Maintaining the 1525 Pump
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4
6.
Hold the check valve housing with the 1/2-inch adjustable wrench. Reinstall the inlet
tubing assembly. While tightening the compression screw, hold the housing to
prevent it from turning.
7.
Repeat steps 2 through 6 to replace the other inlet check valves as necessary.
8.
Prime the pump as described in
. Check for leaks.
Replacing the Outlet Check Valve
1.
Purge the pump with methanol. If methanol is not miscible with your current eluent,
use an intermediate eluent.
2.
Run the pump until the indicator rod fully retracts into the pump head, then click the
Stop Flow
button to turn off the pump. This ensures that the weight of the pump
head does not rest on the plunger when you remove the pump head.
3.
Use the 1/2-inch adjustable wrench to hold the housings in place. Use the 5/16-inch
open-end wrench to loosen the compression screws and remove the inlet and outlet
tubing assemblies from the check valve housings.
4.
Use the 1/2-inch adjustable wrench to loosen the outlet check valve housing.
5.
While holding the pump head securely against the pump, use the 5/32-inch Allen
wrench to remove the two pump head assembly mounting screws. Loosen the
screws 1/2-turn at a time for the first two turns.
6.
Carefully slide the pump head assembly off the pump. (See the instructions on
7.
Hold the pump head upside-down in one hand with the outlet check valve housing
facing the floor, then remove the housing. Remove the cartridge from the housing
and replace it with the new cartridge.
Note:
To help keep the cartridge seated within the housing, moisten it with methanol
during installation.
STOP
Attention:
Before starting this procedure, move the eluent reservoir below the pump
head level. This eliminates gravity flow of the eluent.
STOP
Attention:
Pull the pump head off straight to avoid breaking the plunger.
STOP
Attention:
The arrow printed on the check valve cartridge indicates the
direction in which it will allow liquid to flow. Therefore, its direction is critical
for proper operation. For all check valve assemblies, the arrow should point
upward when installed on the pump.
Summary of Contents for 1525EF
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