Plastic Fluid End Repairs - Graco Mongoose Series Instructions - Parts Manual

Repair
Replacing the Outlet Valve
1. Follow the Pressure Relief Procedure, page 9.
2. Flush the Equipment, page 9.
3. Disconnect the power (B).
4. Close the inlet shutoff valve (C).
5. Disconnect the shutoff valve (C) from the outlet
valve (3).
6. Remove the outlet valve (3) from the fluid end (9).
Inspect and replace, if necessary.
7. Apply PTFE tape on the threads of the outlet
valve (3).
8. Reattach the inlet valve (3) to the fluid end (9).
NOTE: The outlet valve (3) has flow arrow that must
point away from the fluid end (9).
9. Reconnect the shutoff valve (C).
10. Reconnect the power (B).
11. Prime the Pump, page 9.
Replacing the Prime/Bleed Valve
1. Follow the Pressure Relief Procedure, page 9.
2. Flush the Equipment, page 9.
3. Disconnect the power (B).
4. Close the inlet shutoff valve (C).
5. Remove the prime/bleed valve (4) from the fluid end
(9). Inspect and replace, if necessary.
6. Apply PTFE tape on the threads of the prime/bleed
valve (4).
7. Reattach the prime/bleed valve (4) to the fluid
end (9).
8. Reconnect the power (B).
9. Prime the Pump, page 9.
14

Plastic Fluid End Repairs

NOTE: The following procedures apply only to models
with plastic fluid ends (A21008, A21009, A21010,
A21011, A21012, A21013, A21014, A21015).
Replacing the Diaphragm
1. Follow the Pressure Relief Procedure, page 9.
2. Flush the Equipment, page 9.
3. Disconnect the power (B).
4. Drain the fluid from the outlet fluid line (E).
5. Disconnect the outlet fluid line (E).
6. Remove the four fluid end screws (110) from the
fluid end (109).
7. Remove the fluid end (109) from the motor assem-
bly (1).
8. Unscrew the diaphragm (7) counterclockwise from
the pump shaft.
9. Inspect the pump shaft and support ring (8) for dam-
age.
10. Screw the new diaphragm (7) clockwise onto the
pump shaft.
11. Replace the fluid end (109) and the four screws
(110). Tighten the screws evenly.
12. Reconnect the outlet fluid line (E).
13. Reconnect power (B).
14. Prime the Pump, page 9.
NOTE: Tighten fluid end screws (110) after the pump's
initial week of operation.
3A4131H