Brocky Posted June 5 Share Posted June 5 9 hours ago, mowerman said: Is that a 9500 hiding???? Looks like it has a "Bowtie" on the hood??? Did they build a 9500 with a short hood??? Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577076 Share on other sites More sharing options...
mowerman Posted June 5 Share Posted June 5 heh i think your right chevrolet,,bob Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577077 Share on other sites More sharing options...
mowerman Posted June 5 Share Posted June 5 i think the short hood jimmy is a 7500 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577078 Share on other sites More sharing options...
Smoothy Posted June 10 Author Share Posted June 10 Yes, the black tandem dump is a Chevy. I think its a C90, which is, according to my quick google search, the same thing as a GMC 9500. There's also a 9500 GMC Short Hood at the farm that's a tandem tractor. The black one has a 3208 and twin sticks, the tractor is an 8v-71 13 speed. The old GMs are neat in their own way. I wouldn't mind having a few more runners around. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577244 Share on other sites More sharing options...
cruiseliner64 Posted June 10 Share Posted June 10 2 hours ago, Smoothy said: Yes, the black tandem dump is a Chevy. I think its a C90, which is, according to my quick google search, the same thing as a GMC 9500. There's also a 9500 GMC Short Hood at the farm that's a tandem tractor. The black one has a 3208 and twin sticks, the tractor is an 8v-71 13 speed. The old GMs are neat in their own way. I wouldn't mind having a few more runners around. REAL NICE...Your living my dream...Class collection of trucks... Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577245 Share on other sites More sharing options...
Popular Post Smoothy Posted June 11 Author Popular Post Share Posted June 11 17 hours ago, cruiseliner64 said: REAL NICE...Your living my dream...Class collection of trucks... Paul Thanks, Paul. We just call it generational hoarding. 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577317 Share on other sites More sharing options...
cruiseliner64 Posted June 11 Share Posted June 11 8 hours ago, Smoothy said: Thanks, Paul. We just call it generational hoarding. Whatever its called im in!!!..... Paul 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577325 Share on other sites More sharing options...
mowerman Posted June 11 Share Posted June 11 i would like to own any of them,,bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577339 Share on other sites More sharing options...
Smoothy Posted June 11 Author Share Posted June 11 On 6/10/2025 at 12:19 AM, Smoothy said: Yes, the black tandem dump is a Chevy. I think its a C90, which is, according to my quick google search, the same thing as a GMC 9500. There's also a 9500 GMC Short Hood at the farm that's a tandem tractor. The black one has a 3208 and twin sticks, the tractor is an 8v-71 13 speed. The old GMs are neat in their own way. I wouldn't mind having a few more runners around. I stand corrected. The Chevy is a 68 C70. Anyhow, I spent a day working on the R model yesterday. I thought I had tracked down an engine oil seep coming from the oil fill. After removing and replacing the gasket I think it might be coming from one of the plates on the side of the block behind the injection pump. Looks like a challenge. I also need to figure out what the clutch adjustment procedure is to determine whether I have a worn clutch or poor adjustment. Its not slipping, just engaging pretty high up towards the top of pedal travel. The cable/linkage setup is unlike any I've ever fooled with, aka never a big truck. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577348 Share on other sites More sharing options...
Popular Post mrsmackpaul Posted June 12 Popular Post Share Posted June 12 I had typed out a reply, a big long drawn lot of waffle Anyway, EzrEzrider359 used to be on here I haven't watched it all but he gives a few minute video on the waffle I was trying to explain I feel your truck clutch will be similar Or at least the older Macks I have worked are adjusted like this Paul 1 4 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577368 Share on other sites More sharing options...
Popular Post Smoothy Posted June 18 Author Popular Post Share Posted June 18 Thanks, Paul! I'll check it out once I get it back home. Got my first job with it hauling a few loads on an inground swimming pool removal. It's just an on site job, but I'm happy to have the chance to run it. 2 2 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577711 Share on other sites More sharing options...
Popular Post mowerman Posted June 18 Popular Post Share Posted June 18 Hell, I would gladly take your place for a few rounds no charge ha ha 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577746 Share on other sites More sharing options...
