Fifth wheel question

[cranetruck]

What is the height of the 5th wheel above ground for 2-1/2 and 5 ton truck tractors? What about a commercial truck?

Thanks.

 

[Recovry4x4]

Deuce tractor is 52 1/4" according to the manual.

 

[cranetruck]

Thanks...

 

[Towman2277]

I've got a Pete day cab outside and it's just over 50" in heighth measured at the king-pin.... hope that helps!

 

[cranetruck]

So, does another 5 inches hurt anything?

 

[73m819]

according to the -15-1, heigth for the 818 fifth wheel is 56.3"from the ground and for the the 819 it is 54.3"

 

[westfolk]

If the fifth wheel is in that area off the ground you're good. Every truck is going to vary depending on what suspension, tires and fifthwheel are used

 

[Towman2277]

That 5" will not make a difference.... the length that is behind the fifth wheel towards the back will. If your converting a truck, i'd keep it as short as possible. Tommorow I will measure the length from my fifth wheel to the end of the frame and post it on here....

 

[westfolk]

Steve has it right. Add to that what terrain you may be planning on running. A good rule is to have the frame long enough to be able to mount flaps behind the tires.

 

[m.walker]

My M52 is 56" , according to tm 43-0001-31 your M757 is supposed to be 55 1/4". My M750 ( 15,820 lbs. ) and my friends M127 ( 14,400 lbs. ) sits level on mine so you shouldn't have any problems , when you hook it'll drop some due to trailer weight . Plenty of tire clearance also so you shouldn't have any issues there . I'd love to see some pics of it hooked to some trailers for comparisons , I'm curious about the turning radius from the foot longer wheelbase of the M757 ( 206" ) compared to my M52's ( 194" ) , still not as long as M819's ( 242" ).

 

[73m819]

the 819 is so long, even a 172 is about the same length, it will be a real production backing up those short trailers, need a football field just to swing the front end to keep the trailer going where i went it to go, after i bought the 819, i found a old rogers lowbed real CHEAP that i was going to get till i mersured the trailer from king pin to center of axles, it was about 10' longer then the 819, right then and there i know that was not going to work

 

[rmgill]

Where's the Cheap Rogers?

 

[Scrounger]

Just have to remember overall height. For commercial trailers that are 13'6" 5th wheel height can't exceed 47 1/2". When I towed a 12'6" trailer with my 818 the overall height was 13'4"'.

 

[NEIOWA]

If you ever see a mil 5t (M813 or new) pulling a 6t semi trailer or the older model stake trailer you'll note the nose is "too" high. The 5th wheel height on the 5T is higher that the trailer design.

 

[73m819]

thats because those older trailers used 900x20 tires and ment to be pulled by a 2 1/2t tractor

 

[cranetruck]

Thanks for the information!

Walker, according to the TM 2320-230-10 manual, the turning radius is 42 ft 2 inches (with winch). Guess the weight of the winch on the front axle will add some resistance to turning. Without the winch , it's 41 ft 4 inches.
Remember that both front axles steer on the 757, which may effect the actual wheel base when making comparisons.