    First pump (fan) outlet door closed to prevent adverse lax door, the pressure of the mother pipe back to the human L-1 pipe, causing the manual test pump reversal. Pour water on the system negative, reversing the water pump is harmful.
　　
Stop fan, stop pump, and pay attention to lazy walking time. If the time is too short, we must check whether the pump (fan) grinding phenomenon.
　　
For forced lubrication of large pumps (such as boiler feed pump ), stop pump need to start before the auxiliary pump to prevent the process of burning down during deceleration. When the pump (fan) stops, it should be determined whether the population valve should be closed based on the connection of the system to the pump (fan). Close the exit door should be immediately shut down shut down. Sixth, the pump or fan should be started after the start of the work to observe the pump or fan can start, and should listen to the fan or pump motor sound. If you make a buzzing sound and the motor does not turn, stop it immediately and check it.
　　
Should pay attention to check the pump (fan) is stuck or manual disk inspection? Shu? / Span>
　　
Check the motor is normal, the wiring is correct. Sometimes because the motor has a phase can not be turned off.
　　
Noise in the pump often appear in operation
　　
Loose noise
　　
Loose noise is the sound generated by the loosening of rotor parts on the shaft, which is often periodic in nature. Such as circulating pump impeller, the sleeve loose on the shaft (the gap is even 1 ~ 3mm), will be issued a slight choking noise. If the pump shaft is bent at this moment, the collision sound will be greater because the impeller and the bushings have a tendency to sag on the shaft, and the gap appears below the shaft. However, when the curved surface of the convex to the top, it will impact the impeller upward movement, not waiting for the impeller to move up, the pump shaft convex down to the bottom, the impact impeller down. After that, the convexity of the pump shaft turns to the top again, and the impeller is re-struck to move upwards, thus giving a periodic sound. It must be pointed out that in this case the pump is very dangerous movement, in addition to the rotor parts due to swing caused by the leakage of air into the pump, the more serious is that the impeller cracks and pump shaft rupture (at the edge of the mating parts) Wait.
　　
Some of the rolling bearing of the spacer sleeve bearing is pressed against because they did not, there will rattle off the shaft during operation. Due to the gap between the spacer and the shaft is large, when it is not pressed in the axial direction, it will make the gap appear below the shaft, but occasionally the reason will take the gap to the top, due to its own quality, Distance away from the set, issued a slight impact with the shaft.
　　
Small flow abnormal sound
　　
Small flow abnormal noise is mainly for the volute pump. The small flow noise is similar to the cavitation sound, but some are larger and resemble the sound of gravel falling onto the pump casing. This is mainly the design of the position of the pump tongue.
　　
Rolling bearing noise
　　
New for the rolling bearing, due to assembly radial stress is too large, rolling body rotation difficult, will issue a low buzz, then the bearing temperature will rise.
　　
If the amount of oil in the bearing body is insufficient, the running bearing will emit a uniform whistle.
　　
Rolling body and spacer gap is too large, the operation can be issued a larger whistling sound.
　　
In the rolling bearing outer ring raceway surface or rolling surface peeling, the operation will be issued intermittent impact and beating
　　
If the rolling bearing damage (including the isolated frame broken, rolling body broken, inner and outer ring cracks, etc.), there will be cracked crackling popping sound.
　　
The main reason for not starting water when the pump starts
　　
Impeller or key damage, can not normally pass the energy to the water.
　　
Before starting the pump is not filled with water, or a serious air leak.
　　
Blocked water flow channels, such as population at the end of the valve, impeller channel, the population of debris or human population flap off.
　　
The geometry of the pump is too high.
　　
Pump speed is too low, mostly occurred in the belt drive occasions, because at this time the pulley does not match or with loose. Cantilever Centrifugal sewage pump outlet pressure is lower than the pressure of the mother pipe, the water can not go out.
　　
Motor wiring error caused reversal.
　　
Bearing high temperature reasons
　　
Drops are too low, so that reduce the amount of oil into the bearings.
　　
Unqualified oil, water into the impurities or emulsified metamorphism.
　　
Oil ring does not rotate, bearing oil supply interruption.
　　
Bearing cooling water shortage.
　　
Bearing damaged.
