Air Hose Connection

Topic: Air Hose Connection (Read 1321 times) previous topic - next topic

Re: Air Hose Connection

Reply #25 – September 07, 2014, 01:54:27 pm

Quote from: acousticart – September 07, 2014, 12:08:47 pm

.........................The adjustment can raise or lower the 20 psi cut in/cut out range, so I wonder why there might be an advantage to getting one with a higher (or lower for that matter) preset range..............................................

Don,
There are adjustable and non-adjustable governors available. NAPA, for instance, carries many:
New and remanufactured, Standard and Hi Temp, Hi, Lo psig, fixed and adjustable.

AS Examples:

TWD BEN800361 105-130 (New) $52.65
TWD BEN275200N 90-105 (New) $49.50
TWD BEN284358N 105-125 High Temperature (New) $56.25
TWD BENOR275491X 100-120 Standard Governor, (Remanufactured) Adjustable $19.35

As I understand it, the non-adjustable governors tend to be more stable and durable over the long term. The non-adjustable are OEM on the Peterbilts and Kenworths that I am familiar with.
Only the "cut-in" (or "cut-out"), depending upon how you prefer to think of it, set point is adjustable on an "adjustable governor", and then by only 5 to 10 psig ..................at least for reliability and repeatability over the long term.
The non-adjustable governors have a fixed value internal spring that is then mechanically adjusted and factory locked at a specific cut-out value. "Hi" and "Lo" range D2's have different fixed value springs. The difference between "cut-in" and "cut out" is always non-adjustable on either fixed or adjustable Governors.

What follows is from the Bendix parent document (Also previously provided by Elliott).
(Quote):
"OPERATING TESTS"
"Start the vehicle engine and build up air pressure in the airbrake system and check the pressure registered by a dash or test gauge at the time the governor cuts-out, stopping the compression of air by the compressor. The cut-out pressure should be in accordance with the pressure setting of the piece number ( Governor) being used. (Common cut-out pressures are between 105-125 psi.) With the engine still running, make a series of brake applications to reduce the air pressure and observe at what pressure the governor cuts-in the compressor. As in the case of the cut-out pressure, the cut-in pressure should be in accordance with the pressure setting of the piece number (Governor) being used. (Common cut-in pressures are between 90-105 psi.) Never condemn or adjust the governor pressure settings unless they are checked with an accurate test gauge or a dash gauge that is registering accurately. If the pressure settings of the D-2 governor are inaccurate or it is necessary that they be changed, the adjustment procedure follows:

Note: If the governor cover is marked nonadjustable (and the adjusting stem has been sheared off), this is a non-serviceable governor and must be replaced with a new or re-manufactured unit.

A. Remove the top cover from the governor.
B. Loosen the adjusting screw lock-nut.
C. To raise the pressure settings, turn the adjusting screw counter-clockwise. To lower the pressure settings, turn the adjusting screw clockwise. Note: Be careful not to over adjust. Each 1/4 turn of the adjusting screw raises or lowers the pressure setting approximately 4 psi.
D. When proper adjustment is obtained, tighten the adjusting screw lock-nut and replace the cover.
(Note: The pressure range between cut-in and cut-out is not adjustable.)"
(End Quote)
Hope this answers your question,
Neal

Re: Air Hose Connection

Reply #26 – September 07, 2014, 03:35:43 pm

Knock on wood, no D2 problems here...yet. But WHEN they surface, where can I find the critter on my coach. Is it engine-mounted?

Re: Air Hose Connection

Reply #27 – September 07, 2014, 03:48:56 pm

Brad, it's mounted on top of the air compressor. Looking at your eng from the back, it will be on the right hand side, just forward of the A/C pump.

Richard B

Re: Air Hose Connection

Reply #28 – September 07, 2014, 04:00:02 pm

Quote from: rbark – September 07, 2014, 03:48:56 pm

Brad, it's mounted on top of the air compressor. Looking at your eng from the back, it will be on the right hand side, just forward of the A/C pump.

Richard B

Thanks! Today's job is gonna be to replace the toilet seal...These jobs are so much easier to do while OFF the road. At 12 years (9 with me), and 78k miles, I'm thinking a little D2 insurance may be a good idea while off the road as well.

Re: Air Hose Connection

Reply #29 – September 07, 2014, 10:56:25 pm

I have one as a spare for when I'll need it. Made sure it's the same PSI setting as the one in service. If it's good enough for the factory install, it's good enough for me

Richard B

Re: Air Hose Connection

Reply #30 – September 08, 2014, 01:05:59 am

Thanks Neal... I will dig out my new spare and see which it is. I suspect it is the 100-120 PSI rebuilt adjustable. I will turn up the one that is on there and see if will consistently cut out at 130 psi. Afraid I won't really be able to test the cut in until I work through the air dryer issue.
Don

Quote from: Neal Pillsbury – September 07, 2014, 01:54:27 pm

Hope this answers your question,
Neal

Re: Air Hose Connection

Reply #31 – September 08, 2014, 05:45:04 pm

All of this makes me glad I have a Hi-Volumn/Capacity 12V direct to battery connected compressor.. pc

Re: Air Hose Connection

Reply #32 – January 01, 2015, 06:14:30 pm

I finally got a new one made by Max well and it is same as used by some of the tire shops in this area. $90. Nice easy to read.
JohnH

Re: Air Hose Connection

Reply #33 – January 01, 2015, 07:19:16 pm

Learning is fun: Air GOVERNOR - YouTube

Re: Air Hose Connection

Reply #34 – January 05, 2015, 09:40:15 pm

Yep, that's where it is on my coach, except to left of the LP tank.

Re: Air Hose Connection

Reply #35 – January 05, 2015, 11:21:24 pm

Quote from: pocketchange – September 08, 2014, 05:45:04 pm

All of this makes me glad I have a Hi-Volumn/Capacity 12V direct to battery connected compressor.. pc

Unfortunately any compressed air that does not go though the chassis air dryer rusts the steel cord belts inside your tires slowly but surely. Thin rubber over the cord plies allows water vapor through it.

Used to look at failed tires on coaches years ago. Rust inside them all.

Dry air only

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Re: Air Hose Connection

Reply #25 – September 07, 2014, 01:54:27 pm

Re: Air Hose Connection

Reply #26 – September 07, 2014, 03:35:43 pm

Re: Air Hose Connection

Reply #27 – September 07, 2014, 03:48:56 pm

Re: Air Hose Connection

Reply #28 – September 07, 2014, 04:00:02 pm

Re: Air Hose Connection

Reply #29 – September 07, 2014, 10:56:25 pm

Re: Air Hose Connection

Reply #30 – September 08, 2014, 01:05:59 am

Re: Air Hose Connection

Reply #31 – September 08, 2014, 05:45:04 pm

Re: Air Hose Connection

Reply #32 – January 01, 2015, 06:14:30 pm

Re: Air Hose Connection

Reply #33 – January 01, 2015, 07:19:16 pm

Re: Air Hose Connection

Reply #34 – January 05, 2015, 09:40:15 pm

Re: Air Hose Connection

Reply #35 – January 05, 2015, 11:21:24 pm

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