Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-29-2003, 02:11 PM   #1
Rivet Master
 
HowieE's Avatar
 
1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,811
Images: 12
Tri Axle Question

I have read a lot of the comments on axle replacement posted here but have addional questions.

My 91 34 ft Excella has always sat very low to the ground. The factory ID plate shows 2,300# axles and a GVW of 8,900#. The math doesn't add up. While I had never weighed the trailer empty it does weigh in at 10,000#s for a normal trip. The axle arms do have a positive angle, the rear of a center line drawn through the arm is above a line parallel to the frame. This angle is about 10 degrees positive by eye.

My first question is what are other tri axle owners seeing as far a factory plate, trailer height when sitting level, and axle arm angle.

My second question. Has anyone changed out the axles on there tri axle and if so what axle rating did you use.

I have spoken to Airstrem with no result. and have spoken to Henschin with the results that they say the positive angle is OK but claim they never made a 2,300# axle.

With over 90,000 miles I thought it was time to look in things
__________________

__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

HowieE is offline   Reply With Quote
Old 10-17-2003, 08:48 AM   #2
1 Rivet Member
 
stp2136's Avatar
 
Join Date: Jan 2003
Posts: 9
I had a 1987 34' Excella that had similar ratings. The axles were 2800# each (totaling 8400#) and a gross weight rating of 8900# which implies 500# on the hitch. I suspect you have 2800# axles as well. If you really weigh 10,000# loaded you are way overweight!
__________________

__________________
stp2136 is offline   Reply With Quote
Old 10-17-2003, 09:11 AM   #3
Rivet Master
 
RoadKingMoe's Avatar
 
2001 34' Limited
The State of , Ohio
Join Date: Sep 2002
Posts: 1,605
Images: 23
My axles are 3200# each for a total of 9600#. GVWR is 9800# which one might take to imply a 200# tongue weight.

However... with a 1100# tongue weight and 9800 lbs total weight, each axle would be carrying 8700/3=2900 lbs... IF, AND ONLY IF the trailer was perfectly level! If it's nose down, the front axle will be carrying more than the rear axle and vice versa. THAT's why the axles need to have a margin of extra capacity.

I'm not sure what's up with your trailer, but I find it interesting that yours is 8900 vs 9800 and 2300 vs 3200 with a transposition in the first two digits of each.

As I mentioned in private messages, my spindle centerlines are below the axle centerline, but that's with only perhaps 600#s on board. I'd believe they'd be closer to level with a full load.
__________________
Maurice
RoadKingMoe is offline   Reply With Quote
Old 10-17-2003, 10:30 AM   #4
Just an old timer...
 
85MH325's Avatar

 
Tipton , Iowa
Join Date: Mar 2003
Posts: 4,031
Images: 37
34' tri axle...

I checked my trailer's info the other day for Howie. My '94 tri-axle has 2800lb rated axles and a gvwr of 8900 lbs. The dry weight on mine is 7100lbs. If you consider the tongue weight at the rated 800lbs, it leaves about a 300lb (roughtly 3%) margin of error in the GVWR of the axles before overloading.

Howie PMd me and discovered after the umpteenth time of checking his trailer that his axles are also 2800lb rated. Apparently his GVWR tag was just difficult to read, and the "8" looked like a "3".

Obviously the newer wide-body trailers are heavier than the older 34s, and need heavier axles for their heavier GVWR.

Roger
__________________
AIR 2053 Current: 2006 Born Free 32 RQ Kodiak Chassis, & 1995 Coachmen B-van
Former Airstreams: 1953 Flying Cloud, 1957 Overlander, 1961 Bambi, 1970 Safari Special, 1978 Argosy Minuet, 1985 325 Moho, 1994 Limited 34' Two-door, 1994 B190 "B-Van"
85MH325 is offline   Reply With Quote
Old 10-17-2003, 11:34 AM   #5
Rivet Master
 
RoadKingMoe's Avatar
 
2001 34' Limited
The State of , Ohio
Join Date: Sep 2002
Posts: 1,605
Images: 23
Re: 34' tri axle...

Quote:
Originally posted by 85MH325
Obviously the newer wide-body trailers are heavier than the older 34s, and need heavier axles for their heavier GVWR.
Good point, Roger. I'd forgot about the narrow/wide body difference when I saw the transposition.
__________________
Maurice
RoadKingMoe is offline   Reply With Quote
Old 10-17-2003, 12:40 PM   #6
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
The 34 foot trailers had 2800 pound axles.

They can, in time, settle, causing a positive angle.

Generally speaking a positive angle, when loaded, means bottoming out will occur.

Replacement axles for the 34 foot trailer can be 3200 pounds, or if usually heavily loaded, they can be 3500 pounds each.

Different rating axles must never be used together.

