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12-16-2022, 09:46 AM
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#1
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Established Member
Join Date: Apr 2021
Location: Turner Valley
Posts: 16
M.O.C. #28590
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Thetford Toilet
I have a Aqua Magic Style II Thetford Toilet in our RV and I am having issues with the waste ball closing after releasing the pedal. It closes part way, but not all the way, so the water keeps running into the holding tank. Could be a major issue.I have replaced the blade seal and have been using silicone water proof grease on the ball. The grease helps but after a couple days it starts acting up again. Does the water pressure have anything to do with assisting the ball to close? Has anyone else had this issue, and if so what was done to fix this issue?
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12-16-2022, 10:25 AM
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#2
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,702
M.O.C. #12947
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Fixed our Thetford toilet by depositing it in a dumpster and installing a Dometic 310 toilet.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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12-16-2022, 11:25 AM
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#3
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Montana Fan
Join Date: Nov 2010
Location: Chatsworth
Posts: 468
M.O.C. #10933
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I know others have had issues with the Thetford, but ours has worked well since new in 2016. It sometimes goes through short periods when it won,t hold water but a cleaning with a toitet brush in the hole with the ball open usually cures that. I had the same issue in our last Montana that had a Dometic in it. We use the trailer about 5 months a year.
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Gayle and John Devall
2017 Legacy 3720 IS and Disc brakes
1120 watts solar panels and 300 AH lithium batteries
2011 Ford f350 srw long box Lariat with B&W Patriot hitch. Residential Fridge.
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12-16-2022, 01:24 PM
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#4
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,701
M.O.C. #24086
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Good video if you have to replace the pedal assembly.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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12-16-2022, 04:21 PM
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#5
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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On all three of our Montana's we replaced the Tetford with a Dometic and had no probems after that.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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12-16-2022, 06:42 PM
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#6
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,236
M.O.C. #30417
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Quote:
Originally Posted by rohrmann
Fixed our Thetford toilet by depositing it in a dumpster and installing a Dometic 310 toilet.
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Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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12-17-2022, 07:30 AM
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#7
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Montana Master
Join Date: Oct 2004
Location: Ore City Texas
Posts: 1,648
M.O.C. #2224
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We had a very similar problem with our Thetford so I will share my experience. The big difference is that our fifth-wheel is 15 years old and that problem only developed this past Summer. We are not full-timers but we have logged 111,500 miles in this trailer.
Since the Thetford had served well over 15 years and we likely will not have this trailer much longer, we just decided on a direct replacement. I ordered it from Amazon and did all the work myself. This is not a recommendation for anyone else, but it was the easiest and least expensive thing for me.
* by "direct replacement" I mean the exact model of Thetford that came with our trailer when we bought it new.
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12-18-2022, 02:52 PM
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#8
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Montana Fan
Join Date: Jan 2021
Location: Coloma, Wisconsin
Posts: 202
M.O.C. #28036
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Same, Thetford was one issue after another...replaced with Domestic 320 and happy again...
__________________
Chuck
2019 3121RL 35 ft., 2020 3500 Dodge Ram SRW, Cummins 6.7 HO, Air Bags - Air Lift BT Wireless Compressor, Coloma, Wisconsin
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