Fig. 8: Loosening The Clamping Nut - ABB A155-M57 Operation Manual

Operation Manual / 4 Product description / A150-M56/66/57/67 -
A155-M..
2 Removing and Installing / 2.2 Removing the turbocharger
2.2.1 Loosening the clamping nut
CAUTION
Incorrect procedure can make loosening impossible
If individual pressure screws are fully relieved, the pressure screws can be-
come compressed, making it impossible to loosen them.
Comply with the following steps for loosening the pressure screws.
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CAUTION
Do not clean pressure screws
The pressure screws are equipped with a permanent sliding layer that must
not be removed. In case of non-compliance, it cannot be ensured that the
necessary tension force is reached.
Do not clean pressure screws.
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Do not lubricate pressure screws.
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If a screw jams, the previously loosened screw must be tightened again a little.
Fig. 8: Loosening the clamping nut
1. Working in a circle, break loose each pressure screw (≤ 20°).
2. Working in a circle, loosen each pressure screw by 45° in 4 rounds.
3. Working in a circle, loosen each pressure screw by 90° in 1...5 rounds until all of the pres-
sure screws have been relieved.
Loosen clamping nut by hand.
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© Copyright 2020 ABB. All rights reserved. HZTL4032_EN Rev.P March 2020