721919 Removing and installing front backrest frame
WM 721919 Removing and installing front backrest frame
Technical values
Information
Installation position of front backrest frame
Installation position of front backrest frame
Preliminary work
1. Remove front seat.
-> 720119 Removing and installing front seat 720119 Removing and Installing Front Seat
2. Remove cover for backrest.
-> 722619 Removing and installing cover for backrest 722619 Removing and installing cover for backrest
Removing front backrest frame
1. Loosen the two restraining straps on the rear part of the seat -arrows-.
Loosening restraining straps
2. Remove the cover on the lower part of the backrest frame using a plastic wedge -arrows-.
Removing cover (shown here on seat lying on its side)
Information
- Make sure that the wire harness is not trapped or damaged during removal.
Information
- The number of connectors and tie-wraps can vary, depending on seat equipment.
- Plug in or out all connectors going to the backrest.
- Cut and replace all tie-wraps used to secure the wire harness to the backrest.
3. Cut tie-wraps on wire harness and disconnect connectors.
3.1. Cut the two tie-wraps -1- and -2- in front of the plug connections using side cutters.
Cutting tie-wraps in front of plug connections
3.2. Cut the tie wrap -1- behind the plug connections using side cutters.
Cutting tie-wrap behind plug connections
3.3. Unplug plug connections under the seat frame -1 to 5-.
Unplugging connectors
3.4. Cut the tie-wrap -1- on the control unit connector using side cutters.
Cutting tie-wrap on control unit
3.5. Lift the locking mechanism -1- on the connector -2- on the control unit using a screwdriver -A- and release it using the locking lug -3- ( -B- ).
Disconnecting connector on control unit
3.6. Remove the split cable conduit -1- and expose the wire harness -2- as far as the cable sheathing.
Removing wire harness for belt lock from cable conduit
3.7. Unwrap cable sheathing -1-.
Removing cable sheathing
3.8. Remove tie-wrap -2- on the connector socket -1-.
Disconnecting connector socket
3.9. Release the two single connectors -3- ( -A- ) and remove them from the connector socket -1- ( -B- ).
Information
- Two persons are needed to remove and install the backrest frame.
4. Unscrew fastening screws -1- and lift the backrest frame -2- up slightly -arrow-.
Removing fastening screws
5. Secure the backrest in an upright position and press the seat cushion in at the outside -A-.
Guiding out wire harnesses
6. Guide the wire harnesses up -B- out of the seat frame.
7. Remove backrest frame and wire harnesses.
Installing front backrest frame
WARNING
Incorrect handling of safety bolts
- Danger of injury
- Loss of torque
-> Always use new fastening screws and nuts following removal.
-> Observe specified tightening torques.
-> Carry out a visual inspection of all re-used parts.
Information
- Two persons are needed to remove and install the backrest frame.
1. Engage the backrest at the inside in order to install the wire harnesses -arrows- and secure it so that the backrest cannot tip forward or back.
Engaging backrest
2. Hold the backrest upright and press the outer side of the seat cushion inwards -A-. Then guide in the wire harnesses in a downward direction -B-.
Guiding in wire harnesses
3. Guide the backrest frame -2- in fully -arrow- , screw in the two fastening screws -1- and tighten to the specified tightening torque. => Tightening torque: 35 Nm (26 ftlb.)+/-4 Nm (+/-3 ftlb.)
Fitting fastening screws
Information
- The number of connectors and tie-wraps can vary, depending on seat equipment.
- Plug in or out all connectors going to the backrest.
- Cut and replace all tie-wraps used to secure the wire harness to the backrest.
4. Plug in all connectors on the underside of the seat and route and secure the wire harness.
5. Fit cover on the lower part of the backrest frame using a plastic wedge -arrows-.
Fitting backrest cover
6. Engage the two restraining straps on the rear part of the seat -arrows-.
Engaging restraining straps
Subsequent work
1. Install cover for backrest.
-> 722619 Removing and installing cover for backrest 722619 Removing and installing cover for backrest
2. Install front seat.
-> 720119 Removing and installing front seat 720119 Removing and Installing Front Seat