mechohaulic

double check without trolley might be the dual air system , dump plumbed for tag basically is same system as tractor set up for hooking a trailer.

it also depends on the unit. a dump truck might have a trolley on the column which would also apply the truck service brake providing the dump was NOT set up to pull a tag trailer with air brakes. some double check valves have the brake light switch allowing the brake light to work with pedal or trolley application.

there are a couple of B model operator manuals on e_bay . i had a bid on one ;was out bid. these are NOT service manuals just the operator books that came with new trucks back then.

the valve in question should be the double check valve for the trolley valve on the steering column . pedal application has air through the valve to back brake valve same time the shuttle in the check valve closes air to the trolley valve. pulling down trolley sends air through check valve switches shuttle to close off pedal and send air brake valve .keep in mind, i discussing older vehicles. not many have trolley valves from what i hear.without the check valve there would be and exhaust of air from application not being used.

if the picture of the rear spring hanger is the actual truck being discussed, this ole man wasn't that far off in the text of check rear hangers LOL, picture looks as tho the pin in spring is way worn. i would take HD bottle jack ; 20 ton (over kill) always worked for me. place jack on top of spring between spring and bottom of frame rail closest to rear hanger , jack up to see how much play in pin bushing. looks definitely worn in picture. as previously stated; job for spring shop and not a safety hazard just a noise till $$ and time to tie up unit for proper repairs. almost looks like movement on the bolts holding rear hanger to frame -maybe not.

if the noise seems to be under your feet, my question is ; what are the rear hangers looking like? i've seen the rear spring bushing break the welds on turning the spring would slide sometimes making noise. if the rear of the spring rides in a saddle without pins , i've seen worn saddles with groves and the spring will make noise on turns also

might be the gold dog was installed to make the parade vehicle look better . very few spectators would notice. gold dog blends with gold pin stripes. trophy wise, pretty is points to the judges.

where is this unit located ; are you in sub=zero new england and truck parked outside ? frozen fuel lines? can't help much with the VMAC stuff. i go back to simple kysor shut=down days. if it started right up don't thing its in sub weather.

same as the plastic lines replaced copper brake lines on the old trucks, the very expensive braided line is a replacement for the copper discharge line. modern tech ;easier to install on the assembly line also. #10 line for flex to the tank/dryer , biggest issue i've seen is the usually 90 degree fitting at the tank . cold weather is the first freeze point.

nice truck. i just found out this week, a R model fire truck i set up and delivered to winchester fire co in windsted ct back in sept 1971 is still at the fire house used for parades etc. i thought it would be gone by now. warm weather ever shows up i plan on making short trip to see it. only time i ever made front page news LOL . maybe that's a good thing.

trump has the right ideas, just not the political ass -kissing attitude. same crap happened to a selectman in our town yrs ago when he wasn't a politician just a life long resident trying to straighten the town.he was black balled if he walked out the door the wrong way. like clint eastwood - good guy shows up to clean house the bad guys do him in. one of the best bumper stickers i ever saw read " i love my country .it's the government i hate"

welding as with many talents is like riding a horse, first time in the saddle you fall off; with a number of attempts you stay on!! videos definitely help. practice makes perfect. welding/brazing has to be one of the best and fun skills. first time i welded it was putting a 24 in sliding fifth wheel on a R685st , 7 lbs of rod ; no wire feeds back then. talk about being nervous , i miss working on the real ones ; with the 1/25 scale trucks i can still stay busy during cold weather LOL. expecting single degree numbers in CT next few days. im finding time to repair trucks sitting in boxes for 30-40 yrs. work on yours is looking great

back in the day ; '70's lenny Masello owned west haven ct mack branch. seems i heard bridgeport mack was a factory branch. lenny bought bridgeport mack = no one ever said it lost it's factory statis . bridgeport had a larger building and yard . never heard customers talk about better deals there. as said in previous text, factory branch just had to do with ownership. then watebury mack was bought by lenny. unlike today if someone wanted a particular vehicle, branches would swap from one dealer to another. no one mentioned as i was leaving albany NY branch with a single axle F-model ;"ya might want to let some air out of the tires for the long ride"; no air ride then .and i have a bad back :why LOL.

did you take the service line off the can to see if air is by-passing internally in brake chamber ? parking brake air is putting service brake on enough to heat the wheel. if that's the case, there should be air leak also out quick release valve.

THANK YOU for adding web site; i'm not that computer orientated to do those things;; LOL and my grandkids were'nt around😄 . i had a lot of that stuff yrs ago. as the saying goes " things change"! in a lot of ways; sure do miss those days.

update/ correction on auction info it's Jacquier auctions location is Southwick , Mass. 01077 pictures show large lots of useful (to the right person) parts.

can't see the scratches and dings in the picture. so no can of polish yet a can of compound instead ;LOL , good luck on such a great purchase.

guyott oil from new haven ,CT had a fleet of the long nose brockways also. green tractor pulling alum tank was sharp looking. had a neighbor who drove one. rims always clean and painted.

now there's a question i never thought of . didn't know NY had any . can't recall anyone on east coast having one. casey,hallamore,gerosa etc always had the M's for big hauls. even those were big not 6x6.now it's got the brain cells going for a 1/25 scale build. past post showed a RD800 don't think it was 6x6.

at 70 yrs old and eyes that don't work as well can't tell if it's a gold or silver dog on hood . hopefully in time you can post more pictures with specs. single axle possibly 237with duplex ? older green interior

that's quite the find. 10yrs sitting and no BB holes in windows. all emblems are there! can of wax and its done-LOL. maybe some air in tires. '69 one of the better R's. solid hood no three piece like later yrs.

another pass it on note; there is an auction of truck/ towing related items on line starting 1-5-22. nothing to do with me just putting info here, Jaquier auctions online Prifti motors towing (northeast). no address showing . quite a bit of garage related items and parts, shop tools etc.

So sorry for Your loss Red Horse.this year there will be two less relatives to spend the Holiday with blamed on covid. my first wife lost her battle with cancer just over a yr ago . even being a Polish Catholic boy. it's a challenge to say Merry Christmas with so many facing difficulty in todays world. now it's "have a Blessed Christmas " and have the best day possible. have a MERRY CHRISTMAS

high hopes there would be little interest day of auction and boxes of parts and truck would go reasonable to the right person.

don't know if this is of interest to anyone; found on auctionzip. has nothing to do we me; hopefully passing on worthwhile info. jan 1 2022 Densmore auctions in madison OH shows a '64 B model with apparently many parts in boxes. i'm in CT renting with no place to put it.LOL . auctionzip for me is toys now not the real ones anymore.