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Topic: D2 governor (Read 787 times) previous topic - next topic

D2 governor

The original D2 started leaking air. When I would shut off the coach you could hear air escaping from the governor for a short while and then stop.  I bought one off of Amazon that was to be equal to the one I had but the cut out pressure was around 115 and cut in was around 100. I cranked the cut in pressure up to around 128 but the cut out pressure did not increase, stayed at around 100. I figured it was an amazon D2 was my problem

I then went and took the original one to Fleetpride and they said the one that they had with that number was a 125 psi cutout.  I figured that was close so bought it.  On installation the cut out was around 118 so I adjusted it so cut out was around 128.  On my way to the Mid-South Fall Rally in Weatherford Oklahoma the D2 was cutting out around 125-128, but the cut in was maybe 89-92.  I have not see where I can adjust the cut out pressure. Am I missing it somewhere?

In looking I found Haldex Piston Type Air Compressor Governor Valve Part #: KN18530|Brand: HALDEX|MPN #: KN18530 that says it has a cut out of 130 & cut in @ 105  I will order that one and see if it works.

2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: D2 governor

Reply #1 –
There is a 30 PSI difference between cutoff and cut in. You can set the cut off but the cut in is going to be 30 PSI less.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: D2 governor

Reply #2 –
Why do you want the air pressure more than 90 to 120 psi? 
Dennis Haynes
Bohemia NY
2008 Nimbus 342 SE Carlyle
Build #6475
Motorcade #19148

Re: D2 governor

Reply #3 –
Quote from: Dennis H –
Why do you want the air pressure more than 90 to 120 psi?

Coach has HWH Active Air. With AA when you make a curve on the freeway, instead of Coach leaning,  AA will quickly put more air in the bags on the side of the lean to keep Coach level. Then will quickly dump the extra air after the turn
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: D2 governor

Reply #5 –
The governor should not be pressurized when not running .  You may have a bad check valve at the dryer letting air flow back to the. Compressor. 

Re: D2 governor Pressure settings

Reply #6 –
If the engine compressor can't keep up with the demand (volume) of the active air, raising the set point will not be of help. I doubt the airbags are anywhere near 90 psi for traveling. As for more stopping power, one of the reasons I now own a Foretravel is the braking system. Yes I have the extra brakes with the tag but even on the non-tags I test drove the Foretravel disks are just plain wow! If you need more maybe something is wrong.
Dennis Haynes
Bohemia NY
2008 Nimbus 342 SE Carlyle
Build #6475
Motorcade #19148

Re: D2 governor

Reply #7 –
Quote from: Dennis H –
If the engine compressor can't keep up with the demand (volume) of the active air, raising the set point will not be of help. I doubt the airbags are anywhere near 90 psi for traveling.

Attached is a picture of the HWH display with the coach sitting still at ride height.  If you look at the picture you will see what the pressure is in each bag or both bags per side of dual axle When I am in a curve at high speed you can see the pressures  increase on the side that the coach is leaning trying to bring it back to the same clearance as the other side is.  I would say if I was driving a road course I could run the tanks down  & compressor not keeping up with the AA putting a lot of air in one side and then dumping, while putting air to the other side.  If I press the dump button the same time as someone with a non AA system, my coach will be sitting on the stops with the bags empty or close to while the non AA coach is thinking about lowering. 

When Keith was working under the coach I told him to make sure he was clear before I started to dump air. He said that he would  have time to get clear once I started dumping. I waited until he was clear and dump the air. After I stepped back out he said '"I didn't expect it to lower that quick."

The AA system has 1/2" air lines going to each air bag with larger high flow valves that a non AA coach has.

Thus is the reason for the 130 cut out and 105 or above cut in. AA  can use a lot of air in turns and also during high side loads such as cross wind gusts. 

AA is an amazing system when it is working right. I have traveled with a friend that has an  Entregra Cornerstone which does not have  the height of the IH and he will complained about the cross winds and I would tell them that I had not felt anything.  He also says there is no way for him to take corners at the speeds that I take them at.
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: D2 governor

Reply #8 –
That will take a special governor or set the cut out at 135 which is still below the relief valve pressure to get the 105 cut in.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: D2 governor

Reply #9 –
Quote from: craneman –
That will take a special governor or set the cut out at 135 which is still below the relief valve pressure to get the 105 cut in.
Per everything I have read Air Compressor Governor Valve Part #: KN18530| is factory set for 130-105. we will know in a few weeks when I will have time to install it.
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: D2 governor

Reply #10 –
Always learning something new. I am surprised that those air bags need to operate at near 90 PSI to support the load.
Hard to believe that there would be blaring design failures for that series coach and the active air. Has the system failed to d what is needed? Getting back to my thoughts on available air volume maybe a larger or supplemental compressor is needed or increased storage capacity. Larger diameter air bags would also require less pressure to support a given load. 
Dennis Haynes
Bohemia NY
2008 Nimbus 342 SE Carlyle
Build #6475
Motorcade #19148

Re: D2 governor

Reply #11 –
I think the 130 top pressure is the legal max
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: D2 governor

Reply #12 –
Quote from: Caflashbob –
I think the 130 top pressure is the legal max
Can you point to some published document or regulation backing up your opinion?

I'm not disputing your assertion - just curious.  8)
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: D2 governor

Reply #13 –
WHAT IS THE MAXIMUM PRESSURE FOR AIR BRAKES - Google Search
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: D2 governor

Reply #14 –
Quote from: Dennis H –
Getting back to my thoughts on available air volume maybe a larger or supplemental compressor is needed or increased storage capacity.

Active Air has an additional air tank.  I have 5 air tanks.
Wet
Front
Rear
Active Air (which gets it's air from both the front and rear air tanks.)
Bladders and other items.

2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago
 

Re: D2 governor

Reply #15 –
Quote from: craneman –
WHAT IS THE MAXIMUM PRESSURE FOR AIR BRAKES - Google Search
I looked through many of the links on the Google search page.  I didn't see a clear consensus on any air pressure limit mandated by law.  One link referred to a Canadian regulation (?).  Lots of O-pinions, though...
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"