8.9 Drive wheels ............................................................................................................................. 70
8.9.1 Replacing the drive wheel ............................................................................................. 70
8.9.2 Replacing a tyre or inner tube ....................................................................................... 71
8.9.2.1 Replacing puncture-protected tyres ......................................................................... 71
8.9.2.2 Replacing puncture-proof tyres ................................................................................ 73
8.9.3 Replacing the drive wheel hub ...................................................................................... 74
8.10 Drive unit .................................................................................................................................. 75
8.10.1 Replacing the motor/transmission unit .......................................................................... 75
8.10.2 Replacing or rotating the motor / gearbox unit sealing ring .......................................... 77
8.10.3 Replacing the motor / gearbox coupling ....................................................................... 78
8.10.4 Replacing the carbon brushes ...................................................................................... 80
8.11 Replacing the rubber shock absorbers ................................................................................. 82
8.12 Replacing the tube frame ........................................................................................................ 84
8.13 Replacing the double bearing of the Dual Swing Technology (D.S.T.) .............................. 86
8.14 Replacing the battery boxes ................................................................................................... 88
8.15 Seat system .............................................................................................................................. 89
8.15.1 Replacing the tilt actuator ............................................................................................. 89
8.15.2 Replacing the tilt module ............................................................................................... 91
8.15.3 Replacing the lifter / tilt module ..................................................................................... 93
8.16 Backrest unit ............................................................................................................................ 97
8.16.1 Replacing the standard backrest .................................................................................. 97
8.16.2 Replacing a standard backrest with quick release ........................................................ 99
8.16.3 Replacing a Flex2 backrest ........................................................................................ 100
8.16.4 Adjusting backrest former ........................................................................................... 101
8.17 Seat system Modulite ............................................................................................................ 102
8.17.1 Replacing the tilt actuator ........................................................................................... 102
8.17.2 Replacing the lifter actuator ........................................................................................ 103
8.17.3 Replacing the lifter / seat angle adjustment module ................................................... 104
8.17.4 Replacing the backrest actuator ................................................................................. 107
8.18 Backrest Modulite .................................................................................................................. 108
8.18.1 Replacing the standard backrest ................................................................................ 108
8.18.2 Replacing the backrest mounting bracket .................................................................. 109
8.18.3 Replacing the backrest mounting bracket for SB 53 .................................................. 110
8.19 Adjusting the seat width/ backrest width (Modulite) ......................................................... 111
8.19.1 Adjusting the seat width .............................................................................................. 111
8.19.2 Adjusting the backrest width ....................................................................................... 113
8.19.3 Adjusting the Flex3 backrest ....................................................................................... 115