CENTRIFUGAL PUMP (BACKWASH PUMP) REPAIR - continued.
Positioning of carbon disk is critical.
Position carbon disk (12) on sleeve (11), flat side pointing toward motor when installed, and install sleeve
(11), spring (10) and washer (9) in cover (13).
Position key (8) on impeller (7). Slip impeller (7) on shaft of motor (20) and install seal washer (6) and
impeller screw (5) hand tight.
Lay pump flat on a wooden block as in disassembly and tighten impeller screw (5), applying downward
pressure on pump to keep impeller from turning.
Wear ring must be installed in exact alinement with seat in case. If
incorrectly alined, pump case may be damaged.
Position wear ring (4) in pump case (2). Using arbor press, press wear ring into pump case.
Install pump case gasket (3) on case (2).
Position pump case (2) on adapter (17) and install four long and four short screws (1) as marked at