Thermo Scientific Vanquish VH-P10-A-02, Operating Manual

Page: 139 / 238

7 • Maintenance and Service
Vanquish Pumps (VH-P10-A-02) Operating Manual Page 139
8. Hold the pump head with one hand, remove the pump head screw,
and then remove the pump head by pulling it toward you.
The pistons are usually removed from the pump together with the
pump head.
TIP
If a piston remained in the pump, write down the installation
position in the pump head (right or left) and pull the piston out. If
both pistons remained in the pump, be careful not to interchange
them.
Follow these steps to install the pump head
1. Observe the following:
♦ Reinstallation of pump heads
♦ Be sure not to interchange the pump heads. To identify the
correct installation position, note the labeling on the
pressure sensor cable ( L for the left pump head or R for the
right pump head).
♦
If the pistons remained in the pump head, consider verifying
that the distance between the pistons and seal wash plate is
correct (see the related steps in section 7.7.3, page 142 ).
♦
If you have to reinstall the pistons, follow the steps in
section 7.7.3, page 142 .
♦
Installation of new pump heads (replacement pump heads)
♦
To protect the pistons during shipment, the spacing tool is
installed between the seal wash plate and the pistons.
Remove the spacing tool. Be careful not to pull out the
pistons any further.
Figure 42: Removing the spacing tool