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Topic: Both Right Rear Air Bags Leaking (Read 3214 times) previous topic - next topic

Both Right Rear Air Bags Leaking

OK, I give. I had been to the HWH tech school when I was a FT tech.
I have read all the manuals including the tech manual again. I have read everything on here through search. I understand the leveling system. But maybe I don't. I slept since then!
This one has me scratching my head So before I throw parts at my 1997 U295 HWH 600 air system, lets see what you have to say.We are loosing about 1 1/2" a day, only in the right rear air bags equally.
In auto, it takes care of itself, but it also wakes me up when it dumps, and is using too much DC when the compressor has to run more then normal.
At this point, I have the 2 lines to the Ride Height valve unhooked and capped. I have also been over the system including soaking both bags several times with soapy water. There are no external leaks. Air drop is within range of the coach spec's.
What am I missing? I have a few idea's., but don't want to guess.
Have a call into HWH, but not guaranteed they are going to call me any time soon. Short handed I was told.This is one of the best reason's for this sight. Help, pretty much 24/7.
Cheers, and thanks in advance for your input
Chris

Re: Both Right Rear Air Bags Leaking

Reply #1 –
I'm not expert on this, but could it be the six pack?

Re: Both Right Rear Air Bags Leaking

Reply #2 –
Quote from: qcj –
I'm not expert on this, but could it be the six pack?

I would also look at the rear six pack, especially RR dump solenoid.  At minimum, replace the o-rings on the solenoid valves (posts on forum Wiki with sizes you can buy at a hardware store How to operate the leveling System [ForeForums Foretravel Motorcoach Wiki]  scroll down to "Ultimate Guides to the HWH Sixpack ).  Even better, if you have the luxury, get a rebuild kit from Tom of the Newell Gurus site which will contain o-rings, plungers, and springs.

Re: Both Right Rear Air Bags Leaking

Reply #3 –
Spray the six packs with soapy water from an aerosol bottle (old windex bottle). Soak it down front and back. If you are leaking there you should see something. Be sure to look down in-between the solenoids for bubbles. BTW: air up completely before testing.

see ya
ken

Re: Both Right Rear Air Bags Leaking

Reply #4 –
Quote from: kenhat –
Spray the six packs with soapy water from an aerosol bottle (old windex bottle). Soak it down front and back. If you are leaking there you should see something. Be sure to look down in-between the solenoids for bubbles. BTW: air up completely before testing.

see ya
ken
Thanks. Have done that a bunch of times, just like you suggest. I pride myself on finding leaks.Don't mean to brag, but when I was  a FT tech, They gave me all the air leaks. Customers would come and thank me, telling me they had been to other FT stores, and they couldn't find the leak.
If they are leaking, it is internal. I know the coach is due for a 6 pack rebuild, I was just trying to zero in on which valve it may be, by someone else's experience. I have a hunch which one it is.
I did get a call back from HWH tonight. They took all my info, and said they will call back. But not today.I will go easy on them,because I love Iowa folk. I was born in Des Moines, and lived in Nevada Iowa till I was 5. Family still lives there.
Just glad I am not sitting on the side of the road, waiting for them to return my call!
Cheers

Re: Both Right Rear Air Bags Leaking

Reply #5 –
Can you take the 6 pack out of the equation, and air up everything downstream of the 6 pack to the rr?

Re: Both Right Rear Air Bags Leaking

Reply #7 –
I made a pressure tester that I can attach at different points and pressurize different items and then watch the gauge on the tester to look for leaks. You can pressurize the individual bags and check for leakdown. I have a picture of it but not on this pc. If you would like I could take a picture of it and post it if you think it would be helpful.

Mark

Re: Both Right Rear Air Bags Leaking

Reply #8 –
Quote from: MAZ –
I made a pressure tester that I can attach at different points and pressurize different items and then watch the gauge on the tester to look for leaks. You can pressurize the individual bags and check for leakdown. I have a picture of it but not on this pc. If you would like I could take a picture of it and post it if you think it would be helpful.

Mark
Thanks. Great idea. I have all the stuff to make one on hand.
Chris

Re: Both Right Rear Air Bags Leaking

Reply #9 –
Chris:
I had a similar problem and finally found a knick in the air line going to the right rear bags. It was a small knick but could feel it when rubbing your hand over the line.  Replaced the air line which eliminated the problem.  Just another possibility which you have probably checked.

Jerrett

Re: Both Right Rear Air Bags Leaking

Reply #10 –
We're going to OTM for airbag replacement in January. I've asked them to also check and fix whatever other air leaks they can find.

Re: Both Right Rear Air Bags Leaking

Reply #11 –
I also put together a thing to help isolate where the leak is coming from.  In this case one end to the air bags and the other to the six pack. pump the air up and cut the valve off.  Sorry I could not get the photo to post

Re: Both Right Rear Air Bags Leaking

Reply #12 –
Quote from: MAZ –
I made a pressure tester that I can attach at different points and pressurize different items and then watch the gauge on the tester to look for leaks. You can pressurize the individual bags and check for leakdown. I have a picture of it but not on this pc. If you would like I could take a picture of it and post it if you think it would be helpful.

