Maintaining 600E Pump Components 71
Installing the Inlet Check Valve
If there is no improvement, replace the check valve as follows:
1. Position the inlet check valve housing so you are looking down into it and can see
the guide seal.
2. Place the seat in the housing with the shiny side of the seat facing up.
3. Drop the ball into the seat.
4. Place the guide over the ball.
5. Place the retainer over the guide.
6. The housing seal often remains inside the pump head when the housing assembly is
removed. If the housing seal came out when you removed the housing assembly,
place it back into the pump-head cavity.
7. Holding the inlet check valve housing assembly right side up, screw the assembly
into the pump head, being careful not to tip the housing.
8. Hand tighten the assembly.
Removing the Outlet Check Valve
1. Flush the pump with methanol.
2. Remove the eluent lines from the reservoirs.
3. Turn the inlet manifold knob to the Draw position. Using the priming syringe, draw
all of the methanol from the eluent lines (see Figure 4-1).
4. Remove the ferrule connector from the check valve housing underneath the pump
head.
5. Remove the pump head as described in Section 4.2.3, Removing the Pump Head.
6. Remove the ferrule connector from the outlet check valve on top of the pump head.
7. Remove the pump head as described in Section 4.2.3, Removing the Pump Head.
8. With the pump head upside-down, use a 1/2-inch wrench to remove the outlet check
valve assembly (Figure 4-12). Disassemble the check valve by tipping the housing
upside down.
9. Check the retainer and ball and seal (Figure 4-13) for damage or debris. The housing
seal, which may be difficult to remove, does not normally require replacement.
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