Maintenance and troubleshooting of sine pump

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Wenzhou Qianhao Machinery Technology Co., Ltd

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Date: 2025-06-26Read: 0

1、 Maintenance matters for sine pump

Insufficient maintenance, errors, or inaccuracies can all lead to pump malfunctions, high repair costs, and damage. When maintaining the pump, whether during inspection, regular maintenance, or installation, it is necessary to follow the instructions. Not following the instructions can pose a threat to the operator and cause damage to the pump and its components. Maintenance work must be carried out by professionals. Wear appropriate clothing to resist high temperatures, dangerous or corrosive liquids. Ensure that professionals have read the entire operation manual. Special attention should be paid to chapters that contain necessary work. QH shall not be held responsible for any accidents or damages caused by failure to follow the instructions in the manual.

construction

The shaft drive of the pump is carried out through the rotor on the shaft driver. The shaft is placed on the installed double angular contact ball bearings and ball bearings. In order to drag the rotor, the shaft needs to have keyway grooves to install the shaft and bearings as a whole on the support for lubrication of gears and bearings. The lip seal is used as a plug for the shaft on the base

work area

Provide a clean work area; Some parts need to be handled carefully

tool

Proper use of designated tools in repair and maintenance work.

disconnect

When performing maintenance and inspection work, disconnect the power supply. Reduce pressure on the pump and components. If the material being transported allows for disconnection, allow the pump to cool to room temperature

safety

If the motor is started remotely, when you need to operate the pump, be sure to prevent the motor from starting

Follow the following procedure:

● Turn off the pump switch

● Disconnect the power supply of the pump

● Block the power control panel or paste warning signs

Remove the fuses and bring them to the work area

Do not remove the protective device on the coupling side until all pumps have stopped

Operation process maintenance

Regularly check the suction and discharge pressure

● Regular inspection of sealing

Check the oil in the support

Check the shaft seal (mechanical seal does not require any maintenance; however, the seal cannot work in a dry state). If there is a leak, replace the seal

Check the oil level every week. If necessary, add oil in a timely manner (after the pump stops running), but do not add too much! Refer to the "Lubricating Oil" chapter

Check the appearance of the lubricating oil. If the lubricating oil is contaminated, it should be completely drained (after the pump stops running). Check the source of contamination, eliminate it, and add oil to the support. Refer to the "Lubricating Oil" chapter

Before maintenance, the pump should be stopped for a period of time

Firstly, empty the pump

Add VG46 mineral oil to internal components

The pump must run briefly once a week or manually rotate the bearings. This ensures that the lubricating oil can circulate correctly.

External cleaning

Keep the outside of the pump clean at all times. This helps with maintenance work, while warning signs should be clearly visible. Ensure that cleaning products do not fall into the bearings of the motor. Cover all parts that will come into contact with the material. The cleaning product should not touch the lip seal

Do not sprinkle water on hot parts, as it may cause the parts to crack and liquid to overflow from the pump body during rapid cooling.

Circuit maintenance

Only when the power is cut off can professional personnel perform maintenance work on the circuit installation. Seriously implement national security policies and systems.

If the power supply is still connected during work, follow the above rules and regulations.

Check if electronic materials are clean and properly protected (e.g. IP54 indicates dust and water resistance but does not include protection against high-pressure water spray). Choose appropriate methods to clean electronic materials.

Replace damaged fuses with fuses of specified amperes

After completing each maintenance task, check for any malfunctions in the electronic installation components and repair them promptly if necessary.

lubricating oil

Gears and bearings are immersed in the oil cylinder

Pump oil supply

When changing the engine oil: the oil tank must reach the center of the peephole

Do not pour too much oil into the oil tank! Turn off the pump switch when rechecking the oil level; If necessary, add some engine oil.

The room temperature of engine oil is 5 to 50 º C: Industrial gear oil 130-200EP

Equipped with a continuously variable speed reducer for transmission. Special oil should be added for stepless speed regulation deceleration: traction fluid UB-1 or UB-3 cannot use other lubricating oils

2、 Operation faults and troubleshooting of sine pump

The pump cannot self suction	Pump rotation direction incorrect	Check the steering direction
	There is no filling material in the pump	Fill material
	The bolt is not tightened	Tighten the bolts
	The straw is too long	Adjust the length of the straw
	Sealing leakage	Check the integrity of all seals
	Wear and tear inside the pump	Replace worn parts
	The pump speed is not suitable	Adjust the speed
The pump cannot transport the medium	Pump rotation direction incorrect	Check the steering direction
	Straw leakage	Check the pipeline system
	The motor speed is incorrect	Adjust the speed according to the output curve
	Wear and tear of vulnerable parts	Replace vulnerable parts
	Installed a closed gate valve	Check the pipeline

The pump has noise	Noise coming from the motor	Check the motor
	Imported straw is too small (due to cavitation)	Shorten the straw or increase its diameter to reduce speed
	The knocking sound comes from the pump head	Scraper wear
	The noise comes from the bearing housing	Come on, replace the tapered roller
	The coupling is not neat	Calibrate the coupling

Pump leakage and noise	Sealing leakage	Replace mechanical seal or lip seal
	ORing leakage	replaceOCircle shape
	Bearing seat lip seal leakage, oil leakage	Remove the bearing seat and replace the bearing seal ring
Leakage at the front end of the pump body	The gasketOThe ring is missing or installed incorrectly	Accurately install the sealing ring
Pump stops running	There are foreign objects inside the pump	Check and remove foreign objects
	Power supply interruption	Check the power supply
	Motor damage	Disassemble the coupling and manually rotate the pump.
Severe wear and tear during short-term operation	The material contains particles, and the conveyed material is abrasive	Regularly replace vulnerable parts, use appropriate materials, choose larger pumps, and reduce the speed
One end of the rotor is worn	The rotor was not tightened accurately during installation	Accurately tighten the nut
	The installation size of the bearing has been adjusted	Refer to the dimension adjustment table for adjustment
CIPAfterwards, the pump was not clean	Not following the cleaning regulations	Block the pressure side and check if there is a pressure difference3~4bar
The rotor is stuck in the stator	The rotor is not tightened accurately	Accurately tighten the nut
	The temperature is too high.	Choose washers with larger tolerances.

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