Originally Posted by AWJ Services
No one is lying too me. I never said that the machine would only make 19 gpm at 1000 psi or that the TB260 would make 27 gpm at 3000 psi. I said that the manufacturer rates there flow at 1000 psi and that the flow spec will be all the hyd hp you will have too work with. The TB260 makes 15gpm at 3000 psi which works out to about 27 hp. My Kubota makes about 10 to 11 at 3000-3100 psi. That equals about 19 hp. My point was too help people be able too have an understandable way too compare these machines. Most of these machines will make the rated flow up into the 1500 to 1900 psi range before the machine starts taking power away from the aux circuit. I got this informatioon from someone who actually has put a flow meter on these machines and others.
something doesn't seem right but maybe excavators are different on the aux circuit than skid steers. I've put flow meters on several skids to see the flow/psi at different rpms and watch pressure spikes, flow drops, etc. Most of the time the machines came stock out of range or on the low side. Same thing for RPM range, i've seen several machines not make enough rpms on the motor.
The hydraulic formula assumes 100% efficiency. We all know that's not the case at the quick couplers and from my experience, manufacturer rated flows and psi are off at the quick couplers, too.
I try and have each machine I buy tested before I put it in service especially when I am going to run high flow attachments. Out of about 8 or 9 skid steers, only one was set within the spec range but it was on the low side.