ASV 0404-766, Operation And Maintenance Manual

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2.20 Hydraulic Hoses/Lines
• Repairs to hydraulic hoses and hydraulic hose lines are forbidden! These
repairs must be performed by trained personnel.
• All hoses, hose lines and screw connections must be checked daily for
leaks and externally visible damage! Replace any damaged parts
immediately! Oil spraying out can cause injuries and burns.
• Even if they are stored properly and subject to proper loads, hoses and hose
lines are subject to natural aging. Their service life is therefore limited.
Improper storage, mechanical damage and impermissible load are the most
frequent causes of failure.
The usage period of a hose line should not exceed 6 years, including a
storage time of no more than 2 years.
Operation under extreme conditions (examples: frequent exposure to heavy
loads, high or low temperatures, extended operating times) will further
reduce hose service life.
• Hoses and hose lines must be replaced if any of the following criteria are
encountered during inspections:
-
damage to the outer hose up to the insert (for example worn spots, cuts
and tears)
- embrittlement of the outer layer (formation of cracks in the hose
material)
- deformation when under pressure, without pressure or when bending
which differ from the original shape of the hose or
hose line, for example separation of layers, formation of bubbles or
leaks
- damage resulting from improper installation
- damage or deformation to the hose fitting that reduces the stability of
the fitting or the hose/fitting connection
- hose coming loose from the fitting
- corrosion of the fitting that reduces functionality and stability
- exceeding storage times and usage periods
• When replacing hoses and hose lines, use only original equipment
replacement parts. Install hoses and hose lines properly. Do not confuse
connections.
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2 SAFETY
RT-40 US O&M
0404-766 2019-05