Home » Public Forums » GMCnet » Macerator install on 73, 23 ft coach
| Macerator install on 73, 23 ft coach [message #122540] |
Wed, 20 April 2011 20:32  |
Dennis S
Messages: 3046
Registered: November 2005
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Having read all the comments about macerators (and watched the movie RV) I didn't think I wanted to begin my GMC experience without one --- so here is my effort.
Special recognition to Duane Simmons for his GMC West technical article on all the things a GMC owner should know which included a diagram and parts list for a macerator installation. I borrowed heavily from his plan.
The fixed discharge hose extends 9 feet from the side of the coach -- but with a thread to garden hose adapter I can add a length of garden hose if required.
http://www.gmcmhphotos.com/photos/showgallery.php?cat=5767
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Wed, 20 April 2011 20:36] Report message to a moderator |
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122543 is a reply to message #122540] |
Wed, 20 April 2011 20:50  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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Dennis,
Nice job!
You might want to get another section of the black hose which I assume is 1"
ID that way if you have to extend it you won't wind up with the reduced ID
of garden hose.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dennis Sexton
Sent: Wednesday, April 20, 2011 8:33 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Macerator install on 73, 23 ft coach
The fixed discharge hose ends 9 feet from the side of the coach -- but with
a thread to garden hose adapter I can add a lenght of garden hose if
required.
Dennis
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122544 is a reply to message #122543] |
Wed, 20 April 2011 21:13 |
Dennis S
Messages: 3046
Registered: November 2005
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| Robert Mueller wrote on Wed, 20 April 2011 20:50 |
Dennis,
Nice job!
You might want to get another section of the black hose which I assume is 1"
ID that way if you have to extend it you won't wind up with the reduced ID
of garden hose.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message----
Subject: [GMCnet] Macerator install on 73, 23 ft coach
The fixed discharge hose extends 9 feet from the side of the coach -- but with
a thread to garden hose adapter I can add a length of garden hose if
required.
Dennis
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Rob,
Thank you.
From previous articles and photo albums I understood quite a few owners use a 3/4 inch garden hose for their main discharge hose --
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122547 is a reply to message #122544] |
Wed, 20 April 2011 21:36 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Dennis,
That is correct and I'm sure they work fine, however, 1" ID is mo betta as
it has lower pressure drop for the same length. ;-)
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dennis Sexton
Sent: Wednesday, April 20, 2011 9:14 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Macerator install on 73, 23 ft coach
Rob,
Thank you.
From previous articles and photo albums I understood quite a few owners use
a 3/4 inch garden hose for their main discharge hose --
Dennis
--
Dennis S
73 Painted Desert 230
Germantown, TN
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122548 is a reply to message #122547] |
Wed, 20 April 2011 21:44 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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| Robert Mueller wrote on Wed, 20 April 2011 21:36 |
Dennis,
That is correct and I'm sure they work fine, however, 1" ID is mo betta as
it has lower pressure drop for the same length. 
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dennis Sexton
Sent: Wednesday, April 20, 2011 9:14 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Macerator install on 73, 23 ft coach
Rob,
Thank you.
From previous articles and photo albums I understood quite a few owners use
a 3/4 inch garden hose for their main discharge hose --
Dennis
--
Dennis S
73 Painted Desert 230
Germantown, TN
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Rob,
Agreed on the 1 inch ID -- maybe I will look for fittings to use the extra 6 feet I had to cut off -- and try to find an elegant way to store it beside the Onan.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122559 is a reply to message #122548] |
Wed, 20 April 2011 22:10 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Nah ----- all the regular people use 3/4
And in 100 years no one will ever know:)
Gene
FREE WIFI
On Apr 20, 2011, at 7:44 PM, Dennis Sexton <dennisfsexton@aol.com> wrote:
>
>
> Robert Mueller wrote on Wed, 20 April 2011 21:36
>> Dennis,
>>
>> That is correct and I'm sure they work fine, however, 1" ID is mo betta as
>> it has lower pressure drop for the same length. ;)
>>
>> Regards,
>> Rob M.
>> USAussie - Downunder
>> AUS '75 Avion - The Blue Streak TZE365V100428
>> USA '75 Avion - Double Trouble TZE365V100426
>>
>>
>> -----Original Message-----
>> From: gmclist-bounces@temp.gmcnet.org
>> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dennis Sexton
>> Sent: Wednesday, April 20, 2011 9:14 PM
>> To: gmclist@temp.gmcnet.org
>> Subject: Re: [GMCnet] Macerator install on 73, 23 ft coach
>>
>> Rob,
>>
>> Thank you.
>>
>> From previous articles and photo albums I understood quite a few owners use
>> a 3/4 inch garden hose for their main discharge hose --
>>
>> Dennis
>> --
>> Dennis S
>> 73 Painted Desert 230
>> Germantown, TN
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> Rob,
> Agreed on the 1 inch ID -- maybe I will look for fittings to use the extra 6 feet I had to cut off -- and try to find an elegant way to store it beside the Onan.
>
> Dennis
> --
> Dennis S
> 73 Painted Desert 230
> Germantown, TN
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122561 is a reply to message #122559] |
Wed, 20 April 2011 22:15 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Gene,
Correct!
Unfortunately as an anally retentive perfectionist I noted that the outlet
of the macerator was 1" so that's the size of hose I HAD TO HAVE!
Jeez, I am my own worst enemy! ;-)
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of mr.erfisher@gmail.com
Sent: Wednesday, April 20, 2011 10:15 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Macerator install on 73, 23 ft coach
Nah ----- all the regular people use 3/4
And in 100 years no one will ever know:)
Gene
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GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122562 is a reply to message #122548] |
Wed, 20 April 2011 22:21 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Dennis,
Here's a picture of the macerator hose storage tube on Double Trouble, it
runs down inside the drivers side frame rail. This is the way Jim B does it.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=28381
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dennis Sexton
Sent: Wednesday, April 20, 2011 9:45 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Macerator install on 73, 23 ft coach
Rob,
Agreed on the 1 inch ID -- maybe I will look for fittings to use the extra 6
feet I had to cut off -- and try to find an elegant way to store it beside
the Onan.
