2-74. BACKWASH PUMP SUCTION AND DISCHARGE ASSEMBLIES.
a. General. The suction and discharge assemblies on the backwash pump are the pipes to which the input
hose and backwash strainer attach. This paragraph describes removal, cleaning, inspection, repair, and
installation of the suction and discharge assemblies.
b. Removal. (Figure 2-89)
If necessary, remove two straps (1) and backwash strainer (2) from backwash pump.
Unscrew hose plug (3) and let it hang.
Remove four nuts (4), four lockwashers (5), and four flat washers (6) from bolts (7).
Remove four bolts (7) and four flat washers (8) from backwash pump and flange (9).
Remove flange (9) and gasket (10) from backwash pump and discard gasket.
Remove adapter (11) from flange (9).
Unscrew hose plug (12) and let it hang.
Remove four nuts (13), four lockwashers (14), and four flat washers (15) from bolts (16).
Remove four bolts (16) and four flat washers (17) from backwash pump and flange (18).
(10) Remove flange (18) and gasket (19) from backwash pump. Discard gasket (19).
(11) Remove adapter (20) from elbow (21).
(12) Remove elbow (21) from nipple (22).
(13) Remove nipple (22) from flange (18).
(1) Remove dirt and rust from flanges, nipples, and adapters.
(2) Remove dirt and rust from bolts, nuts, and washers.
(1) Inspect flanges, nipples, and adapters for damaged threads.
(2) Inspect bolts and nuts for stripped heads and threads.
e. Repair or Replace.
(1) Replace damaged nuts, bolts, screws, and washers.
(2) Replace damaged flanges, nipples, adapters, and pipe fittings.
(3) Replace all gaskets.
(4) Repair backwash pump assembly and backwash strainer in accordance with paragraph 2-41.
(5) Repaint and reinstall pump assembly in accordance with Standard Operating Procedures.