Hitachi 231580 Flushing, When to Flush, How to Flush, Follow the Pressure Relief Procedure on

Flushing

When to Flush

1.Before using a new sprayer: flush out the oil which was left in to protect pump parts.

Before using water-base paint: flush with min- eral spirits followed by soapy water, and then a clean water flush.

Before using oil-base paint: flush with mineral spirits only.

2.Changing colors: flush with a compatible solvent such as mineral spirits or water.

3.Changing from water-base to oil-base paint: flush with warm, soapy water, and then mineral spirits.

4.Changing from oil-base to water-base paint: flush with mineral spirits, then warm, soapy water, and then a clean water flush.

5.Storage after using water-base paint: flush with water and then mineral spirits. Leave the system filled with mineral spirits. Relieve pressure. Leave the drain valve open.

Storage after using oil-base paint: flush with mineral spirits. Relieve pressure. Leave the drain valve open.

CAUTION

Never allow water to freeze in the pressure control. Doing so prevents the sprayer from being started and may cause serious damage. Push the water out with mineral spirits.

6.Startup after storage. Before using water-base paint, flush out the mineral spirits with soapy water and then clean water. When using oil-base paint, flush out the mineral spirits with the paint.

How to Flush

1.Follow the Pressure Relief Procedure on page 9.

2.Remove the spray tip and clean it separately.

3.Pour one-half gallon (2 liters) of compatible solvent into a grounded metal flushing pail. Put the suction hose in the pail.

4.Open the pressure drain valve. See Fig. 5, page 7.

5.To save the paint still in the pump and hose, follow Step 6, except put the drain tube in the paint pail. When solvent appears, close the drain valve. Put the drain tube in the flushing pail. Trigger the gun into the paint pail. When solvent appears, release the trigger. Continue with Step 6.

WARNING

FIRE AND EXPLOSION HAZARD

To reduce static sparking and splashing, always remove the spray tip from the gun, and hold a metal part of the gun

firmly to the side of a grounded metal pail when flushing.

6.Lower the pressure setting. Turn on the sprayer. Maintaining metal-to-metal contact, trigger the gun into the flushing pail. Slowly increase the sprayer pressure until the pump starts. Keep the gun triggered until the solvent flows freely from the gun. Circulate the solvent to thoroughly clean the sprayer. Release the gun trigger. Engage the gun trigger safety.

7.Open the drain valve and circulate the solvent through the drain tube to thoroughly clean it. Close the drain valve.

8.Remove the suction hose from the pail. Disengage the gun trigger safety. Trigger the gun and run the pump a few seconds to push air into the hose. Do not run the pump dry for more than 30 seconds to avoid damaging the pump packings! Relieve pressure.

9.Remove and clean the inlet strainer. Wipe paint off the suction hose and drain tube.

10.Refer to When To Flush, Step 1 again. Relieve pressure.

11.Leave the drain valve open until you use the sprayer again.

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