Gear pump for small engine

[Adam Marshall]

Is it possible to make a small hydraulic power unit with a 3hp engine? What size gear pump would I need to output reasonable pressure thanks. I may get an electric motor but 3.7kw motors are mega money

 

[Pete.]

3hp is only 2.2kw so not as expensive to match your engine output as buying a 3.7kw motor.

 

[Adam Marshall]

Pete thanks ebay seems fairly cheap for motors. Im not sure what size pump I would need to make up a small hydraulic power unit or what pressure I should account for, but the ram it will operate is only 400mm long and 3 inch in diameter rod size 30mm. thanks

 

[brightspark]

i have a new hydraulic pump in garage . it has makers details on it but I don't know owt about its spec il look and post later today

 

[julianf]

What voltage would you want to work with if you went electric?

I ask, as i purchased a motor and a gear pump from a forklift, intending to make a log splitter, and then i just ended up buying a commercial splitter.

It owes more more than you would want to pay, however, i understand that sometimes you have to take a hit...

If youre interested, lll find it, and see if it has any sensible markings on it.

 

[julianf]

ps. i just looked up the rough spec from an old email -

48volt dc motor
3700 watt

 

[Adam Marshall]

Julian I'm not sure on voltage don't want to be going 3 phase as I haven't got access to this

 

[julianf]

You may find it hard to produce 3700w @ 48v dc.

I purchased the unit a while back now, but that seemed to be one of the problems with my initial plan, however, i really did not look into it that far before an off-the-shelf solution came about.

The unit cost me £50 - if you think it will be of use to you, then ill get some photos.

 

[Adam Marshall]

If you could get some pics that would be great thanks

 

[Adam Marshall]

Don't forget I may be interested haha

 

[8ob]

It would help if the application was known and what you are expecting of it. Hydraulics can run anywhere between 1000-10000 psi so before selecting a motor or pump a bit more info is needed.

Bob

 

[julianf]

If you could get some pics that would be great thanks

Ive just taken a bunch of photos and put them here -

http://s1277.photobucket.com/user/julianfincham/library/gearpump

There's a load of the same thing, in case its easier to see the writing that way.

You dont really get the scale from the photos - i mean its not vast, but the thing weighs 20kg plus, but, like i say, its approaching 4kw


There's a burr on one of the unions. I suspect it could be resolved with a small sanding wheel.

 

[julianf]

ps

googling "bosch 0136501057" brings up plenty of retailers, but not much actual useful stuff!

haha... ive just found this link -

http://www.rakuten.de/produkt/dc-mo...sch-1517220542-48v37kw-amp4633-796841486.html

Over 1000 euros, without the gear pump!

(a bit cheaper on ebay - http://www.ebay.fr/itm/DC-Moteur-E-moteur-Amr-fluitronics-Berendsen-terex-48v-3-7kw/142038384897 )


But, again, you need to have a way of powering it, or its nothing more than a doorstop.

 

[Adam Marshall]

8ob the motor and pump are to be used for a kinderling chopper basically a waffle type blade on a steel table and ram pressing down on the wood to chop it into sticks I will only be chopping pallet wood but want to be able to chop a pile up at once. Bag under table to catch them. I chop alot up for sale so would like to be able to use this indoors without fumes etc

 

[Adam Marshall]

Julianf what power source did you have for this motor?

 

[julianf]

I did not - as i said, i purchased it, but, shortly after, came upon an off-the-shelf unit for cheap.

Powering it would be the issue, as ive tried to highlight - really i bought it for the pump, rather than the motor, but i reckon someone on here may be able to advise on how best to get 48v dc at 80amps (aprox) from a 1ph 230v supply (obviously not through a 13 amp fuse..)

 

[julianf]

A 'normal' macine mart (etc) splitter is, i think, more like 2kw, so this one would almost double that power, but i guess you would need to match the ram to the pump / your application for it to come good.

 

[Adam Marshall]

Julianf what would postage be on something that heavy?

 

[julianf]

just replied to your pm...

 

[dannyp]

off the end of the charts ( that i have ) small im afraid. my guestimation is that a 6cc pump @ 3500 rpm would be needing 3 hp by 690 PSI so about useless,

put a 3 - 3.6 - 1 reduction on it down to 1.5 ish GPM but at nearly 3000 psi so it'll make usefull pressure but very slow