Maintenance work on the carrier
7.15 Hydraulic system
7 - 92 3 302 649 en Maintenance manual
GMK4090
07.12.2017
7.15.2 Checking the hydraulic hoses
Hydraulic hoses are also subject to ageing as well as internal and external
strain.
• Check the hydraulic hoses for
– external damage (tears, abrasion, heat damage, chemical damage),
– leaks and moist areas,
– blistering or unevenness of hose casing,
– signs of ageing (porous surface, rust on hose fittings).
Hydraulic hoses should not be used for longer
than 72 months from date of manufacture.
The date of manufacture and the permitted
operation pressure are marked on the hose
fitting:
• Always ensure that the corresponding parts
of the hydraulic system are depressurised.
• Damaged or old hydraulic hoses must be
replaced immediately.
7.15.3 Checking for leaks
• When the engine is running, carry out a visual inspection for leaks on the
hydraulic system (pumps, drives, cylinders, control blocks, valves, pipe
and hose lines and connections).
• Check the hydraulic oil cooler for dirt; à Have the radiator checked/cleaned,
p. 7 - 18.
• Check the oil level if there are leaks; à Check the oil level, p. 7 - 91.
1 Manufacturer designation
2 Maximum operation pressure and unit
of measurement (A) (e.g. 250 bar
(3,626 psi)).
Maximum operating pressure and unit
of measurement (B) (e.g. 25.0 MPa
(3,626 psi)).
3 Month and year of manufacture.
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