Air ride compressors

[Bob Dunahugh]

I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
Bob Dunahugh
78 Royale since 2003

 

[Jim Hupy]

I believe that he has an EL II system. That one has 2 smaller compressors
that as far as I know, there is not a rebuild kit available. These
compressors slooowww dowwwnnn after time because their permanent alnico
magnets lose their field strength. There may be a fix for those motors, but
I personally don't know of one. Because those compressor heads also contain
some of the solenoids that the EL II system uses, simple replacement of
them with VIAIR or similar compressors won't work. There are some junkyard
replacements that will work, but they are scarce. So, that leaves few
options. Check with Jim K and other vendors. They may have a fix that will
work.
Jim Hupy
Salem, Oregon

On Fri, Jul 31, 2020, 7:02 AM Bob Dunahugh via Gmclist <

> I hear of the original compressors being replaced due to lack of volume.
> Most of the time. It just requires a new cogged timing drive belt. That Jim
> K at Applied has for $8. On most coaches. That cogged belt can be retimed
> in place. The original compressor is very simple to rebuild. Jim K also has
> that kit. If you know what a screw driver is. You can do it. There was an
> air filter in the original unit. That it's remains needs to be cleaned out.
> ( That could be your compressor issue.)Then you can install a simple
> external air filter. Seems to me. That it's simpler/cheaper to simply
> service what you have. Then to find a way to mount a replacement compressor.
> Bob Dunahugh
> 78 Royale since 2003
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[charles boyd]

Sir, according to the picture he showed me of the leveling valve it is a Electro level 1.

> I believe that he has an EL II system. That one has 2 smaller compressors
> that as far as I know, there is not a rebuild kit available. These
> compressors slooowww dowwwnnn after time because their permanent alnico
> magnets lose their field strength. There may be a fix for those motors, but
> I personally don't know of one. Because those compressor heads also contain
> some of the solenoids that the EL II system uses, simple replacement of
> them with VIAIR or similar compressors won't work. There are some junkyard
> replacements that will work, but they are scarce. So, that leaves few
> options. Check with Jim K and other vendors. They may have a fix that will
> work.
> Jim Hupy
> Salem, Oregon
>
> On Fri, Jul 31, 2020, 7:02 AM Bob Dunahugh via Gmclist <

>
> > I hear of the original compressors being replaced due to lack of volume.
> > Most of the time. It just requires a new cogged timing drive belt. That Jim
> > K at Applied has for $8. On most coaches. That cogged belt can be retimed
> > in place. The original compressor is very simple to rebuild. Jim K also has
> > that kit. If you know what a screw driver is. You can do it. There was an
> > air filter in the original unit. That it's remains needs to be cleaned out.
> > ( That could be your compressor issue.)Then you can install a simple
> > external air filter. Seems to me. That it's simpler/cheaper to simply
> > service what you have. Then to find a way to mount a replacement compressor.
> > Bob Dunahugh
> > 78 Royale since 2003
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

--
C. Boyd
76 Crestmont
East Tennessee

 

[charles boyd]

http://www.gmcmhphotos.com/photos/data/7314/medium/Leaking_valve.jpg

> Sir, according to the picture he showed me of the leveling valve it is a Electro level 1.
>
>
>
>

> > I believe that he has an EL II system. That one has 2 smaller compressors
> > that as far as I know, there is not a rebuild kit available. These
> > compressors slooowww dowwwnnn after time because their permanent alnico
> > magnets lose their field strength. There may be a fix for those motors, but
> > I personally don't know of one. Because those compressor heads also contain
> > some of the solenoids that the EL II system uses, simple replacement of
> > them with VIAIR or similar compressors won't work. There are some junkyard
> > replacements that will work, but they are scarce. So, that leaves few
> > options. Check with Jim K and other vendors. They may have a fix that will
> > work.
> > Jim Hupy
> > Salem, Oregon
> >
> > On Fri, Jul 31, 2020, 7:02 AM Bob Dunahugh via Gmclist <

