Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 11-03-2014, 08:32 AM   #1
Senior Member
 
DebnDan's Avatar
 
Nor'easters Club
Fleetwood Owners Club
Freightliner Owners Club
Join Date: Mar 2011
Location: North Jersey
Posts: 229
AIR Leak - HELP!

Thankfully my brakes locked up in driveway after 800 mile trip. Air pressure would not build up. Air is gushing out of the valve in the first photo. The second photo is the canister this valve is attached to. I assume this "canister" is part of the air compressor... or is it the dryer I keep reading about? Have had 5 gassers before this DP which I purchased a few months ago - there is a learning curve going from gas to diesel. At any rate I assume I can go to a Cummins dealer and purchase this valve and replace it. Any info from this group would be most appreciated. Right now I am parked in the driveway with locked brakes. Thanks in advance for any of your help.

Dan Callahan
2008 FW Excursion
2007 Freightliner, 360 Cummins and Allison
Attached Thumbnails
Click image for larger version

Name:	IMG_2343.jpg
Views:	234
Size:	258.6 KB
ID:	78137   Click image for larger version

Name:	IMG_2344.jpg
Views:	231
Size:	289.1 KB
ID:	78138  

__________________

__________________
DebnDan is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 11-03-2014, 09:32 AM   #2
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,085
It's not really a Cummins part, but most any Cummins Coach Care facility could fix it. Or most any heavy truck shop. The air system is part of the chassis, so its a Freightliner component, though they undoubtedly sourced it from one of the major truck component suppliers.

That looks like an air dryer cartridge but could be part of the air pressure regulator too. The valve itself may be simply doing its job, as a result of some other failure. Maybe a clogged air dryer (no air gets through). Has the air dryer ever been serviced? A 2008 should have had the cartridge changed at least twice (usually a 36 month interval on late model DP's).
__________________

__________________
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 11-03-2014, 09:46 AM   #3
Senior Member
 
jergeod's Avatar
 
Join Date: Aug 2013
Location: Upstate New York
Posts: 328
The second photo is your air drier, you can replace the valve but if you haven't been draining your air tanks on a regular basis the inside of the drier is fill of gunk and a new valve won't last long. I myself would replace the drier with a new one, drain air tanks then drain tanks once a week while in use. If unit has been stored, when you get it out run the air up then drain the tanks, condensation will build up while sitting. If you have alot of oil blowing out the drier or the tank valves when dumping now you need to look at the air compressor because that is where the oil would be coming from.
__________________
George & Jerri
06 GT 340TSSE
USMC VET.
jergeod is offline   Reply With Quote
Old 11-03-2014, 01:45 PM   #4
Senior Member
 
DebnDan's Avatar
 
Nor'easters Club
Fleetwood Owners Club
Freightliner Owners Club
Join Date: Mar 2011
Location: North Jersey
Posts: 229
I have owned the coach for 4 months. Based on it's condition I assume it was maintained, however I doubt there are many people crawling underneath and draining their tanks. I will get under and try and locate the tanks this evening. I think what you guys are saying is take the tank apart, clean it and the fittings up and then replace drying cartridge. If there is still a problem I should have a mechanic look at it. Correct?
__________________
DebnDan is offline   Reply With Quote
Old 11-03-2014, 01:59 PM   #5
Senior Member
 
no3putt's Avatar
 
Join Date: Apr 2012
Location: Pueblo, CO
Posts: 516
on our Freightliner Chassis by the behind front wheels, there are three lanyards to pull, two on one side and 1 on the other. to drain the air tanks, pull the lanyards and when tanks have air you will hear air come out.
__________________
2009 Berkshire 390 QS and toad
Retired and traveling
no3putt is offline   Reply With Quote
Old 11-03-2014, 02:06 PM   #6
Senior Member
 
Join Date: Apr 2003
Location: Rochester, MN, USA
Posts: 347
Dan - your approach is what I would do also. When they speak of emptying the tanks (especially after your valve stuck) there should be some cable lanyards connected to each of your air tanks. Pull on them and the tanks should purge. Watch to see if any moisture comes out which could indicate other problems.

Have a nice day - Darrel
__________________
2007 3912 KSDP w/350HP ISL Cummins
2003 Grand Cherokee toad w/M&G Brake
Darrel is offline   Reply With Quote
Old 11-03-2014, 02:41 PM   #7
Senior Member
 
Join Date: Jul 2014
Posts: 9,909
The part that is leaking is the Air Dryer safety valve, used to protect from over-pressure. You need to find out why it blew.

The air dryer is installed to eliminate the need to drain your air tanks often. It is still good practice to drain all of your tanks a few times a year.

The order of components is "Engine mounted Compressor", "Air Dryer", "Wet tank" and then 1 or 2 "Dry tanks". Sometimes 1 of the tanks is a dual tank, so it would have 2 drains.

The line from the Air Dryer goes to the wet tank fitting, that has a check valve in it, to hold the air in the system, when the compressor stops pumping.

