| Bad bearing |
| With regular maintenance schedule and oil changes, your bearings should not require replacement for many years. Oil leaking around the bearing cover indicates the seal is worn and the bearing should be replaced. If crankcase oil has been severely contaminated, the bearings will be affected. Operating the pump with excessive wear to the seals and packings will result liquid traveling back along the plunger rod. This eventually will attack the crankcase oil seal and permit oil/water mix and contamination of the crankcase oil. CHANGE OIL IMMIDIATELY IF CONTAMINATED. Operation in excessively humid conditions or with direct spray onto the pump may also affect the crankcase oil. |
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| Bad plunger or piston rod |
| With a regular maintenance schedule, plunger [piston] rod wear is not a regular maintenance concern. Prolonged operation with worn Lo-Pressure and Hi-Pressure seals [Plunger Pumps] OR cups and piston rod o-rings [Piston Pumps]can result in liquid traveling back along the plunger[piston] rod and resulting in scoring of the rod. This scored surface will cause wear to the crankcase oil seal and some external leaking. Increasing the frequency of seal servicing will minimize the plunger [piston] rod wear. |
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| Drain Plug or Oil Gauge leaking |
| These items seldom need servicing. Check to see if they are properly tightened. If crankcase oil becomes contaminated, it is recommended to replace the o-rings on the drain plug and oil gauge. Exercise caution when installing to avoid cutting the o-ring. Hand torque to specifications in torque chart. |
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| Worn crankcase oil seals |
| The crankcase oil seals should be inspected each time the Lo-Pressure and Hi-Pressure seals are serviced. Typically the oil seals are replaced from the drive-end and done when bearings and crankshaft oil seals are replaced. The new crankcase Oil Seal should be installed with the "spring towards the crankcase. Prolonged operation with worn Lo-Pressure and Hi-Pressure seals will permit liquid to travel back along the plunger [piston] rods towards the crankcase oil seals. Service the seals more frequently to prevent this premature failure of the oil seal. |
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| Worn crankshaft oil seals |
| With a regular maintenance schedule and oil changes, the crankshaft oil seals will not require regular maintenance. Periodically inspect your crankcase oil and crankshaft oil seals. Typically crankshaft oil seals should be replaced with a bearing replacement or if the oil becomes contaminated. Use CAT PUMPS special, custom-blend, ISO-68, petroleum-based, premium-grade hydraulic oil with anit-wear, rust inhibitors and other special additives for optimum lubrication and life. |
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