ThaddeusW

Pictures would help allot! You should also try posting at Hanks Truck Pictures.

Wow that looks tight! To be honest, I like the look of the Renault cab. Its no Ultraliner but I suppose it served its purpose. Too bad the American truck makers never advanced their cabover designs like the Europeans did. I really like the look of those Euro trucks. I always try to picture what an advanced modern mack cabover would look like. On another note Finnish truck maker SISU makes some really tough trucks and they use the same cab but with their own frame and axles. Renault and SISU had an agreement that SISU would distribute Renault trucks in Finland. SISU at one point used the Renault Premium cab and Mack engines in their trucks with Fuller or ZF gear boxes. So essentially you had something similar to the Quantum but with a really strong SISU frame and axles. SISU now uses the Renault DXi 13 (AKA Volvo D13) but still uses the Renault cab with a much nicer grille. They also have CAT options for big power but no more Eaton gear boxes only ZF. Thanks for those pictures! SISU R500 crane truck:

TITAN is a true Mack name if you ask me. Chevy titan? Yea, sure, what ever. Nissan Titan....WTF! Mack TITAN oh yea Now all we need is the Bigfoot!

I hate to break it to you but Mack already has a light/heavy duty class 7/8 truck that is produced in Australia called the Metroliner. It is powered by a cummins ISC and has Allison and Eaton transmission options with Meritor axles on Hendrickson suspensions. It is mainly setup as a short 106" BBC mixer truck chassis with a 14.6k twin steer option and tandem rears to 46K. My money is they bring it here to the states following the Titan. The new Metroliner hasn't been unveiled in Australia so we have to wait to see what it looks like. Hopefully the hoods look allot better then the previous generation. Its pretty much a Mack CH cab with a short sloped hood sorta like the Kenworth T300. Two twin steer Metroliners:

You can spec the frame color from factory.

4.35 to 4.75 per Gallon depending on where the station is located here in New York City. Thats anywhere from 1.15 to 1.25 USD per liter or 1.27 to 1.38 AUD per liter.

Ok so the brake lights are stuck on the R685 and the switch doesn't have power on the hot side and the side that should be cold when your foot is off the brake is constantly hot? Hmmmm. Sometimes an open ground wire can cause havoc in a lighting system. Had an open ground on my GMC savanna and it caused all sorts of odd problem like the brake lights to stay on and when you hit the brakes the brake lights went out and the reverse lights came on! And to top that off the dash board lights blinked along with the turn signal. Found a single ground wire at the rear of the van that once screwed back to the chassis fixed all the lighting problems. An open ground leaves the current with no return path and sometimes it runs backwards through other lights and wires so start checking for bad ground wires at the rear of the truck. Also check all your fuses/circuit breakers for the lights and see if they are blown/tripped. If you replace it and it blows again its a short.

Hey Chris, If its possible to get the Quantum cab tilted and snap a few pictures of the engine bay? Would appreciate it.

Chris, This is a Euro brake diagram form a Knorr PDF I snagged from their site a while back. It only showes a single axle tractor but I am sure a tandem is close to this diagram.

Thats a tough request! Only pictures I have seen on one are from the brochure and another site but nothing from the side or rear. Here is a link to the Mack AU site with a picture: http://www.macktrucks.com.au/index.cfm?MenuID=197 And here is a picture form one of out members: I wonder if they are still going to make the Big Foot. Its a Titan hood and cab setup on a heavy frame with 110k planetary rears and 25" rubber. Probably at least a 23k+ front axle. Make a good dump truck

Doug, Wow I must admit that you are right in the fact that it is very similar to a 9900! A little disappointing but nevertheless its still a new Mack and I like it all the same.

Chris, If you look at the latest photos you can see the US air intake cleaners have a tube that extends downward and into the side so adding the verticle air intakes is a no brainer. I bet the could be specd if you wanted, or if thay arent availible order a set from Australia and put them on yourself.

I have looked over European air systems and they do have a very different setup but the basics are the same. Thaey even have a little less plumbing then we do and the addition of pressure test connectors to quickly and easily test air pressure in the various circuits. The load sensing valve you mentioned adjusts the air pressure to the brakes depending on the load, more weight more air pressure. Wabco, Knorr, and Haldex make them for the Euro market.

Maxville gets the prize! Two air switches in parallel makes sense as instead of plumbing one into the air lines just thread two right into the pedals primary and secondary ports and wire them in parallel so if one circuit goes out the other will still activate the lights. They are sensitive and have a crack pressure of 5psi. If the air pressure was less than 5 psi then you would definatly notice a slight problem with your brakes! You can fix them, see below: Here is a service data sheet from bendix: http://www.bendixvrc.com/itemDisplay.asp?documentID=4936 My advice would be to just replace the switch with one of similar type and call it a day.

Your truck is similar to my 88' GMC 6000 with a 350 gasser and hydraulic brakes. Have you tried a GMC truck dealer? You live not too far from me (Ozone Park, Queens) and I got GMC parts from Bruno truck in Brooklyn. Its expensive but then again they are a dealer. Ill try too see if I can find anything else out as my mechanic always gets parts for just about anything.

This is what I am trying to figure out. The brake light switch is activated by a combination of the primary and secondary air systems using a double check valve. It may be possible it was located or re-located to the brake pedal. There might possible have been or is a foot valve with an integrated stop light port. concrete animal, Do you have a manual transmission? If so make sure you are only looking at the brake pedal and not the clutch or go pedal. If its an Allison does it have the integrated retarder? I ask because there is a foot pedal from Bendix that activates the transmission retarder depending on how hard you step on the pedal.

Hmm ok so the switch should have two terminals on one side for the wires and the other side is threaded into one of the foot valve ports. I would buy another switch and just replace it. Just unhook the two wires and unscrew the switch and screw the new one in and hook the wires back up. If you have any more questions don't hesitate to ask.

Good stuff guys keep it coming. What was the highest HP rating for the 673?

On all trucks equiped with air brakes the brake lights come on with a switch that is turned on by the air pressure. Are you sure its mounted to your brake pedal?

There are many unpaved dirt roads in Australia's Outback so keeping the air intake up high keeps out dust and dirt. It also takes in the cooler air from up high when the ground temperatures are something like 130F+

Hey guys, I want to know the torque and horsepower for the 673 and 711 diesels as well as the 707 gasser. Turbo or non turbo I would like as much info as possible including torque/horsepower curves. Thanks

Hey guys my brother sent me this outstanding video that explains in laymans terms how the economy works and why we are in trouble. Ever though where all the money goes during a recession? Answer: it never existed in the first place and this video series explains why. Its pretty scary how the banks started this mess. Its a 5 part series so at the end of each 11 min video there is a link under the video to the next video. I suggest everyone watch this, its a real eye opener. http://www.youtube.com/watch?v=cy-fD78zyvI

Before the new site Mack Australia had a big selection of trucks availible. The raised cab heavy duty trucks were the Titan, Superliner, and Trident. The Titan is super heavy duty for tripple road trains and hauling up to 220 imperial tons with big CAT and Cummins engines. The Superliner was a toned down version for B double work and lighter road train work and also had CAT and Cummins power. The Trident had the same raised cab but had a shorter hood and was only powered by Mack E7 engines. They are all heavy duty long distance trucks made to take the high heat of the Australian outback and still cool the big engines pulling heavy loads. Oh and I bet the Metroliner will also make an appearance as a Mack class 6/7/8 truck to let them compete on the high end with Kenworth's T300 and Peterbilt's 335/340.

Hmmm the air line that runs to the air ride seat is also the same line that usually runs up to the horn but it could be different. As long as you plumb the line from the wet tank your good to go.