Waters 1500-Series, Operator'S Manual

Page: 132 / 188

5-24 Maintaining the HPLC Pump
5. Use the 5/16-inch open-end wrench to disconnect the two stainless steel
compression screws from the inlet manifold. (These screws connect the
inlet manifold to the inlet check valves.)
6. Use the 7/64-inch Allen wrench to remove the two Allen screws that hold
the draw-off valve assembly and bracket to the pump. Carefully remove
the assembly.
7. Remove the two Phillips screws that hold the draw-off valve to the
bracket.
Installing a draw-off valve
To install the draw-off valve:
1. Attach the new draw-off valve to the bracket using the two Phillips
screws.
Tip:
Ensure the new valve is oriented on the bracket as shown in the
figure above.
2. Reposition the draw-off valve/inlet manifold assembly onto the pump,
being careful not to pinch the stainless tubing behind the bracket.
When correctly positioned, the stainless tubing extends through the
cutouts on the sides of the bracket.
3. Secure the bracket to the pump with the two Allen screws.
4. Reconnect the inlet tubing to the inlet manifold.
5. Reconnect the outlet tubing to the new draw-off valve.
6. Reposition the eluent reservoir, and then prime the pump (see
Chapter 4 ). Check for leaks.