Popular Post Smoothy Posted July 10, 2020 Popular Post Share Posted July 10, 2020 Hi y'all, I just picked up an old B61 dump truck. I've been searching for a dump for awhile now and have been waiting for the right one to come up. My Dad and Grandpa ran a R model 300/ 10 speed for along time when I was a kid well into my teens as part of their heavy equipment company. We've still got it but it's been down for the last 5 years or so. I always loved the old bulldog, so I knew what brand I wanted. I usually have a tendency to like messing with older machines, old motorcycles, and old cars. It's kind of my thing and what I'm know by my friends for. As recently as last week my Dad was going through the local and surrounding area on Facebook marketplace looking for trucks and came across an ad for a 1960 Mack B61. He showed me the pictures and I was sold. We went down to Imperial, Mo near St. Louis to look the truck over. It hadn't been started in quite some time and we had fully expected having to do some work on the truck in order to get it running. We pulled in the drive where the truck and to our amazement the owner already had it running! It's got a Mack 300 engine, I think its an EM6, with the Quadruplex 20 Speed trans, and 4.66 rear end gear. Ended up getting what I think is a real good deal on a running driving truck. I'm pretty darn excited to learn how to drive this thing. I've been around heavy equipment my whole life, but this is my first truck, and at 23 I'd like to think I'm lively enough to keep up with shifting that 20 Speed. Any of you vets got any tips for a young guy in an old mack? Particularly on shifting when loaded vs unloaded. I've also figured out why some of you guys carry pry bars in the cab. I've had the shifter hang up in my 56 Chevy before getting stuck in between shift gates, so when the compound lever got jammed up from not squaring off the shift pattern I knew what to look for. Climbed under the truck and got her back in neutral. I've only had it home for a couple of days, but I'll throw some pictures up for you all to enjoy. Bringing it home on the lowboy through St. Louis 8 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/ Share on other sites More sharing options...
terry Posted July 10, 2020 Share Posted July 10, 2020 Are you sure it is a 300 horse? maybe post a couple pics of the engine. If the engine is original , not a 300. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455480 Share on other sites More sharing options...
hatcity Posted July 10, 2020 Share Posted July 10, 2020 The torque from the engine can tear up the quad box AS STATED ABOVE, CHECK ENGINE FOR TAG, OR POST PICS 1 Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455487 Share on other sites More sharing options...
Scottyairborne Posted July 10, 2020 Share Posted July 10, 2020 Sweet old truck, enjoy it. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455488 Share on other sites More sharing options...
j hancock Posted July 10, 2020 Share Posted July 10, 2020 Nice B! 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455489 Share on other sites More sharing options...
h67st Posted July 10, 2020 Share Posted July 10, 2020 Looks to be in decent shape! Good catch. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455495 Share on other sites More sharing options...
HarryS Posted July 10, 2020 Share Posted July 10, 2020 Very nice. You're going to love it. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455508 Share on other sites More sharing options...
mrsmackpaul Posted July 10, 2020 Share Posted July 10, 2020 Yep as said above, nice old jigger You'll find once your used to the quad box it will be pretty easy and you will only use half the gears Even if you have a full load on you wont use all the gears as some are almost the same and after a while you will stop using the clutch once your rolling and the oil is warm Have fun and welcome Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455535 Share on other sites More sharing options...
Red Horse Posted July 11, 2020 Share Posted July 11, 2020 Nice-have fun with it. rears 38's??? And the visor? ugh-but I'm an old guy😎 2 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455559 Share on other sites More sharing options...
Maddog13407 Posted July 11, 2020 Share Posted July 11, 2020 5 spokes are usually 34's. front axle has me puzzled. looks like a Rockwell out of a newer Mack 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455562 Share on other sites More sharing options...
