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Air Pressure

Yahoo Message Number: 774
I'm a little late getting in on this topic, but I just worked out how to air up with my small air compressor. First, after getting the 4 point weight of the coach (2000 Magna) at Lazy Days last winter, the recommended pressure was 105 psi all around. (At purchase the original pressure was at 120 psi). Only about 8000 miles after lowering the pressure, the front tires had worn about 1/4 inch off the outer edges. We rotated the tires and after lots of discussions with many "experts" we have increased the pressures to 115 psi in front and 110 psi in the rear. 5000 miles later there seems to be no excessive tire wear and I believe the coach handles better and doesn't pull right on sloped Interstate Highways as it did at the lower pressures. It does feel the bumps more, but I think the trade-off is worth it.
Now to the problem of maintaining the correct pressure. At home I use a Campbell Hausfeld RP 4000, 110 volt AC, 150 psi compressor that costs less than $100. It is a low volume, high pressure compressor, that requires about 15 minutes to add 5 to 10 psi to a coach tire. You do not leave it unattended since it can go over the tire's maximum rating. I don't believe in valve extensions, so getting to the tire air valves with the clamp-on hose is impossible. To solve the problem, I use a temporary 8 inch long, solid extension for the front tires and the inside tire on the duals. For the outside tire on the duals I have a long flexible extension (actually 2 screwed together) that I taped to a piece of heavy, flexible wire and shaped into a "C" so that it attaches to the tire valve and the end comes out the next wheel hole. So far the little compressor has performed well. It doesn't get hot with extended use and the air gauge is accurate within 2 or 3 psi. And it sure beats trying to air up at a truck stop with an 18-wheeler in line behind you.

Tom B.

Air Pressure

Reply #1 –
Yahoo Message Number: 54461
Looking for some sage advice regarding the air system. I haven't pulled the book to seek counsel of the written word but today when moving our MH from storage I noticed the air pressure fluctuated greatly and don't recall that ever happening in the past.
The pressure, reflected by the lower needle, dropped from 120 to as low as 90 and then returned to match the stationary needle at 120. Later I noticed it again dropped and remained at around 90 for a while before returning.
Wondered if this suggested a filter or compressor issue or is more normal than problematic.

Will appreciate those with the experience responding.
Gerry Brown

'07 Allure 31447

Re: Air Pressure

Reply #2 –
Yahoo Message Number: 54462
90 to 120 is the normal pressure the compressor governor is set to maintain. Gov. kicks out at 120 and you should hear you air dryer dump a little air. The governor starts the compressor at a low of 90. Sounds normal.

Leonard

97 Magna 5418

Re: Air Pressure

Reply #3 –
Yahoo Message Number: 54464
at what RPM did this happen? it is normal to drop to 90 psi b4 pumping back to 120 . do you hear any air leaks, does it hold 90 psi with the engine shut off? bob '02 magna 6028

Re: Air Pressure

Reply #4 –
Yahoo Message Number: 54465
I'll have to check when I have it out next. Didn't hear any leaks, air bags held up fine for three months. RPM were very low, just driving slowly in residential area. Came back to 120 and held, I just didn't recall the needle ever varying previously or not this much.
Gerry Brown

Re: Air Pressure

Reply #5 –
Yahoo Message Number: 54468

I find it normal when driving the coach and using the brakes. Barrie Boas 94 Concept 5111

Re: Air Pressure

Reply #6 –
Yahoo Message Number: 54469
you should be good to go , bob6028 --- On Thu, 12/3/09, GBrown4447@... wrote:From: GBrown4447@... Subject: Re: [Country-Coach-Owners] Air PressureTo: Country-Coach-Owners@yahoogroups.comDate: Thursday, December 3, 2009, 7:39 PM

I'll have to check when I have it out next. Didn't hear any leaks, air bags held up fine for three months. RPM were very low, just driving slowly in residential area. Came back to 120 and held, I just didn't recall the needle ever varying previously or not this much.
Gerry Brown7 Allure 31447

In a message dated 12/3/2009 4:28:25 P.M. Pacific Standard Time, my47hudsons@ yahoo.com writes:

at what RPM did this happen? it is normal to drop to 90 psi b4 pumping back to 120 . do you hear any air leaks, does it hold 90 psi with the engine shut off? bob '02 magna 6028 --- On Thu, 12/3/09, GBrown4447@aol. com wrote:
From:

GBrown4447@aol. com Subject:

[Country-Coach- Owners] Air PressureTo: Country-Coach- Owners@yahoogrou ps.comDate: Thursday, December 3, 2009, 6:09 PM

Looking for some sage advice regarding the air system. I haven't pulled the book to seek counsel of the written word but today when moving our MH from storage I noticed the air pressure fluctuated greatly and don't recall that ever happening in the past.

The pressure, reflected by the lower needle, dropped from 120 to as low as 90 and then returned to match the stationary needle at 120. Later I noticed it again dropped and remained at around 90 for a while before returning.

Wondered if this suggested a filter or compressor issue or is more normal than problematic.

Will appreciate those with the experience responding.
Gerry Brown

'07 Allure 31447
 

Re: Air Pressure

Reply #7 –
Yahoo Message Number: 54475
My initial thoughts were:
1. There might be a problem
with the primary compressor
2. An air filter may have

been overlooked in servicing and not allowing full air passage
3. A regulator may have
become defective
4. A leak in the brake

system

Your encouragement is appreciated. This is a little like flying at night over rough terrain in a single engine plane where any unexpected noise, movement or needle deflection further strains your nerves. Thanks for all your reassurement.
G Brown



you should be good to go , bob6028--- On Thu, 12/3/09, GBrown4447@aol. com
wrote:
From:

GBrown4447@aol. com Subject:

Re: [Country-Coach- Owners] Air PressureTo: Country-Coach- Owners@yahoogrou ps.comDate: Thursday, December 3, 2009, 7:39 PM

I'll have to check when I have it out next. Didn't hear any leaks, air bags held up fine for three months. RPM were very low, just driving slowly in residential area. Came back to 120 and held, I just didn't recall the needle ever varying previously or not this much.

Gerry Brown7 Allure 31447

In a message dated 12/3/2009 4:28:25 P.M. Pacific Standard Time, my47hudsons@ yahoo.com writes:

at what RPM did this happen? it is normal to drop to 90 psi b4 pumping back to 120 . do you hear any air leaks, does it hold 90 psi with the engine shut off? bob '02 magna 6028 --- On Thu, 12/3/09, GBrown4447@aol. com
wrote:
From:

GBrown4447@aol. com Subject:

[Country-Coach- Owners] Air PressureTo: Country-Coach- Owners@yahoogrou ps.comDate: Thursday, December 3, 2009, 6:09 PM

Looking for some sage advice regarding the air system. I haven't pulled the book to seek counsel of the written word but today when moving our MH from storage I noticed the air pressure fluctuated greatly and don't recall that ever happening in the past.

The pressure, reflected by the lower needle, dropped from 120 to as low as 90 and then returned to match the stationary needle at 120. Later I noticed it again dropped and remained at around 90 for a while before returning.

Wondered if this suggested a filter or compressor issue or is more normal than problematic.

Will appreciate those with the experience responding.
Gerry Brown

'07 Allure 31447