Pump without any pressure, Need check...

It sounds obvious, but directional controls are often changed inadvertently without the knowledge of maintenance personnel. It takes no time to verify the position of manual controls and check the settings of electrically operated solenoid controls, but you will feel a lot better if you do that, instead of replacing a perfectly good pump.

Restrictions and blockages can hinder the fluid flow to your pump, leading to poor fluid flow. This can be caused by an air leak in the suction line, air present in the pump at startup, insufficient oil supply in the pump, clogged or dirty fluid filters, clogged inlet lines or hoses, and a blocked reservoir breather vent. Low oil level in the reservoir can also contribute to these issues.

Now that we’ve ensured that the directional control is not reversed, it’s time to check that the drive motor itself is turning in the right direction. Sometimes incorrect installation leads to mismatched pipe routings between control valves and motors, which can reverse the direction of flow. Check to see that the motor is turning the pump in the right direction and if not - look at your piping.

Check to ensure that your pump drive motor is turning over and is developing the required speed and torque. In some cases, misalignment can cause binding of the drive shaft, which can prevent the motor from turning. If this is the case, correct the misalignment and inspect the motor for damage. If required, overhaul or replace motor.

Check to ensure the pump to motor coupling is undamaged. A sheared pump coupling is an obvious cause of failure, however the location of some pumps within hydraulic systems makes this difficult to check so it may go overlooked.

It is possible that the entire flow could be passing over the relief valve, preventing the pressure from developing. Check that the relief valve is adjusted properly for the pump specifications and the application.

Seized bearings, or pump shafts and other internal damage may prevent the pump from operating all together. If everything else checks out, uncouple the pump and motor and check to see that the pump shaft is able to turn. If not, overhaul or replace the pump.