> >
> > > I hear of the original compressors being replaced due to lack of volume.
> > > Most of the time. It just requires a new cogged timing drive belt. That Jim
> > > K at Applied has for $8. On most coaches. That cogged belt can be retimed
> > > in place. The original compressor is very simple to rebuild. Jim K also has
> > > that kit. If you know what a screw driver is. You can do it. There was an
> > > air filter in the original unit. That it's remains needs to be cleaned out.
> > > ( That could be your compressor issue.)Then you can install a simple
> > > external air filter. Seems to me. That it's simpler/cheaper to simply
> > > service what you have. Then to find a way to mount a replacement compressor.
> > > Bob Dunahugh
> > > 78 Royale since 2003
> > > _______________________________________________
> > > GMCnet mailing list
> > > Unsubscribe or Change List Options:
> > > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> > >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

--
C. Boyd
76 Crestmont
East Tennessee

 

[Jim Hupy]

If he does have an EL I then what I said does not apply. But, I could have
sworn that the original picture that I looked at had two compressors,
although one was different than the other. I just thought that "little
Terry Tinker" had been mucking about and improvised a different compressor
arrangement.
Jim Hupy
Salem, Oregon

On Fri, Jul 31, 2020, 7:45 AM Charles Boyd via Gmclist <

> http://www.gmcmhphotos.com/photos/data/7314/medium/Leaking_valve.jpg
>
>
>
>

> > Sir, according to the picture he showed me of the leveling valve it is
> a Electro level 1.
> >
> >
> >
> >

> > > I believe that he has an EL II system. That one has 2 smaller
> compressors
> > > that as far as I know, there is not a rebuild kit available. These
> > > compressors slooowww dowwwnnn after time because their permanent
> alnico
> > > magnets lose their field strength. There may be a fix for those
> motors, but
> > > I personally don't know of one. Because those compressor heads also
> contain
> > > some of the solenoids that the EL II system uses, simple replacement of
> > > them with VIAIR or similar compressors won't work. There are some
> junkyard
> > > replacements that will work, but they are scarce. So, that leaves few
> > > options. Check with Jim K and other vendors. They may have a fix that
> will
> > > work.
> > > Jim Hupy
> > > Salem, Oregon
> > >
> > > On Fri, Jul 31, 2020, 7:02 AM Bob Dunahugh via Gmclist <

> > >
> > > > I hear of the original compressors being replaced due to lack of
> volume.
> > > > Most of the time. It just requires a new cogged timing drive belt.
> That Jim
> > > > K at Applied has for $8. On most coaches. That cogged belt can be
> retimed
> > > > in place. The original compressor is very simple to rebuild. Jim K
> also has
> > > > that kit. If you know what a screw driver is. You can do it. There
> was an
> > > > air filter in the original unit. That it's remains needs to be
> cleaned out.
> > > > ( That could be your compressor issue.)Then you can install a simple
> > > > external air filter. Seems to me. That it's simpler/cheaper to
> simply
> > > > service what you have. Then to find a way to mount a replacement
> compressor.
> > > > Bob Dunahugh
> > > > 78 Royale since 2003
> > > > _______________________________________________
> > > > GMCnet mailing list
> > > > Unsubscribe or Change List Options:
> > > > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> > > >
> > > _______________________________________________
> > > GMCnet mailing list
> > > Unsubscribe or Change List Options:
> > > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> --
> C. Boyd
> 76 Crestmont
> East Tennessee
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[charles boyd]

Sir, well understood as there was a “hijacked post” in the midst from a different poster with a different question about his own new to him
coach. It was a cobbled up mess if I remember correctly as I couldn’t figure it out either. While a different system could be used on each side
and they share the same type relays it’s the different leveling valves wiring that I haven grasped?

