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oyvind.johannessen
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Join Date: Oct 2006
Posts: 3

Dowty Hydraulic Gear pumps

10/03/2006 11:17 AM

Our factory have been supplying these pumps on equipment that we sell worldwide, however I have discovered that the configuration of these pumps are wrong. In order to change rotation the body have to be turned around. In a lot of cases this was done without changing the internal valves around, so that the pressure side lubricated the shafts. What I discovered is that as pressure increased the shafts got pinned and subsequently the coupling (neoprene), broke. Is there anyone that has a schematic for these pumps?
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Pathfinder Tags: Hydraulic Pumps
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pg2
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Join Date: Oct 2006
Posts: 3
#1

Re: Dowty Hydraulic Gear pumps

10/04/2006 3:16 AM

hi Oyvind, "In order to change rotation the body have to be turned around." Can I ask why exactly do you have to turn the body to change rotation on a gear pump? Thanks, Paul

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Pressure Drop
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Join Date: Nov 2008
Posts: 25
#2

Re: Dowty Hydraulic Gear pumps

04/03/2009 5:38 PM

External gear pumps can be reassembled to clockwise or counterclockwise... but you have to be very careful that when you change the rotation, some parts have to be re-oriented so that the drain passage is oriented/connected to the inlet... else most commonly the shaft seal burst/leaks. The gears and gear plates are identical but there is a slotted passage from the inlet to the bearing lubrication.
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