Graco Diaphragm Pump 1590HSPSP3ASSASSPTPSEP21

Tools Required: Torque wrench, 19 mm open end wrench, O-ring pick, Lithium base grease

Disassemble the Overmolded Diaphragms

Followed the Pressure Relief Procedure

Removed the manifolds and disassembled the check valves

Removed the clamps from the fluid covers

Removed the fluid covers off of the pump

Loosened and removed one diaphragm assembly

Removed the opposite diaphragm assembly and shaft out of the center housing

Inspected the diaphragm shaft for wear or scratches

This applies to FK, PS, and SP diaphragms.

NOTE: Overmolded diaphragms are covered in Overmolded Diaphragm Repair, page 16.

• 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.

Followed the Pressure Relief Procedure

Noted the connection locations of the leak detector wires

Disconnected the leak detector wires

Removed the leak detector from the bushing in the air side diaphragm cover

Do you want to remove the other leak detector from the other air side diaphragm cover?

Installed the leak detector in the bushing

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

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.