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Old 02-08-2016, 01:29 PM   #1
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130 PSI Blues - Can't get there from here

Have 2016DS4313 and do have 9K# on front axles. Tried to use my 150 PSI home compressor and won't get to 130 even with long wait. Advised by Newmar that onboard will not get it done so went to Flying J.

First, once at "J", realized tires were no longer cold so not sure as to what pressure I would need and realized if I checked cold and than (say at 120 cold) added 10 to whatever pressure I had at "J", might be good but not sure. Of course, in that case, I am now trying to air to some higher number like 150 or wait for tires to cool? (Not sure how long that takes?)

Unfortunately, both front tires ended up losing pressure at the air fill at J and the only suggestion the manager had, was try another bay, did so with no luck. While I figured a truck stop would have plenty of pressure for big rigs, now realize if they are running 24 " rims, they might not need 130 so I am chasing my tail trying to get to what I understand is critcial pressure given my weight.

Any advice or tips greatly appreciated.
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Old 02-08-2016, 01:37 PM   #2
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Here is the perfect compressor for your RV Robot Check.

I've owned mine for over 7 years. I store it in a pillow case in one of my bays. It's 120 volt, so you can plug it in at home or on the road. It has a locking chuck, so you just snap it on. It also has a gauge which is fairly accurate that reads as it's filling.

I timed my once and it took about 11 seconds to add a pound of air. Since you'll only be topping tires off it works well. If you do a search, many recommend this compressor. It's small and lightweight. Hunt around for the best price, others have found it cheaper than Amazon.
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Old 02-08-2016, 01:57 PM   #3
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My first question would be why on earth are you needing 130 lbs in each of your front tires when you only have a 9000 lb axle?

I have a 13,000 lb axle and my front Michelin 295/80R/22.5 tires only require 100 lb's but I use 105 lb's which gives me a 5 lb safety factor.

Also, did you check to see what the maximum psi that your wheel can handle?

My Accuride wheels have a 120 lb maximum even though the tire itself can handle 125 lb's psi max.

Plus keep in mind that moisture inside a tire will accelerate the decomposition of a tire. Whatever compressor you use make sure it has a dryer on the output to capture any moisture in the compressed air.

Dr4Film ----- Richard
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Old 02-08-2016, 02:32 PM   #4
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I'm with the DR...me thinks you may be misjudging your need....

I have 12,040 or so on my front axle (I only have one front axle, not axles like yours ), so that's 6,020 per TIRE I need - and my goodyears call for about 100 psi for those weights...

and as far as hot tires ?
I do that MANY times when leaving the campground...
if they are 15 psi low when cold, when I get to the pump, I just put 15 psi more than it reads then - NOT perfect as the sunny side will be higher, etc.... but better than not knowing
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Old 02-08-2016, 02:32 PM   #5
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We had a '02 DSDP 4090 with over 13,000 on the front axle. That required 130 psi in the OEM 275/70 tires, but the wheels would only take 120 psi. Newmar had Spartan replace the 12,000# front axle with a 14,600# unit. Later I changed the tires to 305/70's in the front, then I dropped down to 110 psi (105 required + 5).
9000 on the front axle of a 43' DSDP is way too LOW!! Is that the front axle divided by 2? Is so then it's way too high.
Our Magna is much heavier than a DSDP and we have 18,030 on it's 20,000# front axle.
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Old 02-08-2016, 02:37 PM   #6
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He has a 2016 DSDP 43'. Obviously more than a 9000lb front axle !

What I dont get, is why your 150psi compressor cant put 130psi in your tires .
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Old 02-08-2016, 02:39 PM   #7
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We use a Power Tank to fill our tires. The regulator can be set to over 170 psi and it is silent. Our 10 lb tank of CO2 lasts a little over a year with topping off the truck and trailer tires.
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Old 02-08-2016, 02:39 PM   #8
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Northern Tool has a 3 gallon 155 pound capacity for about $75.00. I store it in a door with a 50 ft hose. Works good. Eddie Elk.
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Old 02-08-2016, 02:51 PM   #9
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Quote:
Originally Posted by cmacbroom View Post
Have 2016DS4313 and do have 9K# on front axles. Tried to use my 150 PSI home compressor and won't get to 130 even with long wait. Advised by Newmar that onboard will not get it done so went to Flying J.



First, once at "J", realized tires were no longer cold so not sure as to what pressure I would need and realized if I checked cold and than (say at 120 cold) added 10 to whatever pressure I had at "J", might be good but not sure. Of course, in that case, I am now trying to air to some higher number like 150 or wait for tires to cool? (Not sure how long that takes?)



Unfortunately, both front tires ended up losing pressure at the air fill at J and the only suggestion the manager had, was try another bay, did so with no luck. While I figured a truck stop would have plenty of pressure for big rigs, now realize if they are running 24 " rims, they might not need 130 so I am chasing my tail trying to get to what I understand is critcial pressure given my weight.



Any advice or tips greatly appreciated.

I think you misspoke about the weight on your front axle. You have a 17k steer axle so 9k pounds doesn't compute. If you have 315/80 tires on 9" wheels. 130 psi in those tires should support about 9k per tire.
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Old 02-08-2016, 03:03 PM   #10
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Did'nt they recently switch to a 18,000lb axle on that coach?
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Old 02-08-2016, 03:09 PM   #11
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Quote:
Originally Posted by Dale & Mark Bruss View Post
We use a Power Tank to fill our tires. The regulator can be set to over 170 psi and it is silent. Our 10 lb tank of CO2 lasts a little over a year with topping off the truck and trailer tires.
Same here. I originally got the Power Tank for my Jeep, but it's perfect for the RV's tires too. The downside of course is that it is a finite source of inflation air, but there is no shortage of gas & welding supply shops nation-wide for refills. And like you, I only need a refill about once a year. I actually stopped using the Power Tank cylinder and currently do cylinder exchanges at AirGas and just use the Power Tank regulator.
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Old 02-08-2016, 03:15 PM   #12
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Well with only a few posts from this OP he is fairly new at posting so we must cut him some slack on the information that he supplied in this thread.

Maybe he'll come back and clarify exactly what he has and needs.

Dr4Film ----- Richard
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Old 02-08-2016, 03:28 PM   #13
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Got a Porter Cable 150 lb pancake compressor from Home Depot. Came with 3 air nailers (brad, staple, nail). Under 100 dollars.

OP probably means 9000 per side at which weight the DS will need 130 lbs.
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Old 02-08-2016, 03:42 PM   #14
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In addition to the recommendation of DS Don, another to consider is this one from Viair. It is made (or marketed) specifically for RV's. I've had mine for about 3 years and can report that it works well and quickly. It is 12V and you connect it directly to your chassis or house batteries when needed.

http://amzn.com/B004B68XGC
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