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Basic Maintenance Guide for ISUZU Sewage Suction Trucks With Water Ring Pumps

Aug 15, 2025

The water ring pump is the core vacuum generator of ISUZU sewage suction trucks, which is highly praised for its simple structure, low maintenance cost, fast suction speed, and high efficiency. Proper maintenance is crucial for maintaining optimal suction power and preventing operational failures. Follow the following key maintenance practices:

1. Bearing maintenance

Regularly check the lubrication condition of the bearings. Lubricate the bearings 3-4 times a year and thoroughly clean them at least once a year. Monitoring working temperature - bearings should operate at 15-20 ° C above ambient temperature and not exceed 55-60 ° C. If abnormal heating is detected, operation should be stopped immediately and the cause investigated. Proper bearing maintenance can reduce wear, extend pump life, and lower operating costs.

ISUZU sewage tank truck

2. Maintenance of sealing system

O Cover packing seal: Regularly compress the packing to maintain sealing. If a leak occurs, replace the worn packing annually (during bearing cleaning). Ensure moderate compression - slight dripping is necessary for cooling and effective sealing.

Mechanical seal: If there is a leak, check the dynamic and static rings. If damaged or showing signs of aging, please replace the ring immediately.

ISUZU Sewage suction truck

3. Drive belt inspection

Regularly inspect the belt joints for cracks, wear, damage, or defects. Timely replace damaged belts to prevent sudden breakage during operation (major safety hazard). Adjust the tension using an idler to ensure the correct tightness.

ISUZU GIGA vacuum truck

4. Water management

Continuously monitor the water level in the pump tank to ensure it is sufficiently full ("more rather than less"). Do not let the pump run idle, as this can lead to catastrophic pump burnout. In addition, regularly clean the rust residue in the fuel tank to prevent debris from entering and damaging the pump.

ISUZU Sewage tank truck

5. Anti backflow

During operation, be alert to the backflow of sewage into the pump. If backflow occurs, stop immediately, disassemble the water ring pump, carefully clean the pump chamber, water tank, and four-way valve to avoid serious internal damage.

 Consistently adhering to these maintenance procedures ensures sustained high performance, prevents costly failures, and maximizes the reliability and efficiency of the sewage suction truck water ring pump system.

ISUZU high pressure suction truck

To know more about our ISUZU Vacuum Truck, please check below website:

https://www.isuzuvehiclescl.com/isuzu-vacuum-truck

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