2-70. CHEMICAL METERING PUMP REPLACEMENT/REPAIR (CONT)
Using small punch, press sleeve, valve ball, and two O-rings from discharge and suction valve bodies.
Using clean water, wash parts.
Inspect parts for damage. Replace as required.
c. Dosing Head Assembly
Install O-ring and valve ball in discharge valve body. Press in O-ring and sleeve.
Install O-ring on discharge valve body.
Install valve ball in dosing head. Install O-ring in dosing head. Install discharge valve.
Install O-ring and valve ball in suction valve body. Aline hole in sleeve with hole in body. Press in O-ring and
Install O-ring on suction valve body.
Install valve ball and O-ring in dosing head. Install suction valve.
Install O-ring and bleeder valve in dosing head.
Set pump stroke length knob at 0 percent.
Set pump stroke knob at 100 percent.
Rotate head disc down. Aline four screw holes.
Install dosing head with arrow pointing up. Install four screws and flatwashers.
d. Pump Installation
Install pump on pedestal. Install two flatwashers, mounting screws, and nuts.
Connect wires in electrical enclosure. Remove tags.
Install pump cable in clamps.
Install two tubes on valves on rear of pump. Tighten clamping nuts.
Plug in pretreatment assembly power cable.