Auxiliary hydraulic line
You want to connect a hydraulic tool to your excavator.
Three points decide:
single or double acting, flow and pressure at the end of the dipper arm, couplings and control in the cab.
A photo of the end of the dipper arm is enough to start.
A hose that knocks against the steel wears from the outside:
the clamps hold it in place.
Photo:
Jan van der Wolf, Pexels licence, via Pexels, sticker removed.
It is the first question, even before the flow.
Without an auxiliary line:
no breaker, no grab, no auger, no screening bucket.
Other names for this tool: auxiliary line, auxiliary circuit, additional hydraulics, hydraulic take-off.
- Family
- Coupling and adapting
- Classes or machines concerned
- All
- Fitting
- Along the dipper arm, up to the end of the dipper arm
- Power source
- Hydraulic: it is what powers the tool
What it is for
Right: a bare dipper arm, with no hose or connector, where no tool can be connected.
What sets it apart:
it is a piece of information the driver can check for themselves, by looking at the dipper arm.
Computer-generated image.
it is the part that wears and gets replaced.
Photo:
Ilmtaler, CC BY-SA 4.0, via Wikimedia Commons.
What gets checked before connecting a tool:
the condition of the hose covers and the tightness of the fittings.
Photo:
Peter Dyllong, Pexels licence, via Pexels, lettering removed.
a hose that beats against the steel wears from the outside.
Synthetic image.
Many mini-excavators do not have one.
It is a piece of information the driver can check for themselves, without documentation:
you only have to look and see whether there are hoses running along the dipper arm and ending in fittings.
A single-acting line sends pressurised oil in one direction only:
the oil returns to the tank through a return line, as on a breaker.
A double-acting line has two lines that take the pressure in turn:
it drives a movement in both directions, such as opening and closing a grab.
Some motors also need a case drain, an unpressurised line that takes internal leakage back to the tank.
And a hydraulic coupler needs its own control line, separate from the one that powers the tools.
Two tools on the same machine can call for very different flows and pressures. A screening and crushing bucket for a small machine and a breaker of the same class do not work in the same conditions.
It is the example that best explains why the tonnage is never enough. See the compatibility page.
On which machine?
An auxiliary hydraulic line applies to all machine classes.
It is laid along the boom and the dipper arm, up to the end of the dipper arm.
The exact mounting: we calculate it with you for your machine.
What the tool does
It is what supplies the tool at the end of the dipper arm.
The number of circuits, single- or double-acting, and the fittings: we calculate them with you for your machine.
What is needed on the hydraulic side
The flow, the maximum pressure, the free return, the case drain and the control in the cab: we calculate them with you for your machine.
Your study sets the exact value for your machine.
Don't have these figures?
A photo of the machine is enough to start.
Have your machine checked.
Send us a photograph of the end of your machine's dipper arm and its exact model.
It is the most useful photograph you can send us.
- Your machine Its exact make and model.
- What is fitted What equips the machine today.
- The work What the machine is used for.
Without these details, the study still begins: we will ask you for them.
Or call 01 84 16 55 49 · our lines are open 7 days a week, from 7h to 22h.
Written study within 3 working days, once the file is complete.
Synthetic image.
What determines the choice
Each point says what changes the choice.
The values, we check them in your carrier's instructions and in the tool's.
-
01 — Single acting, double acting, case drain
A tool that works in one direction only needs a supply and a return to the tank;
a tool that opens and closes, or turns in both directions, needs double acting.
The case drain, when the tool's instructions require it, is one more line. -
02 — The flow available
An underfed tool does not work;
overfed, it overheats and breaks. - 03 — The working pressure It is checked in the same way as the flow, and it is often forgotten.
-
04 — The number of lines
Tools, hydraulic coupler, tiltrotator:
each wants its own.
What is checked before ordering
- The presence of hoses at the end of the dipper arm The simplest check, and nobody can do it for you better than a photograph.
- The flow and the pressure really available At the outlet, not at the pump.
- The type of fittings They decide what connects without adaptation.
- The control in the cab A line with no control is of no use.
- Family
- Coupling and adapting
- Trade
- Special foundations
- Compatibility
- The seven criteria in detail →