Mark
Professional!

Re: Both Right Rear Air Bags Leaking

Reply #13 –
UPDATE
The front air pressure protection valve for the rear tank is leaking bad. I didn't spray the exhaust hole before, so I missed it. I also didn't hear it, because I was rockin' to the stereo! Have two on order. I installed a piece of straight pipe to by pass till I get it. Don't worry,. not going to drive it.
I checked the #'s on my valve,. They are N15759 DG 70 056K MB. Nothing comes up. It is a G, I can see it clearly, but I found a cross reference to N15759 DC 70 056K MB. I also found just #'s N15759 here are 3 that can work with the same specs:
Haldex KN31000
Excel PR4 ( PT# EM36850)
Mac 20QE2128
Anywhere from $11.95 to $29.00 online + the ride
We will see what the RR back bags do overnight
Pictures at 11 O'Clock news!

Re: Both Right Rear Air Bags Leaking

Reply #14 –
Quote from: gracerace –
UPDATE
The front air pressure protection valve for the rear tank is leaking bad. I didn't spray the exhaust hole before, so I missed it. I also didn't hear it, because I was rockin' to the stereo! Have two on order. I installed a piece of straight pipe to by pass till I get it. Don't worry,. not going to drive it.
I checked the #'s on my valve,. They are N15759 DG 70 056K MB. Nothing comes up. It is a G, I can see it clearly, but I found a cross reference to N15759 DC 70 056K MB. I also found just #'s N15759 here are 3 that can work with the same specs:
Haldex KN31000
Excel PR4 ( PT# EM36850)
Mac 20QE2128
Anywhere from $21.00 to $48.00 online
We will see what the RR back bags do overnight
Pictures at 11 O'Clock news!
MOT have them, for about $38 ea. They ship the same day you order.

Re: Both Right Rear Air Bags Leaking

Reply #15 –
Quote from: jcus –
MOT have them, for about $38 ea. They ship the same day you order.

Thanks. I don't buy anything from FT, unless I have to. Wait 2 days to get a returned phone call to order ,then it's double the price. I don't mind paying someone, but there is never any tech support either.
I don't mean to bad mouth them, I like them. But friendship is friendship, business is business. Enough said.

Two off Ebay, $11.95 each $4.95 shipping.Delivered in 3 days $28.33.

PRESSURE PROTECTION VALVE - 1/4" NPT - REPLACES KN31000 9054107 | eBay

Re: Both Right Rear Air Bags Leaking

Reply #16 –
Quote from: gracerace –
Thanks. I don't buy anything from FT, unless I have to. Wait 2 days to get a returned phone call to order ,then it's double the price. I don't mind paying someone, but there is never any tech support either.
I don't mean to bad mouth them, I like them. But friendship is friendship, business is business. Enough said.

Two off Ebay, $11.95 each $4.95 shipping.Delivered in 3 days $28.33.

PRESSURE PROTECTION VALVE - 1/4" NPT - REPLACES KN31000 9054107 | eBay


MOT is Motorhomes of Texas, not affiliated  with Foretravel of Texas, good service, reasonable prices.
What is the pressure on the $12 valve?  Don't think I would go no-name on a protection valve.

Re: Both Right Rear Air Bags Leaking

Reply #17 –
Quote from: jcus –
MOT is Motorhomes of Texas, not affiliated  with Foretravel of Texas, good service, reasonable prices.
What is the pressure on the $12 valve?  Don't think I would go no-name on a protection valve.

Thanks for your input
I am sure they are good people. Original equipment part $29.95 free shipping. get in 3 days

KN31000 Pressure Protection Valve - Closes @ 45 PSI - Opens @ 65 PSI 1/4"...

The one I ordered is same specs. as factory one. 65/55 psi....They are all imports, regards of name

Here is the manufacture of the part. Far from 'No Name":

World American | Where Quality Meets Value!

Re: Both Right Rear Air Bags Leaking

Reply #18 –
Quote from: gracerace –
Thanks for your input
I am sure they are good people. Original equipment part $29.95 free shipping. get in 3 days

KN31000 Pressure Protection Valve - Closes @ 45 PSI - Opens @ 65 PSI 1/4"...

The one I ordered is same specs. as factory one. 65/55 psi....They are all imports, regards of name.



Here is the manufacture of the part. Far from 'No Name":

World American | Where Quality Meets Value!

You are right, could be made anywhere. The one MOT sells is the Meritor Wabco N-15759DC which was OEM for Foretravel.

Re: Both Right Rear Air Bags Leaking

Reply #19 –
Chris,

When I bought our coach, the protection valve still had the paper tag with the Meritor WABCO part number: 9348990060.

Mark