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Old 12-20-2018, 06:46 AM   #1
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Front Axle

Is it me, or is the 14K front axle ont the XLT's seem like it could use another 3K ?


It seems most other coaches are 16K or better.


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Old 12-20-2018, 08:20 AM   #2
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I suppose you're talking about the FR Berkshire XLT line, and not your Allegro Bus, but I also suppose any coach only needs an axle that handles the weight that sits on it... are you saying they are overweight on the front axle?
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Old 12-20-2018, 10:06 AM   #3
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Originally Posted by formerFR View Post
I suppose you're talking about the FR Berkshire XLT line, and not your Allegro Bus, but I also suppose any coach only needs an axle that handles the weight that sits on it... are you saying they are overweight on the front axle?

I can't say, as I currently do not own a Berkshire. But it has the same generator and same 150gal fuel tank up front. My Bus comes in at 16K.


Just curious what other owners that may have had their coach weighed thought.


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Old 12-21-2018, 01:44 PM   #4
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My front axle on my XLT has a total weight of 12,580 pounds fully loaded including 150 gallons fuel. A 14,000 pound axle is adequate
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Old 12-22-2018, 04:49 PM   #5
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I have not weighed mine but have front at 100 and rear at 95
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Old 01-01-2019, 06:08 PM   #6
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I have not weighed mine but have front at 100 and rear at 95
CZNEDY,
I recommend that you do a 4-point weight analysis of your rig. I also have a 34QS, and I'm running 100 (cold psi) in the front and 105 (cold psi) in the rear.

Here is the analysis that lead to this:

First, here are the tire and axle maximums:
Goodyear G670RV Unisteel
255/70 R22.5
Load Range H
Max Load 5510 lbs (Single Tire) and 5070 lbs (Dual Tire), when running the max Pressure 120 PSI (cold)
Tread: 5 plies steel cord
Sidewall 1 ply steel cord

The maximum axle loads (GAWR) in pounds for the Berkshire according to its brochure and the white sticker above the driver are:
Front: 10,500 lbs or 5250 lbs/tire
Rear: 17,500 lbs or 4375 lbs/tire
Total GVWR 28,000 lbs

The Goodyear 2010 load inflation guide for 255/70 R22.5 tires says:
100 psi covers 4895 lbs (front, single tire)
105 psi covers 4455 lbs for each of two rear duals (above the rated axle load)
110 psi covers 4675 lbs for each of two rear duals

I've recorded two 4-point weights on our 2015 34QS
On May 18, 2016, I had one driver, no food or water and 3/4 tank of fuel:
LF: 1930 kg or 4255 lb
RF 1770 kg or 3902 lb
Front Axle 3700 kg or 8157 lb, or 2343 lb below the allowable load of 10,500 lbs.

LR Dual: 3650 kg or 8047 lb (4023 lb per wheel)
RR Dual: 3990 kg or 8796 lb (4398 lb per wheel)
Rear Axle: 7640 kg or 16943 lb, or 557 lb below the allowable load of 17,500 lbs.

On October 15, 2016, I had a full load of fuel and propane, driver and one passenger, no water, but food for camping:
LF: 2070 kg or 4564 lb
RF: 2010 kg or 4431 lb
LF: 3560 kg or 7848 lb
RR: 3350 kg or 7385 lb

Note that there are discrepancies, suggesting that the scales could have been different, or my loads were not as I described.

Taking the higher corner weights from the two sets of 4-corner weighings, and the higher weight for each corner for the same axle, we need to cover:
Front: 2070 kg or 4564 lb per corner
Rear: 3990 kg or 8796 lb per corner, which is 1995 kg or 4398 lb per tire.
Bear in mind that these weights are for no water in the tanks, and a full tank of fresh water weighs 716 lb or 179 lb for each rear tire.

This gives me the following maximums for a weigh scale, assuming 100 psi in the front and 105 psi in the rear:
Front GAWR: 4440 kg or 9790 lbs (limited by 100 psi of tires)
Rear GAWR: 7938 kg or 17,500 lbs (limited by chassis axle specs)
Rear GAWR: 8364kg or 18,440 lbs (limited by tire capacity and beyond chassis specs)

For a 4-point weight, the corner maximums are:
Front corners limited by tire weight limits at 100 psi: 2220 kg or 4895 lbs
Rear corners using Axle limits: 3969 kg or 8750 lbs (per dual pair)
Rear corners using Tire limits at 105 lbs: 4182 kg or 9220 lbs (per dual pair)

Of course, your numbers will vary because your weights, tires and chassis capacities could differ. But there shouldn't be much variation between 34QS models of various years, so I'd suggest that you should increase your rear tire pressures for safety. That gives a harsher ride at the rear, but that is not where you sit.

I'm not willing to drive with the tires overweight, but I'm prepared to take a load of water over a smooth road that goes a bit over the chassis specs. When I look at family cars loaded for vacations, I suspect that they commonly go over the chassis specs, but the drivers never run a weight check. The major danger is in overloading the tires.

–Gordon
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Old 01-01-2019, 07:37 PM   #7
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Front Axle

Thanks Gordon, I will do that this winter and see what my weights are. Just have to get back down to SWF where the RV is. We have a scale nearby in Ft. myers I can take it to see what my numbers are. I've driven ours a little over 11,000 miles in the first year and it's handled pretty well. We will check out the actual weights this winter.
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