Document number: ED.03783.00.001.ENG rev 4 Page 23 of 153
2.11 Dealing with hoses
• Make sure the maximum permitted pressure is never exceeded:
o Do not change any safety setting.
• Ensure that the accumulators and by-pass hoses are in good condition.
• Do not drive over or stand on the hoses:
o Standing on and driving over the hoses causes’ damage to the hose fabric, which
causes leaks.
o A sudden increase in pressure caused by squeezing the hose causes serious
damage to other components.
• Do not pull on a hose that is connected:
o If pulling forces are exerted on a hydraulic coupling the hose and coupling interface
will weaken which may result in the hose bursting out of the coupling.
o Always lift a hose by the hose itself, whilst supporting the coupling.
o Stow hoses in such a way that no forces (gravitational force) are exerted on the
coupling.
• While moving the hoses, prevent the couplings being dragged over the ground:
o Prevent excessive wear on the couplings and hoses by transporting them on pallets,
if possible.
o During assembly the hose must be supported by necessary use bend guides to
prevent twisting of the hose.
• Protect the hose sleeve in places where chafing etc. cannot be avoided:
o Wear spots can be prevented by sliding protective sleeves over areas where wear is
expected or by covering sharp edges.
• Change worn or damaged hoses immediately:
o If a hose is pressurized continuously by more than 20% above working pressure it
must be replaced.
• Do not use dirty or corroded couplings.
o They are less reliable
o They will cause leaks over time.
o They pollute the hydraulic system
• Disconnecting hydraulic tubing and hoses shall be done with utmost care.
o The system is designed in such a way that hydraulic pressure drops to zero when
the system is switched off. Nevertheless, pressure can remain due to
i. The presence of load on the system
ii. Raise of temperature
o But the hydraulic connections have been designed in such a way that either
i. they cannot be uncoupled when they’re under pressure, or
ii. they can be uncoupled under pressure of only a few bars, but measures have
been taken that no oil can come out
o Always use the manometers of the System to verify that the pressure is zero.
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