Dpf

[casa08]

I will soon be the lucky driver of one of our companies new 09 Granites. These will be the only 2 trucks in the fleet with the DPF, and nobody at the company seems to know ANYTHING about the system, all they do is complain and say what a pain in the you know what it is going to be. I suggested having the dealer come to our shop and have a small orientation on the system so everyone can get educated about it, but working with stubborn old drivers that is not going to happen, they would rather just complain about it and tell horror stories about "a guy they know" who told them something about them...

Anyways, I am curious about the ups and downs of the system. Main questions are-

-How often do I need to regen?

-How long does it take to regen?

-How often to service the filter, and is it a big job?

-Can I regen anytime, or do I have to wait for a warning light or something

-What happens if I interupt the regen process?

These are not over the road trucks, rather they are quad-axle dump trucks, hauling mostly asphalt in summer months, usually 50-60,000 miles per year. Hauling asphalt usually means lots of short trips (1/2 hour at most), along with alot of idling time throughout the day.

And finally is there a purpose to the goofy looking stack? It is a 4" pipe, but has a flat top with a cap, and the exhaust exits through a series of holes on the side of the pipe... The owner already removed these because he thought they looked dumb, I just wonder if that will affect anything...

Any info will be much appreciated! Thanks!

[cgallamore]

I will soon be the lucky driver of one of our companies new 09 Granites. These will be the only 2 trucks in the fleet with the DPF, and nobody at the company seems to know ANYTHING about the system, all they do is complain and say what a pain in the you know what it is going to be. I suggested having the dealer come to our shop and have a small orientation on the system so everyone can get educated about it, but working with stubborn old drivers that is not going to happen, they would rather just complain about it and tell horror stories about "a guy they know" who told them something about them...

Anyways, I am curious about the ups and downs of the system. Main questions are-

-How often do I need to regen?

-How long does it take to regen?

-How often to service the filter, and is it a big job?

-Can I regen anytime, or do I have to wait for a warning light or something

-What happens if I interupt the regen process?

These are not over the road trucks, rather they are quad-axle dump trucks, hauling mostly asphalt in summer months, usually 50-60,000 miles per year. Hauling asphalt usually means lots of short trips (1/2 hour at most), along with alot of idling time throughout the day.

And finally is there a purpose to the goofy looking stack? It is a 4" pipe, but has a flat top with a cap, and the exhaust exits through a series of holes on the side of the pipe... The owner already removed these because he thought they looked dumb, I just wonder if that will affect anything...

Any info will be much appreciated! Thanks!

great looking truck, i would drive it, and laugh at whoever passed on it. i think it would be great to learn the ins and outs of a new system on someone elses dime.

i think it would be a good idea to cotact the dealer and find out what you need to know whether the old timers do or not.

if your owner has the balls, i have read about running a piece of 4" pipe around the dpf , it still works, but routes 50% of exhaust around the system, i would research this alot before i tried it.

let us know how it goes......

[RowdyRebel]

great looking truck, i would drive it, and laugh at whoever passed on it. i think it would be great to learn the ins and outs of a new system on someone elses dime.

i think it would be a good idea to cotact the dealer and find out what you need to know whether the old timers do or not.

if your owner has the balls, i have read about running a piece of 4" pipe around the dpf , it still works, but routes 50% of exhaust around the system, i would research this alot before i tried it.

let us know how it goes......

just don't let the EPA catch you with that bypass to their mandated crap...the fine would cost about as much as the truck

[Mackpro]

I will soon be the lucky driver of one of our companies new 09 Granites. These will be the only 2 trucks in the fleet with the DPF, and nobody at the company seems to know ANYTHING about the system, all they do is complain and say what a pain in the you know what it is going to be. I suggested having the dealer come to our shop and have a small orientation on the system so everyone can get educated about it, but working with stubborn old drivers that is not going to happen, they would rather just complain about it and tell horror stories about "a guy they know" who told them something about them...

Anyways, I am curious about the ups and downs of the system. Main questions are-

-How often do I need to regen?

-How long does it take to regen?

-How often to service the filter, and is it a big job?

-Can I regen anytime, or do I have to wait for a warning light or something

-What happens if I interupt the regen process?

These are not over the road trucks, rather they are quad-axle dump trucks, hauling mostly asphalt in summer months, usually 50-60,000 miles per year. Hauling asphalt usually means lots of short trips (1/2 hour at most), along with alot of idling time throughout the day.

And finally is there a purpose to the goofy looking stack? It is a 4" pipe, but has a flat top with a cap, and the exhaust exits through a series of holes on the side of the pipe... The owner already removed these because he thought they looked dumb, I just wonder if that will affect anything...

Any info will be much appreciated! Thanks!

