SYMPTONS OF INTERNAL GEAR PUMP FAILURE AND ITEMS TO CHECK
| HYDRAULIC |
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| SYMPTON: Pump turns, but no flow |
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| Possible System Issue | Possible Pump Issue | Possible Drive Issue |
| • NPSHa not sufficient • Air leaks into pump • Pump has run dry • Suction valve not open • Discharge valve not open • Clogged strainer • Supply tank empty |
• Incorrect rotation • Incorrect head placement • Wrong clearance setting for application • Worn pump internals • Incorrect speed (lower speed) |
n/a |
| SYMPTON: Low capacity |
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| Possible System Issue | Possible Pump Issue | Possible Drive Issue |
| • NPSHa not sufficient • Air leaks into pump • Pump has run dry • Liquid temperature higher than expected • Pump running too fast for application • Abrasives present / parts not hardened • Suction valve partially open • Clogged strainer |
• Incorrect head placement • Wrong clearance setting for application • Worn pump internals • Relief valve improperly set • Incorrect speed (lower speed) |
• Drive incorrectly sized for horsepower requirement |
| SYMPTON: Pump will not develop sufficient pressure |
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| Possible System Issue | Possible Pump Issue | Possible Drive Issue |
| • Air leaks into pump • Pump has run dry • Liquid temperature higher than expected • Suction valve partially open • Clogged strainer |
• Incorrect head placement • Wrong clearance setting for application • Worn pump internals • Relief valve improperly set |
• Drive incorrectly sized for horsepower requirement |
