boxathey
Full Access Member
I drive around an F550 @ work i believe it is an 1989 it does have the electric backup motor on it. It also helps set the parking brake when the engine is off.
I looked into this for a different application a few months ago. My idea was to have a pressure switch automatically kick the electric on if the PS failed for any reason. It was for a high-risk mission critical piece of equipment.
Found this in my research:
http://www.ebay.com/itm/Hydraulic-p...Parts_Accessories&hash=item3cc6e12a94&vxp=mtr
Seems to come from a Cab-over truck of some sort. (Isuzu or Volvo... can't remember) It is the primary pump on these trucks, so my guess it that it has a high duty cycle.