Maintenance - Leister 142.723 Operating Instructions Manual

Testing
• The other end of the test channel must be airtight, e.g. close off by hot gas welding or with clamping devices.
• Compressed air flow in.
– The manometer (4) must display the calculated compressed air value (bar / psi).
– The overlap weld seam is regarded as tight if the pressure drop during the test time is
not more than 10 % of the calculated initial value.
• After the test time has passed, the air channel sealed airtight at the opposite end is
opened. The air must escape abruptly.
• Remove compressed air tester with test needle.

Maintenance

• Clean test needle (2) and compressed air connection (5) if contaminated.
Replacing the sealing rings and test needle
• Old or brittle sealing rings must be replaced. Sealing rings included in scope of supply.
• Loosen the four screws (6) to remove the guard for the test needle (3) and sealing rings.
Fitting new sealing ring.
Do not touch the top of the test needle (2). This can cause injuries.
• Loosen hexagon screw (8) using hexagon spanner 14 mm. Remove test needle (2) and seal.
Fit new sealing rings and if necessary new test needle (2).
ATTENTION: The entire thread length of the test needle (2) must be screwed in onto the original seal as
far as the limit stop. The hexagon must run parallel to the guard for the test needle (3) (Figure I).
The test needle (2) is thereby secured against coming loose itself.
The compressed air tester with test needle may only be used with the mounted guard for the test needle
included in the scope of supply.
• Sealing ring on compressed air connection (5)
– Remove compressed air at the compressed air connection (5).
– Loosen screw (7) using hexagon spanner.
– Remove sealing ring and compressed air connection (5).
– Fit new sealing ring.
– Mount compressed air connection (5) by tightening the screw (7).
2
Fig. I
4
8
3
9