From the wet tank, there is a small line that runs back to the governor, that is mounted on the compressor. If that line is leaking, the compressor will not stop pumping, causing the safety fuse to blow.
There is also a small line from the governor to the Air Dryer, that sends a signal to the air dryer to open the un-loader valve, whenever the set pressure is reached. If that line is leaking the compressor will cycle often, with the air dryer un-loading every few minutes.
Another reason for an Air Dryer cycling, is a leaking wet tank check valve. As the wet tank air leaks back thru the Air Dryer exhaust, the pressure drops and re-starts the compressor.

The pressure gauges you see in the cab are hooked to the 2 dry tanks, so, even though the pressure looks normal, the wet tank could be leaking because there are other check valves to protect your air supply when something goes bad.

Hope this helps
__________________
twinboat is online now   Reply With Quote
Old 11-03-2014, 03:00 PM   #8
"Formerly Diplomat Don"
 
Dutch Star Don's Avatar
 
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 9,306
"twinboat".....nice/helpful description of system in easy to understand terms.
__________________
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
Dutch Star Don is offline   Reply With Quote
Old 11-03-2014, 08:19 PM   #9
Senior Member
 
Tiffin Owners Club
Join Date: Oct 2010
Posts: 267
Replace the entire drier unit. It can be done in your driveway by a Mobil truck tech who knows his stuff. Call Freightliner in Gaffney SC with your VIN number handy and they can give you the correct p/n for your coach. The big unit should be replaced every 5 years, filter in the unit is changed on a 2 year cycle.

I had this failure in Upper MI 3 years ago, got it fixed on site in an hour. Part came overnite, but you may have one available in your area. As I recall, it was about $300 for the unit (Haldex).

Good luck, it's easier than you may think.
__________________
Larrikin is offline   Reply With Quote
Old 11-04-2014, 07:18 AM   #10
Senior Member
 
Coma's Avatar
 
Monaco Owners Club
Join Date: Nov 2010
Location: The Emerald Coast
Posts: 1,757
Haldex pure air. Two service kits upper and lower. The overpressure valve should not be operating that way. It may be clogged with the coalescent effluent.
__________________
Jim and Jennie, Cats=Bittles and Potter, 2000 Dynasty 350 ISC
2013 Silverado 4x4 Towed with R1200GS in bed.
PROV23:4 Do not wear yourself out to get rich; have the wisdom to show restraint.
Coma is offline   Reply With Quote
Old 11-04-2014, 11:10 AM   #11
Senior Member
 
DebnDan's Avatar
 
Nor'easters Club
Fleetwood Owners Club
Freightliner Owners Club
Join Date: Mar 2011
Location: North Jersey
Posts: 229
Thanks everyone.... I found the 3 valves and emptied the tanks, no moisture to speak of. Is it necessary to take the whole dryer unit off to change the cartridge. I think I want to try that first. I assume the cartridge is dropped in from the top. But maybe I should take the whole unit off the coach to see if it needs cleaning or do as Larrikin suggests, just replace the whole thing.
__________________
DebnDan is offline   Reply With Quote
Old 11-04-2014, 11:12 AM   #12
Senior Member
 
DebnDan's Avatar
 
Nor'easters Club
Fleetwood Owners Club
Freightliner Owners Club
Join Date: Mar 2011
Location: North Jersey
Posts: 229
BTW, I am not trying to be a pest or cheap, I really want to learn all about the air system. Coming from gassers this is all new to me.
__________________
DebnDan is offline   Reply With Quote
Old 11-04-2014, 01:08 PM   #13
Senior Member
 
Join Date: Jul 2014
Posts: 9,909
Get a fitting to connect the 2 bigger hoses together and plug the small one.

Start the engine and watch the air gauges. If they climb, make sure they stop before they get to 130 pounds. If they keep climbing you have other problems. If they stop and hold 120 pounds, there is a blockage in the dryer.

You don't NEED an air dryer. You can jump it out of the system, just remember to drain your air tanks often, until you put one on.

Hope this helps
__________________
twinboat is online now   Reply With Quote
Old 11-04-2014, 03:57 PM   #14
Senior Member
 
DebnDan's Avatar
 
Nor'easters Club
Fleetwood Owners Club
Freightliner Owners Club
Join Date: Mar 2011
Location: North Jersey
Posts: 229
Good news... I bypassed the dryer as suggested and all is fine. The coach is now drivable. The issue is in the dryer. Probably going to winterize and put in shop for routine chasis and transmission service and have the dryer handled there. Thanks everyone for all your help.
__________________

__________________
DebnDan is offline   Reply With Quote
Reply

Tags
leak



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
No Air For A While jhanan Freightliner Motorhome Chassis Forum 20 06-26-2015 11:50 AM
Essex dash air freon leak JOQ Newmar Owner's Forum 13 05-10-2014 07:06 PM
Low Air presure - Park Brake iamduane Alpine Coach Owner's Forum 15 05-07-2014 05:49 PM
Chasing air leak ... AFChap Spartan Motorhome Chassis Forum 20 04-24-2014 09:00 PM
Air leak? Roscott Newmar Owner's Forum 6 02-22-2014 09:09 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:36 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.