Agilent Technologies 1100 Series Reference Manual page 146

10 Replace the MCGV cover and connect the
connection tube to the middle position of the
MCGV (see "Exchanging the Multi-Channel
Gradient Valve (MCGV)" on page 123).
Cover
Repairing the Pump
Exchanging the Pump Drive
146
11 Replace the pump on stack, reconnect all
tubings and cables.