　　
For rolling bearings, in addition to the above reasons, if the bearing cover exerts too much force on the bearing, crushing its radial clearance, the loss of bearing flexibility, can also cause the bearing temperature.
　　
Stop fan, stop pump, and pay attention to lazy walking time. If the time is too short, we must check whether the pump (fan) grinding phenomenon.
　　
For forced lubrication of large pumps (such as boiler feed pump ), stop pump need to start before the auxiliary pump to prevent the process of burning down during deceleration. When the pump (fan) stops, it should be determined whether the population valve should be closed based on the connection of the system to the pump (fan). Close the exit door should be immediately shut down shut down. Sixth, the pump or fan should be started after the start of the work to observe the pump or fan can start, and should listen to the fan or pump motor sound. If you make a buzzing sound and the motor does not turn, stop it immediately and check it.
　　
Should pay attention to check the pump (fan) is stuck or manual disk inspection? Shu? / Span>
　　
Check the motor is normal, the wiring is correct. Sometimes because the motor has a phase can not be turned off.
　　
Noise in the pump often appear in operation
　　
Loose noise
　　
Loose noise is the sound generated by the loosening of rotor parts on the shaft, which is often periodic in nature. Such as circulating pump impeller, the sleeve loose on the shaft (the gap is even 1 ~ 3mm), will be issued a slight choking noise. If the pump shaft is bent at this moment, the collision sound will be greater because the impeller and the bushings have a tendency to sag on the shaft, and the gap appears below the shaft. However, when the curved surface of the convex to the top, it will impact the impeller upward movement, not waiting for the impeller to move up, the pump shaft convex down to the bottom, the impact impeller down. After that, the convexity of the pump shaft turns to the top again, and the impeller is re-struck to move upwards, thus giving a periodic sound. It must be pointed out that in this case the pump is very dangerous movement, in addition to the rotor parts due to swing caused by the leakage of air into the pump, the more serious is that the impeller cracks and pump shaft rupture (at the edge of the mating parts) Wait.
　　
Some of the rolling bearing of the spacer sleeve bearing is pressed against because they did not, there will rattle off the shaft during operation. Due to the gap between the spacer and the shaft is large, when it is not pressed in the axial direction, it will make the gap appear below the shaft, but occasionally the reason will take the gap to the top, due to its own quality, Distance away from the set, issued a slight impact with the shaft.
　　
Small flow abnormal sound
　　
Small flow abnormal noise is mainly for the volute pump. The small flow noise is similar to the cavitation sound, but some are larger and resemble the sound of gravel falling onto the pump casing. This is mainly the design of the position of the pump tongue.
　　
Rolling bearing noise
　　
New for the rolling bearing, due to assembly radial stress is too large, rolling body rotation difficult, will issue a low buzz, then the bearing temperature will rise.
　　
If the amount of oil in the bearing body is insufficient, the running bearing will emit a uniform whistle.
　　
Rolling body and spacer gap is too large, the operation can be issued a larger whistling sound.
　　
In the rolling bearing outer ring raceway surface or rolling surface peeling, the operation will be issued intermittent impact and beating
　　
If the rolling bearing damage (including the isolated frame broken, rolling body broken, inner and outer ring cracks, etc.), there will be cracked crackling popping sound.
　　
The main reason for not starting water when the pump starts
　　
Impeller or key damage, can not normally pass the energy to the water.
　　
Before starting the pump is not filled with water, or a serious air leak.
　　
Blocked water flow channels, such as population at the end of the valve, impeller channel, the population of debris or human population flap off.
　　
The geometry of the pump is too high.
　　
Pump speed is too low, mostly occurred in the belt drive occasions, because at this time the pulley does not match or with loose. Cantilever Centrifugal sewage pump outlet pressure is lower than the pressure of the mother pipe, the water can not go out.
　　
Motor wiring error caused reversal.
　　
Bearing high temperature reasons
　　
Drops are too low, so that reduce the amount of oil into the bearings.
　　
Unqualified oil, water into the impurities or emulsified metamorphism.
　　
Oil ring does not rotate, bearing oil supply interruption.
　　
Bearing cooling water shortage.
　　
Bearing damaged.
　　
For rolling bearings, in addition to the above reasons, if the bearing cover exerts too much force on the bearing, crushing its radial clearance, the loss of bearing flexibility, can also cause the bearing temperature.
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