Jim,
Was I incorrect when I stated "works like the OEM system and controls ride height through sensors that adjust the attitude of the coach as you go down the road. If you are on a road that is highly crowned it will raise the curb side automatically with no input from the driver?"
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of James Hupy
Sent: Wednesday, July 18, 2018 7:34 PM
To: gmclist
Subject: Re: [GMCnet] Alternate,air pump
Rob, the OEM systems ride height is ( are) controlled in two ways.
1. The original early system was entirely operated by air pressure
and left and right hydraulic/pneumatic height control valves that sensed
movement of the frame height when the load in the coach either increased or
decreased. That moved the linkage attached to the height control valves.
Built into the valves was a time delay of up to 18 seconds before any air
was let into the air bag or out of it. In addition, there was a null space
of + or- 3/8" where the frame could move up or down without anything
happening. That is a dead space of 3/4" in the center of the travel. Small
road shocks of a duration of less than 18 seconds never activate this
system.
2. The second generation of height control used the same height
control valves, and had the same operating parameters as the one I
described above. Differences in these two systems were that rocker switches
replaced the original round knob air valves in the dash, and added
solenoids with valves to control the inlet and exhaust of air to the height
control valves. Same null space and time delay as the original system.
3. Finally, the Electro Level II system came out. Totally electric in
control of ride height. Used LED light sources aligned with photo
transistors to open and close electrical circuits that either opened
exhaust valves or started smaller compressors to raise or lower the coach.
Manual controls in the form of rocker switches allows the operator to raise
or lower the coach as required. The null point is narrowed to 5° of travel,
and the time delay is lengthened to a max of 28 seconds before anything
happens. Shutter wheels attached to linkage either block the led's or
expose them to the photo transistors.
Small road shocks, swales of short duration (less than 28 seconds) do
nothing to activate the system. All this information is from GMC manuals,
not from my foggy brain. What does change ride height is inputs from the
driver through the rocker switches, or changes in loads in the coach.
Jim Hupy
Salem, Or
> Keith,
>
> To me the MOST important thing about the MicroLevel system is that it
> works like the OEM system and controls ride height through
> sensors that adjust the attitude of the coach as you go down the road. If
> you are on a road that is highly crowned it will raise the
> curb side automatically with no input from the driver just like the OEM
> system.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces] On Behalf Of Keith
> V
> Sent: Wednesday, July 18, 2018 8:52 AM
> To: gmclist
> Subject: Re: [GMCnet] Alternate,air pump
>
> Why would you EVER run ANY air compressor without a pressure switch??
> Thats just asking for trouble, don't do it. The over pressure valve is not
> designed for multiple cycles!
> Even manual mode should just enable the pressure switch, not over ride it.
>
> Better than wire less air, MicroLevels RF remote allows individual height
> control of both sides, so you can tilt the coach for
> dumping. This even works with the ignition off as MicroLevel wakesup on a
> button press, enables the compressor and opens the
> valve(s).
> Not to mention true height control and campground leveling.
>
> Keith Vasilakes
> 75 ex Roylae
> MicroLevel<
>
http://www.gmcmotorhomemarketplace.com/vasilakes/microlevel_intro.pdf>
>
>
>
>
>
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When I put the ViAir on the 23' I kept the original shutoff switch for just that reason.
