Operation Manual / A170-M.. - A175-M..
3 Removal and installation / 3.2 Removing the turbocharger
© Copyright 2021 ABB. All rights reserved. HZTL4033_EN Rev.H July 2021
3.2.1 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.
u Comply with the following steps for loosening the pressure screws.
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.
u Do not clean pressure screws.
u Do not lubricate pressure screws.
If a screw jams, the previously loosened screw must be tightened again a little.
Fig.14: 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. In 1 to 5 rounds, loosen each pressure screw by 90° in circular order until all pressure
screws have been relieved.
u Unscrew and remove the clamping nut by hand.
Page 31 / 147
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