D-Series Syringe Pumps - Isco
D-Series Syringe Pumps - Isco
D-Series Syringe Pumps - Isco
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D <strong>Series</strong> <strong>Syringe</strong> <strong>Pumps</strong><br />
Section 5 Pump Maintenance & Repair<br />
5.3 Seal Cleaning and<br />
Replacement<br />
Before cleaning or replacing the piston or wiper seals, the cylinder<br />
must first be emptied. To access the cylinder:<br />
1. Run the pump at maximum flow rate until it’s empty.<br />
2. Disconnect the power cord.<br />
3. Disconnect the pump pressure transducer cable from the<br />
controller and remove the tubing from the inlet and outlet<br />
ports.<br />
4. Remove the front cover of the pump.<br />
5. Loosen the four cover screws.<br />
6. Then loosen the cylinder lock screw which is a 1 4-20 setscrew<br />
located in the front side of the cylinder mounting<br />
block.<br />
7. You may now unscrew the cylinder. If you need to use a<br />
wrench, we recommend using a strap wrench or the<br />
wrenches in the Teledyne <strong>Isco</strong> wrench package<br />
(60-1247-067 for 65DM, 100DM, 100DX, and 260D;<br />
68-1247-068 for 500D;<br />
60-1247-093 for 1000D), which will not mar the cylinder’s<br />
outer surface.<br />
8. Once the cylinder has been unscrewed, lift it up and off the<br />
piston and the push tube.<br />
5.3.1 The Piston Seal Sometimes dirt or other solids on the seal can cause leakage.<br />
Removing and cleaning the seal may stop the leak and a new seal<br />
may not have to be used. However, if you remove and inspect the<br />
seal and it does not have any obvious crease or you did not find<br />
any foreign material on the seal, then the seal must be replaced.<br />
Check the wear ring. See Section 5.4.<br />
Note<br />
DO NOT use abrasives while cleaning the piston and piston<br />
seal area. Scratches caused by the use of such abrasives will<br />
cause leaking. If either the cylinder or seal has been<br />
scratched, it must be replaced to maintain flow rate specifications.<br />
Note<br />
If your pump uses polyethylene piston seals, be sure to follow<br />
the special instruction below for this type of seal.<br />
Accessing the Piston Seal<br />
1. Unscrew the piston seal retainer (Figure 5-2) from the piston<br />
and remove the seal from it. Notice that the spring<br />
imbedded in the seal is facing up or is on the top side of the<br />
seal.<br />
2. Clean both the piston seal retainer and the cylinder thoroughly.<br />
Make sure all parts that come into contact with the<br />
seal are free of dirt and other solids.<br />
5-5