mechohaulic

error===2 is not supply; 2 is delivery.

forgot the simple part (i'm old).before taking any lines off just work the trolley to see if it was partially pulled.if it wasn't THEN take off the line check for air going through.also if there was another air back feed on the treddle valve the valve SHOULD have an air leak out the bottom (exhaust port ).

might be alot easier to take the feed line off the trolley in cab then lines off brake valve. trolley three lines 1-supply(constant air) 2-supply( air to shuttle valve on brake pedal ). 3 exhaust port (out to fire wall.

if the unit has a trolley valve and truck is in bob=tail mode, the tractor protection valve won't effect brake operation, with the shuttle valve working the slightest pressure on trolley will STILL activate the brake lights but NOT the brakes.

i really like the looks of a clean, neat shop. you built a real mack quicker then it took me to build a 1/25 scale mack. LOL. truck is coming along great. hopefully this virus stuff will lighten up and shows will start again. possibly we can make it from CT to a VT show this summer and see the truck.

i wouldn't go as far as to call it a dumb question. many time when in search of a problem, people go for the technical side and over look the simple. how many times on the news there's a story of someone on the highway with a body hitting an overpass due to a PTO engaged. yrs back while at mack a brand new mack dump was taken down the street to fuel up. the driver (not me) some how engaged the PTO , the raised body hit the over hang lucky no one in the fuel shack was hurt.. it does happen.

if the housing was changed with an after market replacement, the headlight ground may have a pop-rivet to the assembly which isn't completing a good ground.

as stated above sounds like ground issue. the pass side goes out possibly due to it's back feeding ground through the driver side. disconnect driver side takes away a poor ground to pass side. corrosion in plug will do it. trace the harness; might have broken/ fried wire

cardboard/ drain pail under front corner , little spray of brake clean and brush.

is the tag still on the door model /serial,, R611=== 673. R685 ==675 (doubt that one)

many years ago i started putting together the first gear B61 T&T sets based on the east coast fleets, had quite a few ; Adley Express, Yellow, Wilson, ETC, still have the St Johnsbury, and Lombard.

these "remember when" topics really get the brain cells going. the east coast had it's share of regional fleets:Lombard, Wilson, St. Johnsbury and an endless list of time gone by. when the topic starts with Matlack,Chemical Leman, and other major fleets no longer times have changed. being an ole Bast---- like i am LOL the gone to memory fleets list gets longer. was a major deal in the day to see the fancy yellow Monfort fleet fly through CT. don't know if they still run or not.

made an attempt to go out to garage today to look in that "special drawer" of home-made tools. the temp will have to go above the single digit first. modern technology (silicone) has replaced all the good stuff. one of the challenges back in the day was to see a transmission put together with this new white stuff silicone and not actual gaskets.

seems to me i had a HD box wrench that i heated up with a torch ; put an off set riser and bend in , cut off the open end was able to put small length of pipe on for leverage to tighten the inner bolt. before the days of silicone we put the brown tar -like permatex on the threads for sealant. sure we all have the one draw in the toolbox with custom made wrenches . problem with old age ; i look at the tools can't remember what i made them for.

todays news is showing the picture and saying packages will be late. seems to me if the trailer had partial load it would have slid back rapidly and flipped the entire unit over board. full load should have kept weight on trailer . no one hurt that's the important thing.

there's an outfit in CT that holds auctions having HD equipt ,i've noticed the fliers they send out don't have pictures of all the lots. there have been some good deals now and then . amazing the amount of auctions out there. spend alot of time searching Auctionzip.

I'll bet the driver's pants aren't. LOL

another positive with the 100 lb bottles;1 - i owned them no rental business,2- summer time i would hook one to the propane torch set up instead of using acy($$$). for basic heating or cutting, no ceiling furnace ,piping , plumbing . it worked for me but everyone has a different situation.

i tried the HD salamander type ; kerosene etc; besides the louder noise it would be 100 degrees in front of it and cold rest of the shop. also those needed electrical power , everyone said put in a wood stove ; not loosing all the floor space or piling wood in the shop. wood stove was in the house.

i had a 30x50 butler metal insulated with 14 ft inside height. i ended up with a contractors HD (100 k BTU ?) heater. had two 100lb bottles. on all day cold outside day i could work in tee shirt. it sure sucked down a 100lb bottle fast, but i could move it close to the project at hand and with the ceiling fan moving the air it was great. being around brake clean and other odorsi guess i never was bothered by "the smell"as others said. took all the wifes unused candles , chopped them and put the entire lot in a metal can on top of the heater. 1- made use of the candles, 2 smelled "pretty" when a visitor showed up!!LOL. no electric to pay $$ for. self contained unit

definitely a beautiful piece of machinery . parade fire trucks don't have wheels that nice. set up to go directly to a museum' i'd be afraid to drive it and get the wheels dirty.

the "new way" of thinking is count the pumps of grease, so i've heard. pumping till new grease shows ( the way i was taught also ) in some instances will blow out the seals if cams not shimmed proper. ever take off a wheel that has backing plates to find brake shoes covered with grease due to someone putting inner seal in backwards

77 is NOT an excuse ;;;; it's a REASON ..LOL . i'm on my way to 71. challenge is trying to answer questions on the forums when the brain thinks of the 60's=70's applications , comical when a post says " i have an old truck 20--; that's new to us old timers. to the topic, bronze bushings were used in all applications then. it was a world with out plastic parts.

i learned the wrong way many yrs ago about the trolley being hooked to rear brakes short version;;i picked up a brand new DM600 triaxle chassis from boston mack was heading back to waterbury ct mack. passing a truck ,he gave me "the lights" for ok pull back in right lane. as a thank you instead of putting 4-ways on i pulled the trolley !!! not good when you are in left lane with your foot to the boards. instead of just the flash of brake lights for thanks;; that chassis jumped and hopped almost went in ditch. as a youngin i didn't piss my pants but it was close