Figure 19, Components of the pump head, Ng column by a column of a diffe – Metrohm 861 Advanced Compact IC User Manual

Page 83

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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

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