D2 Governor

Topic: D2 Governor (Read 6382 times) previous topic - next topic

Re: D2 Governor

Reply #25 – February 26, 2021, 04:47:28 pm

Quote from: Chuck & Jeannie – February 26, 2021, 11:50:48 am

Scott,

Hard to tell from your photo. Is your D2 mounted on the frame or directly on the engine air compressor?

Viewing from the back side of the coach right side of the engine. Mounted on the compressor as your photos showed. So compressor and engine to the left of the photo

Re: D2 Governor

Reply #26 – February 28, 2021, 12:47:55 pm

Chuck I did say a working spare.
Some here will replace a working governor just because they want a new one. That working takeoff would serve as an on the side of the road replacement for me.

Re: D2 Governor

Reply #27 – June 16, 2021, 11:09:29 am

Where is the wet tank that has been stated in this topic that requires letting air out? And can all of this be done without safety stands, just at the back or eh engine?

Re: D2 Governor

Reply #28 – June 16, 2021, 11:19:11 am

There is a air line on the drivers side in front of the rear tire with a valve on it
that drains the wet tank.

Re: D2 Governor

Reply #29 – June 16, 2021, 11:20:19 am

Again, you should NEVER get anything but clean dry air from the wet tank drain valve. If you do, the air dryer has FAILED.

Re: D2 Governor

Reply #30 – June 16, 2021, 11:28:16 am

Thanks again guys for the location of the valve. The coach can be off and NOT on safety stands for all of this right. I do have the coach tires blocked

Re: D2 Governor

Reply #31 – June 16, 2021, 11:32:49 am

Quote from: dicksop – June 16, 2021, 11:28:16 am

Thanks again guys for the location of the valve. The coach can be off and NOT on safety stands for all of this right. I do have the coach tires blocked

No need to safety stands. You can reach in to access the valve without getting under the coach. Just kneel down in front of the driver's side rear tire and look up/forward.

Re: D2 Governor

Reply #32 – June 16, 2021, 12:15:19 pm

On this coach it is on the passenger side behind the A/C compressor.

Re: D2 Governor

Reply #33 – June 16, 2021, 12:32:49 pm

Quote from: craneman – June 16, 2021, 12:15:19 pm

On this coach it is on the passenger side behind the A/C compressor.

...wet tank drain valve?

Re: D2 Governor

Reply #34 – June 16, 2021, 12:33:18 pm

Quote from: craneman – June 16, 2021, 12:15:19 pm

On this coach it is on the passenger side behind the A/C compressor.

Wow, never seen the wet tank drain there. Wonder if someone rerouted it.

OK, on edit, think Craneman is referring to the common location of the air governor/D2.

Re: D2 Governor

Reply #35 – June 16, 2021, 01:11:38 pm

Yes I was following the top of the thread and missed moving it to drain valve.

Re: D2 Governor

Reply #36 – June 16, 2021, 03:46:54 pm

Quote from: craneman – June 16, 2021, 01:11:38 pm

Yes I was following the top of the thread and missed moving it to drain valve.

You need to keep up! This is a fast moving thread! No place for laggards.

Re: D2 Governor

Reply #37 – July 11, 2021, 12:44:36 pm

I decided to adjust my d2 governor so I could get the pressure up around 125 before to it releases pressure. ( it was at about 110-115) When I adjust it counterclockwise gently to increase the pressure it then released at at about 140. When I rotated it clockwise to decrease the pressure I had to do almost a 3/4 turn to get it down and then it went to about 110. I fiddled some more with it and the only two settings I can get it hold are 140 and about 110. Is it Alright to leave it at 140?? If I can not get it set again to 125 does this mean the unit has to be replaced. ? Maybe the adjustment is really sensitive. Any one had these experiences? Perhaps I should have just left the darn thing alone!!

Re: D2 Governor

Reply #38 – July 11, 2021, 12:50:14 pm

125seems optimal. 140 may find more leaks. Try turning a 1/4 turn and cycling the system .

Re: D2 Governor

Reply #39 – October 27, 2021, 12:44:40 pm

Since a few months ago when I replaced my air dryer my PSI is steadily been increasing. Now today leaving Sioux falls going south I noticed that my gauges are topping off at 150 psi. I'm not really hearing it release Air anymore. It's cold outside it's raining and I have another 180 miles to go before I get to where I'm headed. At idle both PSI gauges are running at around:110, but at highway speeds they're headed they're topping at 150 psi. I drained my wet tank which I haven't done in a little while and got some water mixed with some rust out and then just clear air. Anybody have this happen to them before I guess I need to change the D2 out? Unfortunately I won't be able to do it for a few days. Any input would be appreciated...
Bob

Re: D2 Governor

Reply #40 – October 27, 2021, 01:13:16 pm

Many new ones come set at 130 which I set mine. Makes airing up front tires easier for me. The adjustment is very sensitive.

Re: D2 Governor

Reply #41 – October 27, 2021, 01:21:36 pm

FYI the remanned haldex units use plugs that require a 3/16 allen wrench. That size key isn't always included in the little sets you can buy so double check you have one before you head to the store.

I spent more time setting up the new governor (which can be done inside where it's warm) than actually taking it off and putting it back on.

Re: D2 Governor

Reply #42 – October 27, 2021, 01:50:09 pm

I keep a spare with the plugs already installed in the correct ports. Makes the change quick.

