Husky Husky Air-Operated Diaphragm Pump 1590 1590

Open the dispensing valve, if used.

Open the fluid drain valve to relieve all system pressure, having a container ready to catch the drainage.

Remove the six screws, air valve cover, and gasket with a Torx (T20) screwdriver or 7 mm (9/32 in.) socket wrench.

Move the valve carriage to the center position and pull it out of the cavity.

Remove the valve block and O-ring from the carriage.

Pull the pilot block straight up and out of the cavity using a needle-nose pliers.

Warning: To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure

Open the fluid drain valve to relieve all system pressure

Remove the pump from its mounting

Using a 10 mm socket wrench, remove the eight bolts holding the outlet manifold to the fluid covers

Remove the seats, balls, and O-rings from the manifold

Turn the pump over and remove the bolts and inlet manifold

Remove the seats, balls, and O-rings from the fluid covers

Check all hoses for wear or damage

Check all threaded connections are tight and free of leaks

Tighten or retorque as necessary

Retorque fasteners every two months

Sign off on the threaded connections tightening

Open the fluid drain valve to relieve all system pressure

Remove the manifolds and disassemble the ball check valves

Remove the screws holding the fluid covers to the air covers

Unscrew one outer plate from the diaphragm shaft

Remove one diaphragm, and the inner plate

CAUTION: Do not over-lubricate the pump. Oil is exhausted through the muffler, which could contaminate your fluid supply or other equipment. Excessive lubrication can also cause the pump to malfunction.

The air valve is designed to operate unlubricated.

Is the pump air inlet free from any obstructions?

Enter the number of operation hours since the last lubrication

If lubrication is desired, remove the hose from the pump air inlet and add two drops of machine oil to the air inlet every 500 hours of operation (or monthly).

Sign off on the pump lubrication