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10.4 Replacing a Pump Piston Seal and Backup Seal
These instructions apply to the dilution pump and the stepper motor loading pump
(P/N 068561, both pumps).
A damaged seal allows leakage past the piston. The pump may be difficult to
prime and flow rates may be unstable.
Preparation:
1. Rinse the pump flow path with deionized water by turning the waste valve
knob (see
valve and directs the flow to waste.
2. After rinsing, close the waste valve.
3. To prevent contamination of pump parts, put on a pair of powder-free gloves
before disassembling the pump head.
Refer to
Figure 10-4
Waste Valve
(P/N 063968)
To remove the pump head and piston:
1. Turn off the SP power.
2. Disconnect the power cord.
3. Disconnect all tubing connections to the pump head.
4. Using a 7/64-in hex key (P/N 068227), loosen the two screws on the pump
head. Remove the screws and washers.
Doc. 065250-06 03/2020
Figure
10-1) one-half turn counterclockwise. This opens the waste
when disassembling and reassembling the pump head.
Outlet Check
Valve Assembly
(P/N 047661)
Washer (2)
(P/N 045690)
Screw (2)
(P/N 069222)
Seal
(P/N 063382)
Valve Assembly
(P/N 047660)
Figure 10-4. Pump Head
O-Ring
(P/N 014895)
Pump Head
(P/N 069005)
Main Seal
(P/N 069006)
Inlet Check
10 • Service
Spacer with Drain
(P/N 069004)
Backup Washer
(P/N 069007)
Piston
(P/N 066110)
Backup Seal
(P/N 066163)
127
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