It is always good practice to ensure all fastenings are tight and correctly torqued up, especially the main 'One Nut' on the Flotronic Range.
A good place to start if the problem has appeared on an existing pump is by asking the question; Has The Application Changed? Try and get the history of the pump and application and try to establish if anything has anything changed; for example, product being pumped, flow rates required, process pipework, cleaning procedures, air supply?
Has the pump recently been inspected or maintained, was it working before it was stripped down and rebuilt? Not working after a rebuild is an obvious 'red flag' for incorrect assembly.
WHAT TO DO IF AODD PUMP WON'T CYCLE
Check all valves are open
Air Supply Line
Check you have enough air available, Air Operated Pumps can be easily starved of air, and simply increasing the air line size or the volume of air available can solve many issues.
Check that the main airline isn't kinked, and that there are no air leaks.
Tie Rod - Ensure all airways in the Tie Rod are clear.
Check the Silencers fitted to the Air Valve - Blocked Silencers will stop the pump from Cycling - 'Iced Up' Silencers can have the same effect.
WHAT TO DO IF AODD PUMP WON'T PRIME
Check the application is within the pumps capabilities - majority of 'One Nut' pumps have a 3.6m Dry Suction Lift.
Check all process pipework valves are open
Closed valve in suction pipework will stop pump priming.
Closed valve in delivery pipework can cause an 'air lock' which can stop pump priming.
Check there are no leaks in the suction pipework - any leaks can result in air getting into the pipework instead of product.
Check the suction pipework is reinforced and able to take the vacuum without collapsing and that there are no kinks in the pipework between the source and the pump.
Check Suction Pipework is the right diameter and length for the application - thicker more viscous materials will need larger diameter and short runs between the source of the liquid and the pump.
It is also good practice to start the pump slowly when dealing with high viscosity products. This allows the pump to prime, and once primed the pump can be sped up to reach the most efficient pump operation.
Ensure that any filter in the Suction Line is clear.
Check Pump internals for wear, and replace as necessary:
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