Split Case Pump Efficiency Dropping Too Soon?
Release time:
2025-08-15
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Split Case Pump Efficiency Dropping Too Soon?
Avoid These 4 Common Maintenance Mistakes
Many pump users have faced this situation:
When first purchased, a split case pump delivers excellent efficiency, but after about five years, pumping becomes noticeably slower and electricity bills go up.
The good news? This drop in performance doesn’t always mean the pump is “worn out.” In many cases, the real culprit is improper maintenance.
At M&W PUMP, our technical after-sales engineers have helped countless clients solve efficiency problems caused by routine maintenance errors. Here, we share the 4 most common mistakes — and how to fix them — so you can keep your pump performing like new for years.
1. Over-Greasing the Bearings
It’s a common belief that “more grease = better lubrication,” but too much grease in the bearing housing causes overflow. This excess grease traps dust and forms sludge, increasing friction instead of reducing it.
Best practice: Fill the bearing housing to only 1/2–2/3 of its volume. Our Shanshui Energy Saving grease guns are equipped with clear scales — just add to the marked level for optimal results.
2. Cleaning the Filter Screen but Neglecting the Impeller
Yes, a clogged inlet filter screen can restrict water flow. But scale and debris buildup on the impeller is often the hidden performance killer.
One water plant’s pump ran for five years before we inspected it — the impeller had a 1 mm layer of scale, reducing efficiency by 15%.
Best practice: Every six months, dismantle the pump and soak the impeller in a weak acid solution, then rinse. This simple step can restore up to 80% of lost efficiency.
3. Ignoring Worn Seals
When mechanical seals wear down, water leakage follows. Many operators assume “a little leak won’t matter” — but even small leaks reduce internal pump pressure, lowering efficiency.
Best practice: M&W PUMP mechanical seals feature a wear-warning system. At the first sign of seepage, replace the seal promptly to prevent performance decline.
4. Skipping Concentricity Checks
Operational vibration gradually loosens the coupling. A concentricity deviation of just 0.1 mm can reduce efficiency by 5%.
Best practice: Perform laser alignment annually. This quick, low-cost procedure — taking less than an hour — can noticeably boost pump performance.
The Bottom Line
By avoiding these 4 common mistakes, a split case pump can maintain high efficiency for 8 years or more without significant performance loss.
If you’re unsure about your pump’s maintenance, or you need a professional upgrade plan for your pumping system, click here,our team at M&W PUMP is ready to help.
Efficiency starts with proper care — and we’re here to make sure you get it right.
#Split Case Pump #Pump efficiency # M&W Pump
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Xiangtan Hunan P.R.C
Tel: +86-731-55599916
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Hunan M&W Pump Co., Ltd