Dennis
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GMCnet mailing list
Unsubscribe or Change List Options:
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: Macerator install on 73, 23 ft coach [message #122574 is a reply to message #122540] |
Thu, 21 April 2011 02:34 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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Nice clean installation. Nothing that isn't needed. (I wish it would fit under a Birch.) Two question/comments.
1. How far under your coach is your 3 inch dump? It looks like it would be a bit hard to use... not wanting to crawl on the ground at a dump station. (I know it would be too far under on a 26foot... and this is a 23. Also this is only a back-up method of dumping.)
2. Is the discharge hose smooth on the inside? If the outside shape is reflected on the inside...
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: Macerator install on 73, 23 ft coach [message #122592 is a reply to message #122574] |
Thu, 21 April 2011 08:47 |
Dennis S
Messages: 3046
Registered: November 2005
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Nice clean installation. Nothing that isn't needed. (I wish it would fit under a Birch.) Two question/comments.
1. How far under your coach is your 3 inch dump? It looks like it would be a bit hard to use... not wanting to crawl on the ground at a dump station. (I know it would be too far under on a 26foot... and this is a 23. Also this is only a back-up method of dumping.)
2. Is the discharge hose smooth on the inside? If the outside shape is reflected on the inside...[/quote]
Mike,
On my early 73 coach the original 3 inch discharge hose from the Thetford valve is a 3 foot stiff rubber hose, the end of which is held in a bracket under the rear bumper and lowered for dumping. The Valterra valve is about 18 inches behind the bumper -- and should only be an emergency hookup. May not carry a 3 inch discharge hose but just buy one at Walmart if ever needed.
The 1 inch macerator discharge hose is smooth on the inside, ribbed on the outside to prevent kinking. I bought it at Lowes in the fish pond supplies -- used for continuous pumping of pond water.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122594 is a reply to message #122562] |
Thu, 21 April 2011 08:54 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| Robert Mueller wrote on Wed, 20 April 2011 22:21 |
Dennis,
Here's a picture of the macerator hose storage tube on Double Trouble, it
runs down inside the drivers side frame rail. This is the way Jim B does it.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=28381
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
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Rob,
Thank you for the photo link. I have the same storage scabbard made from conduit but on my 23 it only allowed 9 feet before it came to the rear fuel tank elbow. Not wanting any potential rubbing problem I stopped just short. I will look for a good storage spot for a discharge hose extension.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Macerator install on 73, 23 ft coach [message #122614 is a reply to message #122540] |
Thu, 21 April 2011 11:02 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Nice installation, Dennis. My Macerator was installed by the PO, and works fine as is. However, there are some things I think could be improved upon. Someday...when I decide to tackle it, I will use your very well composed photo essay as an example of how to do the job right.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122615 is a reply to message #122561] |
Thu, 21 April 2011 11:11 |
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Also of the German persuasion, eh Robert?
| Robert Mueller wrote on Wed, 20 April 2011 22:15 |
Gene,
Correct!
Unfortunately as an anally retentive perfectionist I noted that the outlet
of the macerator was 1" so that's the size of hose I HAD TO HAVE!
Jeez, I am my own worst enemy!
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of mr.erfisher@gmail.com
Sent: Wednesday, April 20, 2011 10:15 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Macerator install on 73, 23 ft coach
Nah ----- all the regular people use 3/4
And in 100 years no one will ever know:)
Gene
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Unsubscribe or Change List Options:
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73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: [GMCnet] Macerator install on 73, 23 ft coach [message #122622 is a reply to message #122621] |
Thu, 21 April 2011 11:55 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| comcast wrote on Thu, 21 April 2011 11:48 |
Dennis,
I have a long length of the flexible storage hose that I used. I was
able to get it all the way to the front for a long dump hose. You're
welcome to it if we can get together along the way.
Roger Black
77 Birchaven
Burns, Tn
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Roger,
Thanks for the offer. My coach also has the air lines running through the frame rail at the same point as the fuel tank elbow so seems unlikely I could make more room for a hose storage pipe.
Denny Allen only included 10 feet of hose in his basic kit so I am thinking I will be ok.
Regards,
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Macerator install on 73, 23 ft coach [message #122623 is a reply to message #122614] |
Thu, 21 April 2011 11:59 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| Carl S. wrote on Thu, 21 April 2011 11:02 |
Nice installation, Dennis. My Macerator was installed by the PO, and works fine as is. However, there are some things I think could be improved upon. Someday...when I decide to tackle it, I will use your very well composed photo essay as an example of how to do the job right.
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Carl,
Thank you. I can understand and appreciate -- almost every project I work on, I find things I would do a little different -- so I just go ahead and do them twice!
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Thu, 21 April 2011 12:00] Report message to a moderator |
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| Re: Macerator install on 73, 23 ft coach [message #122633 is a reply to message #122623] |
Thu, 21 April 2011 13:38 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Very pretty work. I like the protected position for the macerator pump. Wont be knocking that one off. On my next coach (next month), it has a macerator installed, but I'll be freely copying your installation. About the only change I would make, on my previous coach, the P.P.O. (Bill Harvey, GMC Western States) put the pump switch in a location where you could reach it without opening the Gen door. You just reached into the cooling vents. I do like the circuit breaker.
Tom Phipps,
Coach in less than 30 days.
2012 Phoenix Cruiser model 2552
KA4CSG
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