I was looking at the pdf and found this caution (see pic). The Bolt that retains the Timiner Gear is Left Hand threaded.

Item 7 also has a Pin needs to be removed and a Black Arrow in the diagram points to the pin.

a cross from step number 10 is a Pic that shows a tool with a number 25 on it. That Tool is used to rotate the Camshaft of the Fuel Injection Pump when the Fuel Injection Pump is out of the Engine. You could do the same thing with some Channel Lock Pliers if you tape the Jaws with Duct Tape so it does not damager the Shaft you will grip.

You would be rotating the Camshaft of the Fuel Injection Pump after you installed the Timing Locking Pin correctly. As you rotate the Fuel injection Pump Camshaft in the direction of normal rotation it will eventually push out the Plunger of the timing locking Pin and lock the IP Camshaft in place.
At that point you are ready to re-install the Fuel Injection Pump. (If you followed the directions in the pdf your Crankshaft was already previousl lined up on 15 degrees after top dead center of the compression stroke.)

For this sort of work the negative Battery Cable should have been disconnected from the Battery so there is no accidental cranking of the Engine. If you are using the Fuel Injection Timing Pin it is also a good idea to put a Sign on your Steering wheel so you are sure to remove it before cranking the Engine.

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84 300D, 82 Volvo 244Gl Diesel