1290 Infinity II High-Speed Pumps User Manual 191
8Maintenance
Install the Pump Head Assembly (G7120A)
Install the Pump Head Assembly (G7120A)
Tools required p/n Description
G7120-68708 HPLC System Tool Kit-Infinity-II
5067-5688 Torque wrench 1 – 25 Nm with 14 mm wrench
G4220-20013 4 mm hex bit
G4220-20015 Adapter ¼ in square to hex
1 Bring the pump drive to the maintenance position using
the Lab Advisor user interface: Go to Service &
Diagnostics > Remove/Install Pump Head and follow
instructions given on the screen. Both pump drives
must be retracted.
Damage to the pump head
Using a wrong torque will damage the pump head.
 For handling the torque wrench, setting and applying
the right torque, consult the manual of your torque
wrench.
2 Install the pump head assembly by tightening the
screws step by step to approx. 5 Nm.