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How to conserve farm submersible pumps
During the off-season, it's essential to perform routine maintenance on your submersible pump to extend its lifespan and ensure it operates efficiently when needed. Here are key steps to follow:
1. **Inspect Wear Components**: Begin by removing the pump partially to examine critical parts such as the impeller, couplings, bushings, and bearing housings. Ensure all components are in good condition and replace any damaged or substandard parts.
2. **Replace Lubricating Oil**: Open the oil plug on the seal chamber and motor, drain the old lubricant, and refill with fresh oil. This ensures the lubrication system functions properly and prevents mechanical failure.
3. **Remove Rust from Pump Housing**: Before using the pump again, open the top casing, rotate the impeller manually, and check for rust buildup. This helps prevent jamming and potential motor damage, especially for water-filled motors.
4. **Ensure Seal Integrity**: Agricultural submersible pumps require tight seals. If the sealing lubricant is contaminated or has high moisture content, replace the entire seal or the seal ring to maintain optimal performance.
5. **Dry the Motor**: Use a 500 megohmmeter to test the insulation resistance between the windings and the motor housing. If the reading is below 0.5 megohms, the motor is damp and needs drying. Methods include:
- **Hot Air Blowing**: Use an Electric Heater or hair dryer to blow hot air over the motor.
- **Bulb Baking**: Place 200-watt bulbs inside a sealed box and bake at a temperature not exceeding 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. **Lubricate Bearings**: For water-filled submersible pumps, check 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. **Check Bearings**: Inspect the upper and lower bearings of the motor. If you hear a "clicking" sound while running, or if turning the rotor feels stiff or uneven, it may indicate worn or damaged bearings. Replace them immediately to avoid further damage. A faulty bearing can cause excessive vibration, noise, and ultimately motor failure.
Regular maintenance during the off-season not only prolongs the life of your submersible pump but also saves you from costly repairs and downtime. Always use quality replacement parts and follow manufacturer guidelines for best results.