Bio-Rad BioLogic DuoFlow Pathfinder 80 System HR Gradient Pump Maintenance Kit - Manual

GRADIENT PUMP MAINTENANCE KIT
FOR THE BIOLOGIC SYSTEM
CATALOG NUMBER 750-0164
The BioLogic System Gradient Pump require minimal maintenance to stay in good working condition.
This maintenance kit includes the piston seals, check valves, and piston wipers for routine mainte-
nance of the pump heads.
1. Replacing a piston seal. (Refer to Figure 1.)
a.
Disconnect all tubing from the pump head.
b. Using the supplied Allen wrench, remove the four Pump Head Module Assembly screws on
the
face of the Pump Head Module in the order shown. Gently pull the pump head away
from the Workstation.
Figure 1. BioLogic Workstation Gradient Pump Mechanism Parts
c. Remove the washout block from the back of the pump head module by gently pulling it away.
d. Note that there are two piston seals per pumphead. Always replace both seals at the same
time. Once a piston seal is removed from its gland, it cannot be reused. It is recommended to
pre-condition the new seals by soaking or sonicating them in water for several minutes.
Always shake off or blot excess moisture from the seals before installation.
e. Using the Piston Seal Removal Tool, pry the seal from the gland. To do this, you insert the tip
of the Seal Removal Tool into the seal and gently pry the seal away. (See Figure 2.)
f. To install a new seal, line it up with the gland and use the Washout Block to seat the seal.
g. When both seals have been replaced, reassemble the pump head by reversing the
sequence shown in Figure 1. Firstly, wipe the pistons with a dampened cloth to ensure that
no crystallized salt residues are present which could damage the new seals. Then, position
PUMP HEAD
MODULE
1
4
3
2
PUMP HEAD
MODULE
ASSEMBLY
SCREWS
WASHOUT
BLOCK
SPRING RETAINER
PISTON WIPER
Bio-Rad Laboratories, 2000 Alfred Nobel, Hercules CA 94547 • Phone (510) 741-1000