262 rows  Replace paint with paint recommended for airless spraying for best results. Jul 18, 2013  I have a Campbell Hausfeld 1/2HP airless paint sprayer. I had used it for years and then it sat for a while. I went to use it again and it didn't have the suction. Need to fix your AL (Series) Airless Paint Sprayer? Airless Paint Sprayer Wont Prime. A repair kit for my Campbell Hausfeld airless paint sprayer Al.

Push pin into place and secure with spring retainer. Check for motor damage. Remove drive housing assembly. Try to rotate motor fan by hand. Replace motor if fan won't turn. Check electrical supply with volt.

Piston rod worn. Replace piston rod. The motor operates, but the paint pump doesn't. The pressure setting is too low. Increase the pressure.

Air in oil system. Check oil level & bleed system. Inlet valve worn. Check and replace per manual. Outlet valve worn. Check and replace per manual.

The displacement is seized by dried paint. Service the pump.

Pump inlet strainer dirty. Clean or temporarily remove. Valve balls or seats worn or dirty. Replace or clean. 4.Air in pump or hose. Hold spray gun trigger in open position and run about 10 seconds until air is purged. Check for siphon tube leak.

Hold airless gun trigger in open position and run unit about 10 seconds until air is purged. Check for siphon tube leak. Packings worn. Fluid too viscous. Prime pump with compatible solvent. Bring up to pressure, carefully remove pump from solvent container and immerse inlet tube into heavy to be sprayed. With nozzle tip removed, trigger gun until heavy material appears at gun.

Allow motor to cool. Correct cause of overheating. If switch remains open after motor cools, replace motor. Remove pressure control and check micro switch operation with ohmmeter. With pressure knob at lowest setting and stem pushed into control, readings should be: white & black = 1 ohm max. White and red = open. With pressure knob at highest setting, reading should be: white and black = open; white and red = 1 ohm max.

See if you can loosen the ball. If you can't loosen it, take the pipe apart, but be careful because the ball has to fit perfectly to hold the high pressure of a paint sprayer.

If you can't loosen it, take the pipe apart, but be careful because the ball has to fit perfectly to hold the high pressure of a paint sprayer. If you can get the machine to prime, then tap the next ball to see if machine will fill the hose.

Bring up to pressure, carefully remove pump from solvent container and immerse inlet tube into heavy to be sprayed. With nozzle tip removed, trigger gun until heavy material appears at gun. Replace nozzle tip and you're ready to spray. Siphon tube clogged. Remove and clean.

Bleed air from system. Pressure valve not adjusted or worn.

The displacement pump operates, but the output is too low on the down stroke or both strokes. The lower check valve ball is not seating properly. Service the lower check valve ball check. The displacement operates, but the output is too low on the upstroke. The upper check valve ball is not seating properly. Service the upper check ball valve.

Check for debris trapped on seat. Tighten to 185 in-lb.

If hot, turn 'off'. Let cool & check motor case before starting. Hums, but does not start or run correctly. Pump under pressure.

Check for debris trapped on seat. Tighten to 185 in-lb. Clean valve and replace with a new gasket and sealant. Transducer leaks.

Drips while spraying. Spray tip worn. Sprays uneven. Dried paint in spray tip.

Check extension cord and house circuit. Metal object being painted not grounded. Attach ground wire to object. Material will not shut off at spray tip of Airless Gun.

Change to smaller tip. Leak in siphon tube. Check siphon hose and others in system. Too many airless guns for pump.

Low voltage at wall plug. Test power supply voltage. Bad On-Off switch. Take to authorized service center. Damaged motor cord or extension cord, or voltage too low. Motor problem.

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Use #12 gauge wire or larger up to maximum of 200 feet. For additional length, more airless hose may be used. Unit will not prime. Dried out packings or stuck valve balls. Remove siphon tube and feel lower ball check to be sure it is free to move off its seat.

Check house electrical fuse (use at least a 15 amp). Thermal overload switch. Unit under pressure. Turn bypass valve to prime. Defective switch or wiring. Replace switch, check wiring; replace if necessary. Airless gun will not spray.

Fluid pressure. Check pressure knob setting. The pump won't develop much pressure if it is at minimum setting (fully clockwise). Slowly increase pressure setting to see of motor starts. Check for a clogged spray tip or fluid filter, if used.

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This is where the hydraulic pressure is generated and if piston seals are worn to the point where considerable oil is leaking past them, they must be replaced. 1.(continued) The other location is the diaphragm. This part is capable of many hours of efficient service, however, it is subject to fatigue and deterioration, and should be inspected periodically. Pressure blisters, regular or irregular pattern are normal, however, if diaphragm is encrusted with dried paint or is hard and stiff from use and exposure to paint chemicals, it should be replaced with repair kit. Replacement every year of use is recommended. Insufficient or no pressure.

Worn 'O' Rings. Repack or replace transducer. Fluid leakage at upper end or fluid section. Upper packings. Relieve pressure and tighten packing take up nut or replace packings.