7. LOCK Test Valve:
a. Detach nut (1).
b. Detach lever (2) and turn it 180° degrees.
c. Attach lever (2) to the valve unit ADD and fix it with the nut (1).
8. Switch – on compressed air supply.
9. Carefully release belt and let pantograph raise.
10. Detach belt when pantograph is fully raised.
11. Raise and lower pantograph for checkup.
Illustration 26: LOCK test valve
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