> If he does have an EL I then what I said does not apply. But, I could have
> sworn that the original picture that I looked at had two compressors,
> although one was different than the other. I just thought that "little
> Terry Tinker" had been mucking about and improvised a different compressor
> arrangement.
> Jim Hupy
> Salem, Oregon
>
> On Fri, Jul 31, 2020, 7:45 AM Charles Boyd via Gmclist <

>
> > http://www.gmcmhphotos.com/photos/data/7314/medium/Leaking_valve.jpg
> >
> >
> >
> >

> >> Sir, according to the picture he showed me of the leveling valve it is
> > a Electro level 1.
> >>
> >>
> >>
> >>

> >>> I believe that he has an EL II system. That one has 2 smaller
> > compressors
> >>> that as far as I know, there is not a rebuild kit available. These
> >>> compressors slooowww dowwwnnn after time because their permanent
> > alnico
> >>> magnets lose their field strength. There may be a fix for those
> > motors, but
> >>> I personally don't know of one. Because those compressor heads also
> > contain
> >>> some of the solenoids that the EL II system uses, simple replacement of
> >>> them with VIAIR or similar compressors won't work. There are some
> > junkyard
> >>> replacements that will work, but they are scarce. So, that leaves few
> >>> options. Check with Jim K and other vendors. They may have a fix that
> > will
> >>> work.
> >>> Jim Hupy
> >>> Salem, Oregon
> >>>

> >>>
> >>>> I hear of the original compressors being replaced due to lack of
> > volume.
> >>>> Most of the time. It just requires a new cogged timing drive belt.
> > That Jim
> >>>> K at Applied has for $8. On most coaches. That cogged belt can be
> > retimed
> >>>> in place. The original compressor is very simple to rebuild. Jim K
> > also has
> >>>> that kit. If you know what a screw driver is. You can do it. There
> > was an
> >>>> air filter in the original unit. That it's remains needs to be
> > cleaned out.
> >>>> ( That could be your compressor issue.)Then you can install a simple
> >>>> external air filter. Seems to me. That it's simpler/cheaper to
> > simply
> >>>> service what you have. Then to find a way to mount a replacement
> > compressor.
> >>>> Bob Dunahugh
> >>>> 78 Royale since 2003
> >>>> _______________________________________________
> >>>> GMCnet mailing list
> >>>> Unsubscribe or Change List Options:
> >>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >>>>
> >>> _______________________________________________
> >>> GMCnet mailing list
> >>> Unsubscribe or Change List Options:
> >>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
> > --
> > C. Boyd
> > 76 Crestmont
> > East Tennessee
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

--
C. Boyd
76 Crestmont
East Tennessee

 

[Jim Hupy]

I wondered if something like that happened.
Jim Hupy
Salem, Oregon

On Fri, Jul 31, 2020, 9:10 AM Charles Boyd via Gmclist <

> Sir, well understood as there was a “hijacked post” in the midst from a
> different poster with a different question about his own new to him
> coach. It was a cobbled up mess if I remember correctly as I couldn’t
> figure it out either. While a different system could be used on each side
> and they share the same type relays it’s the different leveling valves
> wiring that I haven grasped?
>
>
>
>

> > If he does have an EL I then what I said does not apply. But, I could
> have
> > sworn that the original picture that I looked at had two compressors,
> > although one was different than the other. I just thought that "little
> > Terry Tinker" had been mucking about and improvised a different
> compressor
> > arrangement.
> > Jim Hupy
> > Salem, Oregon
> >
> > On Fri, Jul 31, 2020, 7:45 AM Charles Boyd via Gmclist <

> >
> > > http://www.gmcmhphotos.com/photos/data/7314/medium/Leaking_valve.jpg
> > >
> > >
> > >
> > >

> > >> Sir, according to the picture he showed me of the leveling valve it
> is
> > > a Electro level 1.
> > >>
> > >>
> > >>
> > >>

