Wedging a small screwdriver tip into the slot at the base of the connector can let you pry out each plug without it breaking. (Fig. 11)

The seat base adjustment assembly should now be free.

If your donor seat has orthopedic controls attached to the seatbelt receiver, simply lift it up to detach it from the seat belt receiver.
[I did not realize this on the first donor seat and ended up unplugging the colored vacuum tubing from each vacuum connector and labeling the black connectors with tape (Fig. 15)]

Also withdraw the lower gray vacuum supply hard line that is in the spring box area.

Next, unclip the seatbelt warning buzzer harness where it is attached by two or three clips to the bottom of the spring box and withdraw the harness.

The backrest is attached to the seat cushion base with four 13 mm bolts that thread into the bottom of the seat hinges.
One of the four bolts is specialized for attaching the seatbelt receiver bracket to the spring box.

The seatbelt receiver is attached to the specialized mounting bolt with a spring clip retainer. (Fig.12)

With a large screwdriver, push the retaining clip back to remove it (Fig. 13) and then you can lift and thus remove the seatbelt receiver bracket from the specialized bolt. (Fig. 14)

Remove the seatbelt receiver bracket from the bolt.
After this is done you will have completely removed the seatbelt receiver assembly. (Fig. 15)

Attached Thumbnails

         

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022