5•Service
Doc. 031851-05 12/04 5-17
5.8 Replacing the Waste Valve O-Ring
A damaged O-ring causes leakage around the base of the waste valve knob.
1. Turn off the pump from the ICS-90 Control panel in Chromeleon.
2. Open the front door of the ICS-90.
3. Turn off the gas pressure to the eluent reservoir.
4. Remove the valve from the pump head housing by turning the knob
counterclockwise until it comes loose from the housing (see Figure 5-8
).
5. Remove the O-ring.
6. Carefully slide a new O-ring (P/N 035776) over the end of the valve and push
it into the groove.
7. Reinstall the valve in the pump head housing, turning the knob clockwise
until the valve is firmly seated. Do not overtighten the valve knob.
8. Turn on the gas pressure to the eluent reservoir.
9. Close the ICS-90 front door.
10. Prime the pump (see Section B.13
).
NOTE If the pump head leaks after replacing the waste valve
O-ring, the valve knob may not have been seated firmly
enough. Tighten the knob further, but only by hand.
Never use a tool.
Figure 5-8. Pump Head Assembly
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