Hydraulic Hoses
The service life of a hose used on a mobile crane may significantly vary from the indicated
lifetime of the hose from the manufacturer. The service life is influenced by a number of
factors such as environment (temperature, humidity, corrosive air...) and use, duty cycles,
bending cycles, abrasion, fluid etc. External unfavorable factors like heat, repeated bending
under pressure etc. can reduce the lifetime significantly whereas other circumstances could
allow a service life that may exceed a given period.
Inspection of Hydraulic Hoses
A daily visual check of the crane by the operator or a competent service person before
starting the operation shall include an inspection of the hydraulic hoses as far as possible;
any traces of hydraulic oil on the crane or beneath a parked mobile crane shall lead to
further investigation. The daily check might indicate irregularities and / or leakages in the
hydraulic system that should be taken care of immediately. In addition to these daily
checks Terex recommends annual inspections of all hose assemblies as a minimum
maintenance of the crane. Older cranes may require more frequent inspections.
Inspection Criteria:
Hydraulic hoses should be replaced if any of the following criteria are true:
● Damage on outside surface (cover) of the hose (e.g. crack, cuts, any abrasion that
exposes the hose braid (reinforcement).
● Embrittlement due to ageing of outer surface (cracking appearing).
● Deformation that does not correspond to the original routing and shape of the hose. This
criteria shall be checked in both non-pressurized and pressurized conditions and / or when
bending (e.g. check for separation of hose layers, formation of blowholes, crushed points,
kinks, torsioning).
● Leakage.
● Damage or deformation of hose fittings (sealing functionality affected).
● Movement between hose bulk and hose assembly (e.g. hose creeping out of fitting).
● Corrosion on fitting that can affect strength or function of the fitting.
T300-1_T500-1_T780
Maintenance
362 P/N 12261-683
REVISED: January 2015
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