GEX2563900-02

Treatment of Firmly Screw-Connected Contact Surfaces

WARNING

hazard of inADEQUATE MAINTENANCE

Careful when handling bars insulated by heat-shrinkable sleeves: the heat-shrinkable sleeve must not get into contact with lubricant (swelling).
Contact areas coated with lubricant KL must not be touched.
Contact areas must be subjected to preliminary treatment before screw fastening (see table below).
Immediately after the preliminary treatment, coat contact surfaces completely with a thin and uniform film of lubricant KL.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

Follow the below steps for treatment of firmly screw-connected contact surfaces:

Contact areas must be subjected to preliminary treatment before screw fastening (Refer Table).
Immediately after the preliminary treatment, coat contact surfaces completely with a thin and uniform film of lubricant KL.

Material of contact surfaces	Pre-treatment
Silver-plated contact surfaces	Clean⁽¹⁾
Nickel-plated contact surfaces	Remove passivation layer⁽⁴⁾
Copper or copper alloy	Clean⁽¹⁾, expose metallic surface⁽²⁾
Aluminium	Clean⁽¹⁾, expose metallic surface⁽²⁾
Steel	Clean⁽¹⁾, expose metallic surface⁽²⁾
Zinc-plated steel	Remove passivation, not the zinc layer⁽³⁾
Hot-galvanized sheet-metal	Clean⁽¹⁾, passivation need not be removed
⁽¹⁾ Clean by means of lint-free cloth; use cleaning agent in case of serious contam-ination (see above) ⁽²⁾ Expose metallic surface - by treating the entire surface with emery cloth or a rotating grinding tool (grain-size 100 or 80) or - using a wire brush which is clearly marked for use exclusively for aluminium or exclusively for copper ⁽³⁾ Using a brass brush, steel brush ⁽⁴⁾ Rub slightly by hand using Scotchbrite abrasive agent (Ni layer must not be reduced)

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