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Old 11-14-2013, 05:32 PM
mxridernorth mxridernorth is offline
LawnSite Senior Member
Join Date: Apr 2008
Location: North Saanich
Posts: 306
Here is the plot for the data provided for the T770. Notice the linear drop in pressure from 0 - 31.2 gpm? The pressure decrease over this range is only 800 psi. Clearly this is not exponential as you declared earlier. Would you like me to plot this on a log graph?
Name:  T770 flow data.jpg
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I don't have the schematic for the T770 but apparently from the brochure it runs gear pumps. A gear pump is a fixed displacement pump. The aux flow apparently has two configurations: variable flow and max flow. Which mode was the aux circuit running in? What was the rpms that the flow was taken at?

Get me the hydraulic schematics and I'll tell you what is going on.
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