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-   -   Pumping up tires (https://www.irv2.com/forums/f115/pumping-up-tires-160364.html)

SteveSkinner 05-06-2013 08:00 PM

Pumping up tires
 
I purchased a 50 ft pressure hose to pump up the tires ( if required)
On the rear of the Motorhome next to the draw bar is a single female air fitting.
I plugged the hose into it but it seems to be not charged.
I assumed it was fitted directly to an air tank. Wrong I guess.
Question: what would this have been used for, it's obviously part of a breaking system, but what sort?
I suspect it would charge if I let off the park brake, but I would have to chock the coach to pump the tires ( or run really fast)
Any ideas?

Craig_R 05-06-2013 08:32 PM

Steve, it may very well be for a supplemental braking system such as the M&G Engineering or SMI Air Force 1 systems.

Releasing the parking brake will not charge it. Air pressure to that fitting is only supplied when the parking brake is released and the foot brake is applied.

There should be another female fitting somewhere on the coach that will be designed as an air supply. Mine is located in the same compartment as the batteries along with 4 air drain cocks. I don't know where yours would be on your Signature. I have heard of them being located up front in the electrical bay. You may have to do some searching to find it.

Mr_D 05-06-2013 08:51 PM

Quote:

Originally Posted by Craig_R (Post 1558549)
Air pressure to that fitting is only supplied when the parking brake is released and the foot brake is applied.

Parking brake applied or released wouldn't matter, only if the service brakes are applied.
Late model RV's are not harmed by having the parking brake set and pressing on the service brake peddle. They now have double acting diaphragms which allow for that.

Barlow46 05-06-2013 09:06 PM

Look in your bay where your propane tank is located on driver side. Also, check the generator slide out compartment but realize there is also a fitting there for a tow truck hook air up to the system if needed.

SteveSkinner 05-06-2013 09:12 PM

Thanks gents

I'll look first up in the morning
I'm glad the manufacturers provide one
Just a matter if finding it
I've aired up at a Pilot before but it was a pita.
Much rather do it at my leasure.

Mike Canter 05-07-2013 06:10 AM

Steve, my air fitting is in the forward most compartment on the drivers side in the upper left corner (forward). It has a blue plastic cap over it. I bet yours is there also

TheJeep 05-07-2013 07:13 AM

On ours it's in the propane/fuel compartment drivers side top left corner.

bgholson 05-07-2013 09:02 AM

I have one in the generator compartment but the manual says use the one in the propane compartment for supplemental air. To date have not used either.....guess I should just to see if works!

MSHappyCampers 05-07-2013 09:19 AM

Quote:

Originally Posted by TheJeep (Post 1558911)
On ours it's in the propane/fuel compartment drivers side top left corner.


That's where mine is too! :thumb::D

Mike Canter 05-07-2013 09:23 AM

My guess is that the one in the generator compartment is for the tow truck to hook up to so your air bag system is functional while towing. For tires you would want the one labeled supplemental air l

Dogcliff 05-07-2013 11:20 AM

Found mine in the propane bay. It was quite stiff; I removed the fitting, oiled it up...works great. Perhaps an engine bay mounted air hose reel in my future.

DC 03 Sig

SteveSkinner 05-07-2013 12:12 PM

Quote:

Originally Posted by Mike Canter (Post 1558875)
Steve, my air fitting is in the forward most compartment on the drivers side in the upper left corner (forward). It has a blue plastic cap over it. I bet yours is there also

Aired up my tires this morning
I used the fitting with the blue cap in the forward most compartment on the drivers side
Worked like a ripper.
Now it was 40 degrees and 6000 ft when I aired them up should I make some allowances.
Don't answer that it was a joke.
Had/ put 105 in the steer 315's 100 in drive and 90 in tag 295/80's
My steer is lighter than Steve Owenby's at 14128
With 33760 over rear combination.
( the rear combination may include the tow car or it may not. It was on a separate compartment on the scale but as I was speaking Australian and she American I never got a clear understanding of the aforementioned )
Thanks for everybody's input

Burgy 05-07-2013 12:15 PM

What gets me is they could have put one on both sides for less than 20 bucks..

This will be an upcoming mod

RVNeophytes2 05-07-2013 12:40 PM

From Oz, Under Pressure
 
Quote:

Originally Posted by SteveSkinner (Post 1559184)
Had/ put 105 in the steer 315's 100 in drive and 90 in tag 295/80's
My steer is lighter than Steve Owenby's at 14128
With 33760 over rear combination.

Steve, we are a global bunch: I'm penning you a quick note from Tokyo, wee hours.
:greetings10:

'Glad you found the carefully concealed blue-capped hookup, suggest using two hands and safety glasses; that thing is going to cost someone an eye, one day.

My weights are nearly identical to yours. 'Got XZE Michelins on the steers and soon-to-be-replaced Goodyears on the drive/tag. The book called for 115 up front, about 105 in the drives, and less than 95 on the tag.

Just the other day, I opted to put extra in the rear to see if the ride and mileage improve. To stay organized mentally, I descended in pressure from 115 up front, 110 in the drives, 100 on the tag. No change in ride, nominal change in the contact patch where it matters least, and (initially) a whopping 20% rise in mileage.

This comes on the heels of being the laughing stock of our circle of 500-ish hp rig owners when it comes to diesel consumption. I mean, my buddies are driving like demons compared to my grandma pace, kicking my arse at the pump. The one constant I noticed is that my inflation values aft of the steers are much lower than theirs. Even the tire shop guys remarked that the pressures seemed low, but I doggedly adhered to the Michelin tables.

If my theory is correct, I'll have good traction, safe summer running temps, smooth ride, and be a rock star at the fueling island. Let the test begin...


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