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 Topic: Thetford flush pump
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05/10/2011 at 12:14pm
Location: Shropshire
Outfit: Swift Challenger 570 2010
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First posting having just purchased our first caravan, a Lunar Premier 516 1994. All works and looks fantastic, only little issue is to do with the electric flush on the toilet. Previous owner said the flush occasionally blows the little 2.5 amp fuse in the screw holder on the under side of the bowl assembly, seemed to do it on the first use of flush following arrival on site after being not used for a few weeks, then worked OK for remainder of trip. Any ideas, sounds like the motor is tight to me but wondered if anyone else had similar issue and how it was resolved?
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05/10/2011 at 5:01pm
Location: West Mids
Outfit: Swift Ace Statesman & X-Trail 2.0
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Agree. If the impeller of the motor was sticky, this wouldn't generally blow the fuse. It isn't un-common for poor and/or corroded terminals so do as suggested above and check through wiring first.
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Paul
Every day's a school day!
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05/10/2011 at 5:48pm
Location: Lancashire
Outfit: Caravan now Sold
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Any ideas, sounds like the motor is tight to me but wondered if anyone else had similar issue and how it was resolved
your observation could be right as this also happens to water pumps after standing for some time.not tight more silted up.you could give the motor a soak in milton and water to remove the silt/algae before you go then drain off.the first sign of sticking when you initially switch on will blow the fuse.
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the only silly question is the one you do not ask.
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05/10/2011 at 7:21pm
Location: Cambs
Outfit: Tin tent diddy tent BIG tent
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I've seen a similar thing in the past and by spinning up the pump by means of a dowel inserted into the base of the pump and using a cordless drill it cleaned off the bearings and kept it going for a while but in the end it needed a new pump. The thetford ones are expensive but I seem to remember that they were simply re badged from another manufacturer that I can't recall. They are/were? a different shape to the commonly seen Whale pumps but these can still be used with a slight mod to the retaining bracket and outlet. I am guessing it is the older bench type of cassette toilet that you have. Changing the pump is quite straight forward but you will need some shrink tubing to seal the joint in the wires.
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'A sure cure for sea-sickness is to sit under a tree'
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05/10/2011 at 7:26pm
Location: None Entered
Outfit: abi jubilee envoy
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I had this problem on mine it kept blowing the fuse inside the locker door where the casette goes, I took the toilet roll holder out and found the pump had burnt out nearly, I got a new pump of ebay for around a tenner been ok ever since.
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07/10/2011 at 10:21am
Location: Shropshire
Outfit: Swift Challenger 570 2010
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Thanks all for replies. Tested yesterday and found pump had indeed seized, turned impeller forwards and backwards a few times and freed up so refitted, all working OK. Have ordered one off Ebay, a tenner, including p&p. Says it is made in same factory a Thetford ones, anyone tried one of these pumps? http://www.ebay.co.uk/itm/250893157312?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_1161wt_905
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07/10/2011 at 10:39am
Location: Lancashire
Outfit: Caravan now Sold
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looks ok,not tried one myself.
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the only silly question is the one you do not ask.
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07/10/2011 at 2:55pm
Location: Cambs
Outfit: Tin tent diddy tent BIG tent
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It certainly looks like the part needed and you even get the shrink tube. Make sure you cut the existing wires as close to the old pump as you can and that way you will have plenty of slack when installing the new one.
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'A sure cure for sea-sickness is to sit under a tree'
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07/10/2011 at 9:05pm
Location: West Mids
Outfit: Swift Ace Statesman & X-Trail 2.0
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Quote: Originally posted by beachhuggy on 07/10/2011
... Tested yesterday and found pump had indeed seized, turned impeller forwards and backwards a few times and freed up so refitted, all working OK.
Pleased you've tracked this down, but still suprised the fuses blow with a sticky impeller, as that doesn't generally cause such an increase in current (unless pump physically burning out, maybe there's some hidden damage to the windings too).
Glad you're sorted all the same.
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Paul
Every day's a school day!
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07/10/2011 at 10:55pm
Location: None Entered
Outfit: abi jubilee envoy
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look's like the one I got it will be fine mine still is a year later.
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