320 Cassette jammed

MarkAl
MarkAl Member Posts: 509
edited July 2024 in Heating/Plumbing & Winterizing
After a trip, I took the cassette out to clean and "something" happened and when I put it back in the cassette is now jammed inside. The sliding cover was slightly poking out and I thought maybe I had it in opposite. But I could pull it out when the cassette partially pulled out (before it stops). No I haven't been able to push it back in.  The handle inside was and is correctly positioned closed.  I've been sliding thin objects between the cassette top and the toilet bowl but I can't figure out what to do next. Thoughts or a link to a video?  I think the shutter/cover was not all the way in when I inserted the cassette? The shutter s/b captured and pulled open or closed when moving the cassette in and out.

Snohomish WA, 2015 Diesel Grand Cherokee
Sm@ll World: 2021 320S Boondock, 6V Pb-acid
Shunt, Roof & Remote solar & 30A DC-DC Chargers
managed by VE Smart Network

Comments

  • SLJ
    SLJ Member Posts: 652
    Check and see if the blade control knob on top of the cassette is parallel with the cassette. If not use a flat object to reach in and try to turn it.

     
    2021 T@B 320 S Boondock
    2025 KZ Sportsmen 130RD
    2025 Ford Ranger
    The Finger Lakes of New York
  • MarkAl
    MarkAl Member Posts: 509
    The knob is correct, it slides forward enough that the cassette can be pulled part way out.  BTW we did find this link that has a lot of repair videos from Thetford. Also a suggestion in chat information. We will try this tonight; I had pushed on the tank without any movement so I'm not hopeful. https://www.thetford-europe.com/gb/welcome-thetford-support/c400-series-cassette-toilet


    Snohomish WA, 2015 Diesel Grand Cherokee
    Sm@ll World: 2021 320S Boondock, 6V Pb-acid
    Shunt, Roof & Remote solar & 30A DC-DC Chargers
    managed by VE Smart Network
  • SLJ
    SLJ Member Posts: 652
    The only other thing I can think of is if you still have a cover on the storage compartment underneath that could have become dislodged and is somehow jamming the cassette.  I removed my cover and don't use it.
    2021 T@B 320 S Boondock
    2025 KZ Sportsmen 130RD
    2025 Ford Ranger
    The Finger Lakes of New York
  • Mobean
    Mobean Member Posts: 74
    I had same issue with the truly unnecessary cover for the storage compartment.  Once I finally wiggled the cassette loose, I had a bent cover.  Works just fine without it.  Don't think I would ever store anything under a toilet anyway.
    2021 320S BD
    2020 V6 Chevy Colorado
  • MarkAl
    MarkAl Member Posts: 509
    Thanks to @SLJ and @Mobean After verifying the rotating knob could not be straighter, and after pulling the cassette as far out as it could go, I pushed down mightily on the cassette inside and wife pulled less aggressively but hard and we got it out. No damage but will not use the lower plate anymore. Thanks everyone.

    Snohomish WA, 2015 Diesel Grand Cherokee
    Sm@ll World: 2021 320S Boondock, 6V Pb-acid
    Shunt, Roof & Remote solar & 30A DC-DC Chargers
    managed by VE Smart Network
  • Basil48192
    Basil48192 Member Posts: 437
    Glad you got it!  The first time I used it I found that the cover prevented the latch on the bottom of the cassette from locking into place.  I removed it and have not had a problem since.  
  • bjn2
    bjn2 Member Posts: 123
    @Basil48192 I'd like to confirm that this is the sliding cover you've removed. Thetford Toilet Part - C2C4C400 Cassette Sliding Cover Mid Grey
    Utah-based
    2023 T@B 320 S Boondock
  • MarkAl
    MarkAl Member Posts: 509
    This is the slide that came off when it jammed. It was not damaged but the plate I removed was a white plate over the depression under the cassette. I still use the gray plate. 
    Snohomish WA, 2015 Diesel Grand Cherokee
    Sm@ll World: 2021 320S Boondock, 6V Pb-acid
    Shunt, Roof & Remote solar & 30A DC-DC Chargers
    managed by VE Smart Network
  • Basil48192
    Basil48192 Member Posts: 437
    @bjn2.  No.  That has to stay in place (on top of the cassette).
    The plate I removed is the one described above by @MarkAl and shown in the first photo below.  It covers the recessed opening underneath the cassette (shown in the second photo below).

     
  • bjn2
    bjn2 Member Posts: 123
    @Basil48192 thanks so much for the photos and clarification. The existence of the panel and the compartment are new to me. Apparently this is a storage compartment and the one behind can house a filter. https://www.caravantalk.co.uk/community/topic/141840-what’s-this-secret-compartment-for/
    Utah-based
    2023 T@B 320 S Boondock
  • rfuss928
    rfuss928 Member Posts: 1,181
    I think it is where the vent plumbing connects (like seen to the rear of the cassette compartment floor) if the toilet is installed with the left side on an outside wall.  It allows the same unit to work in either position with the outside cassette access on either side.  The unused space is just covered and not really meant to be useful.

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