Graco Diaphragm Pump 1590HSPS01ASSBSSPTPSEP21

• Torx (T20) screwdriver or 7 mm (9/32 in.) socket wrench

Air valve repair kit 255122 is available. Use all parts in the kit for best results.

1. Follow the Pressure Relief Procedure, page 9.

Obtain a small container of the product being pumped to test the leak detectors.

Perform the Pressure Relief Procedure

Unscrew the leak detector bushing from the air side cover.

Dip the bushing, with the leak detector still installed in it, into the product container in an orientation that mimics how it would be oriented in the air side diaphragm cover. Observe whether the leak detector senses the presence of the product.

If the leak detector successfully detected the product, clean the bushing and leak detector and re-install the leak detector and bushing into the air side diaphragm cover.

NOTE: If the leak detector fails to sense the product, troubleshoot the leak detector to see if the leak sensor has failed or the leak detector is unable to detect the product.

To return the current leak detector to the pump:

If the leak detector needs to be installed in the bushing, simply screw the leak detector in just past finger tight.

NOTE: If using the ATEX leak detector, install the o-ring onto the leak detector before installation into the bushing.

Pressure Relief Procedure followed

Note the connection locations of the leak detector wires

Leak detector wires disconnected

Leak detector removed from the bushing in the air side diaphragm cover

Remove the other leak detector from the other air side diaphragm cover?

Leak detector installed in the bushing

NOTE: Do not remove undamaged bearings.

NOTE: Kits are available for new check valve flappers, or check valve balls in a range of materials. Gasket kits also are available.

1. Follow the Pressure Relief Procedure, page 9 . Disconnect all hoses.

2. To drain the pump, pull the frame quick-release pins (207) and rotate the pump.

NOTE: After draining, rotate the pump to positions which will aid disassembly.

3. Remove the clamps (23) on the outlet manifold (17) and remove the manifold.

NOTE: Use care while removing manifolds to safely remove check valve components.

4. Remove remaining clamps, manifolds, gaskets and check valves.