Blade on toilet cassette stuck closed

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Blade on toilet cassette stuck closed

Post by Empyrean on Tue Jun 20, 2017 11:27 am

I was giving my loo a really good clean and I seem to have done something to the blade which opens and seals when you use it.

Does anybody have any ideas about what I can do?

I'm off on another trip on Saturday so am desperate for a solution!

Thanks

Chris
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Re: Blade on toilet cassette stuck closed

Post by chrisk on Tue Jun 20, 2017 11:31 am

Is the cassette in correctly
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Re: Blade on toilet cassette stuck closed

Post by Empyrean on Tue Jun 20, 2017 11:34 am

Yes. I thought that at first. The blade looks as if it's slightly wonky - as if it's kind of come of a "runner". Hope that makes sense!
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Re: Blade on toilet cassette stuck closed

Post by chrisk on Tue Jun 20, 2017 11:41 am

Empyrean wrote:Yes. I thought that at first. The blade looks as if it's slightly wonky - as if it's kind of come of a "runner". Hope that makes sense!


 I'm new to motor homing so thats about all i know sure another member with more experience will help you out.
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Re: Blade on toilet cassette stuck closed

Post by Bartfarst on Tue Jun 20, 2017 11:45 am

Chris,

My assumption is that you have a Thetford C2 cassette loo: please confirm.

It may be that the mechanism which opens the 'blade' has been damaged, or that something has stuck the blade to the underside of the main seal. Have you used an aggressive loo cleaner which might have damaged the polymer seal or blade? As far as I know, the blade mechanism is wholly inside the cassette tank, which is a plastic welded assembly, and therefore once damaged cannot be exchanged.

Be aware that there are two types of C2 blade mechanism. The earlier has the blade slide over horizontally with a tendency for (i) the action to be stiff and (ii) for the seal (P/N 16175 I think) to become deformed and less effective. In the later units, the blade comes over then up against the seal - much better in my view.

My 1995 Harmony had the first style I and about five years ago, by which time other seals had started to fail, I replaced the whole cassette with a "Refresh Kit", for example
https://www.sherwoodleisure.co.uk/thetford-c234-toilet-fresh-up-kit-left-hand?gclid=CjwKEAjwj6PKBRCAy9-07PeTtGgSJAC1P9xG30npa82zYT-mX_6Lp72svHTP0jdMZ1NmGTxNfOP6rhoCKg7w_wcB

I paid around £80 from Towsure (now about £140 on-line) and I reckon it was money well spent. I even sold the new toilet seat (white rather than cream) on eBay to offset the cost.

Hope this helps,

Bartfarst
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Re: Blade on toilet cassette stuck closed

Post by Empyrean on Tue Jun 20, 2017 12:13 pm

It's a Thetford C3.

I've just downloaded an instruction sheet from Thetford which shows you how to replace the blade so I might get a screwdriver out tomorrow!

Failing all, I'll buy a new cassette - at least it will be lovely and fresh!

Thanks for your advice
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Re: Blade on toilet cassette stuck closed

Post by Gromit on Tue Jun 20, 2017 12:29 pm

Further to what Chrisk said, when you put the cassette back in, did you make sure the knob with the yellow stripe was turned as shown in this picture? That is, did you close the blade firmly before putting the cassette back in?

If you didn't, it may well have ridden over the internal slot into which it should slide, and it certainly won't work then. You can probably tell when you try to remove the cassette, and find it's stuck fast.

Don't be too brutal, but if this is your problem you may be able to force the cassette out without breaking anything.

May not help, but worth remembering to close the blade firmly after adding the blue stuff and putting the cassette back in.


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Re: Blade on toilet cassette stuck closed

Post by Bartfarst on Tue Jun 20, 2017 1:06 pm

Good point Dave. However I'm pretty sure that there is an 'interlock' on the bench part of the loo which prevents insertion of the cassette with the blade knob in any position other than fully closed.

Your photo affirms that if indeed the blade mechanism can be worked on, then one needs to work on it from inside the tank having opened the blade which, if it's stuck closed, may be a non-starter. Then you've got the small matter of the unpleasant environment in which you have to work presumably using tubby screwdrivers blind back up against the top surface of the cassette.

For the sake of a hundred notes in my view it has to be the freshen-up route, particularly as the air admittance button and vent valve will probably start to leak soon anyway. Further on mine the 'sender' for the fill level gauge inside the cassette also failed.

If dumping the old cassette, I'd also recommend you clean and retain the big yellow fill cap and carry it with you as a spare. The day may come when you drop it into some dark abyss from where you have no desire to effect its recovery!


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Re: Blade on toilet cassette stuck closed

Post by Gromit on Tue Jun 20, 2017 2:08 pm

Very diplomatically put Bart. up!

Point taken however, and my tugger mate did exactly that when his cassette packed in. Even with the Marigolds he didn't fancy firtling around inside - and although I do a lot of maintenance for him I wasn't about to volunteer that time!!! uncertain    yikes    surrender

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Re: Blade on toilet cassette stuck closed

Post by Empyrean on Wed Jun 21, 2017 12:52 pm

Thank you everybody. I think I'm going for a new cassette as suggested. And the tip about keeping the cap is a good one as I do have a habit of putting things down in the wrong place!

