Oil Leak

Oil Leak

Cause/Solution

 Most Common:

 • Worn Crankcase Oil Seals
 • Loose Drainplug
 • Loose Oil Sight Gauge
 • Overfilled Oil Level

  Worn Crankcase Oil Seals

Cause
The crankcase has three crankcase oil seals, one on each plunger rod and two crankshaft oil seals. The drive-end crankcase operates in an oil bath (not under pressure) to supply splash lubrication to the drive end components.  Oil seals can wear over time and allow oil to leak. 

Solution
Inspect and replace worn seals. Follow service and preventive maintenance recommendations.  

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Loose Drainplug
 

Cause
Pump drive-ends are equipped with either a drain cap or a drain plug.  Drain plugs could work loose due to system vibration, resulting in an oil leak. Other issues could cause oil leaks, such as cross-threading the plug or not applying enough torque to create a tight seal.

Solution
Inspect drain plug for damage. Tighten or replace as indicated.

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Loose/Damaged Oilsight Gauge
 

Cause
Each pump drive end is equipped with an oil sight gauge to view the oil level. A loose or cracked sight gauge could result in an oil leak. Note: it is important to maintain an adequate amount of crankcase oil. Oil level should never fall below the red dot of the sight gauge.

Solution
Inspect and tighten if necessary. Replace if damaged.

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Overfilled Oil Level
 

Cause
Consult the pump datasheets for the proper volume of oil for a specific pump model. The normal oil volume fills approximately one-half of the pump crankcase. Overfilling the crankcase can result in oil spilling or spurting through the vented filler cap or building internal pressure. 

Solution
Reduce oil level to proper volume. Slightly turn filler cap to stop oil from exiting through the oil filler cap vent port.

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Minneapolis, MN 55449

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