1961H67

I agree on these old parts,, I put a regulator on my hose and set it at 100 for checking this system,,

Agreed, I’m going to focus on steer axle brakes for now, I have shop air hooked to it so I’m going to check some pressures .

Your correct, I’m sure it would work just fine, I was trying to use as many original parts as possible, but I’m not going to spend a lot of time and money when parts like your talking about are more dependable and available.

That’s the way I’m going to hook it up and try it, I might still have to replace/ repair the relay valve that’s plugged now. I’ll eventually get it back to normal. Thanks again!

Many thanks for all the replies, I’ll hook it up the way We All think it should be and find out what is leaking, and make repairs. OH how I wish that’s all I have to do before finishing it ! I’ve been putting the floor panels in today.

I put both pictures on in order , hopefully my explanation will make sense, That line that loops around to rear of shuttle is from trolley , line going straight in is from treadle in second picture

Ok , I took about a hour yesterday double checking the brake plumbing, Mechohaulic is totally correct! There is a quick release valve inside the left frame rail of this truck and both parts trucks, air goes from treadle to dash limit valve to top of this valve, each bottom port to right & left steering brakes ( so next I will have to hook a gauge up for them being slow) . So the first valve pictured is in the system has something to do with trailer brakes. I’m not sure if the “tee “ in the second picture is factory. Air comes from one delivery port on treadle to shuttle ( or double check valve) on the front side, the delivery from the trolley loops around to back port of shuttle valve. So when brakes are applied or treadle is pulled air comes out center port where the tee is , one line goes to service side of tractor protection, the other goes to left bottom port of the relay/ quick release valve with constant air to top port and right bottom port plugged . ( first valve pictured) . Since the first pictured valve has constant air, maybe it is a relay valve, air coming from delivery port at shuttle ( remove tee) to left bottom port, remove plug and run line to service of TPV ??? Maybe it had this relay valve in the system to give a extra boost of air to trailer service???

Thanks for the guidance, both the parts LJs has some sort of relay valve on the frame going to front brakes, and I couldn’t find a shuttle valve on them either. I’ll double check the plumbing and put a gauge on the front , the copper plumping is 100% original , ( I replaced a few pieces because they had bad rubbed spots) I think there was too many hands involved in the 70s , possibly taking a piece of copper off and plugging something.

I did send 2 different pictures, the first is what we think is a relay valve , the second is a shuttle valve, the line goes from the shuttle valve to the bottom of the relay valve, I’m still thinking a line should be on the right bottom of the relay , just trying to find where the other end would have been. I’m thinking that maybe why the front brakes are very slow applying . Both my parts LJs are 48s and this is a 51 , The LT is a 55 . And they’re all different! I’m not sure when exhaust brakes came out, this one never had on according to the build sheet and the older drivers I talked to that drove it. So if I see a LJ setting at a truck stop I’m crawling under it,,, Yeah that will be the day I’ll play the LOTTERY

I think you’re correct,, I haven’t had time to play with it today, That truck had about a 7 year period from the time the Welding Company traded it in to Peterbilt ( that’s when my friend bought it) until I started driving it ,and I knew some of the guys that worked for him ,,, So there is no telling what they may have bypassed if it had a leak, I always remember the brakes weren’t that good,, but all the old H ‘s and B’s weren’t ether.

I’m not sure, I plugged the bottom line to it and the rear brakes worked normal, no leaks anywhere now, but the front is very slow, all lines under are copper and look original?

It was a factory tractor, both parts trucks have that same dial style front brake valve, put the older LJ (48 I think) doesn’t have a tractor protection valve, it has 2 ball valves that the trailer airlines hook to,, the other LJ has the same tractor protection valve,,, I’m going to get under it and make sure that “Relay “ valve isn’t in a different location ,, I’m now guessing maybe someone put the tee in going to tractor protection and plugged that right port ,, ?? Thanks for advice!

Yea I thought of that also, I traced the lines from foot pedal up to dash to limiting valve ( dail type) back to that check valve where the tee is to this valve. But you may be on the right track, that valve could have been plugged years ago, and just started leaking when I put air to it for the first time in 30 years. I was surprised that the foot valve and had valve were not leaking.

