Is this how your equipment looks?

Every pump will fail from time to time.  How do you know where to start troubleshooting the failure?

We at Detroit Pump are sharing our quick reference charts for troubleshooting Hydraulic and Mechanical pump failure. Here you’ll see some of the symptoms of pump failures and what the possible causes could be. Use these handy reference guides as a starting point to determine possible problems before tearing into the pump.  Save man hours and costs by not taking pumps apart until the possible causes are identified.


Symptoms & Causes of Hydraulic Pump Failures

Symptoms & Causes of Hydraulic Pump FailuresPump does not deliver liquidPump does not deliver sufficient capacityPump does not deliver sufficient pressurePump delivers flow intermittently
Pump not primed or prime lostxxxx
Suction and/or discharge valves closed or cloggedxx
Suction piping incorrectxxx
Insufficient NPSH availablexxx
Excessive air entrapped in liquidxxxx
Speed (rpm) too lowxxx
Incorrect rotationx
Broken impeller or bent vanesxx
Incorrect impeller or impeller diameterxx
System head too highx
Instruments give erroneous readingsxx
Air leak in suctionx
Impeller cloggedx
Pump assembled incorrectlyx

Hydraulic Pump Failures Symptoms Causesdownload
Hydraulic_Pump_Failures_Symptoms-Causes.pdf


Symptoms & Causes of Mechanical Pump Failures

Symptoms & Causes of Mechanical Pump FailuresBearings Run hot and/or fail on regular basisHigh rate of mechanical seal failurePacking has short lifePump vibrates at higher than normal levelsPump is drawing too much powerWear of internal wetted parts is accelerated 
Pump not primed or prime lost
Suction and/or discharge valves closed or cloggedx
Suction piping incorrect
Insufficient NPSH availablexxx
Excessive air entrapped in liquid
Speed (rpm) too low
Incorrect rotationx
Broken impeller or bent vanesxx
Incorrect impeller or impeller diameter
System head too high
Instruments give erroneous readings
Air leak in suction
Excessive shaft misalignmentxxx
Inadequate lubricationx
Lubricant contaminationx
Inadequate lubricant coolingx
Axial thrust or radial loads higher than bearing ratingx
Improper coupling lubricationxx
Suction pressure too highxx
Bearing incorrectly installedxx
Impeller out of balancexx
Overheating of seal facesx
Excessive shaft deflectionxx
Lack of seal flush at seal facesx
Incorrect seal installationx
Pumps is run dryx
Pump run off design pointxxxxx
Shaft/shaft sleeve wornxx
Packing gland not properly adjustedx
Packing not properly installedx
Impeller cloggedx
Coupling out of balancexxx
Baseplate not installed properlyxxx
Pump operating speed too close to system’s natural
frequency
x
Bearing failingxxx
Piping not properly anchoredxxx
Pump and/or driver not secured to baseplatexxx
Specific gravity higher than specifiedxxx
Viscosity higher than specifiedxxx
Internal clearances too tightxx
Chemicals in liquid other than specifiedx
Pump assembled incorrectlyxxxxx
Higher solids concentration than specifiedx

Mechanical Pump Failures Symptoms Causesdownload
Mechanical_Pump_Failures_Symptoms-Causes.pdf


In a future blog, we will break down some causes and how to start to dive deeper into finding the problem.  If you have a pump in trouble, we are here to assist you.

Summary
Symptoms and Causes of Hydraulic Pump Failure
Article Name
Symptoms and Causes of Hydraulic Pump Failure
Description
Detroit Pump’s quick reference charts for troubleshooting Hydraulic and Mechanical pump failure shows some of the symptoms of pump failures and what the possible causes could be.
Author
Publisher Name
Detroit Pump & Mfg. Co.
Publisher Logo