For your '84 300TD (123.193) the FSM is located on disc 2 of the attached link:
https://www.startekinfo.com/StarTek/outside/12265/?requestedDocId=12265

Adjusting the throttle linkage is FSM job # 30-300.
Unfortunately the pictures are a bit grainy.

Hope this helps

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