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[Cached Version]
Published on: 6/11/2001
Last Visited: 12/31/2002
Lubrication is as important as cleaning with piston pumps, emphasized Pam Melton, product manager for the painting systems division of Campbell Hausfeld in Mount Juliet, TN.
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Melton said that if what's causing it to not work is the motor, it's time to get a new sprayer-the money required to fix the motor isn't cost-effective.
6 Don't adjust your packing."Different types of machines, like HVLP, have adjustments for packing and packing wear," said Melton."And they never touch it-never adjust it.It's a tensioning device: As the soft items inside the piston pump wear, this will retension them, so you will have good seals and they continue to make pressure correctly.Some people won't touch it from the day they buy it until the day it's too late."
Painters also continue to spray away after the packings and pumps start to wear, instead of bringing it in for a repack, added Huml."They continue to use it until it starts to do damage to a hard part, like a cylinder or a rod," he explained.
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Spraying a fence or a deck with bleach to get rid of mold and mildew may seem like a quick solution, but "bleach just attacks the airless spray hose," said Melton."Contractors will also use a coating that pushes a sprayer to its limit, like dryfall.You can put it through a sprayer, but the quality of the coating is very abrasive, so when you're done with that job, you're going to have to rebuild that pump."Melton recommended checking with equipment manufacturers before putting an unusual coating through a sprayer, and keeping replacement parts on hand, instead of "waiting until the next job and finding out their sprayer doesn't work."
8 Drown sprayer parts in solvent.
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Pam Melton's not too sure."We know plenty of people who spray everything out of one sprayer.You just have to be really, really careful to flush it as much as possible."She added that a contractor might want to keep a different gun and hose for use on oil-base vs. water-base."It's not necessary to have two different pumps; you can flush that pretty quickly.But hoses hold a lot of residue, as do guns."
11 Don't strain your paint.Silas points out that little particles and dried paint skins will soon gum up the works.Straining "will keep the unit going," he noted.
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Melton also cited giving access to temporary summer help who don't really know how to use the equipment as a recipe for disaster.
And how long should your equipment last, given all these considerations?Again, estimates vary.
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Diaphragm sprayers can last a lifetime, believes Melton."The parts that go out are the valves, which need replacement every 300 to 400 gallons," she explained."The diaphragm, every 1,000 to 2,000 gallons.The rest of the parts don't experience a ton of wear."