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Signs of packing wear in airless spray pump lower

BlastOne’s Master Technician, Kerry Cooper, shows how to identify when airless spray pump lower packings are worn.


Hello, welcome to Blastone International instructional video In relation to repairing an airless pump leg.

How do I know when I need to replace the packings in a pump? The packing is a top and bottom. To understand the need to replace the packings, primarily, you’ll have material or paint escaping from this glen nut from the top of the pump. The glen nut itself creates pressure on the package.

What happens, ultimately, is the package will wear from not only the piston traveling through the package but also it’s indicative of the type of product you’re using. Some products are more aggressive on the packings and the pump as opposed to your lower volume solids products.

So, say for example, product with silicon in it, though some products that you put through this pump are quite harsh or cause premature wear on the packings. Products with calcium silicate, products with micaceous iron oxide, aluminium oxides. They all have a significant wear factor in relation to the longevity of the packings themselves.

The other indicator is of course, not only did I mention paint escaping from this glen nut but also too, you will see a significant drop in pressure.

So, how can I ascertain what the drop of pressure is? Well, predominantly, what you do is when you’re spraying, you’ll see the drop in pressure because the atomization from the tip to the surface of the material itself becomes diminished in the sense that the dry spray, it’s tends to follow the spray tip pattern.

Also too, you’ll have an undulating spray tip pattern. So, when I say undulating, it’ll come in and go out, come in, cut and, go out. That’s indicative of ball wear as well, which is top and bottom, with your primary ball, your secondary ball.

So, all of these factors are relative to wear within a pump itself. Primarily, though most of you would have experienced paint coming from the top of this glen nut. So, that being the case, you can with no pressure on the pump, increase some torque with the C-section spanner on this glen nut to try and talk it down a bit more to create a bit of squash on the packings, to reduce the bypass or product at the top of the glen nut.

If you’re unsuccessful in that and you’ve lost pressure, you can see that you have poor atomization. Ultimately, you need to replace the package within the pump.

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