TAG AXELS

How does he keep the truck and trailer from binding up?? Not much clearance between the 2.

 

I'd love to see a pic of the underneath. Does it use a gullwing axle in the front ? Is there a one piece driveshaft going from the normal hanger bearing straight to the rear axle without clearance issues ? I'm considering ordering this set-up, but the salesman said he'd have to lie to the factory because the heaviest they can spec a single axle for is 120 000 # or so. I pull 63 500 kgs or about 140 000 # .

hmmm...... I was trying to reference KingHunter's pic

 

120 + 30-40% stress.... must work, till you got in hole ore overrun a good bump at high speed

 

There is a company in Russia, Yarovit, they build heavy duty cabovers for limited road use (really owners are in USA and UK). They make 8x4, 8x6 and 8x8 trucktors.



But this truck is like a mix of different trucks from all over the world. Engines Cat, Cummis ore Deutz, ZF tranny, SISU axes, self made frame and ugly cabine....

 

Very common here in the oil & gas industry because of the heavy loads...






and...







Here's a couple units I used to run, the first one didn't have planetary axles, but it was geared quite low with a top speed of 90 km/h (56 mph), although it had lots of power (CAT 3408 ) and gears (18 ), but originally came with a 12 (or 14?) speed Allison automatic. However, the Allison used to puke its guts on the ground when the nitrogen pump pressure unloaded (all our trucks used an "A-box" to transfer the engine power to run the pumps and if you didn't follow the proper procedure at the beginning or end of the job you could find yourself driving across the lease from the back or deck of the truck ).

 

no no i was thinking in case if you use 140 000lbs and single axle drive this is good for road but if you need to come off road differential can be easly broken so you have to use hub reduction

here we use them often but in last years less and less

in 70-80-90s almost all european trucks have them

today because of fuel less and less have them on road

but for construction logging recycling and similar applications they are still irreplaceable

although some fakers use hypoids in construction business and mostly in logging

here we can break even them(hub recudtion) very easy , my father broken one in february because of mud( so you all of time use full throtle and very agressive on clutch when starting ......) and heavy excavations diff ratio is ~4.67

those differentials (called "Europa achsen" or AP(ashse planetar) made by ZF (latter mercedes bought their licence) are one of best ever made when 30years truck finish its life in europe they send it or its part world wide (so rear ends have their new life)

those differentials have good capacity 45000lbs(not for puling but axle weight) per axle is not problem

and when you broke it you just buy another axle remove differential from it and place it in trucks diff and axle housing place on trailer because there is still no trailer axle which is able to took its amount of load.....

also i was speeaking with one dealer in germany who import old trucks from all europe cut them and send world wide

he told that many rear ends( chassis differentials and bogie) finish in US and in AU

 

Mine only clears by about 3-4"without a tag. Will hit on a very rare occasion.

The trailer in the pic had a ton of swing clearance, the new one we're ordering is going to have the same. I had to get a taller 5th wheel so I could slide my 5th wheel ahead of center.

 

My 14.0L Detroit (2005 with EGR) is set at 515 bhp and 1650 lb-ft. I run around 68,000 Gross Average and 25% Deadhead pulling 53' Vans and have been averaging 7.6 mpg At 65 mph the last couple of weeks.

Running 80,000 lb at 65 mph I average maybe 6.8 mpg at 65 mph.
Pre-EGR vs EGR = +0.3 mpg
C13 vs S60 14.0L = +0.4 mpg
Tag Axle = +0.3 mpg
Steer/Trailer Tires on TAG vs Lugs = 0.1

Thats roughly 7.0 mpg. Its not inconceivable that you would routinely get over 7.5 mpg but you might also get 6.5 mpg. Trucks can vary a lot according to how they are equipped and if they are operating correctly.

Its not hard to find someone here who gets 1.5 mpg worse with the same setup I have when pulling the same weight at the same speed.

PS Make sure the drive axle on that truck has a locker in it. You are going to want it with a 6x2.