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Topic: Air throttle installation to replace King Controls (Read 739 times) previous topic - next topic

Air throttle installation to replace King Controls

Replacing the King Controls throttle in our '98 U295 with an air throttle, using jor's excellent writeup as our guide. He tapped into the air system under the coach with a 1/2" x 1/2" x 3/8" brass tee (see pic) which I cannot find anywhere online or at a local shop. Does anyone have a part # and/or know where I can find this?
1998 U295 36' No slides
Towing 2018 Jeep Wrangler
Previous rigs:
  1995 26' Fleetwood Flair
  1998 34' Fleetwood Bounder
  1997 40' Bluebird BMC
  1999 24' Winnebago Minnie Class C

Re: Air throttle installation to replace King Controls

Reply #1 –
That would be an air brake fitting and a hydraulic hose an fitting store should have one.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport

Re: Air throttle installation to replace King Controls

Reply #2 –
Try the Parker online catalog.  They carry those fittings.

https://www.parker.com/literature/Fluid%20Connectors%20Group/Fluid%20Connectors%20Group%20Static%20Files/I-AirBrakeProducts.pdf
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: Air throttle installation to replace King Controls

Reply #3 –
Quote from: Chuck & Jeannie –
Try the Parker online catalog.  They carry those fittings.

https://www.parker.com/literature/Fluid%20Connectors%20Group/Fluid%20Connectors%20Group%20Static%20Files/I-AirBrakeProducts.pdf
Just looked at Parker - I don't see it there.
1998 U295 36' No slides
Towing 2018 Jeep Wrangler
Previous rigs:
  1995 26' Fleetwood Flair
  1998 34' Fleetwood Bounder
  1997 40' Bluebird BMC
  1999 24' Winnebago Minnie Class C

Re: Air throttle installation to replace King Controls

Reply #4 –
The part I'm looking for assumes I would be tapping into a 1/2" air line to supply the new air throttle. I'm not sure now which line I should be using. See attached diagram. Where would anyone suggest, and what have others done when they upgraded to the air throttle?
1998 U295 36' No slides
Towing 2018 Jeep Wrangler
Previous rigs:
  1995 26' Fleetwood Flair
  1998 34' Fleetwood Bounder
  1997 40' Bluebird BMC
  1999 24' Winnebago Minnie Class C

Re: Air throttle installation to replace King Controls

Reply #5 –
Quote from: Dan & Annie –
He tapped into the air system under the coach with a 1/2" x 1/2" x 3/8" brass tee (see pic) which I cannot find anywhere online or at a local shop. Does anyone have a part # and/or know where I can find this?
I found one:

98786 Composite DOT Approved Union Tee, Push-To-Connect Air Brake Fitting,...

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: Air throttle installation to replace King Controls

Reply #6 –
Quote from: Chuck & Jeannie –
I found one:

98786 Composite DOT Approved Union Tee, Push-To-Connect Air Brake Fitting,...


Chuck you're good. Thanks. Wish I didn't have to buy 5 at a time.
1998 U295 36' No slides
Towing 2018 Jeep Wrangler
Previous rigs:
  1995 26' Fleetwood Flair
  1998 34' Fleetwood Bounder
  1997 40' Bluebird BMC
  1999 24' Winnebago Minnie Class C

Re: Air throttle installation to replace King Controls

Reply #7 –
Isn't the tee reversed for what you need?
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: Air throttle installation to replace King Controls

Reply #8 –
Quote from: craneman –
Isn't the tee reversed for what you need?
If I'm tapping into an existing 1/2" line, then I'd want 1/2" on the two ends and 3/8 in the middle of the tee.
1998 U295 36' No slides
Towing 2018 Jeep Wrangler
Previous rigs:
  1995 26' Fleetwood Flair
  1998 34' Fleetwood Bounder
  1997 40' Bluebird BMC
  1999 24' Winnebago Minnie Class C

Re: Air throttle installation to replace King Controls

Reply #9 –
This looks to be exactly what I need. Thanks Charles.
https://www.oreillyauto.com/detail/c/surelok/gates-surelok-hydraulic-fitting/gasu/g314510806/v/a/28812/automotive-car-2008-ford-focus?brand=true&pos=8
1998 U295 36' No slides
Towing 2018 Jeep Wrangler
Previous rigs:
  1995 26' Fleetwood Flair
  1998 34' Fleetwood Bounder
  1997 40' Bluebird BMC
  1999 24' Winnebago Minnie Class C

Re: Air throttle installation to replace King Controls

Reply #10 –
Good work finding the "T" union.  That one never showed up in my casual Google search.  Proves that Google doesn't know everything about everything!

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: Air throttle installation to replace King Controls

Reply #11 –
I'm still looking for advice on where to tap into the existing air system. The instructions I'm looking at say to cut the front tank's 1/2" air line, reconnect it with the 1/2" openings on the T, then connect the Supply line to the 3/8" opening on the T. It is not clear to me what line he is referring to. The more I study the diagram the more I think I want to tap into a 3/8" line somewhere downstream of the pressure protection valve, so any catastrophic failure of my installation would not suddenly bleed the air out of the braking system. Thoughts?
1998 U295 36' No slides
Towing 2018 Jeep Wrangler
Previous rigs:
  1995 26' Fleetwood Flair
  1998 34' Fleetwood Bounder
  1997 40' Bluebird BMC
  1999 24' Winnebago Minnie Class C

Re: Air throttle installation to replace King Controls

Reply #12 –
Forgive me if I'm wrong, but there are two front tanks; the braking system is spit into two circuits similar to the system on your automobile, if one fails you have something left with which to work.
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.

Re: Air throttle installation to replace King Controls

Reply #13 –
Making progress with the air throttle install. Air lines are run and hooked up, with pressure regulator and ball valve shutoff in place. Treadle valve pedal installed and operating, providing variable air pressure to end of hose under the bed. Now just waiting for throttle control cylinder and throttle position sensor to arrive.
1998 U295 36' No slides
Towing 2018 Jeep Wrangler
Previous rigs:
  1995 26' Fleetwood Flair
  1998 34' Fleetwood Bounder
  1997 40' Bluebird BMC
  1999 24' Winnebago Minnie Class C