> > >>> I believe that he has an EL II system. That one has 2 smaller
> > > compressors
> > >>> that as far as I know, there is not a rebuild kit available. These
> > >>> compressors slooowww dowwwnnn after time because their permanent
> > > alnico
> > >>> magnets lose their field strength. There may be a fix for those
> > > motors, but
> > >>> I personally don't know of one. Because those compressor heads also
> > > contain
> > >>> some of the solenoids that the EL II system uses, simple
> replacement of
> > >>> them with VIAIR or similar compressors won't work. There are some
> > > junkyard
> > >>> replacements that will work, but they are scarce. So, that leaves
> few
> > >>> options. Check with Jim K and other vendors. They may have a fix
> that
> > > will
> > >>> work.
> > >>> Jim Hupy
> > >>> Salem, Oregon
> > >>>
> > >>> On Fri, Jul 31, 2020, 7:02 AM Bob Dunahugh via Gmclist >>

> > >>>
> > >>>> I hear of the original compressors being replaced due to lack of
> > > volume.
> > >>>> Most of the time. It just requires a new cogged timing drive belt.
> > > That Jim
> > >>>> K at Applied has for $8. On most coaches. That cogged belt can be
> > > retimed
> > >>>> in place. The original compressor is very simple to rebuild. Jim K
> > > also has
> > >>>> that kit. If you know what a screw driver is. You can do it. There
> > > was an
> > >>>> air filter in the original unit. That it's remains needs to be
> > > cleaned out.
> > >>>> ( That could be your compressor issue.)Then you can install a
> simple
> > >>>> external air filter. Seems to me. That it's simpler/cheaper to
> > > simply
> > >>>> service what you have. Then to find a way to mount a replacement
> > > compressor.
> > >>>> Bob Dunahugh
> > >>>> 78 Royale since 2003
> > >>>> _______________________________________________
> > >>>> GMCnet mailing list
> > >>>> Unsubscribe or Change List Options:
> > >>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> > >>>>
> > >>> _______________________________________________
> > >>> GMCnet mailing list
> > >>> Unsubscribe or Change List Options:
> > >>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> > >
> > > --
> > > C. Boyd
> > > 76 Crestmont
> > > East Tennessee
> > >
> > > _______________________________________________
> > > GMCnet mailing list
> > > Unsubscribe or Change List Options:
> > > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> > >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> C. Boyd
> 76 Crestmont
> East Tennessee
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[Bob Dunahugh]

The GMC that we now have. Has the electronically controlled, 2 compressor system. That GM put in late 78 coaches. One compressor for each side. Very simple. No tank. Just one tube from each compressor. To each bag. Thus just 4 fittings.
For those that have the electronic system. Both compressors also have air filters in the compressor head. That must be serviced.
Our other GMC that we had. Had that V twin Dana. compressor. With all those fittings/parts. Put lots of belts on compressors. At GMCMI events.
Bob Dunahugh

________________________________
From: Bob Dunahugh
Sent: Friday, July 31, 2020 9:01 AM
To: gmclist
Subject: Air ride compressors

I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
Bob Dunahugh
78 Royale since 2003

 

[dave stragand1]

Bob, what is the process for servicing the compressor head air filters?

>
> The GMC that we now have. Has the electronically controlled, 2 compressor system. That GM put in late 78 coaches. One compressor for each side. Very simple. No tank. Just one tube from each compressor. To each bag. Thus just 4 fittings.
> For those that have the electronic system. Both compressors also have air filters in the compressor head. That must be serviced.
> Our other GMC that we had. Had that V twin Dana. compressor. With all those fittings/parts. Put lots of belts on compressors. At GMCMI events.
> Bob Dunahugh
>
> ________________________________
> From: Bob Dunahugh
> Sent: Friday, July 31, 2020 9:01 AM
> To: gmclist
> Subject: Air ride compressors
>
> I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
> Bob Dunahugh
> 78 Royale since 2003
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[powwerjon]

Do You have the X-7525A if you have the Reproduced Cinnabar manual go too Section 4, page 17,Compressor overhaul. That section covers the Dana and the Brown compressor.

