GTO inches but won't Run

GTO year 1981,
Stopped press to do registration, when I went to start the press it does not go on Run.
Checked all the safety guards, double sheet detector, crank handle, delivery stop etc, all functioning
properly. Press will inch back and forward.
At the time the press was inked up, so I pulled the motor break and pressed C1 contactor
in order to run machine and clean press.
I have someone coming to take a look at it but it won't be for some time,
Hoping I can get some advice on here for things to look at.
Attached is a pic of the run/paper/water/impression switch box.
Thanks

 

One question can anyone tell me what the D5 contactor's function is?
If the handle is set on run and I manually "push in" D5 the press starts to run.

 

Run button faulty? Try to clean up the contacts plastic safe contact cleaner.

 

Check coil viability on d5, that is forward motion relay.

 

Yes, I suspect the coil is bad since everything functions when you manually push d5 in, I am trying to locate a replacement right now.
I will attach a pic of the part I need.

 

Heidelberg said this is the direct successor, but I don't think it's going
to work, does anyone have a source for this part?

 

Why do you think it won’t work? As long as it is equipped with the correct amount of NO and NC contacts, and the control voltage requirements is correct for your machine, it should be fine.

 

The L1-L3/T1-T3 terminals are NO contacts, along with the #14 contact make this a 4 NO contactor, and the control voltage ( coil wires) are on the front face rather than in the rear. The old version in your machine simply are no longer available, because of this, you MAY need to extend wires.

 

Thanks Junker