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How to conserve farm submersible pumps
During the off-season, it's essential to perform routine maintenance on submersible pumps to extend their lifespan and ensure they function properly when needed. Here are key steps to follow:
1. **Inspect Wear Parts**: Check components such as the impeller, shaft couplings, bushings, and bearing housings. Partially disassemble the pump to examine these parts for damage or wear. Always use high-quality, original spare parts and avoid using damaged or unqualified ones.
2. **Replace Lubricating Oil**: Open the oil plug in the seal chamber and motor, drain all the old lubricant, and replace it with fresh oil. This ensures the lubrication system operates efficiently and prevents mechanical failure.
3. **Remove Rust from Pump Housing**: Before starting the pump after a long period of inactivity, open the top casing, rotate the impeller manually, and then start the pump. This helps prevent rusted parts from causing the motor to overheat or fail during startup, especially important for water-filled motors.
4. **Ensure Seal Integrity**: Agricultural submersible pumps require tight seals. If the sealing lubricant is cloudy or has high moisture content, replace the entire seal or the seal ring to maintain proper sealing performance.
5. **Dry the Motor**: Use a 500-megohmmeter to measure the insulation resistance between the windings and the housing. If the resistance is below 0.5 megohms, the motor is likely damp and needs drying. Methods include:
- **External Drying**: Use a heat source like a hair dryer (for small pumps) or hot air blower.
- **Bulb Baking**: Place 200-watt bulbs inside a sealed box and bake at temperatures below 125°C.
- **Current Drying**: Connect the motor windings in series or parallel, add a variable resistor, and apply about 60% of the rated current to dry the motor effectively.
6. **Check Bearing Lubrication**: For water-filled submersible pumps, inspect and replace the skeleton oil seals and lithium grease in the upper and lower bearing chambers. Proper lubrication is crucial for long-term bearing performance.
7. **Inspect Bearings**: Check the upper and lower bearings of the motor. If you hear a “click†sound that corresponds with rotation speed, or if turning the rotor feels stiff or uneven, the bearing may be worn or damaged. Replace it immediately to prevent further damage. A bearing that produces irregular noises or has a dead spot when turned should also be replaced.
Regular maintenance not only improves the efficiency of the pump but also reduces the risk of unexpected breakdowns during peak usage periods. Taking the time now can save both time and money later.