ABB A238-H Series, Оригинальная инструкция по сборке

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Assembly Instructions / A200-H
4 Installing the turbocharger / 4.5 Fastening the turbocharger with a
standard nut
© Copyright 2021 ABB. All rights reserved. HZTL455311P0042_EN Rev.A September 2021
Loosening the clamping nut
It is imperative to proceed as follows if the clamping nut has to be loosened again:
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.
Fig. 12: Loosening the clamping nut
u
Working in a circle, break loose all pressure screws of the clamping nut.
u
Working in a circle, loosen each of the pressure screws by about ¼ of a turn (90°).
u
Repeat the previous step until all pressure screws are relieved of pressure.
u Loosen clamping nut by hand.
4.5 Fastening the turbocharger with a standard nut
u
Fit the nuts and tighten them according to variant 1 or 2 in the table below.
Product Through hole in
bearing casing
[mm]
Fixing screws
[mm]
Variant 1: Tightening
torques [Nm] **)
Variant 2: Hy-
draulic pre-ten-
sioning forces [kN]
A238-H Ø 21 M20 560 175
A240-H Ø 25 M24 900 235
Table 10: Tightening torque for standard nuts
**) When the turbocharger is mounted on the engine support, the bolt threads and screw
heads must be lightly oiled (assumed friction coefficient
µ = 0.12 for tightening torque)
u
Remove the lifting gear.
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