9 • DP/SP Service
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16. Select the Connected check box on the Control panel to reconnect the pump
to the software.
17. Click Motor on the Control panel to start the pump flow.
9.5 Replacing a Piston Seal
A defective piston seal allows leakage past the piston. This may cause unstable
flow rates and baseline noise; in addition, it may make it difficult to prime the
pump.
The piston seal replacement procedure consists of:
• Removing the pump head and piston (see Section 9.5.1)
• Cleaning the piston (see Section 9.5.2)
• Removing the main piston seal (see Section 9.5.3)
• Removing the piston seal wash seal (see Section 9.5.4)
• Installing new seals (see Section 9.5.5)
• Reinstalling the piston and pump head (see Section 9.5.6)
9.5.1 Removing the Pump Head and Piston
1. Click Motor on the pump Control panel in Chromeleon or
Chromeleon Xpress to turn off the pump flow.
2. Begin monitoring the Current Pressure reading on the Control
panel. When the system pressure reaches zero, do the following:
• Disconnect the pump from the software by clearing the
Connected check box on the Control panel.
• Press the POWER button on the front of the DP/SP for 2 seconds
to turn off the pump.
3. Open the DP/SP door to access the mechanical components.
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