4-8.1.2 Chemical metering pump diaphragm replacement. When chemical seeps from around head disc (Figure 4-
2), replace pump diaphragm as follows:.
Place pump stroke length knob (Figure 3-5) at 100 percent.
Remove four screws and flatwashers holding dosing head to pump Remove dosing head.
Place pump stroke length knob at zero percent Remove pump diaphragm by turning counterdockwise The
head disc will also fall free.
Install replacement diaphragm by holding head disc in position (drain slot on inside) and turning diaphragm
clockwise onto plunger shaft end Grasp penmeter of diaphragm and hand tighten.
Place pump stroke length knob at 100 percent Rotate head disc until marker hole is up and drain slot is
down. Align four screw holes with motor housing holes.
Install dosing head with arrow oriented up. Secure dosing head with four screws and flatwashers Tighten
4-8.1.3 Chemical metering pump fuse replacement. Replace chemical metering pump fuse (P/N 60-30-110) as
follows (Figure 3-5):.
Open (OFF) switchboard circuit breaker P6 or P7 as appropriate Redtag circuit breaker with the following.
"WARNING - DO NOT ACTIVATE. REPAIRS BEING MADE ".
Press In and turn fuse cover to left to remove Remove cover and fuse. Remove fuse from cover.
Install replacement fuse in cover Install fuse and cover Press in and turn to right.
Close (ON) switchboard circuit breaker P6 or P7 and remove red warning tag.
4-8.1.4 Chemical metering pump tubing and cap replacement.
Avoid exposure to coagulant (Hydrapol-50) and Inhibitor (Hydrapol-100). Wear safety goggles or
faceshield and rubber gloves when working around chemicals. If chemical Is swallowed, do not
induce vomiting. Drink water and seek medical attention. If chemical gets In eyes, flush with
water and seek medical attention. If chemical contacts skin, wash with soap and water.
Cut new tubing the same length as bad tubing being replaced.
Install new tubing.
4-8.1.5 Flow Indicator (F1) replacement.
Do not operate the ROWPU while performing the following procedures.
Loosen two screws securing guard and remove guard.
Loose sealing nut with special wrench (P/N 51884-1) and unscrew flow indicator.
Install replacement flow indicator and tighten sealing nut.
Ensure flow indicator operates satisfactorily and does not leak when ROWPU operates.
Record completion of maintenance in maintenance logbook.