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7.18 Backrest unit
7.18.1 Replacing the standard backrest
Requirements:
• 5 mm Allen key
• open-ended spanner, 10 mm
Dismantling the backrest unit:
• Remove the backrest cushion.
• Undo and remove the handwheels (3).
• Use two 13 mm socket spanners to undo the bolts (4) including the nuts and washers on the
left-hand and right-hand side of the chair.
• Remove the backrest tube (1) from the backrest holders (2).
• If the backrest holders also need to be replaced: Undo and remove the Allen screws (5)
including the nuts and washers on the left-hand and right-hand side of the chair. To do this, use
a 5 mm Allen key and a 10 mm socket spanner.
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