2007 Discovery 39S Air Compressor

[mgosselin]

I was told that my unit has an air compressor that I can tap into when I need to add a little air to my tires. Does anyone know where this is located? I purchased this unit from Fleetwood Riverside directly about 3 years ago and did not get a lot of direction on items like this. I found paperwork that said it had a 13.2 CFM air compressor.

Thanks

[bosshawg]

I have a Discovery 39c and the quick connect is under my hood in the front. Yours is probably there also. It is a quick connect fitting

[mgosselin]

Quote:

Originally Posted by bosshawg I have a Discovery 39c and the quick connect is under my hood in the front. Yours is probably there also. It is a quick connect fitting

Thanks, I found it today. Have you used yours? Could you get 130psi from it? From what I have read the last two days sounds like people are only getting 90 out of it. Just trying to see if I need to buy a small compressor.

[bob109]

Quote:

Originally Posted by mgosselin Thanks, I found it today. Have you used yours? Could you get 130psi from it? From what I have read the last two days sounds like people are only getting 90 out of it. Just trying to see if I need to buy a small compressor.

Unfortunately your on-board compressor will not deliver pressure in the 100/120 psi range. I, like many other RV owners have opted to purchase a Sears 150 psi compressor for topping our tires. Here's the info on the compressor.
Sears: Online department store featuring appliances, tools, fitness equipment and more
I've used this unit several times and it does a great job inflating my fronts to 110 psi and rears to 115psi.

[Triker56]

My on-board compressor has no problem to get tires up to 115 PSI.
To get above the 100 plus mark the compressor needs to be running.
So at times I have to let air out of the line so it will kick it back on.
Or if you have another person with you. They can hit the brake pedal a few times to do the same thing.

Tires can hit the 115 right before the spiter valve kicks off around the 120 range.

[bosshawg]

Quote:

Originally Posted by bob109 Unfortunately your on-board compressor will not deliver pressure in the 100/120 psi range. I, like many other RV owners have opted to purchase a Sears 150 psi compressor for topping our tires. Here's the info on the compressor. Sears: Online department store featuring appliances, tools, fitness equipment and more I've used this unit several times and it does a great job inflating my fronts to 110 psi and rears to 115psi.

Is that what we should run in our tires?

[Catch and Release]

Quote:

Originally Posted by bosshawg Is that what we should run in our tires?

You need to weigh your coach and then use the tire mfg's chart for the specific tire you have on your coach to determine the air pressure you need to have in your tires. Don't forget to apply a 10-15% cushion to account for additional weight from fuel, water, etc. that was different from the time you weighed the coach.

FYI, I have a 2007 Fleetwood Excursion on a Freightliner chassis and my air pressures come out at 85psi. Much smoother ride than 115psi.

[bob109]

Quote:

Originally Posted by bosshawg Is that what we should run in our tires?

As has been mentioned, the right tire pressure for your M/H is achieved by having the unit weighed and adjusting the pressure accordingly. The ideal situation is to have all four corners weighed. Although unlikely, it's possible to have four different pressure settings. Usually the two front tires are the same. The rears will likely have a higher setting. One thing to remember with your tire pressure. Under-inflating generates heat which ultimately can destroy a tire. I use a laser thermometer to monitor my tires and trailer axle bearings while traveling. Tire temps are a good indicator of running the right pressure. Remember to make any adjustments to pressure when the tires are cold

Here's info on the Laser Thermometer!
http://www.harborfreight.com/non-con...ter-96451.html

[Elkhartjim]

[QUOTE=bob109;903146...it's possible to have four different pressure settings. Usually the two front tires are the same. The rears will likely have a higher setting.[/QUOTE]

Maybe I misunderstood but if you are saying run different pressures on the same axle I would suggest checking with your tire manufacturer. According to both the Michelin and Goodyear literature available on line, "never run different pressures on the same axle". Set the pressures for the heaviest corner with a safety factor for each axle. In my experience, the rears usually carry 5-10 pounds less in pressure. Four tires versus two on the front.

And just so I don't totally hijack the thread, as others have said the connections will be under the front hood on the curbside. The air line suppling air for the horns will also come off this same connection.

[bob109]

Quote:

Originally Posted by Elkhartjim Maybe I misunderstood but if you are saying run different pressures on the same axle I would suggest checking with your tire manufacturer. According to both the Michelin and Goodyear literature available on line, "never run different pressures on the same axle". Set the pressures for the heaviest corner with a safety factor for each axle. In my experience, the rears usually carry 5-10 pounds less in pressure. Four tires versus two on the front. And just so I don't totally hijack the thread, as others have said the connections will be under the front hood on the curbside. The air line suppling air for the horns will also come off this same connection.

Weighing the four corners gives you sufficient data to adjust the added weights, i.e. tools, air compressors etc., stored in your MH . You can relocate those items to opposite sides of your coach to bring the corner weights close. If you tow a trailer which has substantial tounge weight your rear tire pressure may be, in fact, higher than your front axle pressure. A TOAD with tow bar adds almost zero tounge weight. The same applies to a tow dolly. No two MH's are identical when it comes to weight distribution hence weighing your unit and adjusting the tires to the proper pressure is paramount to good tire wear/ride/safety!

[Elkhartjim]

Quote:

Originally Posted by bob109 Weighing the four corners gives you sufficient data to adjust the added weights, i.e. tools, air compressors etc., stored in your MH . You can relocate those items to opposite sides of your coach to bring the corner weights close. If you tow a trailer which has substantial tounge weight your rear tire pressure may be, in fact, higher than your front axle pressure. A TOAD with tow bar adds almost zero tounge weight. The same applies to a tow dolly. No two MH's are identical when it comes to weight distribution hence weighing your unit and adjusting the tires to the proper pressure is paramount to good tire wear/ride/safety!

I agree...I just didn't want anyone to get the idea that its okay to have 80# in the right front tire and 95# in the left front tire.

[bob109]

Quote:

Originally Posted by Elkhartjim I agree...I just didn't want anyone to get the idea that its okay to have 80# in the right front tire and 95# in the left front tire.

I agree 100%