Repair; Stainless Steel Fluid End Repairs - Graco Mongoose Series Instructions - Parts Manual

Repair

Stainless Steel Fluid End
Repairs
NOTE: The following procedures apply only to models
with stainless steel fluid ends (A21000, A21001,
A21004, and A21016).
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 (10) from the fluid
end (9).
7. Remove the fluid end from the motor assembly (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 (9) and the four screws (10).
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 (10) after the pump's
initial week of operation.
3A4131H
Replacing the Inlet 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 inlet
valve (2); or elbow fitting (11), if attached.
6. Remove the elbow fitting (11), if attached. Inspect
and replace, if necessary.
7. Remove the inlet valve (2) from the fluid end (9).
Inspect the inlet valve and replace, if necessary.
8. Apply PFTE tape on the threads of the inlet
valve (2).
9. Reattach the inlet valve (2) to the fluid end (9).
NOTE: The inlet valve (2) has flow arrow that must point
towards the fluid end (9).
10. Reattach the elbow fitting (11), if used, to the inlet
valve (2).
11. Reconnect the shutoff valve (C).
12. Reconnect the power (B).
13. Prime the Pump, page 9.
Repair
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