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Tire Pressure Help
#1

Hello,

I’ve never had a coach with a tag so I would appreciate some guidance on weighing it.

No individual scales available in my area so I would use a CatScale.

I’m unsure how to position it on the scale and what configuration the tag should be in.

I’ve attached a CatScale weight I took after topping off the fuel tank and probably 1/2 tank water & 1/2 tank holding. Driver only...

Steer 16520
Drive 32580
Trailer 3000
I’m sure I had tag switch in the center position. 

Obviously I’m trying to get a full understanding of what tire pressures I should use. 
Using the Michelin charts, based on this info, I’m coming up with:

Fronts - 100 psi for the 365s 16520/8260 (100 psi single 8780)

Rears - 125 psi for each of the 315s (125 psi single 8690 or dual 15820) or (130 psi dual 16540)

If I’m reading this correctly I need to run the rears at 130...??? 

Slightly confused.... 

Thanks, JK


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Kristi & Jeff King
Bentonville, Arkansas
#744 2005 45’ Newell Coach 
ZF Suspension/Active Steering Tag Axle
CAT-13 ACERT KCB Engine 525HP 1642 ftlbs Torque Cat Compound Turbocharger 43.5 psi
Allison HD4000MH Transmission with PTO drive.
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#2

Were you towing a car at the time of the weight?

If the weight is really the front, drive and tag you have WAY too much weight on the drive axle and WAY too little weight on the tag. Your tag axle should have around 10,000 pounds on it which would greatly reduce the weight on your drive axle.

Michael Day
1992 Newell 43.5' #281
NewellOwner.com
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#3

The more weight you add to the tag, the more the front has to carry.

My biggest fear is a steer tire blowout, so I try to make sure my steer axle isn't overloaded.

1987 classic #159
8V92 MUI , Allison 740
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#4

"No individual scales available in my area"

FYI-Newell has individual wheel scales.

Steve Bare
1999 Newell 2 slide #531
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#5

The truck stop scales can be tricky. You have to find out which of the dividing lines on the platform dtermines drive from trailer. That line has to be between the drive and tag.

Richard and Rhonda Entrekin
99 Newell, 512
Maverick Hybrid Toad
Inverness, FL (when we're home Cool )
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#6

Looks to me like his drive weight included the tag and the 3000 figure was a trailer. In my 2001 I carried 110 all around.

2001 Newell #579
tow a Honda Odyssey
fun car: 1935 Mercedes 500K replica
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#7

Kristi & Jeff,

I am thinking that you are running the steer axle a little low. I run at 110-115 on my 365s. Even though the chart says 100....what if you develop a slow leak. You could drop into the danger zone pretty quickly. While I am not worried about blow out on any of the other tires....I am very concerned about the steer axle. So...I run a little more pressure than necessary (and therefore a little harsher ride) but I have more peace of mind.

For what its worth.

Bill

Ps. I agree with Chester’s thought. Mostly because your total weight looks reasonable.

Bill Johnson
Birmingham, Alabama
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#8

I will re-weigh the coach today paying close attention to positioning the coach on the different platforms.

At trip to Newell (1:45 mins away) will be on the list.

(12-03-2018, 06:32 AM)jdkskyking Wrote:  I will re-weigh the coach today paying close attention to positioning the coach on the different platforms.

At trip to Newell (1:45 mins away) will be on the list.

I’m also adding a TPMS from my Winnebago.

(12-01-2018, 10:24 AM)Fulltiming Wrote:  Were you towing a car at the time of the weight?

If the weight is really the front, drive and tag you have WAY too much weight on the drive axle and WAY too little weight on the tag. Your tag axle should have around 10,000 pounds on it which would greatly reduce the weight on your drive axle.

I must not have had the coach on the scales properly.

Kristi & Jeff King
Bentonville, Arkansas
#744 2005 45’ Newell Coach 
ZF Suspension/Active Steering Tag Axle
CAT-13 ACERT KCB Engine 525HP 1642 ftlbs Torque Cat Compound Turbocharger 43.5 psi
Allison HD4000MH Transmission with PTO drive.
Reply
#9

Newell gave me weighing numbers for 744 with full fuel and water.

Steer 8470/8390 = 16,860

Drive 11,440/11,350 = 22,790

Tag.   7440/7200 = 14,640

Total 54,290 

Tire pressures from Michelin: 

Steer 100psi 

Drive 85psi  ?? 

Tag 110psi 

Am I reading the chart correctly for the 315/80R 22.5 Dual ? 85psi for 11,680lbs.

Kristi & Jeff King
Bentonville, Arkansas
#744 2005 45’ Newell Coach 
ZF Suspension/Active Steering Tag Axle
CAT-13 ACERT KCB Engine 525HP 1642 ftlbs Torque Cat Compound Turbocharger 43.5 psi
Allison HD4000MH Transmission with PTO drive.
Reply
#10

I’ve got the following:
Steers @ 115psi
Drive/Tag @ 110psi

Kristi & Jeff King
Bentonville, Arkansas
#744 2005 45’ Newell Coach 
ZF Suspension/Active Steering Tag Axle
CAT-13 ACERT KCB Engine 525HP 1642 ftlbs Torque Cat Compound Turbocharger 43.5 psi
Allison HD4000MH Transmission with PTO drive.
Reply


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