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Topic: Demco Air Force 1 (Read 2150 times) previous topic - next topic

Re: Demco Air Force 1

Reply #25 –
I was able to raise my coach and install the safety blocks I rounded up yesterday.  Climbed on the creeper and did a roundabout of the underside of my coach with the Air Schematic in hand. I have a marked up diagram showing what I think are the proper connection points system.

DEMCO describes the connections as

1. Metered Air
2. Air Supply connection

My interoperation is Metered Air = C  "Control"  Air Supply = S "Supply"

Metered Air (C) originates from one side of the Treadle  Valve "Brake Petal" it is a 3/8" air line.  Connects to the center valve of the three valve set.  This consists of the control valve with the ABS valves on either side. See highlighted C line going into the center valve. "Air Line 88", "Air Line 14"

Air Supply originates from the rear Air Tank. It is a 5/8" this also goes into the Center valve of the three valve group. This line is highlighted in the attachment. "Air Line 16"

I am including a partial diagram with some highlights.

https://www.foreforums.com/index.php?action=media;sa=item;in=4534

If you have installed an Air Force One please comment on my interpretation of this.  I am looking for comments before proceeding. Thank You
Thomas Mehkam.

2006 Numbus 336

2006 Nimbus 336
Built 2005 may be one of the first coaches labeled Nimbus.
DEMCO Air-force One braking system.
Towing 2002 Jeep Wrangler Sport.
Road Master Falcon 5250 tow bar.

Re: Demco Air Force 1

Reply #26 –
Ok I called DEMCO Tech support.

He had a Foretravel air schematic a dealer had supplied.  The same two lines are marked on his diagram as are on mine.  He verified those are the Supply and Control lines.  Demco calls them  Supply Air Connection and Metered air.    All is good I will complete and test the install.

Thank you guys for the help.  I likely could have done this from the photos you guys provided but It is a little difficult for me to identify the exact lines that were being cut.  This gives me the confidence to continue.  Will post photos of my install on the Jeep and Motorhome.

T.O.M.
2006 Nimbus 336
Built 2005 may be one of the first coaches labeled Nimbus.
DEMCO Air-force One braking system.
Towing 2002 Jeep Wrangler Sport.
Road Master Falcon 5250 tow bar.

Re: Demco Air Force 1

Reply #27 –
I sympathize with you checking and rechecking with all sources.  Of all the modifications and upgrades that I have done on my coach over the past fifteen years, cutting the brake system air line to install my Air Force One was the most anxiety inducing step I have done. 

Richard
Jan & Richard Witt
1999 U-320  36ft WTFE
Build Number: 5478 Motorcade: 16599
2011 Jeep Wrangler Unlimited w/Air Force One
Jan: NO5U, Richard:KA5RIW
The selected media item is not currently available.

Re: Demco Air Force 1

Reply #28 –
Got the air lines connected and did basic checkout with the Toad connected.  All works as expected.

I have a small amount of cleanup to do.  Paint some brackets I fabricated. Lock washers on some bolts etc.

The 5/8 supply line is a little tight.  I might purchase some line and redo that connection.  It is holding air and not leaking so probably not necessary but better safe than sorry.

Took some photos and will do a post with photos and a marked up air line schematic.  More info for the Next Guy.  May be a week or two until it is all done.
2006 Nimbus 336
Built 2005 may be one of the first coaches labeled Nimbus.
DEMCO Air-force One braking system.
Towing 2002 Jeep Wrangler Sport.
Road Master Falcon 5250 tow bar.

Installation summary : Demco Air Force 1 on 2006 Nimbus U336

Reply #29 –
I started out by asking questions on this Forum. I received a lot of great information.  Nothing specific for my year model coach though.

I dug through the air line schematics for my Coach. 

I Installed Safety Stands and Wheel Chocks then Lowered the coach onto the safety stands.  Thanks to the Forum for the safety information.

Spent a lot of time tracing the airlines under the Coach and identifying the parts. I modified a diagram and highlighted the two locations to cut the lines.

See attached file "2006 Demco air line tap locations.jpg"
 
I called Demico to verify my assumptions. Demco support sent me a 2002 Foretravel  schematic with marks on the two lines to cut.

See the attached file "2002 Foretravel Diagram small.jpg"

The 2002 and 2006 schematics were very similar.  My coach has an ATC valve and the 2002 did not.  I decided to ignore the ATC valve for now and connect at the control valve like was done in the 2002.

See photo of the three valve set attached "Rear Mentor Webco and Antilock Brake valve.jpg"  It is mounted to the inside drivers side of the frame "Near the transmission"

See photo "Airline connections to control valve.jpg" The large 5/8 line has been cut and Tee installed.  This is the supply "S" line.  The control line is the smaller 3/8" line "C" this is the signal from the foot Treadle Valve through the ATC valve.

NOTE: the ATC valve will apply brakes when one wheel rear wheel looses traction slowing the wheel without traction and transferring torque to the wheel that has good traction. Caution: This will also apply brakes on the Toad.  Might not be what we want. Another option would be connection to the control line where it connects to the ATC valve.

The 1/4" S and C lines are connect to the two tees and run over to the Demco air tank.  See attached photo "Demco Air Tank.jpg".
I fabricated a mounting plate for the air tank and bolted it to the battery tray supports and bolted the air tank to that plate.  Looking at the air tank the S line connects to the right side of the tank. 'Thank you Foretravel Forum for the mounting  idea."  The "C" line is routed to the bottom connection on the left side if the tank.  And the connection to the output of the control valve for the TOAD.  "Top far left:" goes to the bumper and air connection at the rear of the Coach.

See photo "Toad Air Connection.jpg"  The connection is installed on a fabricated mount screwed to the rear frame member to the right of the trailer hitch.  This places it at the correct height to clear the engine hatch without modifying the hatch.  Same ground clearance as the factory trailer light connection.

This installation has been tested and all works.  The only concern is the ATC and the solution is pretty simple.  Tee off the C line going to the input to the Webco ATC valve.  If I decide to do that I will change this post to reflect my decision.

Thank you every one for your input.  With out the input from many on this Forum I would still be stumbling around lost.








2006 Nimbus 336
Built 2005 may be one of the first coaches labeled Nimbus.
DEMCO Air-force One braking system.
Towing 2002 Jeep Wrangler Sport.
Road Master Falcon 5250 tow bar.

Re: Demco Air Force 1

Reply #30 –
Quote from: tmehrkam –

NOTE: the ATC valve will apply brakes when one wheel rear wheel looses traction slowing the wheel without traction and transferring torque to the wheel that has good traction. Caution: This will also apply brakes on the Toad.  Might not be what we want. Another option would be connection to the control line where it connects to the ATC valve.


Thank you every one for your input.  With out the input from many on this Forum I would still be stumbling around lost.


For those of us not blessed with automatic traction control, if you apply the parking brakes, when you use the engine to overpower the parking brakes you will have drive to both sides.  If you don't begin to move, give up and call the tow truck.*

*If you have helping hands in good health, 4X8 sheets of plywood will get you moving at less expense than the tow truck.
1992 Foretravel Grand Villa
U225 SBID Build No. 4134
1986 Rockwood Driftwood
1968 S.I.A.T.A. Spring
1962 Studebaker Lark
1986 Honda VF700C
1983 Honda VF750C
Charlie, the Dog was broken out of jail 24 Oct 2023
N1RPN
AA1OH (H)e who must be obeyed.