Loosen the fixing and clamping bolts of the servo pump and press the pump against the motor. This weakens the V-belt, see also fig. K-1006 in the section "Removal and installation of the engine".
Remove V-belt.
Place the V-belt on the pulleys.
Press the servo pump away from the engine and thereby tighten the belt a little. Check that the V-belt is properly seated on the pulleys and then adjust the tension. Required value: 6.0 + 9.0 mm.
Tighten clamping and fixing bolts to 50 Nm.
Check the belt tension again and adjust if necessary.