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That would be the heavier end of the Loadstar line 1800. Air braked? I think I see an air tank, but could also be for vacuum storage.

I cant even find my notebook where i recorded all the pins on the bus bars on the firewall. That bugs me... my note books go back 25 years...

KP2... I organized my library of shop manuals. Unfortunatley, the only wire diagrams I have are V-Mac 3, and 4, or the Volvo versions after 2007. I wish I could have helped you. Jojo

I don’t think anybody sure if you’re talking about Randy or Santa that prime rib looks amazing. I’ll be right over with a plate and a fork and a long face.

This is the 1967 Loadstar that I drove on the farm. If memory serves me it was a 549, 5 and 3. I loved driving this truck and would have bought it if Jim would have been willing to sell it at the right time.

Still waitin' on the prime rib smoker expert to get back to me...

I wouldn't try to plug off ports. It is designed to balance the force between the two halves. If you are hell bent on using an E 6 in place of an E-3 then parallel the two sides so both feed the single outlet. If you are trying to go the other way, replacing a 6 with a 3, then there is no way and it would be a red-tag at inspection if you did. Just like single vs tandem master cyl on car brakes.

The E3 is readily available to buy. You may be able to plug off some ports on the E6 to make it work, but I'm not familiar enough with it.

That's a fine looking truck, I'd love to have one in that condition today!!

Happy B-day D-Day!

seeing the paint burned off the tube at the bend behind the compressor, make worry about some "coking" in the discharge line. I would remove and clean or replace to be sure of it. I kept a very close eye on my air system and rarely if ever had a problem. I don't think any of my trucks had a relief before the drier, all had them at the drier.

Yep. That was my point about the safety valve. Its good that you found that info..

here it is from the horses mouth (Bendix)

The earlier compressors in the Tru-Flo series, TF500,600, 700 and TF501 I don't think had the provision for a relief the TF 550 I believe does. It is a later compressor. I still have some 500 and 700 models, I'll have to check if I have a 501.

So an update started running Riselone Crystal clean in my def system and so far so good I’ve gone a week so far without a manual regen and or engine light and def consumption has gone down

I have not called him in the last 18 months or so, He was retired and does not operate as a business any longer but he will sell what parts he has left to someone in need I was told to let the phone ring for a while he was hard of hearing

Yeah, Paul pretty much had the same background

P.S. glad it worked for you. disconnecting the line and running at high speed is kind of a "hail Mary" type situation, may work, but sort of last ditch effort before pulling the compressor.

I don't think the TF501 has that. Replace the elbow from the tube with a T fitting and a pipe to flare adapter and put the relief valve there. Also inspect or replace the copper line. If the head had carbon build up good chance the copper line does also. Be sure to use a high temp relief valve as the outlet temp can be quite hot

97 is when V-Mac changed from 2 to 3, coming out in '98. A whole other animal.. i just packed up a bunch of my books during a home repair project. I may try to look for my drawings. I have a bunch.