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| Turn seat backrest adjustment wheel-1- until a detent can be seen from the rear -arrow A-. Use a torch if necessary. |
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| Continue to turn the seat backrest adjustment wheel by 120°. |
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| Hook in the assembly tool -3399- and lever it in the direction of -arrow B-. |
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| Removing the seat backrest adjustment wheel. |
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| Installation is carried out in reverse order. |

Note | If the seat backrest adjustment wheel is too loose following assembly, it must be renewed. |
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