See full version: Troubleshooting a Diaphragm Pump
Double-diaphragm pumps come in all shapes and sizes, based on the application and fluid requirements. Larger AODD pumps (1-inch and greater) require more compressed air and larger air lines than smaller pumps to operate at full capacity.
The appropriate air line size for a pump is located in the manufacturer’s installation and operation manual. As a general guideline for AODD inlet air line sizes, match the air line hose size to the air inlet port size on the
air valve.
After properly torquing the pump according to manufacturer recommendations and ensuring all sealing O-rings have been replaced after service, the AODD pump should be leak-free. Save significant rebuild time later on by ensuring the PTFE O-rings are replaced when the pump is rebuilt. here
The diaphragm is made of a rubbery material. With constant exposure to fuel and heat, it can stiffen or dry rot. It needs to remain flexible to do its job properly. Going bad may not have anything to do with something you've done wrong or faulty parts, but is likely the result of regular use. If the diaphragm becomes stiff or cracked, it will put too much fuel into the engine. The excess smoke that accompanies it is fuel burning off, while the revving and stopping is caused by flooding in the engine. here
Fortunately, a diaphragm can be replaced without replacing the entire carburetor. To access it, you must remove the air filter and the bolts holding the carburetor onto the mower. The carburetor is either on top of the fuel tank or right next to it, depending on which series of the Briggs & Stratton 550 your have. Screw off the bottom of the carburetor to reveal the rubber gasket and diaphragm. One corner of the diaphragm has a spring. When you squash it in, it should bounce right back and have good spring. There should be no cracks and the rest of the diaphragm should be pliable. If it is rotting or has some damage, pry it off and replace it with a new one. Carburetor rebuild or repair kits will provide a new diaphragm as well as other replaceable parts.
The symptoms of a bad diaphragm are similar to other mower problems. Refusal to start or cutting out during running may be the first sign of a problem. The mower may smoke excessively or sound sluggish. At high speeds, the motor is more likely to give out or seem like it is starving or flooding. Conversely, the idle speed may be higher than normal and the mower may rev up and down on its own. The symptoms are not exclusive and a mower may have any combination of them.
The diaphragm on a Briggs & Stratton 550 lawn mower engine is part of the carburetor. A carburetor's job is to gather the fuel and mix it with air before delivering it to the engine. It delivers different ratios of gas and air, depending on the running speed. The diaphragm helps to regulate the fuel in the mixture. When the diaphragm is bad, the lawn mower will not run smoothly.
A few other lawnmower problems may have some of the same symptoms as a bad diaphragm, particularly the difficulties with starting and sputtering. A bad spark plug can cause many problems. This is one of the easiest fixes, because all you have to do is unscrew and replace the spark plug on the outside of the mower. The starter assembly may also have some complications. The rope should pull smoothly and begin the internal spinning within the first few inches of rope. If it does not, the rope may be tangled or the spring may be broken. Poor compression may also be at fault. Briggs & Stratton recommends visiting an authorized service center for compression testing on its engines. here
How do I return a pump for repair?
Since the founding of ADI in 1971, Dia-Vac® pumps have run flawlessly where many other pumps have failed. These rugged pumps are designed to operate continuously in some of the toughest chemical process and environmental applications worldwide. With the proper pump selection your pump will also run without complications. here
Diaphragm life has many variables. We recommend the inspection of diaphragms every 4-6 months for continuous duty applications. The major contributors to diaphragm failure are pressure, temperature, moisture and type of gas being sampled.
What is the standard lead time for an ADI pump? more
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We offer Aluminum, 316 ss, Hastelloy-C, (with Teflon-coating available on each one) as well as a Solid Teflon head option for extremely corrosive applications. here
Installation of pulsation dampeners should be a priority if you want to help maximize your rigs’ production and improve equipment efficiency. Just make sure the product quality is top-level so you can eliminate maintenance demands and get the most out of your investment. [links]
REDUCED DAMAGE, INCREASED PROTECTION. Pulsation dampeners don’t just improve efficiency–they also extend the service life of your pumps and pipe system.
Keeping your rigs running smoothly doesn’t just involve making carefully planned decisions and enlisting top-notch talent for your A-team. You need to make the most of your drilling equipment investment, which means ensuring your mud pump system provides reliable performance and superior efficiency. here
If your system has reciprocating positive displacement pumps, pulsations and hydraulic shock will naturally result. They may even occur when pump check valves are opened and closed. When left unaddressed, pulsations and pressure gaps can damage the entire pump system over time. It pays to install pulsation dampeners at the discharge side of reciprocating PD pumps to mitigate these losses. here
Pulsation dampeners act much like a car’s shock absorber would, dampening resulting hydraulic shocks while controlling pipe rattle and pressure fluctuations in the system. By lowering the risk of shock and excess movement, they can minimize the damage to the pump system’s components, especially pipe welds and supports. here
Let’s learn more about this piece of equipment and why it’s important. [links]