Dismantling the backrest unit:
• Remove the backrest cushion.
• Loosen the hand wheels (4).
• Remove the backrest tube (1) from the backrest mounting bracket (2).
• Loosen and remove the screws (3), including the sleeve and washers, with a Torx Bit TX40
wrench on the left and right side of the chair.
• Remove the backrest mounting bracket (2).
Refitting the backrest unit:
• Replace the parts in the reverse order.
• To conclude, you should always carry out a trial run to test the vehicle functions.