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 04-08-2004, 10:50 AM   #7
Rivet Master
 
Elgin , Texas
Join Date: Jan 2004
Posts: 800
Images: 164
Quote:
Originally Posted by Inland RV Center, In
Replacement axles for the 34 foot trailer can be 3200 pounds, or if usually heavily loaded, they can be 3500 pounds each.
So, if I'm understanding this correctly, if I have an older 34' with 2800 pound axles in need of replacement, I can do so with either 3200 or 3500 pound axles, giving me a bit more leeway in terms of loading than I had previously?
__________________

bake315 is offline   Reply With Quote
Old 04-08-2004, 10:55 AM   #8
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Dave.

Absolutely correct.

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 04-08-2004, 11:00 AM   #9
Rivet Master
 
Elgin , Texas
Join Date: Jan 2004
Posts: 800
Images: 164
Cool beans!

Thanks Andy!
__________________

bake315 is offline   Reply With Quote
Old 04-08-2004, 06:02 PM   #10
Rivet Master
 
Join Date: Mar 2002
Posts: 1,482
Images: 19
I thought the axle load rating applied only to what the axles carried, which would not include the axles themselves, while the GVWR is the whole load. In other words, even ignoring tongue weight the axles need only to carry the weight loaded upon them.

Or am I missing something?

Mark
__________________
j54mark is offline   Reply With Quote
Old 04-08-2004, 07:55 PM   #11
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
What does that have to do with increasing, if desired, the maximum carrying capacity?

Lets keep this out of engineering theories, so as not to confuse the true issue of increasing weight carrying capacity.

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 04-08-2004, 08:06 PM   #12
Rivet Master
 
Tarheel's Avatar
 
2001 34' Limited S/O
Moyock , North Carolina
Join Date: Feb 2004
Posts: 1,010
Images: 21
Andy after pulling my tri axel for 25,000 miles or more I finally got around to weight it. the truck weighs 7160 solo, 7880 with the trailer on it but trailer wheels not on scales and 16640 truck and trailer. My question is tongue weight I only have 720 lbs on the tongue of a 9480 lb trailer or 7.6% it rides level but should I shift some more weight up forward? Getting ready to make a cross country trip on the Southwest Caravan and want to be as safe as possible.

Rick
__________________
Keep the shiny side up.
WBCCI # 348
Past Region 3 President
Past President Tidewater Unit 111
Rick Bell in "Silverbell"
Tarheel is offline   Reply With Quote
Old 04-08-2004, 08:58 PM   #13
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Rick.

Tongue weight should be between 10 and 15 percent of the gross trailer weight.

By various tests, a 12 percent tongue weights seems to be the ideal.

A little more, or, a little less than the 12 percent is OK, but certainly no less than 10 percent or more than 15 percent should ever be considered.

Tongue weight can easily be adjusted by placement of the variable load.

Always travel with a "FULL" water tank. It helps the tongue weight, "AND," lowers the center of gravity.

All of the above applies to those that use a "proper" load equalizing hitch, properly installed and properly adjusted.

If you tow an Airstream trailer with just a ball, sooner or later, you will become a statistic. The laws of Physics, says so.

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 04-08-2004, 09:57 PM   #14
Rivet Master
 
Join Date: Mar 2002
Posts: 1,482
Images: 19
"I thought the axle load rating applied only to what the axles carried, which would not include the axles themselves, while the GVWR is the whole load."

Quote:
Originally Posted by Inland RV Center, In
What does that have to do with increasing, if desired, the maximum carrying capacity?
Andy
Nothing, nothing at all. But then, increasing the maximum carrying capacity wasn't really the initial question, now was it? HowieE was trying to figure out how a coach with a GVW of 8900 lbs could have three axles, each rated only to 2300 (later corrected to 2800) lbs. I wasn't the one who wandered off into tongue weights.

So the question remains - three times 2800 is only 8400 lbs. The coach is rated to 8900 lbs. How is this possible? I asked the question, and I'll ask again using different words, is this because the axles CARRY 8400 lbs., while the entire coach weight cannot exceed 8900 lbs.? Or does an axle's weight rating include its own weight? If so, then we do come back to tongue weight after all, or so it would seem.

And If HowieE buys your 3200 lb. axles, what is the point? Does it increase his GVW? If so, what is the new GVW?

If this is too much "engineering theory", I will retire.

Mark
__________________

__________________
j54mark is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Axle Question drex Axles 7 07-30-2007 06:50 PM
Sorry. Another axle question whistler Axles 6 08-28-2004 11:33 AM
axle swap question garry Axles 4 10-08-2003 03:39 PM
axle question stp2136 Axles 1 10-05-2003 08:05 AM
Axle Offset Question DanLyle Axles 11 08-28-2002 10:35 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:53 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.