oil filling	Refill the lubricating oil
The pump is still delivering the liquid while the stroke is set	Misadjusting the dial dial	Readjust the stroke setting
Insufficient hydraulic difference	Correction of operating conditions
The gear noise is excessive	The gap between the teeth is too large	Overhaul and replacement
Bearing wear	Overhaul and replacement
Lubricating oil filling error	Refill the lubricating oil
There is a loud punch on every stroke	Excessive wear and tear of gear components	Overhaul and replacement
Bearing wear	Overhaul and replacement
The bottom of the pump head detects empty material leakage	Fracture of the diaphragm	replacement
The bottom of the pump head is detected for oil leakage	The oil seal is damaged and the connecting bolts are loose	Replace the oil seal or tighten

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