Emtpying oil Via spool valve query

[ford 7810]

Fair enough £82 quid saving but looking at it from another angle it's only 40p per litre which ain't a huge amount. I'm not saying everyone should buy the most expensive oil but I do think that in some circumstances is it worth it for a relatively small amount.

£82 difference for the same stuff all Morris you must be joking

 

[thorpe]

Fair enough £82 quid saving but looking at it from another angle it's only 40p per litre which ain't a huge amount. I'm not saying everyone should buy the most expensive oil but I do think that in some circumstances is it worth it for a relatively small amount.

same oil , we don't cut corners to much at stake!

 

[Qman]

I bought a used IH 574 many years ago and when I dropped the black backend oil found a long piece of baler twine in it. That wouldn't come out with the Duck method!

Actually when I change my JD backends, I pump the oil into an old barrel til it squeaks, then drop the rest through the awkward plugs. I thought I was the first to use this method, but like other hobbies lots of people do it.

 

[agrimax]

What makes the barrel squeak?

 

[AnyOldName]

It's cavitation

Just to be clear about what you’re saying, when the oil level gets low enough that the pump inlet starts to pull in a combination of oil and air, you’re calling that cavitation?

 

[L P]

Just to be clear about what you’re saying, when the oil level gets low enough that the pump inlet starts to pull in a combination of oil and air, you’re calling that cavitation?

No, not exactly, where the oil and air are mixed it's aeration, so on the run from the suction strainer to the pump it's aeration, once on the pressure side of the pump those air molecules will implode under pressure, at this point it is cavitation.

 

[Bobthebuilder]

Any mechanic worth his salt would do the job right, and that is dropping the oil out through the drain plugs. A decent mechanic would be doing this job numerous times a week either for a service or a repair and would have the all the tips and tricks of how to get at the drain plugs and suitable containers to catch the oil. A farmer doing it once in a blue moon gets oil up to his armpits and all over the floor so looks for a more convenient way the next time. Of course farmer Giles would never take out so much through the spool that the pump runs dry.

It was a jd fitter that recommended doing it the spool way to me, they do it as it’s a LOT easier than laying underneath wether it be a nice clean workshop floor or a 5hitty farm yard

 

[Kiwi Pete]

Agco service manager said "yep crack on with it, obviously we don't go have smoko while it's pumping out, but that's how we do it.
We value the cleanliness of our shop floors, and yours"

Not that I'm worried as with only 6200 acres, don't need a tractor, but I was invited to ask a service manager and "get back"

 

[L P]

This is an interesting thread but it's a pity that knowledgeable people cannot state their opinions without insulting someone with a different view.

I wouldn't worry about it, I don't suppose the duck is bothered, I'm certainly not. What is a pity is that the op came for sound advice, telling him to run it til the pump draws air is terrible advice. Fine to run some out through the spool if you so wish and you know how much is in there to be safe. Don't know the chap from Adam, for all we know he might have had only 20l of oil in the back end full of brake linings.... given that, it's hard to feel insulted!

 

[AnyOldName]

No, not exactly, where the oil and air are mixed it's aeration, so on the run from the suction strainer to the pump it's aeration, once on the pressure side of the pump those air molecules will implode under pressure, at this point it is cavitation.

Cavitation is voids being formed in a fluid at low pressure, basically bubbles of empty space. When the pressure increases again, those bubbles collapse causing shock waves to pass through the fluid, generating noise and possible mechanical damage.

It cannot possibly happen in the pressure side of a pump, where the pressure has been increased. Whatever you think is happening there, it is not cavitation.

 

[ridger]

Cavitation is voids being formed in a fluid at low pressure, basically bubbles of empty space. When the pressure increases again, those bubbles collapse causing shock waves to pass through the fluid, generating noise and possible mechanical damage.

It cannot possibly happen in the pressure side of a pump, where the pressure has been increased. Whatever you think is happening there, it is not cavitation.

I'd call it running the pump dry

 

[trebornella]

Any mechanic worth his salt would do the job right, and that is dropping the oil out through the drain plugs. A decent mechanic would be doing this job numerous times a week either for a service or a repair and would have the all the tips and tricks of how to get at the drain plugs and suitable containers to catch the oil. A farmer doing it once in a blue moon gets oil up to his armpits and all over the floor so looks for a more convenient way the next time. Of course farmer Giles would never take out so much through the spool that the pump runs dry.

Interesting thread, and in case any of my old workmates are on here, just do as I did, spill most of it on the workshop floor!!!

 

[ford 7810]

Interesting thread, and in case any of my old workmates are on here, just do as I did, spill most of it on the workshop floor!!!

That’s what happens when you drain it all through the drain plugs specially with the pick up hitch or drawer bar in the way

 

[serf]

Looks like there was more than oil flowing in here last night!!

Was just thinking same to self just looked at time and thought wtf full length dialogue into this subject at that hour

 

[trebornella]

That’s what happens when you drain it all through the drain plugs specially with the pick up hitch or drawer bar in the way

I could do it anywhere, give me a drain plug and i'll give you an oil slick!!!

 

[Cowabunga]

I'd call it running the pump dry

Except it never gets the chance to run dry. Only partially pulling some air for a second or two. No problem whatsoever.

 

[MF CI]

That’s what happens when you drain it all through the drain plugs specially with the pick up hitch or drawer bar in the way

Not necessarily,

 

[ford 7810]

Not necessarily,

Does when I do it then you’ve got to crawl underneath to change the filters 40L/50 L out of the way through the spools is a good idea

 

[robs1]

What is all this talk of draining oil ?

 

[serf]

What is all this talk of draining oil ?

Yea I know , what a waste ,
it drains out the backend quicker than you can fill it as it is without encouraging it