Please, get the Dealer/saleman to explain to everyone who is going to drive how the system works, it is not that hard to figure out, the late 09's had the self cleaning 7th injector which took care of most of the problems. We have several with over 350,000 mile and still have the orignal DPF filter and still going strong. I would leave the orignal exhaust tip, you dont want rain water going down in there and most all chrome tip out's wont last due to the high exhaust temp during regen. There are resaons mack puts these on there. Our sale dept did have some DVD's on the DPF for our customers.

[erymer]

I will soon be the lucky driver of one of our companies new 09 Granites. These will be the only 2 trucks in the fleet with the DPF, and nobody at the company seems to know ANYTHING about the system, all they do is complain and say what a pain in the you know what it is going to be. I suggested having the dealer come to our shop and have a small orientation on the system so everyone can get educated about it, but working with stubborn old drivers that is not going to happen, they would rather just complain about it and tell horror stories about "a guy they know" who told them something about them...

Anyways, I am curious about the ups and downs of the system. Main questions are-

-How often do I need to regen?

-How long does it take to regen?

-How often to service the filter, and is it a big job?

-Can I regen anytime, or do I have to wait for a warning light or something

-What happens if I interupt the regen process?

These are not over the road trucks, rather they are quad-axle dump trucks, hauling mostly asphalt in summer months, usually 50-60,000 miles per year. Hauling asphalt usually means lots of short trips (1/2 hour at most), along with alot of idling time throughout the day.

And finally is there a purpose to the goofy looking stack? It is a 4" pipe, but has a flat top with a cap, and the exhaust exits through a series of holes on the side of the pipe... The owner already removed these because he thought they looked dumb, I just wonder if that will affect anything...

Any info will be much appreciated! Thanks!

First thing first...congrats. The GU is one of my favorite trucks.

-How often do I need to regen? - see below

-How long does it take to regen? - see below

-How often to service the filter, and is it a big job? - 250K miles

-Can I regen anytime, or do I have to wait for a warning light or something - regen will occur only when needed.

-What happens if I interupt the regen process?

My first suggestion is to make sure you know how the smart switch works and what will happen in each position. It needs to be in the up or nuetral position. The down position is also know as the inhibit position (some truck so not even have this option). The only time you should have it in inhibit is when you absolutely do not want to fire off a regen (going inside a building or anywhere that high exhaust temps could cause damage to your surroundings). Putting the switch in inhibit will also limit your speed to below 15 mph. If you notice the truck will not go over 15 mph or will not get out of 2nd gear (for an auto shift) double check the switch. I've seen way too many trucks towed in for this very reason.

The regen frequency depends on driving style and driving conditions. Basically how quickly the DPF filter fills up with soot.Regen times will vary as well depending on what level the system is at and how full the filter is. You basically have 4 levels.

Level 1. Your Blue DPF smart switch will be lit with a steady light on the top half of the switch. This will let you know that a regen is needed. You can simply press the top of the switch for a few seconds to start a regen or you can do a parked regen if you like. Parked is not required at this point.

Level 2. Your Blue DPF smart switch will now start to flash. from here it will be the same as level 1. you can run a parked regen if desired or simply press the DPF switch while driving.

Level 3. This is am important level. This is the last chance that you the driver have any inpout on what happens. The DPF switch will now start flashing and you will also have the lightning bolt on the dash. At level 3 you MUST run a parked regen. With the truck running, you need to make sure the cruise is off and the parking brake is set. Once again make sure you are not parked under anything that your high exhaust temps could damage. Press the top of the smart switch.

Level 4. Once you are at level 4 your are in trouble. You cannot run a regen on your own and it will have tp have a service regen run by the dealer. The DPF switch will be flashing, and you will have the engine shutdown light on.

Now when you are running a park regen you press the smart switch. The engine will idle up, and as your exhaust temps rise the HEST light will come one. This just lets you know that the truck is regenning and the exhaust temps are very high. A park regen can run 30-60 minutes depending on your soot level. Once the regen is completed the truck will idle back down. The Hest light will only go out once exhaust temps drop. You do not have to wait for this to happen to drive. Driving will help it go out quicker.

This is the short version. Keep in mind this is for the DPF units that are located under the passenger steps. If you have the back of cab version on an LE or MRU some things will be different. These trucks will not idle up during a regen. They idle at 700 RPM instead of the usual 650. They have a fuel and spark source in the stack itself to handle the regen ignition.

This should be enough to keep you out of trouble. if you have any more questions you can feel free to send me a message and I can send you some stuff that might help. You can also call Mack One Call 800.866.1177(breakdown assistance) and one of the guys can answer more specific questions. I know this is longwinded but believe me when I say there is more to it.

Eric

[erymer]

duplicate post....please ignore.

Edited April 13, 2010 by Diesel