Metrohm 861 Advanced Compact IC - Manual (Page 83)

4.2 Maintenance and servicing
861 Advanced Compact IC / Instructions for Use 8.861.1033
73
To prevent the piston 91 suddenly jumping out of the piston cartridge
93 , the screw 90 must be undone very carefully by hand.
3 Cleaning/replacement of piston 91
• Pistons contaminated by abrasive particles or deposits are
cleaned with scouring powder and rinsed free of any particles
with dist. water.
• Relatively badly contaminated or scratched pistons must be
replaced (spare part: 6.2824.070 Zircon piston).
4 Replacement of piston seal 98
• To remove damaged piston seals 98 the special tool 102 is
used. This is screwed into the seal 98, which can then be
pulled out (see Figure 20A).
When the special tool 102 is screwed into the piston seal 98
the latter is completely destroyed!
• To install a new piston seal 98 the special tool 103 is used.
• First the new seal is inserted firmly in the recess of tool 103
by hand (see Figure 20B). The seal spring must be located on
the outside.
• The tool 103 together with the seal is then inserted in the
pump head 40 and the seal pressed into the pump head re-
cess with the aid of tool 102 (see Figure 20C).
Figure 19: Components of the pump head
90 91 92 93 94 95 96 97 98
99
101
100
101 40