Fluid Power Journal

Figure It Out

By Robert Sheaf
CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training

Simple Cylinder Circuit Starts To Overheat When the Directional Valve Was Changed

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training. The circuit shown worked well for 6 months and …

Pump Continues To Fail After the Main Directional Valve Was Replaced Weeks Earlier

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training.   A manufacturer had a machine where the …

Overheating Problem on a Sand Core Production Machine

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training. Back in 2016, I wrote up a problem on a machine …

Figure It Out: Ram Drifts Down After Replacing the Main Directional Valve

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training. A company that makes carbon fiber leaf springs …

Proportional Valve With Spool Feedback Oscillates Badly on Start-up

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training. A dam out west had a hydraulic system installed …

Figure It Out: Loud Noise Heard When Shutting Off a Hydraulic System

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training The attached circuit for a guillotine type press …

Figure It Out: New Motor Stalls and Pops Overloads

A system that worked well for many years needed its electric motor changed. The company bought a 40-horsepower electric motor, but it was a different brand …

Figure It Out: Press Upgrade Didn’t Fix Overheating Problem

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training  The above circuit drawing for a hydraulic …

Figure It Out: Relocating HPU Causes Start-up Problem

New Problem Relocating HPU Causes Start-up Problem By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial …

Figure It Out: Cargo Ship’s Cylinders Drifted

New Problem Cargo Ship’s Cylinders Drifted By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training. …

Figure It Out: Extractor Motor Reverse Speed Rises to an Unexpected Creep

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training A hydraulic system drives a vertical ball screw …

Figure It Out: Deep Pan Forming Press Loses Operating Pressure

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training A manufacturer of cooking pots and pans had a …

Figure It Out: Hydraulic Motor Slows as Accumulator Discharges

By Robert Sheaf, CFPAI/AJPP, CFPE, CFPS, CFPECS, CFPMT, CFPMIP, CFPMMH, CFPMIH, CFPMM, CFC Industrial Training A new system was required to run a hydraulic …

Shaft Seal Failed on New Pump

In the basement of a paper mill, a hydraulic power unit supplies all the flow and pressure needed to run one section of the mill. This section applies pressure …

Emergency System Fails to Close Safety Doors

A local repair shop was asked to troubleshoot a problem on the hydraulic system that closes a watertight door on a floating casino. The circuit was designed …