CENTRIFUGAL PUMP (BACKWASH PUMP) MAINTENANCE - continued.
a. Remove drain cock (18), vent plug (16), and primer plug (15).
Note position of long screws.
b. Remove eight screws (4) and pump case (17).
Remove pump case gasket (14). Discard gasket.
Because of tight fit of wear ring in housing, wear ring must be removed in pieces Remove wear ring
only when excessively worn.
d. Position pump case (17) on drill press and drill two 3/16-inch (4 76 mm) holes in wear ring (13). Drill holes
on opposite sides of ring, not to exceed 3/4 inch (19 05 mm) deep.
e. Separate wear ring (13) and remove pieces from pump case (17).
Note position of key for assembly.
f. Remove impeller retaining screw (12), gasket (11), key (9), and impeller (10) from shaft of motor (1). Discard
g. Remove seal assembly (8) and cover (7). Discard seal assembly.
h. Remove four screws (6), adapter (5), slinger (3) and splash plate (2).
Drycleaning solvent P-D-680 is highly toxic and can ignite organic materials, nitrates,
carbides, and chlorates. Wear eye, skin, and respiratory protection. Use in a well-ventilated
Compressed air can blow dust into the eyes. Wear eye protection. Do not exceed 30 psi
(207 kPa) air pressure.
a. Using drycleaning solvent, clean pump case (17) and adapter (5). Air dry parts.
b. Using wire brush, clean rust and corrosion from pump case and adapter
c. Using mild soap solution, wash pump case internally, impeller (10), and retaining assembly.