IMPELLER 3521637 - Caterpillar

Hydraulic Pump Troubleshooting
ProblemThe pump is excessively noisy.Probable Cause
The pump is cavitating.
The oil is too thick.
The ambient temperature is too low.
There is air in the hydraulic oil.
The pump is worn or damaged.ProblemThe pump is excessively hot.Probable Cause
The hydraulic oil has overheated.
There is internal leakage.
The oil cooler is plugged.
The pump is cavitating.
There is air in the hydraulic oil.
There is excessive load on the pump.
The pump is worn or damaged.ProblemThe hydraulic oil is overheated.Probable Cause
The system pressure is too high.
The fluid is dirty.
The fluid level is low.
The fluid viscosity is incorrect.
The hydraulic oil cooler is plugged or dirty.
The pump is worn or damaged.ProblemThere is no hydraulic oil pressure.Probable Cause
There is no hydraulic oil flow.ProblemThere is no hydraulic oil flow.Probable Cause
The EDC has failed.
The hydraulic pump is not receiving fluid.
The pump is damaged.
The pump is improperly assembled.
The level of the hydraulic fluid is low.
The hydraulic line is plugged.ProblemThe hydraulic oil flow is low.Probable Cause
The fittings are loose.
There is an external leak in the hydraulic system.
The gaskets and the seals in the pump leak.
The pump is worn.ProblemThe hydraulic oil pressure is erratic.Probable Cause
There is air in the hydraulic oil.
The hydraulic oil is contaminated.
The pump is worn.Troubleshooting for the Asphalt Emulsion Pump
ProblemThe pump is excessively noisy.Probable Cause
There is air in the system.
The bearings are worn.
The coupling is worn.
The suction lines or the discharge lines are improperly supported.
Vacuum condition
The pump or the drive is not properly mounted.
The oil is too thick.
The impeller is worn or damaged.
The ambient temperature is too low.ProblemThe bearings are too hot.Probable Cause
The lubrication is incorrect.
High temperature grease was not used.
The pump speed is too high.ProblemThe system is not developing flow or pressure.Probable Cause
The impeller is worn or damaged.
The speed of the pump is too low.
The suction lift is too high.
The liquid that is pumped is too thick.
The seal is worn and leaky.
The pump gasket leaks.
The relief valve is open.
There is an internal loss of oil.
The strainer for the inlet is plugged.ProblemThe pump does not turn.Probable Cause
The shaft key is sheared.
The drive mechanisms are broken or disconnected.ProblemThe relief valve for the asphalt emulsion remains open.Probable Cause
The nozzle is plugged.
The emulsion viscosity is too low.Note: Low viscosity can also cause the pressure compensator spool to open. When the pressure compensator spool is open, the flow is reduced.Flow Meter Troubleshooting
ProblemFlow is not indicated at the flow meter, and there is no flow from the asphalt emulsion pump.Probable Cause
The controller is not properly calibrated.
There is no flow from the hydraulic system.
The EDC has failed.
There is low voltage at the EDC from the controller.
The inlet valve is partially closed or completely closed.
The rate of flow is set too low.
The circuit breaker is tripped.
There is no power to the control module.ProblemFlow is not indicated at the flow meter, but the additive pump continues to provide flow.Probable Cause
The flow meter is faulty.
There is no power to the flow meter.
The controller is faulty.
The electrical connections on the controller are loose.
There is less than 15 percent of water content in the asphalt emulsion.
The signal wire from the flow meter to