If the noises are coming from inside the sliding vane pump and sound like the pump has gravel in it, the pump is most likely suffering from cavitation. Cavitation is a result of a larger pressure drop on the pump. First, check that the pump suction piping is not undersized and does not have high pressure drop equipment like a globe valve. Second, verify that the pump is not operating at too high of a speed. Try slowing the pump down. Third, verify that the pump is not too far from the fluid source. If so, try to move the pump closer to the source.
If the noises are coming from inside the vane pump and sound like a loud humming noise, turn the pump off immediately. The pump is likely operating at a dead head condition and building up pressure on the discharge side of the pump. First check the discharge piping and make sure all valves are open and no product has built up in the piping. Second, check the relief valve of the pump and make sure it is still operational. If the system requires frequent dead heads, a properly operating relief valve is a necessary safety feature. If the relief valve components appear to be unworn, verify that the pressure setting of the RV is correct.
If the piping on the discharge side of the vane pump is excessively shaking, the piping system is likely not secured for the speed the pump is operating at. Verify that the piping is properly secured in the system. Make sure the pump isn't operating at too high of a speed. And verify the piping is not too restrictive for the application.
If the vane pump is excessively shaking, the pump is likely not in a secure location. Verify the pump is securely mounted on a baseplate or skid.
If the vane pump is making loud banging noises, turn the pump off immediately. It is likely that the pump is not aligned properly. Verify that the pump, reducer and motor are all aligned properly. Verify that the shaft is not bent and that the couplings are not misaligned. Verify that the bearings are not excessively worn or damaged.
If the vane pump is making loud screeching sounds, there is likely internal damage within the pump. Verify that there is no internal damage to the vanes, liner or rotor. Also make sure there are no solids stuck in the pump wetted path.