Popular Post mrsmackpaul Posted June 18 Popular Post Share Posted June 18 3 hours ago, mowerman said: Hell, I would gladly take your place for a few rounds no charge ha ha At least until cocktail hour ha ha 🍹 Paul 1 1 3 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-577761 Share on other sites More sharing options...
Popular Post Smoothy Posted June 25 Author Popular Post Share Posted June 25 Got a couple of things done today on the R model. Got the clutch adjusted and it sure made a big difference on how the truck shifts. Thanks again Paul for the video from EZ. Also got the build sheet and rest of the papers from the Mack Museum. What a neat service they've got. The truck hasn't been changed too much through the years, other than of course converted from tractor to dump. It's not nearly as heavily built as my B61, but it's sure earning its keep. Looks like it was built in Canada and sold through the Mack dealer in Terre Haute. It was spec'd and ordered by Solar Sources, a mining outfit in Indiana. Kinda neat that it came back to a mining family. 2 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-578036 Share on other sites More sharing options...
mowerman Posted June 25 Share Posted June 25 excellent,,,lets keep it going,,bob Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-578052 Share on other sites More sharing options...
mowerman Posted June 25 Share Posted June 25 On 6/11/2025 at 1:53 AM, cruiseliner64 said: Whatever its called im in!!!..... Paul thats all i do around here,,,and thats why i can never find anything,,,bob Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-578053 Share on other sites More sharing options...
Smoothy Posted yesterday at 10:43 PM Author Share Posted yesterday at 10:43 PM What exactly is this thing? It seems I've developed my first air leak on the new R. Its leaking air out of the jet looking looking orifice under the 90° fitting. Not sure where to go from here. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-582406 Share on other sites More sharing options...
mechohaulic Posted yesterday at 10:52 PM Share Posted yesterday at 10:52 PM best suggestion is to trace the lines as far as possible . the valve can be used in a number of configuration systems.#6 aeroquipt to a 1/2 - 5/8 plastic can be ??? Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-582409 Share on other sites More sharing options...
Smoothy Posted yesterday at 10:56 PM Author Share Posted yesterday at 10:56 PM 2 minutes ago, mechohaulic said: best suggestion is to trace the lines as far as possible . the valve can be used in a number of configuration systems.#6 aeroquipt to a 1/2 - 5/8 plastic can be ??? Looks like the braided line runs into the intake manifold and the other tees into a pair of lines running into the cab and under the dash. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-582411 Share on other sites More sharing options...
Smoothy Posted yesterday at 10:57 PM Author Share Posted yesterday at 10:57 PM Here's a pic of the braided line. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-582412 Share on other sites More sharing options...
Smoothy Posted yesterday at 11:05 PM Author Share Posted yesterday at 11:05 PM It must be associated with the parking brake system. I had the brakes released on the truck to check slack adjusters and when I pulled the knob to set the brakes it quit leaking. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-582414 Share on other sites More sharing options...
mechohaulic Posted yesterday at 11:07 PM Share Posted yesterday at 11:07 PM went back to square one (2020) , it's a B with 300 engine, that regulator valve could have been installed in a number of systems. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-582415 Share on other sites More sharing options...
mechohaulic Posted yesterday at 11:09 PM Share Posted yesterday at 11:09 PM 2 minutes ago, Smoothy said: It must be associated with the parking brake system. I had the brakes released on the truck to check slack adjusters and when I pulled the knob to set the brakes it quit leaking. that case a 'POSSIBLE air can leak ??? keep in mind this unit has a number of challenges == old mixed with new !! 65yr old marries a 20 yr old !!! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-582416 Share on other sites More sharing options...
Smoothy Posted yesterday at 11:16 PM Author Share Posted yesterday at 11:16 PM 4 minutes ago, mechohaulic said: that case a 'POSSIBLE air can leak ??? keep in mind this unit has a number of challenges == old mixed with new !! 65yr old marries a 20 yr old !!! This is actually on my 77 R model, but regardless who knows who has messed with what. It's not an air can leak as it is leaking directly out of the plastic piece with the arrow pointing to it. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-582419 Share on other sites More sharing options...
Mark T Posted 23 hours ago Share Posted 23 hours ago Reversing relay for the puff limiter. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/page/5/#findComment-582428 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.