Popular Post Mack_plow_truck Posted May 19 Popular Post Share Posted May 19 Hello all. I purchased a mack rm688sx 4x4 with the intent of restoring and plowing with it. I still havent do much with it. It is powered by a 300 engine with watercool intercooler and a five speed maxidyne transmission. two speed transfercase. cool truck. I may be interested in selling. information is also appeciated. 3 Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/ Share on other sites More sharing options...
mowerman Posted May 19 Share Posted May 19 Interesting thanks for that. I’m sure you wouldn’t have any trouble selling it…. Bob Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-552046 Share on other sites More sharing options...
PMC Posted May 22 Share Posted May 22 Where in NH are you? I am in walpole. PMC Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-552311 Share on other sites More sharing options...
Mack_plow_truck Posted May 26 Author Share Posted May 26 I am in Dunbarton Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-552581 Share on other sites More sharing options...
Freightrain Posted June 27 Share Posted June 27 Looks like quite a beast. Welcome to the site. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-554349 Share on other sites More sharing options...
mowerman Posted June 29 Share Posted June 29 Not sure what this guy wants to do I guess he is not sure either hell with a rig like that I would definitely clean her up and use it especially in an area a lot of snow all the time $$$$$$$$ … bob Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-554488 Share on other sites More sharing options...
Mack_plow_truck Posted December 5 Author Share Posted December 5 one step forward two steps back... I have plans to clean er up and plow snow here in NH. I am in an osh kosh 4wd. The old sayin goes when I have the time I dont have the Money... when I have the money I dont have the time... 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563340 Share on other sites More sharing options...
Mack_plow_truck Posted December 5 Author Share Posted December 5 I like the truck Frieghtrain. that would get the testosterone threw the blood Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563342 Share on other sites More sharing options...
Popular Post Brocky Posted December 6 Popular Post Share Posted December 6 Many Municipality's in the "Snow Belt Region" Of upstate New York had these RM 4X4 Macks, many with double wings... When you start looking for parts check out the salvage yards and municipal auctions in a 100 mile radius of Watertown NY. 3 Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563356 Share on other sites More sharing options...
mechohaulic Posted December 6 Share Posted December 6 I know I haven't kept up with the new trucks but description states a WATERCOOLED intercooler. not knowing the year ; being a 300 is it possibly an AIRCOOLED (tip turbine ) 300 ??? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563362 Share on other sites More sharing options...
cruiseliner64 Posted December 6 Share Posted December 6 9 hours ago, mechohaulic said: I know I haven't kept up with the new trucks but description states a WATERCOOLED intercooler. not knowing the year ; being a 300 is it possibly an AIRCOOLED (tip turbine ) 300 ??? Maybe its like our Cruiseliner EM6 300 with the intercooler bolted to the rad.Its still air to air intercooling but could be mistaken as part of the rad by soneone not familier with the set up... Paul 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563370 Share on other sites More sharing options...
Popular Post terry Posted December 6 Popular Post Share Posted December 6 11 hours ago, mechohaulic said: I know I haven't kept up with the new trucks but description states a WATERCOOLED intercooler. not knowing the year ; being a 300 is it possibly an AIRCOOLED (tip turbine ) 300 ??? They had a combination water and air tip turbine intercooler. Terry 3 Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563374 Share on other sites More sharing options...
mowerman Posted December 6 Share Posted December 6 Yeah, and don’t forget the weather doesn’t cooperate a lot of times and I dont feel like getting out there now I have time and money and don’t like our winters … good luck, bud Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563380 Share on other sites More sharing options...
Brocky Posted December 6 Share Posted December 6 Either way a snow plow has trouble getting air unless it has the flapper valve to draw air from under the hood. 2 Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563384 Share on other sites More sharing options...
cruiseliner64 Posted December 6 Share Posted December 6 1 hour ago, Brocky said: Either way a snow plow has trouble getting air unless it has the flapper valve to draw air from under the hood. Nice one..never thought of that problem with a plow.We get very little snow so the road authority just hires wheel loaders to clear the roads.My brother was part of the management team in Shannon airport where because of the airports intetnational status it has to have a fleet of plows at the ready.15 years ago they bought 10 new Iveco plows and last year they replaced them with new plows....The Ivecos were NEVER used....They were maintained and drove around the airport to keep them up to scratch.That shows how often we get snow here.. .. Still gets dam cold though. Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563394 Share on other sites More sharing options...
mowerman Posted December 9 Share Posted December 9 About the same thing here most winners we only get a few inches and it’s melted off by a noon time just don’t like the cold air quite a stretch not always sometimes we get socked in thankfully I’m retired now and most days I don’t have to go anywhere 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74169-mack-rm688sx-4x4-plow-truck/#findComment-563543 Share on other sites More sharing options...
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