How Hydraulic Load Sensing Control Can Be Very Inefficient

Typical load-sensing circuit.

If you know something about load sensing hydraulic systems, the above headline appears to be a contradiction. After all, load sensing circuits match pump flow to actuator demand. And this is supposed to increase the hydraulic system’s efficiency. Not reduce it.

HOWEVER, under certain conditions a load sensing hydraulic system can be VERY inefficient. Let me give you a real-life … Read more

Tandem Piston Pumps, Shaft Seals and Case Drain Lines

IM000260A repairer rebuilt a hydraulic piston pump. A week later it came back like a boomerang, the subject of a warranty claim. Upon tear down the piston retaining plate was found to be broken–see inset pic. Fearing the aftermarket parts they used were not up to scratch, the repair shop quietly accepted warranty and rebuilt the pump for a second … Read more

When Hydraulics Terminology Stops Being Descriptive

Photo credit: Colin Kinner

There’s a lot of terminology in hydraulics. Some of it descriptive. Some of it misleading. Pressure Relief Valve. No confusion here. Directional Control Valve. Same. It says what it means and it means what is says. So let’s use this test: it says what it means and it means what is says, as the gold standard for descriptive terminology.

What … Read more