Metrohm 940 Professional IC Vario ONE/SeS/PP - Manual (Page 87)

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5 Operation and maintenance
940 Professional IC Vario ONE/SeS/PP (2.940.1500)
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Figure 19 Tool for piston seal (6.2617.010)
1 Tip 2 Sleeve
Spare part For this step you need a new piston seal (6.2741.020).
Replacing the piston seal
Figure 20 Removing the piston cartridge from the pump head
1 Piston cartridge 2 Backup ring
1 Removing the piston cartridge
Loosen the piston cartridge (18-9) using the adjustable wrench and
then unscrew it from the pump head by hand. Place it off to the side.
2 Removing the backup ring
Shake the backup ring (18-4) out of the piston opening. Place it off
to the side.