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

Page: 142 / 238

7 • Maintenance and Service
Page 142 Vanquish Pumps (VH-P10-A-02) Operating Manual
7.7.3 Replacing the Pistons
When
Damage of piston
Parts and additional items required
•
Pistons
• Isopropanol
Preparations
Remove the pump head (see section 7.7.2, page 138 ).
Follow these steps
1. Remove the pistons from the pump head (or pump if necessary).
2. Observe the following:
♦
Write down the 3-digit piston calibration value (which is
imprinted on the rear of the piston, see picture) and the
installation position in the pump head (left or right). You might
need this assignment in a later step.
Figure 43: Piston calibration value
♦ Reinstallation of pistons
Be sure not to interchange the pistons.
♦
Installation of new pistons (replacement pistons)
New pistons can be installed in either position.
3.
When reinstalling a piston you removed
Clean the piston. Follow the steps in section 7.7.4, page 145 .
4. To facilitate piston installation, inject a few drops of isopropanol into
the piston cavity in which you want to install the piston.