VAT 61228-KAGG-0002 - Page 64

MAINTENANCE
Series 612
64/83
Edition 2013-04-12
601894EA
Description
Required tool
5.
Unfasten alternately the 2 mounting screws little by
little.
Allen Wrench
3mm
If only one screw is fasten / unfasten, the
mechanical unit will be damaged. Max.
difference should be less than 1 turn or 0.5
turn of the screws.
6. Remove mechanical unit and clean shaft.
7. Remove o-rings.
8. Clean shaft feedthrough and valve body.
9. Lubricate seal contact surface of valve body with a
slight film of vacuum grease (0.025 ml).
10. Lubricate each o-ring with a slight film of vacuum
grease (0.0125 ml).