Specifications

27
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PUMP MAINTENANCE
Changing the Pump Seals
(All pumps except the
G1361A preparative pump)
1. Disassemble the pump head and use
a piston to remove the two seals.
2. Clean the pump chambers and seal
areas by flushing with solvent and
w
iping with a lint-free cloth.
3. Insert new seals.
4. Reassemble the pump head.
5. Perform the seal wear-in procedure
(Standard seals 5063-6589 only).
The wear-in procedure involves flushing
the seals with isopropanol at high pressure
while they are in place.
Changing and Inspecting the
Sapphire Pistons
(All pumps except the
G1361A preparative pump)
Each time you replace the seals, examine
the pistons for scratches, which can cause
small, but damaging leaks.
1. Disassemble the pump head assembly.
2. Remove any deposits – particularly
buffers – from the piston surface using
alcohol or toothpaste. Replace the
pistons if scratched.
3. Rinse thoroughly in alcohol
and HPLC-grade water
.
4. Reassemble the pump head.
5. Check to make sure there are no
fractures in the springs. Replace
piston housing assembly if springs
are damaged.
6. Reinsert the pistons.
Pump seals should be replaced when there
are leaks on the bottom of the pump head,
when retention times are inconsistent,
o
r when the pressure ripple is unstable.
Description Unit Part No. Price ($)
Sapphire Piston 5063-6586 113
Piston Seals, graphite filled Teflon (reversed phase) 2/pk 5063-6589 84
Piston Seals, polyethylene (normal phase) 2/pk 0905-1420 109
Piston housing assembly (includes springs) G1311-60002 113
Extended PM kit 1100/1050 pumps, Contains 1ea: 5063-6589 piston seal,
01018-22707 PTFE frits (5/pk), 5062-8562 cartridge active inlet valve,
G1311-60012 outlet valve & 2 5063-6586 pistons
5065-4499 714