This procedure risks exposure to hazardous, toxic or flammable solvents and reagents. When working with these substances observe safety procedures (for example by wearing protective googles, suitable safety gloves and protective clothing) as described in the material handling and safety data sheet supplied by the chemical vendor, and always follow good laboratory practice.
For best performance and life time and for avoiding leaks. use a torque wrench set to approx. 10 Nm for fixing the inlet valve to the pump head.
1. Close the shut off valves on the pump solvent inlet lines to avoid solvent leaks during this procedure.
2. Unscrew the tubing at the inlet valve.
3. With a 14mm wrench, unscrew the inlet valve and remove it.
4. Install replacement inlet valve in the primary pump head (1) and tighten it (2) to approx. 10 Nm. with a torque wrench (14mm).
5. Attach the inlet tubing at the inlet valve.
6. Open the shut off valve and thoroughly purge the system to remove air.
7. Close any Online sessions connected to the LC system.
8. Open Agilent Lab Advisor, connect to the LC system, and then select "Service and Diagnostics" from the left-hand side navigator.
9. Select the G7120A High Speed pump from the list of available modules, then select and run the Pump Leak Rate Test from the list of pump maintenance tasks.
10. Follow the instructions given in Lab Advisor and select an appropriate test pressure to run the Pump Leak Rate Test. If the test passes the pump should be good to use. If the test fails or aborts without reaching the test pressure, then please contact your local Agilent service representative.
Cause: Over normally use the outlet valve can start to leak or the ball inside the valve can stick causing pressure and flow issues. This is especially true with old or aged Acetonitrile left in the outlet ball valve. Always flush pumps after use.