Chris
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Re: Blade on toilet cassette stuck closed

Post by Empyrean on Fri Jun 23, 2017 3:17 pm

Just a quick update

I'm now the proud owner of a sparkling new cassette. Fantastic service from Jacksons - ordered Wednesday afternoon and delivered today.

Thanks for your help and particularly for the suggestion of a new cassette - my new one has wheels!!

Chris
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Re: Blade on toilet cassette stuck closed

Post by Bartfarst on Fri Jun 23, 2017 6:55 pm

Chris,

Well that's interesting: I'm assuming the cassette you have received is from a C4. Please can someone confirm that a C4 has wheels?

Further Chris, have you actually tried it in your van yet, and does it fit OK?

Although I changed mine for a 'freshen-up' kit, I might consider going for the wheeled option if it works. I suffer from occasional bad back and chronic elbow issues so lugging a full cassette is no joke these days!


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Re: Blade on toilet cassette stuck closed

Post by boxerman on Fri Jun 23, 2017 7:22 pm

Bartfarst wrote: I suffer from occasional bad back and chronic elbow issues so lugging a full cassette is no joke these days!
Bartfarst
That's why I always take my fishing trolley smile!

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Re: Blade on toilet cassette stuck closed

Post by Bartfarst on Fri Jun 23, 2017 9:13 pm

Frank,

Fishing trolley - good idea, but no room in the van!

Stuart
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Re: Blade on toilet cassette stuck closed

Post by Sue68 on Fri Jun 23, 2017 9:29 pm

Maplins were selling a lightweight folding trolly. It folds flat so would fit somewhere. It was a godsend when we moved house.

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Re: Blade on toilet cassette stuck closed

Post by PLOUGHLIN on Fri Jun 23, 2017 10:33 pm


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Re: Blade on toilet cassette stuck closed

Post by boxerman on Sat Jun 24, 2017 8:26 am

Bartfarst wrote:Frank,

Fishing trolley - good idea, but no room in the van!

Stuart
Mine travels folded and upright against the back doors, with a velco strap around the big door handle to keep it upright.

Frank
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Re: Blade on toilet cassette stuck closed

Post by Paramedic on Sat Jun 24, 2017 8:42 am

Bartfarst wrote:Chris,

Although I changed mine for a 'freshen-up' kit, I might consider going for the wheeled option if it works. I suffer from occasional bad back and chronic elbow issues so lugging a full cassette is no joke these days!


Bartfarst
If possible, much less expensive to obtain an old shopping trolley and remove the loading bag. Or buy a new one for about £15 which is still a fraction of the cost of a new cassette. Simply use a bungee to hold it in place.

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Re: Blade on toilet cassette stuck closed

Post by Paramedic on Sat Jun 24, 2017 12:52 pm

Bartfarst wrote:

Although I changed mine for a 'freshen-up' kit, I might consider going for the wheeled option if it works. I suffer from occasional bad back and chronic elbow issues so lugging a full cassette is no joke these days!
Bartfarst
Further to my last, just seen in Robert Dyas, what is described as a 'festival trolley'. Very lightweight, compact with slide up down handle, black at just £9.99. Like a shopping trolley without the bag. Sorry, perhaps Dyas not in your part of UK but something similar available from internet?


Last edited by Paramedic on Sat Jun 24, 2017 12:56 pm; edited 1 time in total (Reason for editing : Add last sentence)

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Re: Blade on toilet cassette stuck closed

Post by Bartfarst on Sat Jun 24, 2017 8:24 pm

Thanks Paramedic: I'll investigate!

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Re: Blade on toilet cassette stuck closed

Post by bikeralw on Sat Jun 24, 2017 9:44 pm

Is it true that the new wheeled cassette has reduced capacity? An important consideration when touring off the beaten track for days on end..
Al
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Re: Blade on toilet cassette stuck closed

Post by Bartfarst on Sat Jun 24, 2017 10:04 pm

Al, it looks to me like it does: the wheels and handle have to be accommodated into the envelope of the cassette somehow.

Looking at it, if the 'wheel arch' goes all the way across the tank then I'd estimate a 5 - 8% loss. This is likely in my view as the wheels appear to be well inboard. Perhaps someone with such a cassette can advise on this?

https://www.thetford-europe.com/product/toilet-fresh-up-set/


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Re: Blade on toilet cassette stuck closed

Post by Empyrean on Wed Jun 28, 2017 2:12 pm

Apologies for my silence I've been on the road trying out my new loo in the process!

As somebody wrote earlier, all the new cassettes now have wheels - I'm delighted with my wheels and any loss of capacity will just have to be accommodated...

Chris
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Re: Blade on toilet cassette stuck closed

Post by Gromit on Wed Jun 28, 2017 2:22 pm

Empyrean wrote:Apologies for my silence I've been on the road trying out my new loo in the process!
Chris
How did you manage to steer?
Ah yes, I know. You set the van on cruise control. Obvious innit!!  lol4

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Re: Blade on toilet cassette stuck closed

Post by Empyrean on Thu Jun 29, 2017 10:05 am

Ha ha! There's an idea - a commode driving seat. You could be on to something...
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