DieselDog5.9

Whoever posted this is my hero.

A few buddies of mine LOVE the 12 speed in dump trucks.  I could sell every 12speed I could get my hands on.

As it is 65 mph is 1800 rpm

11 hours ago, fjh said:

Even thou I am Mack Guy If owned a truck I would go Fuller 18 for the very reason stated above PARTS! You can repair /rebuild a fuller for 1/2 the price of the Mack trans! The only draw back is you need to find a Mack bell housing because of the mounts and the clutch shaft arrangements ! The 12 speed is the best dump trans as stated not viable for the reasons stated!

Just me!

I would have to buy a fuller 18 speed $5,000, find the fuller linkage and bell housing, Lengthen the drive shaft.

I have $1200 into the Mack 18 speed.

3 hours ago, Mark T said:

6.17s with an 18  😳 ? 

Woops, I made a mistake, just went to the file to verify from the specifications Mack gave us from the VIN:

4:64 rears

T309L Transmission

Does someone have a chart with the ratios for both transmissions so I can compare.

They made a 2100 ft/lbs torque version IIRC, for the cummins and Cats that you could get, Odd to me you would get a Cummins engine and choose a Mack transmission but I guess. I thought that was the 2180B

It would appear they are the same front box, but the rear box makes the 9 vs 18.

I have 4:64 rears and with the 9 speed it is just right for a trailer, 70mph is out of the question, I think the 18 speed would give me a reverse with a high split.

I did a 6spd to 12 speed swap before, and they apparently had an off road version and an on road version well just my luck I put a highway trans in a dump truck, worked out better than the 6 speed but still would have liked the off road version. 12 speeds are hard to find.

That extra gear between 8th and 9th is really what I am after.

Have a CV713 Granite, with an AI 400 that is finicky to drive, (working on the cure following the dead dog thread closely) however just need more gears.

Current Transmission is a Mack T309L/LL    great low speed reverse and low gear, short on gears in the high side, the rpm spread in the gears is to wide for the limited rpm range the Ai400 makes power in, and a mean shifting SOB.

Solution: picked up a transmission the owner states is and 18 speed, makes noise when on the low side.   This transmission is a T2180, not sure about any particulars, suchs as gearing and what not, my truck being an 03 would be a 300 series transmission, is this T2180 a bad choice? 

I have a lot of experience rebuilding Eaton Fuller transmissions, I have rebuilt the back box on a Mack 18 speed 300 series (318L/LL Maybe) and the parts are somewhat pricey for the HI/LO clutch pack from Mack.

Originally I was going to swap a Fuller 18 but thought going mack for mack would be less fabrication an coming up with parts.

Ice was totally blocking fuel line

The perfect transmission is an 18 speed, has an overdrive and a deep low gear.

With these transmissions you have one or the other,

13 speed you can split shifts on the high side and you will like that if you are traveling in the 45 to 70 mph range alot.

9 speed has a low that you will like on the jobsite.

•  What rear axle ratio do you have in the truck?
• What Engine do you have in the truck?
• What size tires do you have?

An E7 427 as far as I can tell is the best that Mack had to offer.  When these trucks were new their was some tuning the Mack garage could do to pull better power out of them.  

Looking back at your post this truck being a 91, it is a mechanical engine, you are better with that engine than any other.

As for parts: Iowa has a lot of options for truck parts, But compare prices, some truck dismantlers are higher priced than others.

Seems to be random, one morning it will fire up right off, another it will crank for a long time.  And warm or cold makes no difference.  I did pump the primer hard one morning when it was doing it and no difference which had me scratching my head.   I will look into the sensor issues, are the cam and crank sensors easy to locate, assume the crank sensor is above the harmonic balancer?

I have an AI 400, not sure if that is a "E-Tech", but the 400 falls on its face below 1500 Rpm, which is the complete opposite of what the old tride and true Macks of the 80's and early 90's did.  The transmission can make a big difference if you have some gears to work with, and multiple posts on here about solving some of these power issues.

Sometimes turn the engine over and it starts right up, sometimes crank it over multiple times before it will take off.  Changed the fitting on the side of the block thinking it was not holding fuel pressure, acts like a check valve that is not holding its prime.

Take the line off the range cylinder and put some air tool oil to it.  This may help an old dried out O-ring.

On 10/28/2021 at 10:52 AM, fjh said:

I have an added sequence when installing injector lines! It involves tightening the the injector down snug then backing it off to just touching tight! Then tightening  and torquing the line ! Theory behind this is it allows for the injector to find its happy place if there is any variance in the alignment ball in the head! Not sure if it helps on the e7  but have done this for ever! As we used to have issues with the V8 Lines back in the day, specially when they converted to the Robert bosch fuel pump  and were using the ball for elinment on the injector it seemed to help doing this! just something to try if you have a leaker!

 

This is similar to the sequence Cummins uses for injectors.

Pretty sure the buzzer died, the dash light says low air pressure but the buzzer doesn't come on, switching the power divider lock on or the turn signals on doesnt make it buzz either,( they use the same buzzer best I can tell)  The buzzer sounds like is integrated into the dash cluster and is almost a grand to replace.  So working on hooking up a regular buzzer from napa, the advantage is no buzzer when turn signal or power divider in.  But which switch is for the low air buzzer to tap into?

It is a Mack transmission, It was advertised as an 8LL, However it is not, It is an 8 speed with a low, no extra blue button Low, just down to the left low.  The tachometer, reads pretty high, and has various colors on it that it states are good for engine brake.

If I remember correctly the 310 is a version of the 18 speed Mack transmission.  Last 18 speed mack I had apart to repair the Hi/lo, the repair parts were almost the cost of a used Fuller 18 speed.

My 2 cents would be to look at it as 2 separate shifts, one to pull out of gear and one to put it into gear.  Personally I tap the clutch to pull out of say 5th gear when down shifting and float the transmission into 4th gear. 

Just bought a CV713 Granite dump truck.  I was looking for a fancy Peterbilt or Western Star with a C15 Cat or N14 Cummins, but those are big money.  I have a few customers in my mechanic business that have 03 Macks and they seem to get good service from them and day in day out they just haul dirt without the flash, so I followed their lead.  Coming out of a truck with a Big Cam 400 and a 15 speed, this Mack E7 400, Mack 9 speed is a totally different truck to drive.

Any driving tips for RPMs and such appreciated, also any issues I should be looking out for.

18 Front, 44 mack rears, Chalmers suspension, Mack 9 speed, single frame.

First I would like to say engineers are stupid, whoever designed this should just quite, and go sell kites at the beach.

Second is this normal? The plate is offset from some of the pins, says nothing in the service manual and I have twisted this plate until i was blue in the face, figure it must twist when shifted. Bought the "Update Kit" with new synchroniser plate and gears.

The owner of the truck insists on Mack parts, and I think the down time for him is the bigger cost right now,  tore it apart saturday, put parts order in this morning, could have parts Tuesday, fingers crossed. My fear is forgetting 1 oring that will hold up the whole job.

Judging by your comment puchasing the injector cup tools for C15 last month was a good investment.

I always thought Mack Transmissions were wicked rugged, 6 speed and 12 speed especially, figured 18 speed would be similar, didn't think you could break one.