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Re: OT Hydraulic Pump Ideas Needed


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Posted by greygoat on October 15, 2012 at 06:55:53 from (72.160.220.104):

In Reply to: OT Hydraulic Pump Ideas Needed posted by John B. on October 15, 2012 at 06:20:49:

#1. How was the pump driven: If it was direct
PTO shaft driven,(from the truck PTO) it may
not be usable with a "Side Load", such as a belt
or chain drive. That is: it may only have a bushing, instead of a roller or ball bearing
where the input shaft goes in..which will wear
and leak with a side load.
#2. How fast did it run on the truck? Some pumps
only run 600 to 1000 RPM on the truck, and put
out adiquate gallons per minute at those speeds.
Small engines are typically horsepower "Rated"
at 3600 RPM..if you tried to run a truck pump
that fast you"d have LOTS of gallons per minute
of flow..and unless you have VERY LARGE lines
you"d create lots of back pressure,(trying to
"Force" too much flow through small lines) and
need LOTS of horsepower to overcome that, PLUS,
create lots of HEAT!
#3. Finally..how much Horsepower did that truck
engine have??? Are you going to try to achieve
what a 250 Horsepower Cummins Diesel did..with
an old lawnmower engine ?
AND: what were you going to use for oil tank,
or reservior? A truck system can get by with a
small,(5 gallon) reservior, because it only runs
for a few minutes, putting a hoist/box up> then
it has time to cool off. If you want to run that
same system contionous, you"ll need large reservior capacity...2 to 3 times the GPM of the
pump, as a rule of thumb.
Vast plans start with half-vast ideas!


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