SyriXus Series Pumps Installation and Operation Guide
Section 9 Pump Maintenance, Troubleshooting, and Servicing
9-13
EAR99 Technology Subject to Restrictions Contained on the Cover Page
9.10.1 Piston Seal
(Excludes 30D)
Sometimes dirt or other solids on the seal can cause leakage.
Removing and cleaning the seal may stop the leak and a new seal may
not have to be used. However, if you remove and inspect the seal and it
does not have any obvious crease or you did not find any foreign
material on the seal, then the seal must be replaced. Check the wear
ring. Refer to Section 9.11 "Wear Ring Cleaning and Replacement".
NOTE
DO NOT use abrasives while cleaning the piston and piston seal
area. Scratches caused by the use of such abrasives will cause
leaking. If either the cylinder or seal has been scratched, it must be
replaced to maintain flow rate specifications.
NOTE
If your pump uses polyethylene piston seals, be sure to follow Sec-
tion 9.10.2 "Piston Seal Break-In (Aqueous Seals Only)" for this type
of seal.
Accessing the Piston
Seal
1. Unscrew the piston seal retainer (Figure 9-9) from the piston
and remove the seal from it. Notice that the spring embedded in
the seal is facing up or is on the top side of the seal.
2. Clean both the piston seal retainer and the cylinder thoroughly.
Use a clean microfiber cloth when cleaning the piston and cylin-
der parts. Do not touch the seal surfaces with anything metal.
Ultrasonic cleaning in a suitable solvent and air drying is
strongly preferred. Make sure all parts which come in contact
with the seal are free of dirt and other solids.
3. Once the seal and cylinder surfaces have been cleaned, rinse
both parts with isopropyl alcohol.
9.10.2 Piston Seal
Break-In (Aqueous
Seals Only)
The break-in procedure is intended only for the UHMWPE (aqueous)
piston seal to prevent the spring from bowing out of shape.
1. Assemble the piston assembly per Figure 9-9 (1). Be sure to
install the top seal on the piston with the spring facing down.
2. Slide the cylinder over the piston assembly, per Figure 9-9 (2),
and allow it to sit for 15 minutes. This “breaks in” the seal for the
steps that follow.
3. Remove the cylinder.
4. Reassemble the top seal with the spring facing up, per
Figure 9-9 (3).
5. Install the cylinder over the piston assembly again and screw
onto the mounting block.
6. Leak test the pump.