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Internal Gear Pumps: Common Faults And Maintenance Methods

Common failures of     Internal Gear Pumps    : the pump cannot be oiled, the output flow is insufficient, and the pressure cannot be increased. China internal gear pump manufacturer, supplier & Zhejiang Yongling Hydraulic Machinery Co., Ltd. describes the following troubleshooting methods for gear pumps of this kind:

First, check the external gear

1. Due to the gear material (such as powder metallurgy gear) or the heat treatment is not good, the tooth surface is severely worn. For powder metallurgy gears, steel gears are recommended and heat treated.

2. Gear end face wear and tear. The gear end face is not severely worn and can be ground and polished. If the wear and tear is severe, the gear end face can be ground to size h1, the outer ring gear h2, and the stator inner hole depth h3 should also be ground away.

3. The tooth tip circle is worn. The outer circle of the gear can be brushed to compensate for the amount of wear.

Second, check the ring gear

1. When the matching gap between the outer circle of the inner ring gear and the inner hole of the housing is too large, the outer circle of the inner ring gear can be plated.

2. When the backlash between the tooth surface of the inner ring gear and the tooth surface of the gear is too large, in areas with conditions (such as the Pearl River Delta and the Yangtze River Delta), you can use a wire cutting machine to slowly wire to reprocess the copper inner ring gear Gears, replaced after heat treatment.

Third, check the crescent block

1. When the gap between the inner surface of the tooth block and the tooth top circle of the external gear is too large, brush the tooth top circle.

2. When the inner surface of the crescent block is seriously worn and strained, which causes large internal leakage between the pressure and oil suction chambers, use a wire cutting machine to slowly wire and reprocess the crescent block to replace it.

Fourth, check the housing (stator) and side plates

1. For the stator that doubles as the oil distribution plate, when the oil distribution end surface is worn and pulled with the groove, if the wear and tear is minor, it can be repaired with metallographic abrasive cloth; if the wear and tear is severe, it is difficult to repair.

2. If there is a side plate, when the side plate and the gear joint surface are worn and strained, the end surface of the side plate can be ground or ground, and subjected to nitriding or phosphating treatment.

As a professional China internal gear pump manufacturer and supplier. Zhejiang Yongling Hydraulic Machinery Co., Ltd. produces and supplies YLH series internal gear pumps with high working pressure, high volumetric efficiency, low pressure pulsation, low noise, wide speed range, and strong anti-pollution ability. This series of products are widely used in hydraulic systems of plastic machinery, leather machinery, pressure machinery, metallurgical machinery, forklifts and other industries. They are especially suitable for energy-saving systems of servo inverter drives. Welcome to buy: https://www.china-vanepump.com/product/internal-gear-pumps

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