1. The bearing body components replace the original Y-type oil pump 35, 50, and 60 bearing bodies with 45, 55, and 70 bearing bodies respectively, which improves reliability.
2. The hydraulic flow-passing parts adopt a high-efficiency and energy-saving hydraulic model, which is 5-8% more efficient on average than the old Y-type oil pump.
3. In order to maintain inheritance, the structural type, installation dimensions, performance parameter range, and material grade of the AY-type oil pump remain the same as the Y-type oil pump, making it easier to update and transform old devices.
4. Parts have a high degree of generalization, and standard parts are shared by several series of products.
5. Material selection and refining, mainly made of type II and III materials. The bearing body and other parts are now available in cast iron and cast steel, which provides favorable conditions for cold areas, outdoor use, and marine use.
6. There are three types of bearings: air cooling, fan cooling, and water cooling. Select according to different operating temperatures of the pump. Among them, fan cooling is especially suitable for areas with water shortage or poor water quality.
7. Based on customer opinions, our factory has improved the design of some parts of the AY oil pump, and the quality has been improved to a higher level.

Install

1. The height, length, and diameter of the pump suction pipe should meet the design requirements and ensure that the allowable cavitation margin of the pump is not exceeded during operation.
2. The suction and discharge pipes should have pipe racks, and the pump body is not allowed to bear the external load of the pipes.
3. The suction pipeline should be short and straight. The diameter of the pipe should be 1-2 steps larger than the diameter of the pump suction inlet. At the same time, it should be connected by an eccentrically shrinking reducing pipe. The pump suction pipeline should have a bending radius as large as possible.
4. Correct the concentricity of the pump shaft and the prime mover shaft. The deviation on the outer circle of the two half couplings is allowed to be ≤0.08mm, and the end face deviation is ≤0.05mm.
5. After installing the pipeline and determining the rotation direction of the prime mover, reinstall the coupling.

Preparation before driving

1. Lubricate the bearing body. The recommended bearing lubricant is No. 22 or No. 30 turbine oil.
2. Turn on the cooling water. If the seal is flushed externally, seal oil should be supplied.
3. Open the suction valve and discharge valve, fill the pump with liquid, and then close the discharge valve.
4. Turn on the power, start the car (stop immediately after driving), and observe whether the rotation direction of the pump shaft is counterclockwise.
5. When transporting hot oil, it must be preheated evenly before driving. Preheating is performed by using the transported hot oil to continuously pass through the inside of the shell. The recommended preheating speed is 40℃-50℃/h.

Operate

1. After starting, open the discharge valve of the pump immediately. Never allow the discharge valve of the pump to be closed for a long time to prevent damage to the pump caused by overheating.
2. The motor load current cannot exceed the rated current of the motor.
3. After operation, generally observe whether the pressure and current of the pump are within the normal range of use. The pump should not be continuously operated below the minimum continuous stable flow rate.

If the pump does not give a minimum continuous stable flow, it should not operate continuously at less than 30% of the design flow.

4. The gate valve on the suction pipe cannot be used to adjust the flow to avoid cavitation.
5. Check the vibration during normal operation. The unfiltered vibration measured on the rolling bearing body should not exceed the peak speed of 7.6mm/S.
6. When the pump has reached the operating temperature and pressure, check the pump unit again and readjust (fine-tune) the pump unit if necessary.
7. After running for about 24 hours, drive a taper pin on the horizontal supporting surface of the pump body. If the base of the prime mover allows, a tapered pin must also be drilled, the diameter of which depends on the neutral position.

Maintenance

1. Check the bearing heating regularly. The rolling bearing temperature should not exceed 80°C, and the sliding bearing part should not exceed 65°C.
2. The oil cup should be checked every 8 hours during shift change to see if the oil level in the oil cup is normal.
3. It is recommended to drain and flush the oil every six months, and then add new oil. Generally, this is done in spring and autumn. Frequent oil changes are also necessary for sites in humid, desert areas, with severe climate changes, and in the open air.
4. For the spare pump on the device, the rotor component should be rotated regularly. It is recommended to rotate it once a week, about 360°+90° each time, to prevent deformation and maintain the lubricating oil film of the bearing lubricant.
5. The high-temperature standby pump on the device must be maintained at a certain temperature to prepare for use.

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The following table lists the possible failures of the pump during operation, the causes of the failures and the solutions.

Note: NPSH means pure suction head, which is the value higher than the vaporization pressure of the liquid delivered by the pump. When the pump is running, the NPSHA value of the device is not allowed to be smaller than the NPSHR value

1. The impeller nut of the cantilever pump is connected to the shaft with a left buckle, and the eccentricity is fixed with GB80-85 M6 hexagonal socket screws to prevent loosening.
2. All rubber O-rings must be prevented from sharp corners and burrs during assembly. At the same time, after using it once, under normal circumstances, it cannot be used a second time.
3. There should be no signs of cracks on the bushing pad, especially be careful not to forget to install it.
4. The thrust ball bearing is type 7300 produced by SKF, which is installed or replaced in back-to-back pairs.
5. Heat the bearing to 80-95 and install it on the shaft. Then, keep the axial deflection between the rear bearing cap and the thrust ball bearing between 0.13-0.25mm and adjust it with its gland pad.
6. Before reassembly, clamp the pump shaft on the lathe, and use a dial indicator to check that the concentricity of key parts of the shaft (such as the bushing, bearing, impeller…) does not exceed 0.05mm.
7. Please refer to the “Mechanical Seal Installation and Operation Instructions” for details on the disassembly and assembly of mechanical seals and precautions.

Maintenance content

1. Check the wear of the housing sealing ring, impeller sealing ring, throat bushing, shaft sleeve, guide vane sleeve, bearing, impeller, dynamic and stationary ring of mechanical seal and other parts.
2. Clean the dirt and blockage in the cooling water, sealing oil pipelines and water-cooling chamber.
3. Check and adjust the bending of the shaft and the runout of the rotor.
4. Check the O-ring seal, sleeve gasket, pump cover gasket, and mechanical seal gland gasket for defects and scratches.
5. Check the concentricity of the two coupling halves.

Maintenance requirements

1. If the sealing ring gap doubles (resulting in a decrease in efficiency and an increase in power) or the current increases too much, replace it.
2. Grooves appear on the outer surface of the packing sleeve, and there are scratches on the sealing surfaces of the dynamic and static rings of the mechanical seal, especially radial scratches. In mild cases, they should be repaired by grinding, and in severe cases, replace them.