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Old 05-29-2014, 07:35 AM   #1
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Axle Loads: 2000 NM DSDP 3859?

I am picking up my 2000 NM DSDP3859 this coming Monday. NM factory decal puts front axle GAWR at 10400 and rear at 17000. I have a new TST 507 TPM and have set sensors to correct tire specs for these axle loads. Can anyone give me any actual weighed corner numbers on a similiar coach? At first shot are the factory axle loads close enough till I get corners done? Thanks. Ed
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Old 05-29-2014, 08:37 AM   #2
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The tire pressures on the sticker with tire pressures will be OK until you get your coach loaded with items you will use and when done have coach weight to readjust the tire pressures according to the Michelin tire tables.
Here is a Brochure & Owners Guide with load instructions in it.
In my signature below are QT's links to many other items related to your Newmar.
Good luck and welcome to the Newmar family.
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Old 05-29-2014, 01:28 PM   #3
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I'm assuming you have a Spartan chassis. I have a 2000 DSDP model 3858 on a Spartan chassis. The only difference between a 3858 and a 3859 is you have a bedroom slideout. The 3858 does not. Theoretically because of the bedroom slide being behind your rear axle, (on the overhang) your rear axle should weigh a little more than mine, and your front axle should weigh a little less, since weight on the overhang lifts weight off the front.

I've weighed mine on two different trips, fully loaded for 4 months travel. Full fuel, full water, full propane, full basement. Both holding tanks empty. First trip weights were front axle 10,620, rear axle 17,080.
Second trip weights were front axle 10,880, rear axle 17,200.
I've never weighed the corners separately.

Are you sure you have a 10,400# front axle? Mine has a 12,000#. The tag in the cab said mine was a 10,400 front and 17,000 rear. Then another tag was attached to the side wall under the original stating it is a 12,000# front and a 17,000# rear with a GVWR of 29,000#. There's a tag on the front of the axle that will tell you what it is. You would have to get underneath and wipe the dirt off to see what it says. It's possible you have a 12,000# also. But even if yours is a 10,400# you should be OK.

The rear axle is rated at 17,000#, but I've read on several posts that it's actually a 19,000# axle (per a tech at Spartan). The same as was put on Mountain Aire's that year. Newmar de-rated it so as to make the Mountain Aire look like it could carry more weight.

Hope this helps until you can actually weigh yours.
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Old 06-02-2014, 04:38 AM   #4
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Excellent information. Michelin sets the fronts at 95psi and rears at 85psi based on my listed axle loads. I will check tag on front axle this afternoon - with all that said - what brand, tire spec and pressure do you set your front and rears? Thank you. Ed
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Old 06-02-2014, 06:42 AM   #5
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Quote:
Originally Posted by edaa53 View Post
Excellent information. Michelin sets the fronts at 95psi and rears at 85psi based on my listed axle loads. I will check tag on front axle this afternoon - with all that said - what brand, tire spec and pressure do you set your front and rears? Thank you. Ed

With those Michelen quotes, what size tires are you running? Mine are XZA3's 275/80R 22.5. I've been running 110psi. for 4yrs. of fulltiming on a similiar coach. I was told at a heavy truck repair place I should be running 120psi., but I thought that was too high. 110psi. has served me well.
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Old 06-02-2014, 07:04 AM   #6
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Quote:
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With those Michelen quotes, what size tires are you running? Mine are XZA3's 275/80R 22.5. I've been running 110psi. for 4yrs. of fulltiming on a similiar coach. I was told at a heavy truck repair place I should be running 120psi., but I thought that was too high. 110psi. has served me well.

Setting the air pressure in your tires is not something you should do without facts. The tires on the steer axle of your coach at 110 psi will support a load of approx 13,000 pounds. If you have weighed your coach then you know if you are at the correct pressure. If you have not weighed your coach then look at the placard on the side wall close to the drivers seat. That will list the GAWR of your coach. Inflate the tires to carry that much weight.

Here is the Michelin guide:

https://www.michelinb2b.com/wps/b2bc...s_Brochure.pdf


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Old 06-03-2014, 12:41 AM   #7
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Excellent information. Michelin sets the fronts at 95psi and rears at 85psi based on my listed axle loads. I will check tag on front axle this afternoon - with all that said - what brand, tire spec and pressure do you set your front and rears? Thank you. Ed
I'm running Goodyear G169's @ 100 PSI all the way around. Tire size is 275/70R 22.5.
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Old 06-07-2014, 08:00 AM   #8
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The Sumitomo load chart for the 275/75/22.5's set my fronts at 95psi and rears at 85psi based on axles loads from Sparten/Newmar. The tire dealer SOS in Garden City said pressure should be 100psi all around. Tires currently at 100psi. So - go w/ manufacturer or dealer? Lighter psi yield softer ride but with more tire flex - more heat generation? Tire pressure monitor showed tires at 113psi on the road. Ed
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Old 06-07-2014, 08:42 AM   #9
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The Sumitomo load chart for the 275/75/22.5's set my fronts at 95psi and rears at 85psi based on axles loads from Sparten/Newmar. The tire dealer SOS in Garden City said pressure should be 100psi all around. Tires currently at 100psi. So - go w/ manufacturer or dealer? Lighter psi yield softer ride but with more tire flex - more heat generation? Tire pressure monitor showed tires at 113psi on the road. Ed

Ask the tire dealer for the basis for their recommendation. If you have not weighed your coach then inflating the tires to carry each GAWR is a sound plan. 95-100 should be fine in the steer tires and 85-90 in the drive tires. It would do no harm to go with 100 all the way around. The tires charts give the minimum pressure to carry that particular load. Your traveling psi will be up to 20% higher than the cold pressure.


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