Mack85LS

Alright so after inspection here is what I found: I believe one one side it says "Wagner Lockheed (9A?)" and on the other side "Made in U.S.A (AFE 800?). This is all I found on this part, and for you here is what inside parts look like. Surprisingly the gum seals are in marvelous shape: Now it's time for hydrovac. Here are the letters/numbers i could find on this: And inside of the hydrovac: And that is all for now. I believe I found video explaining what this whole system does on YouTube called: Hydrovac Brake System uploaded by Daniel Lautenschlager.

No worries, I didn’t thread the bolt directly into the piston. Since the piston is in decent shape, I wanted to avoid causing any additional damage. I only needed to twist it slightly to loosen the rust so I could push it out with grease. The only visible letters/numbers are "Wagner Lockheed." I’ll double-check for any other markings tomorrow after cleaning off the external dirt for a closer inspection.

Well, today I managed to take out those two components to check if they are still usable. I must admit, you were right: There are traces of oil inside, so they are indeed hydraulic with vacuum assist. However, there’s a piston (shaped like a cone) inside, which had gotten completely stuck for ages: Since I’m Polish, this was no match for my 23-year-old hands, and voilà (don’t ask how I managed to do it...): Here’s how the piston looks and a glimpse of the engineering inside: So, yeah, it’s time to use a sandblaster for the external parts. I’ve already blasted one piece, so here’s a sneak peek of how beautiful it looks under all that rust: Have a nice rest of the day!

It’s been a while since my last update, so I want to start by thanking everyone who took the time to share their thoughts and advice regarding my issues. I hope this discussion has been engaging for you and I wish to repay you (sooner than later) with final presentation of restoration. Special thanks to brighter minds than me (@mowerman ; @70mackMB; @cruiseliner64; @steve s.; @tjc transport and @Joseph Cummings) for pointing out the 1st part which is RPM governor. Huge thanks for that! Now, onto the second part, which turned out to be far trickier than I anticipated. I spent two hours searching for a component that looked like an air compressor for the brakes, only to discover(after 2 mental breakdowns and three coffee brakes) that there is none… Turns out, the brakes are vacuum-operated. I believe that’s the case here (correct me if I’m wrong), and I came across a related post that supported this conclusion. For my defence, the part in the photo (highlighted in blue) appears to be a vacuum cylinder connected to the rear tires. For this revelation, I owe thanks to @Geoff Weeks, you nailed it. I hope this post will save someone in the future from the same two-hour rabbit hole I went down. Once again, I appreciate everyone’s help and can’t wait to share with you future progress! (P.S since I want everyone to be listened so: @steve s. This old baby came to us From Germany( probably someone bought it earlier and left it to rot in peace… that’s a no-no) and I’m located right in the middle of the Poland; @yarnall well this Mack was listed to be built in 1953 but you might be right… the chassis number is 1057)

Good morning! I've recently acquired an antique Mack truck—a 1953 Mack 85LS (as shown below). Since it’s an old truck that sat idle for quite a long time, it’s not in its glorious state. However, I’m confident that with my skills, I’ll be able to restore it to its former glory. I would love to give it a fresh paint job and a new lease on life so that it turns heads and makes people want to take a ride. However, I’m not very familiar with antique trucks, and since I live outside the United States, I don’t know much about the original equipment used for this model. I’ve already started disassembling my "patient" part by part, carefully documenting each component’s purpose and where it belongs. However, I’ve come across two parts that I absolutely cannot identify, and I need help figuring out what they are or where I should look for guidance. For starters, this is how future beauty looks right now: I know it ain't much, but it’s honest work! So far, I’ve identified all the parts except these two, and I’ve also determined that the engine is a Thermodyne 707A gas motor. Interestingly, despite only 8,000 miles driven, the oil looks like someone just filled it with fresh oil. Now, after this long introduction, here’s the first part I can’t identify. It’s located on the right side of the engine, as shown below: Hold on I will give you a better view: I really don’t want to damage this part since it still has its original seals, and I’m worried it might be something important. Unfortunately, I haven’t been able to figure out what it is or what it does, which is why I’m seeking help or guidance. The second part I’m clueless about is located behind the water pump system, near the left rear tire: And the only thing visible is this number: So far, I’m relieved that these parts are the only things stopping me from making further progress on the restoration. I am able to provide an additional information about this truck if it's needed for you to help me. If you’re still reading this and I haven’t bored you to death, thank you! I’d be incredibly grateful for any help you can provide with these issues. If you don’t recognize these parts either, any guidance—such as where to look for information, any available manuals for the engine or truck, or recommendations for who to contact—would mean a lot to me. It would help me bring this truck back to life and make it the only fully restored and working model of its kind in the country where I live. Thank you in advance, and I wish you a wonderful day! (P.S. If anyone is interested, I’ll keep you updated on the progress)