Need pump motor help

[crusher]

Can anyone enlighten me on what motor to buy for a hyd pump? I am scratch building a cat 330b 1/14 scale, have the valve body built and am working on a pump. I read on one of the posts by someone building a 966 loader, he was using a thunder tiger 36 series ripper outrunner, there are many thunder tigers out there but not knowing what all the numbers mean not sure what to buy. Any help would be appreciated.
Thanks.
Terry

[bigford]

I have this set up in my 345 excavator
http://www.magomhrc.com/en/hydraulic-pumps/449-hydraulic-pump-mg-hr7-900ml-brushless-motor.html

[crusher]

Thanks for your reply bigford, that is a nice set up but too rich for my project. What motor do they use ?
Terry

[bigford]

No markings on the motor. Just linked as a reference
To size of the motor

[dozerbuilder]

Take a look at this stuff. Good specs too.

http://motors.vex.com/

And here. Good stuff for our builds including 2-stage transmissions, drives etc.

http://www.wcproducts.net/motors

And finally, andymark.
http://www.andymark.com/Motors-s/260.htm

[crusher]

Thanks for your reply dozerbuilder, will look at all you sent.
Terry

[Rimrock]

I would recommend a brushless motor, outrunner, for it's compact size and relative high power. Outer diameter in the area 36 to 42 mm. They are marked e.g KV800 which means 800 rpm for each 1 Volt, so that is about 9600 rpm at 12V (unloaded) A high end pump from e.g Premacon runs in the area 2-4000 rpm (there is a planetary gear between pump and motor) A DIY pump may need more than double that rpm because of more internal leakage than a pump made to industrial standards.

[crusher]

Thanks for your reply rimrock, good info, I am attempting to make my own pump, will post the results.
Terry