I dug through an old LJT manual this morning,, you’re probably correct, it talks of a relay valve but no picture. I have been the only one working/ using this truck for 45 years, and I never remember taking a line off, ( were the plug is ) the bottom line comes from a check valve that connects to the foot pedal and goes to front brakes , there is a tee off it before it gets to this valve the goes to service side of the tractor protection valve. ( top full air ) Relay valve in that location makes sense,, but it serves no purpose without another line??? I’ll keep looking for a better diagram . Thanks for all the advice! Hopefully someone can rattle my memory.

That is definitely a HEAVY Haul! I would hate to see that haul bill!

I have been hooking up all my air lines, most of the copper was good, replaced some with plastic. I put 110 shop air on the system, I got all the leaks pretty much stopped, remember it’s not been used in 30 years. I have 1 issue,, when I press foot brake or pull hand valve I have a bad leak from the bottom ( exhaust) of this valve on cross member in front of 5th wheel, my 2 parts LJs doesn't have it . The top line comes from the 2nd air tank ( pressure all the time) the other tees off line from foot valve to brakes ( delivery) . I’m not sure what it’s purpose is especially with constant air pressure hooked up. Any suggestions?

A few more “Non-Mack” we use besides the Western Star, they come and go especially dump trucks, The Autocar has made it a year. I’ve had the 81 Peterbilt 359 for 25 years, got it from a friend of mine that ran it to California weekly, it had a 400 Cummins, I got it with no engine, I put a 8v71 Detroit in it , My son put a 3406B in it a few years ago.I just recently repainted it. We sold the 99 379 Peterbilt ( C16 18 speed ) we restored it also. The General, and COE KW ,both had 8V92s . They’re also gone.

A few more old tractors we have collected, over the years. Back when my Dad was living and my Son was a teenager we went to a tractor pull every weekend in the summer, we only go about 2 times a year now, I mainly kept some smaller antique pullers in case my grandson (8) wants to later on .1943 Farmall , the picture is the same tractor, same spot, my son at 6 and my grandson at 7 , 26 years apart. 1938 Oliver , 1952 Ferguson 30 , picture of my Son & Grandson. All these old tractors have lots of memories, We restored all of them, a family hobby.

Yes it’s a repower , it has a quadraplex in it , I have never run the vin to find out what engine it originally had. Probably get interested if I bought it, I’ve been working on him for 5 years to sell it . He says he really doesn’t want to sell it right now,,, and I’ll have to live to 120 to finish what I already have,, so he’s probably doing me a favor.

I Never knew about the 1 cylinder! Thanks for the info! Back in the day they would put Detroits in anything, The fellow that had my LTH was a big Terex fan, his nephew said in the 60s he repowerd every truck he used in Alaska with a Detroit. A friend of mine has a B 81 with a 6-71 in it ( I’m trying to trade him out of it) . This was our “Hot” Super 99 GM pulling tractor, We kept it looking rough, but it was hard to beat.

That looks about the same as what my Dad got for our H Model about 20 years ago, that will look great, I’ll check them out, I also found some at Restoration Specialty, I’ll do some measuring, Thanks again!

Lol , i think that Massey Ferguson transformed into a Detroit page,,, there’s been a lot of good comments and history from it over the weekend.

Just think how versatile that 2 cycle Detroit is , 2, 3 , 4 ,6 , 8 , 12 , 16 cylinder,, heck they may have made more combinations I haven’t heard about, they bolted them together, run backwards in a boat , we have a Taylor forklift with one in it . But like everyone else,, I couldn’t imagine setting on a 98 Massey or an Oliver GM for 8 hours in a hard pull with that exhaust 4 feet away! The 98 has a factory muffler and it’s loud! The 99 Oliver pulling tractor I had was a 5 inch straight, marine injectors, changed the blower gears to spin it faster, it was a beast,, but my goodness it was deafening!

Thanks for the floor mat tips, I’ll call around this week. Had a few hours over the weekend to hook up the exhaust, hopefully I can put the driveshaft in this week and at least pull it out of the shop and run it some .