Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual page 197

9. Hold the pump head with one hand in its position, remove the pump head screw, and
then remove the pump head toward you.
NC pump
The plate of the rear seal wash system and the pistons remain in the pump. If you want to
clean or replace the pistons, remove the plate and pistons as described for the loading
pump further down in this section. You need not remove the plate and pistons if you want
to replace only the main piston seals.
Loading pump
The pistons are removed from the pump together with the pump head. Hold down the
plate of the rear seal wash system on the pump head and remove the pistons from the
head.
If the plate of the rear seal wash system remains in the pump when you remove the pump
head, set the pump head tool to the plate (→ Fig. 67). The pump head tool is provided in
the accessories kit of the module. Carefully remove the plate from the pump block.
Remove the pistons from the pump if needed.
Pump block tool hooked in
between plate and pump
Plate of the rear
seal wash system
Operating Instructions
block
Fig. 67: Pump head tool, hooked in
UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Pump block
Page 189