drain oil in chain case

[Peterbilt95]

can anyone tell me how to drain the oil in the chain case I don't see a drain plug in My 2011 apex

 

[sideshowBob]

Behind the lower part of the chaincase, inside the tunnel, there is a 12mm head bolt with a copper gasket. Access it on track side of tunnel.
Remove that bolt and the oil will drain.

 

[Peterbilt95]

Thanks very much

 

[Hartatac]

When you remove the plug make sure the rubber seal is still on it. It will still plug the hole when screwed on without the seal but I had one back off before.