Re: D2 Governor

Reply #43 – October 27, 2021, 02:22:25 pm

Quote from: Journey, Roam, Explore – October 27, 2021, 12:44:40 pm

Since a few months ago when I replaced my air dryer my PSI is steadily been increasing. Now today leaving Sioux falls going south I noticed that my gauges are topping off at 150 psi. I'm not really hearing it release Air anymore. It's cold outside it's raining and I have another 180 miles to go before I get to where I'm headed. At idle both PSI gauges are running at around:15 but at highway speeds they're headed they're topping at 150 psi. I drained my wet tank which I haven't done in a little while and got some water mixed with some rust out and then just clear air. Anybody have this happen to them before I guess I need to change the D2 out? Unfortunately I won't be able to do it for a few days. Any input would be appreciated...
Bob

If water and rust came out you may have an air dryer issue. Only air is supposed to come out of that valve.

Re: D2 Governor

Reply #44 – October 27, 2021, 02:32:35 pm

Yeah I haven't been draining it very often. It was just slightly rust colored water. Since it's raining in the ground as wet it's a little hard to tell. The air dryer is new from find it parts and even though it wasn't the exact same replacement and I should have kept my core but I didn't.
I'm not hearing the purge valve go off and the purge valve is on the air dryer is it not? I thought maybe I had blocked something up when I turned around in Wyoming cuz that's when I started seeing increased pressures but not like this. Right now at idle I'm getting 115PSI. I went out and looked at the D2 and the dial was very loose so I turned it a little left and that Max the PSI at 150 so I went back out and turned it to the right and it only went a little bit. I'm at a rest stop right now so I'm going to try driving a little bit more and see if it changed anything. I'm starting to think that I may have an actual spare somewhere I know I have a Bendix spare but I don't remember if it's the D2 or not. Got 127 miles left for the day so I'm going to try to make it there and then look into replacing this

Re: D2 Governor

Reply #45 – October 27, 2021, 02:46:36 pm

If your air gauges are reading 150 psi and this is the actual pressure in your brake tanks (IE the gauges are not malfunctioning) then you definitely have a problem. If you don't hear the air dryer purging (when the air compressor cuts out) then your D2 may be stuck and has lost control over the air compressor. In this case the only thing left that controls the system air pressure is the pressure relief safety valve on your wet tank. This valve should open at about 150 psi if it is operating correctly. If run uncontrolled, the air compressor will continue to produce pressure and the excess pressure will (hopefully) be vented through the relief valve. This is not a safe way to continue operating the coach. You should replace the D2 governor at the first opportunity.

Note: There is also a pressure relief safety valve on your air dryer, but it probably does not open until 175 psi. See link below:

Haldex KN31527 Safety Valve, 3/8" NPT, 175 PSI: AnythingTruck.com, Truck &...

D2 adjustment instructions here:

The selected media item is not currently available.

Re: D2 Governor

Reply #46 – October 27, 2021, 07:02:43 pm

Thanks chuck. That's what I needed to know. Fortunately about a year ago somebody was talking about this very part and I ordered one forgot what exactly I ordered but I knew I had a box with Bendix on it. So I now have that in my hand and I guess tomorrow morning before I get on the road I'll be changing it out.
Any tips on it would be appreciated. I guess I don't know how this was factory adjusted until I install it and see what happens.

Re: D2 Governor

Reply #47 – October 27, 2021, 08:52:52 pm

Quote from: Journey, Roam, Explore – October 27, 2021, 07:02:43 pm

I guess I don't know how this was factory adjusted until I install it and see what happens.

It should be set to the pressure range shown on the paper tag (105-125 psi) which is a good setting. Don't mess with the adjustment screw until you give it a try.

Make a note of any air line connections before you remove them. Put the included set screw plugs in the unused ports so it looks just like the old one that you take off. Any other questions refer to the tech sheet I linked in prior post.

Re: D2 Governor

Reply #48 – October 27, 2021, 10:20:53 pm

Quote from: Journey, Roam, Explore – October 27, 2021, 07:02:43 pm

Thanks chuck. That's what I needed to know. Fortunately about a year ago somebody was talking about this very part and I ordered one forgot what exactly I ordered but I knew I had a box with Bendix on it. So I now have that in my hand and I guess tomorrow morning before I get on the road I'll be changing it out.
Any tips on it would be appreciated. I guess I don't know how this was factory adjusted until I install it and see what happens.

Changing D2 - access method

Re: D2 Governor

Reply #49 – October 30, 2021, 11:30:03 am

Well I changed it out the day before up in Nebraska and initially at idle and at 1500 RPMs while not moving the PS I stayed at 1:30 or below. But once I got on the road yesterday that quickly changed and I was hovering between 130 and 150 psi again. finally I stopped and got out and cranked the wet tank open partially. What came out was water mixed with a white chalky substance so I'm pretty sure that my air dryer is kaput. I left the wet tank ranked and drove on down the road and I was able to keep the pressure is down around 130 PSI. Although there were times again when it would go up to 150. The air dryer was remanufactured haldex from find it parts that I installed last year in Arizona. So not even a year old. I've got a rebuild kit coming to Mark's house in Uvalde and I'll have in a couple days but today I am out for the parts to do the bypass. I think that when I was in Wyoming and dispersed camping and I made a u-turn that I may have jammed that end of the coach where the air dryer is into some dirt and that clogged up my purge valve. I'm not sure if that would be connected with this or not. I guess there's a possibility that my governor was bad but I don't think that was the issue. If anybody has any other ideas I'd be happy to hear them. The biggest question is whether it's the actual compressor but my understanding is that the governor should control that. I have a new governor on order as well just in case.

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