Blue Angel (Canados 70s) Rebuild thread
- Thread starter BartW
- Start date
BartW
Well-known member
The black box is port engine PTO and you can see port drive shaft under it.
how much is the diameter of that drive shaft ?
appears small compared to the schafts in BA,
might be a impression, but just curious
by the way,
it is refreshing to see these clear pics in my dusty thread
your e/r is impressively clean,
I like that
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Deleted User YDKXO
Guest
Yup you can do that but you also have to match the rpm and power rating of the PTO with the pump you're bolting on to it which is why it's best to stick with OEM equipment
BartW
Well-known member
browsing in online data sheets, I found that these pumps are available in different rpm and power ratings,...
I believe that this is your specialist domain,
so whatever I do, I'll have it checked on here
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Deleted User YDKXO
Guest
I believe that this is your specialist domain,
so whatever I do, I'll have it checked on here
No it's not my specialist domain but I employ people for whom it is
jfm
Well-known member
Yup agreed. But hydr pumps will acceot a wide range of RPMs. And the power is fine - 1000++hp! Way more than the pump can ever absorb. Harder bit is matching the splines
RobWales
Active member
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Deleted User YDKXO
Guest
Yeah but many PTOs cannot transmit the full power of the engine and neither can they necessarily supply the correct rpm to ensure that the hydraulic pump supplies the max oil flow required by the stabilizers. The stabilizers will require that max flow at a certain pressure which will determine the power requirement. The hydraulic pump needs to be selected such that it's power rating exceeds that required by the stabilizer hyd system and the PTO needs to be capable of transmitting that power and providing the necessary rpm. Its not just a case of bolting a hyd pump on the back of the engine or gearbox
BartW
Well-known member
Yeah but many PTOs cannot transmit the full power of the engine and neither can they necessarily supply the correct rpm to ensure that the hydraulic pump supplies the max oil flow required by the stabilizers. The stabilizers will require that max flow at a certain pressure which will determine the power requirement. The hydraulic pump needs to be selected such that it's power rating exceeds that required by the stabilizer hyd system and the PTO needs to be capable of transmitting that power and providing the necessary rpm. Its not just a case of bolting a hyd pump on the back of the engine or gearbox
whenever I come to order a stab system,
I assume that the supplier has a good knowledge and experience about what kind of pump is suitable on my Man-ZF engine gearbox.
This is a very standard configuration, found in many older MY's.
Ofcause I won't forget to asc opinions and approval on here
BartW
Well-known member
Not much left where you're good at Mike
There must something, pls tell
Just read the article from Mark F in YBW
Well done that man, nice article
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Deleted User YDKXO
Guest
I'm good for absolutely nothing according to SWMBONot much left where you're good at Mike
There must something, pls tell
Thanks but they hacked the original copy about a lot so I'm not happy about how it read in the end
BartW
Well-known member
IMHO, your ungrateful swmbo needs to appreciate who's paying the bills a bit more and maybe triing to see the quality’s of her beloved other half.
I was missing the sarcasm, and light harted style from your Croatia holliday report a long time ago
MapisM
Well-known member
It actually is, to some extent.
In my boat, the stabs pump is belt driven (go figure!), and in spite of that it's powerful enough to run the stabs effectively at ANY boat speed: also at 1000 rpm and 6 kts, the stabs work perfectly. And as I'm sure you know, the slower the speed, the harder they must work, for any given sea condition.
jfm
Well-known member
+1
Mike you're introducing a bunch of factors that don't exist. All that's needed is to spec a hydr pump that supplies way more oil flow/pressure than you need becuase it needs to operate the stabs at low rpm and it will absorb only the power it needs. PTO shafts deliver way more than the power you'll ever need and as a matter of engineering their limitation is ability to supply torque not power because their breaking point is indifferent to the rpm and is sensitive only to torque
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Deleted User YDKXO
Guest
Mmm, as high tech as a Harley
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Deleted User YDKXO
Guest
jfm, agree to disagree on this but if I was spending tens of thousands of quids on a stabilizer system, I'd want to satisfy myself that the PTO drive system could adequately provide the speed and power it needed
MapisM
Well-known member
So what? It did its job for more than a decade and a half, and counting (touch wood!).Mmm, as high tech as a Harley
Besides, all the maintenance it needed was ONE belt tensioning, 5 or 6 yrs ago.
That's more than can be said of even HDs in the bike world, I reckon.
Anyway, my example was simply to point out that your concerns, re-confirmed also in your last reply to jfm, have no reason to exist.
Diesel engines PTOs are designed for applications in comparison to which an hydraulic pump - even if it's probably the most common use in marine engines - is pretty much a walk in the park.
These things are used to run combine harvesters, for crissake...!
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Deleted User YDKXO
Guest
If one of my manufacturers (even the Italian ones) produced a machine with a belt driven hydraulic pump to drive its services, my customers would laughSo what? It did its job for more than a decade and a half, and counting (touch wood!).
Besides, all the maintenance it needed was ONE belt tensioning, 5 or 6 yrs ago.
That's more than can be said of even HDs in the bike world, I reckon.
BartW
Well-known member
BartW
Well-known member
If one of my manufacturers (even the Italian ones) produced a machine with a belt driven hydraulic pump to drive its services, my customers would laugh
I'm pritty shure that I've seen bulldozers with a belt driven hydraulic pump in the past, or am I mistaken ?