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| Before commencing any repairs to the gearbox, the cause of the fault must be determined as accurately as possible using the central diagnosis -VAS 5051B- orcentral diagnosis -VAS 5052- in the operative modes “Guided fault location”, “Vehicle self-diagnosis” and “Measurement module”. |
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| If the oil sump has been removed or if gear oil is needed, do not start the engine or tow the vehicle. |
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| If the gearbox is replaced, check oil level → Chapter and top up if necessary. Filling amounts and oil type specifications → Chapter. |
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| Thoroughly clean unions and adjacent areas before removing. |
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| When assembling check that fitting sleeves are correctly positioned. |
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| O-rings, flanges and gaskets should always be replaced. |
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| After removing gaskets, check the contact surfaces of the casing and shaft for feathering or damage caused by the removal process. |
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| Always replace paper gaskets, completely disposing of the used gasket and thorougly cleaning the contact surfaces. |
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| In order to fit flanges apply gear oil around the outer edge and on the sealing lip. |
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| Coat the O-rings with gear oil or vaseline before fitting to avoid crushing during assembly. |
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| Never use other lubricants in the gear oil area. Otherwise, the working of the hydraulic control of the gearbox may be damaged. |
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| The open side of the flanges should face the liquid to be retained. |
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| After assembly, check the level of the gear oil and top up if necessary: . → Chapter. |
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| Do not overstretch the safety rings; replace if necessary. |
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| Safety rings must be well seated in the groove. |
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| Bolts should be loosened in reverse order to the tightening sequence. |
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| If no tightening sequence is specified, nuts and bolts used to fix covers and casings should be tightened and loosened in stages and in diagonal pairs. |
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| Renew self-locking nuts. |
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| The thread of bolts threaded with a fixing agent should be cleaned using a wire brush. Then, fit the bolts with paste → Parts catalogue. |
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| The torque settings are valid for non-oiled nuts and bolts. |
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