mono viton stator (for ML) - been getting quotes

[julianf]

Anchor pumps - £75 ex
Pumpstore - £67.50 ex

Have not tried anywhere else yet (suggestions welcome)

At this rate, however, i think it would be worth just using the nitrile and replacing it now and again (i dont use it on the reactor, however, it would be nice to be able to pump methanol containing compounds now and again)

[Julian]

Try Mono themselves, they have a spares dept and are happy to deal with members of the public.

My viton stator is holding up well (better than the seal!) even when used as part of the processor, often running at 100°C.

Is the pump not producing the flow anymore?

[julianf]

Pump is fine - well, as fine as its ever been (i dont have anything to compare it with - pumps ok, but doesnt half make a racket!)

...but id like to use it to pump sludge from bio settling drums etc. too.

Basically, ive had it some time now, but rarely actually use it, as most of the tasks id like to do with it are not pure veg.  I think id get far more use out of it with the viton stator.


Indeed, i think ive only ever used it for one bio task - i had to pump 1000ltrs - i did it in one go, and then ran a water / glyc mix through it (IIRC) - so its been cared for, and would have years left on it, if i only pumped veg (replaced the stator and rotor when i purchased it) but, at present, mainly it just lurks about, getting in the way...

[Julian]

If it's getting in your way I'll rehome it ... pet and smoke free, warm, clean shed where it can see out the rest of it's days in peace.  I'll allow annual visits, but no under cover operations to check on the quality of care!

I only changed the stator on mine because it tore it's self appart (different design to the ML).  As far as I could tell the Nitrile was holding up reasonably well to the chemicals.

I don't think the stator is likely to cause the pump to be noisy, it's more likely to be the coupling.  Might be worth pulling it apart and checking.

[julianf]

The whole device just seems to vibrate a lot.... Its a big electric motor, and it has a flexible coupling to the worm drive, so id assumed that was just the deal.

...but then someone said the other day that monos were quiet!


Ive just got in another quote -

HSS - £75 ex

I think, possibly, mono list price on them is £75 and that's just what people, who dont have them in stock, are quoting me.  HSS wanted £18 delivery though??

[Tony]

How much suction do you have on the inlet?

Mine normally sits there grumbling away until the foot strainer blocks, then it gets noisy.  Actually, all the oil in the suction pipe turns creamy - though the instant the vacuum is released it snaps back to oil colour again!

[julianf]

Hmm... im not sure if mine is that impressive.

If i make it to the BBB this year, ill bring it along, and then maybe one of you pumpophiles can eyeball it for me?

[Julian]

Didn't you buy a new rotor for it when you got it?

I could bring a couple along, Certainly one wasn't very impressive when I last tried it.

We'll need hoses and a water supply so they don't run dry!

[julianf]

Yep, when i purchased it, i replaced both the rotor and the stator, as i did not really know which was the issue.

The new rotor looked pretty much the same as the old one, however, when i fitted each to the new stator the difference was significant - the new stator would just fall off the old rotor, whilst it was some effort to sepperate the pair of new parts.

So, yes, the pump had a new stator and rotor fitted not long ago, in terms of use - ive probably only run it for 45 mins since!

[Julian]

OK, instead of re-homing it, I'll buy it for a fiver!

These pumps will run on and off for decades pumping water with very little lubrication properties.  If you've run it on oil or bio for less than an hour, then the chances of the stator, let alone the rotor being even the slightest bit warn are about the same as you selling it to me for a fiver!

Check the coupling/motor bearings.

[julianf]

After writing the above thread, I've been using the mono more, for things it shouldn't (ie bio and glyc) and it has suffered.

It now has issues self priming in some circumstances, so my suspicion is that the stator may have now seen better days.

A new viton unit does seem overly expensive though : (

Julian -

Your ever growing collection of bargain monos -

Do you recon them on arrival, or just shelve them (in true collector style!)

The reason I ask is - surely there's only so many veg pumping tasks, and if they do indeed die on bio, with standard parts, as I've found (am finding) I would imagine they are all a bit useless without the best part of £90 spent on each one?

[Tony]

Maybe it depends what you're using it for, but I've had my ML/2 for years pumping veg only with the NBR stator without issues.  It can be noisy but it came to me worn, having been used beforehand as a garden pond pump.

Perhaps methanol/bio causes accelerated deterioration?

I've got a new rotor, and I would like a spare stator for mine.

[julianf]

I got one of those £10 rotors from ebay as well.  Was tempted by the couplings, but didnt buy.

Never seen viton stators on the cheap though.  Just called Mono - price is now £80.20 ex.

[Julian]

Haven't we had a conversation before where we ascertained that your pump was an MS?

The MS stator is very different to an ML or MM, and the MS doesn't have a coupling, the rotor screws direct onto the motor shaft.

This is an MS ...



and this an ML or MM ...

[julianf]

Haven't we had a conversation before where we ascertained that your pump was an MS?

The MS stator is very different to an ML or MM, and the MS doesn't have a coupling, the rotor screws direct onto the motor shaft.

This is an MS ...



and this an ML or MM ...

Yes, we had the conversation, and no, mine is an ML

(i also have an ms, coupled to a JAP engine, but ive never used that)

The confusion at the BBB was that, when looking at the part you had, i thought mine was physically smaller (same in line config, just smaller).

I got home, scraped off the grime and sawdust, and realised mine was the same size.  It was nothing more than confustion over scale - never over design.