Construction Machinery & Attachments worked example

Hydraulic Flow Requirement with attachment rated hydraulic flow of 70 units: a worked example

This scenario runs the hydraulic flow requirement calculation on the strong side: attachment rated hydraulic flow of 70 units, with every other input held at its documented default. screening attachment compatibility with carrier hydraulic flow capacity

The inputs for this scenario

  • Attachment rated hydraulic flow: 70 units (raised for this scenario; the documented default is 28)
  • Duty cycle and pressure-loss multiplier: 1.18 x (unchanged)
  • Operating time: 6 hr (unchanged)

Working through the calculation

  • Applying the documented formula (Adjusted hydraulic flow requirement = attachment rated hydraulic flow × duty cycle and pressure-loss multiplier) to the inputs above produces each figure below.
  • At this operating point the engine returns 82.6 gpm for adjusted hydraulic flow requirement, the number this scenario is built around.
  • At this operating point the engine returns 13.77 gpm / hr for flow demand per operating hour reference.
  • At this operating point the engine returns 70 gpm for attachment rated hydraulic flow.
  • At this operating point the engine returns 1.18 x for duty cycle and pressure-loss multiplier.

How this compares with the baseline

  • Against the tool's baseline example, where attachment rated hydraulic flow sits at 28 units and the headline result is 33.04 gpm, this scenario comes in 150% above the baseline at 82.6 gpm.
  • Use it before pairing an attachment to a carrier, or when troubleshooting an attachment that runs hot or sluggish. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • adjusted hydraulic flow requirement: 82.6 gpm (headline result)
  • flow demand per operating hour reference: 13.77 gpm / hr
  • attachment rated hydraulic flow: 70 gpm
  • duty cycle and pressure-loss multiplier: 1.18 x

Run it with your numbers

  • Every input above is editable in the live Hydraulic Flow Requirement calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.