| [GMCnet] Re: Rear bag inflation/height cut off valves [message #368062 is a reply to message #368060] |
Thu, 16 December 2021 14:32   |
James Hupy
Messages: 6806
Registered: May 2010
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Senior Member |
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I have a bunch of experience with all 4 types.
Type 1. No controls. Entirely up to the compressor and ride height
controls. All pneumatic.
Type 2. Same as Type 1, except for the knobs in the dash. Same compressor
and air tank, and a whole bunch of air lines front to rear. No electronics.
Type 3. Compressor and air hoses about the same on early models, then
compressor moved to the rear of the coach, a bunch of solenoid controlled
air valves added, along with rocker switches by the driver's left elbow.
Same ride height mechanism.
Type 4. EL-2. Everything is different, except for the rocker switches. Ride
height now controlled by electronic ride height controls. Two compressors,
lots of solenoids and valves all located in the rear of the coach. Only two
air lines. Left and right. Blue and grey. Ride height links hook up to
electronic controllers. State of the art circuit boards for the late 70's.
Uses shutter wheels and light emitting diodes and transistor sensors. All
sealed in epoxy. No user service possible.
Jim Hupy
Salem, Oregon
On Thu, Dec 16, 2021, 10:40 AM Keith V wrote:
> It's easy to set the ride height without the side effects of the height
> valve time delay and deadband.
> It does work best with adjustable links...
>
> All you have to do is:
>
> 1. remove the link from the bogie to the height valve. ( the sensor
> will now be in the middle its deadband )
> 2. adjust the coach height in manual mode to the middle of the height
> range.
> 3. adjust the link so you can reconnect the link without changing the
> position of the height valve
> 4. Done
>
> This will eliminate any need to bounce the suspension or wait for the
> valve to adjust the height.
> this is what I did before I got rid of the stock system
>
> Keith Vasilakes
> Mounds View MN
> 76 exRoyale
> MicroLevel http://www.gmcmotorhomemarketplace.com/vasilakes/microlevel_intro.pdf>
>
>
> ________________________________
> From: twlldeen@gmail.com
> Sent: Thursday, December 16, 2021 11:30 AM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] Re: Rear bag inflation/height cut off valves
>
> lqqkatjon wrote on Thu, 16 December 2021 05:29
>> On your el1. It basically routes air through that “height” valve in
> wheel well when in “travel”.
>>
>> That valve then vents air out of bag or into bag to adjust height.
> (Wants to keep itself centered). The oem valves should have a time delay
>> before it valves.
>>
>> The easiest way to adjust ride height with those valves is to install an
> adjustable link to the bogie arm. Most venders have those. (There are
>> two different lengths i believe).
>
> Thanks! makes sense. I also just received an emailed .pdf of the 77-78
> supplement from a fellow member... Thanks all!
>
> Larry
>
> --
> Larry - Victoria BC -
>
> 1977 ex-Palm Beach "Ol' Leaky" 40,000 miles, PO said everything working
> but forgot the word NOT. Atwood helium fridge, water heater & furnace. SS
> exhaust system, Onan, Iota Converter, R134A, New fuel lines & heat
> exchange hoses
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