Smoothy Posted July 11, 2020 Author Share Posted July 11, 2020 I went ahead and took some pictures of the engine for you guys today. I know casting numbers don't say a lot, but there were no engine identification tags on this engine. I was looking for tags behind the injection pump but the block is bare. Can't find any stamping marks like you would expect with a serial number. The E6 in our R model has tags and is very similar other than not having an air inter cooler, what I think is the block casting number was one letter off I think. All the photos I am posting are of the B61 and not the R. My pictures aren't great but they're better than nothing. On another note, what are you fellows referencing asking about 34s and 38's? Wheel Diameter? As for the front axle, I'll take some pictures tomorrow and post them up for you to get a better look at. Thanks! - Colton 2 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455566 Share on other sites More sharing options...
mowerman Posted July 11, 2020 Share Posted July 11, 2020 excellent have a ball.....you got it all,,,,,cool old rig,,,,with horsepower as well.....i noticed,myself....front and rear axles both look way newer than 1960....especially the oil hubs....bob Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455568 Share on other sites More sharing options...
mowerman Posted July 11, 2020 Share Posted July 11, 2020 and of coarse,,,welcome aboard...bob Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455569 Share on other sites More sharing options...
mrsmackpaul Posted July 11, 2020 Share Posted July 11, 2020 Definitely a coolpower job, 34's and 38's refer to the back end as in how many thousand pounds they can carry Need to sort something out for the air going into the tip turbine(needs clean filtered air into that big open hose) and she's ready to roll Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455574 Share on other sites More sharing options...
Maddog13407 Posted July 11, 2020 Share Posted July 11, 2020 put a hood scoop on her....with the filter. always wanted to do that to a B Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455585 Share on other sites More sharing options...
j hancock Posted July 11, 2020 Share Posted July 11, 2020 Check for the letter/numbers per diagram for engine block identification. If you can get the full Mack 313GC number off the pump tag, might be able to do some figuring that way as well. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455586 Share on other sites More sharing options...
mowerman Posted July 11, 2020 Share Posted July 11, 2020 ya thats where mine is .....bob Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455591 Share on other sites More sharing options...
Mark T Posted July 11, 2020 Share Posted July 11, 2020 That's a cool old B Model, does that have a Mack transmission in it ??? Quadraplex was kinda fragile with a 300. I ask cause you mentioned crawling underneath it when it was stuck in gear ? If it's a Mack 5 and a 4 way behind that then that's a little more durable with the 300. That old girl has air assist steering too I see. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455624 Share on other sites More sharing options...
h67st Posted July 12, 2020 Share Posted July 12, 2020 34's and 38's refer to... uh... yeah, the rear axles. That's it, the rear axles. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455641 Share on other sites More sharing options...
Red Horse Posted July 12, 2020 Share Posted July 12, 2020 23 hours ago, Maddog13407 said: 5 spokes are usually 34's. front axle has me puzzled. looks like a Rockwell out of a newer Mack Uh Maddog-ignore my dig on Visors-not intended to include Lunds😎 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455645 Share on other sites More sharing options...
harrybarbon Posted July 12, 2020 Share Posted July 12, 2020 Passion equals success 👍 we have the same inter-cooler on our E6-350, definitely a second air cleaner (dry element unit) to match the right side air cleaner, which should also be a dry element unit with your EM6 - 300 engine, it will pull real good Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455667 Share on other sites More sharing options...
Maddog13407 Posted July 12, 2020 Share Posted July 12, 2020 (edited) wish i had about 10 more Lund visors after i put that one on that truck.... ugh if we only knew back then Edited July 13, 2020 by Maddog13407 1 Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455669 Share on other sites More sharing options...
Brocky Posted July 12, 2020 Share Posted July 12, 2020 The Mack Quadrplex will hold up OK behind a 300 as log as you DO NOT LUG the engine. Keep your RPM's up.. 1 Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455697 Share on other sites More sharing options...
Smoothy Posted July 13, 2020 Author Share Posted July 13, 2020 9 hours ago, Brocky said: The Mack Quadrplex will hold up OK behind a 300 as log as you DO NOT LUG the engine. Keep your RPM's up.. That's pretty much what I figured. This truck has got plenty of logged hauls that were left in the glove box dated 1998-2001. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455751 Share on other sites More sharing options...
Smoothy Posted July 13, 2020 Author Share Posted July 13, 2020 Here's a better picture of the front axle and the power steering fluid reservoir. This one's been converted to power steering. Quote Link to comment https://www.bigmacktrucks.com/topic/63244-young-guy-old-mack-b61-dump-truck/#findComment-455753 Share on other sites More sharing options...
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