The supplement X-7725 covers the Electro Level II system and compressor. Starts about 4B-2

You can also find these on Bdub’s site and on the GMCMI site.

http://www.bdub.net/factory-manuals.html

J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan

>
> Bob, what is the process for servicing the compressor head air filters?
>

>>
>> The GMC that we now have. Has the electronically controlled, 2 compressor system. That GM put in late 78 coaches. One compressor for each side. Very simple. No tank. Just one tube from each compressor. To each bag. Thus just 4 fittings.
>> For those that have the electronic system. Both compressors also have air filters in the compressor head. That must be serviced.
>> Our other GMC that we had. Had that V twin Dana. compressor. With all those fittings/parts. Put lots of belts on compressors. At GMCMI events.
>> Bob Dunahugh
>>
>> ________________________________
>> From: Bob Dunahugh
>> Sent: Friday, July 31, 2020 9:01 AM
>> To: gmclist
>> Subject: Air ride compressors
>>
>> I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
>> Bob Dunahugh
>> 78 Royale since 2003
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[powwerjon]

You can find these compressor at the Men’s mall. I harvested a number of them out of Mid 70’s to Mid 80’s Full size Cad’s with the air ride rear suspension. The compressor is typically located under the hood on drivers side near the front. Be sure to take as much of the 1/8” air line that is connected to the compressor. Cheap and I test them when I get them home and almost all are good volume producers. Get the wiring harness too!

JR Wright

>
> Bob, what is the process for servicing the compressor head air filters?
>

>>
>> The GMC that we now have. Has the electronically controlled, 2 compressor system. That GM put in late 78 coaches. One compressor for each side. Very simple. No tank. Just one tube from each compressor. To each bag. Thus just 4 fittings.
>> For those that have the electronic system. Both compressors also have air filters in the compressor head. That must be serviced.
>> Our other GMC that we had. Had that V twin Dana. compressor. With all those fittings/parts. Put lots of belts on compressors. At GMCMI events.
>> Bob Dunahugh
>>
>> ________________________________
>> From: Bob Dunahugh
>> Sent: Friday, July 31, 2020 9:01 AM
>> To: gmclist
>> Subject: Air ride compressors
>>
>> I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
>> Bob Dunahugh
>> 78 Royale since 2003
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[Bob Dunahugh]

To service the air filters ( NOTE: 2 filters) in the early V twin. What is the remains of those filters. Is in the crank case. On the backside. Behind the 2-round white disc. Remove the retaining wire. Then pull the disc out. The remains of the filters. Will be all around in there. Including in the valves. I put together a replacement air filter. I put 2 short pieces of hose over the air intakes. To a Y fitting. Then a very short hose. To a 1/4 inch clear, in line gas filter.
As to the late 78 compressors. The filters are in the heads of each compressor.. A long with the down solenoid air valves. I just made a new filter out of some foam material.
Both compressor types are simple to service. Have any questions. My cell is 319-521-4891 Iowa CDT Bob Dunahugh

________________________________
From: Bob Dunahugh
Sent: Friday, July 31, 2020 11:51 AM
To: gmclist
Subject: RE: Air ride compressors

The GMC that we now have. Has the electronically controlled, 2 compressor system. That GM put in late 78 coaches. One compressor for each side. Very simple. No tank. Just one tube from each compressor. To each bag. Thus just 4 fittings.
For those that have the electronic system. Both compressors also have air filters in the compressor head. That must be serviced.
Our other GMC that we had. Had that V twin Dana. compressor. With all those fittings/parts. Put lots of belts on compressors. At GMCMI events.
Bob Dunahugh

________________________________
From: Bob Dunahugh
Sent: Friday, July 31, 2020 9:01 AM
To: gmclist
Subject: Air ride compressors

I hear of the original compressors being replaced due to lack of volume. Most of the time. It just requires a new cogged timing drive belt. That Jim K at Applied has for $8. On most coaches. That cogged belt can be retimed in place. The original compressor is very simple to rebuild. Jim K also has that kit. If you know what a screw driver is. You can do it. There was an air filter in the original unit. That it's remains needs to be cleaned out. ( That could be your compressor issue.)Then you can install a simple external air filter. Seems to me. That it's simpler/cheaper to simply service what you have. Then to find a way to mount a replacement compressor.
Bob Dunahugh
78 Royale since 2003