Polymer Pump

Check & Secure the Mounting Bolts
Excessive vibration and pump leakage can affect your mounting bolts. You should check that your mounting bolts are tight, secure, and have not corroded.
Checking your mounting bolts should form part of your annual maintenance schedule but may need to be done more often depending on your installation and pump.

Check for Fluid Leaks
Unexpected fluid leaks are not only messy, but they can result in reduced performance and a loss of pump output. Your pump is not designed to leak, so, if there's a leakage, it should definitely be investigated.
Pumps can suffer leakages from mechanical seals, stuffing boxes and flange gaskets, while pump motors can also experience oil leakages, so it's a good idea to check these as part of your monthly routine maintenance.

Check and Adjust Packing
If your pump is a packed pump, there should be some flow of process fluid coming through the packing, and there should be some fluid flow through the packing. Typically, manufacturers recommend 1 drip per 10 seconds; enough that you should see fluid coming through the packing, but it should not be excessive amounts of fluid. Use caution, as overtightening the packing can damage the pump shaft.
Packing also needs to be changed periodically. While inspecting the packing, verify that the pump shaft is not showing signs of wear from over-tightening or the packing has hardened from lack of fluid lubrication.

Check for Proper Oil Level, Oil Leaks & Grease
Insufficient or too much lubrication can cause bearing failure of your pump. Checking for oil leaks from the drive should be done as part of the annual inspection of your pump.
You should also check the gasket condition, and if there is a leak, you may need to replace the gasket or mechanical seal.
It's also important to maintain the correct oil level and use the correct grease and oil as specified in your operating manual.

Check the Pump Pressure and Flow
It's important to regularly check your discharge gauge to ensure your pump is operating with adequate pressure. The correct pressure will vary depending on the operating parameters of your pump, so it's best to check your operating manual. You should review your pump performance and compare it to the factory pump curve that would have been supplied with the pump.

Inspect the Temperature
The pump bearings keep the shaft axial end movement and lateral deflection within the proper limits for the impeller and shaft seal. It's possible that those parts can overheat, so you need to ensure your bearing temperature remains consistent. A lack of maintenance can result in premature wearing of your bearings.

Inspect & Clean Motor Vents
Dust and debris build-up can affect your pump's operation, so you should regularly check the motor for cleanliness. You'll need to shut the motor down and de-energize it first.
To remove the dirt, you can blow the dust off with a high-volume, low-pressure air blast. If the motor is very dirty, it may need to be sent to a motor shop to be professionally cleaned and dried.
Cleaning motor vents should form part of your preventative maintenance routine or part of a planned overhaul of your motor.

Inspect Condition of Pump Casing
The pump casing houses the pump impeller and rotating assemblies as well as retains pressure, so it's important to check it regularly for damage.
The conditions of your application may cause the casing to rust, crack, or discolour. Cracks can cause leakage and even contamination of the fluids being pumped.
You should check the condition of your pump casing as part of your monthly maintenance routine and inspect for signs of wear and tear or fatigue. If your pump casing is consistently suffering damage due to the environment in which it's operating, consider getting a pump manufactured with different materials more suited to withstand those conditions.