2-69. DIAPHRAGM PUMPS (CHEMICAL FEED PUMP) MAINTENANCE.
This task consists of:
General Mechanics Tool Kit (Appendix B, Section III, Item 4)
Rags, Wiping (Appendix C, Section II, Item 23)
Diaphragm - LD-BO-0010-HY-D
Diaphragm - LD-AO-0010-HE-D
O-ring (4) - ZM-PA-3908-VI-Y
Lockwasher (2) - MS35338-141
Power shutdown (power source manual).
ROWPU shutdown (TM 10-4610-240-10).
Chemical cans and frame removed (TM 10-4610-240-10).
a. Remove two nuts (20), lockwashers (19), screws (17) and bracket (16) from frame (18).
Removal of one diaphragm pump is shown. The other diaphragm pumps are similar.
b. Loosen clamp (2) and disconnect flexible hose (1) from reagent head (3).
c. Loosen clamp (5) and disconnect flexible hose (6) from reagent head (3).
d. Remove four screws (4) and separate reagent head (3) and attached parts from chemical feed pump (21).
e. Remove diaphragm nut (7), working diaphragm (8), backing plate (9) and outer adapter ring (10) from inner adapter
Mark location of four screws (11) to aid installation.
f. Remove four screws (11), inner adapter ring (12), guard diaphragm (13), and support disk (14) from actuating shaft