P 2.1L user manual V6840, version
3.
5
34
Maintenance and Care
Screw Fittings on the Pump Head
Dismounting the Pump Head
Prerequisite
The pump head has been purged.
The tubes and hoses have been removed.
Tools
Allen wrench
Open-end wrench, sizes 10, 17
Chemical burns
Aggressive or toxic solvent residue can irritate the skin.
Wear protective gloves.
Flush the pump head before exchanging it.
Component defect
Damage to the pistons if they tilt.
Undo or tighten diagonally opposite screws evenly by one turn each at a
time.
Intermediate result
The pump head is dismounted. To mount the pump head, proceed the
steps in reverse order.
Legend
1
Capillary fitting
2
Allen screws
3
Outlet fittings
4
Inlet fittings
5
Eluent Inlet
Fig. 29
Screw fittings on the pump head
2
3
1
4
5
Procedure
Process
Figure
1. To remove the capillary, loosen
the capillary screw fittings
1
at
the pump head outlet and pres-
sure sensor inlet.
2. Disconnect the hoses of the pis-
ton backflushing
2
from the
flush pump and the pump head.
3. Remove the eluent lines
4
from
the eluent inlets.
4. Unscrew the Allen screws
3
.
5. Hold the pump head by hand,
and consecutively pull out all
Allen screws.
6. Lift off the pump head.
Fig. 30
Removing the Pump Head
3
4
1
2
