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11. POSSIBLE FAILURES, CAUSES, SOLUTIONS

Possible failures and solution strategies are listed in the table below. Please apply to the Customers’ Service Department of our company when a

generic solution is not found to your problem.

While the failures are repaired the pump must always be dry and un-pressurized.

POSSIBLE FAILURE

CAUSES

SOLUTIONS

The pump delivers insufficient capacity

 Discharge head too high

 Very high counter pressure

 Pump and/or pipe cannot discharge air,

cannot suck

 Occurrence of air pockets inside the pipe

 NPSH is too low

 Readjust the operating point

 See if there is any undesired material

inside the pipe

 Vent completely the pump and the pipe

 Change the piping configuration

 Increase the liquid level

Motor overload

 System pressure is lower than the

requested pressure level

 Speed too high

 Liquid pumped of different specific gravity

and viscosity than that for which pump is

rated

 Engine works at two phases

 Adjust the operating pressure to the

label value

 Decrease the speed

 Increase the engine power

 Replace the fuse and control the

electrical connections

Pump head is too high

 System pressure is higher than the

requested pressure level

 Set the operating pressure to the label

value

Bearing temperatures are high

 Worn out coupling

 Too much, too little or improper

lubrication

 Increase in axial forcing

 Replace the coupling

 Change the oil, decrease or increase its

quantity

 Clean the balance holes on the impeller

disc

Excessive leakage from the stuffing box

 Worn out gland

 Loose gland

 Use brand new gland

 Change the stuffing bush

 Tighten the gland nuts

Noisy operation

 Worn out motor or pump ball bearings

 Cavitation

 Worn out or misaligned coupling

 Operation in the far left or right of the

performance curve

 Replace

 Close the delivery partially in order to

reduce the capacity.

 Replace the coupling or align it

 Operate the pump at its label setting

Excessive increase in pump temperature

 Pump and/or pipe can neither discharge,

nor aspirate air

 Too low capacity

 Bleed completely the pump and the

pipe

 Open more the valve

Vibration

 Pump and/or pipe can neither discharge,

nor aspirate air

 NPSH is too low

 Internal components of the pump are

worn out

 System pressure is lower than the

requested pressure level

 Coupling is misaligned

 Too much, too little or improper

lubrication

 Rotor unbalanced

 Improper bearings

 Bleed completely the pump and the

pipe

 Increase the liquid level

 Replace the worn out components

 Adjust the operating pressure to the

label value

 Align the coupling

 In case of continuous overload,

decrease the impeller diameter

 Change the oil, decrease or increase its

quantity

 Balance the impeller again

 Use new bearings

Brand	MAS
Model	DAF YPSP Series
Category	Water Pump
Language	English

MAS DAF YPSP Series User Manual

Table of Contents

Questions and Answers:

MAS DAF YPSP Series Specifications

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