Maintenance work on the carrier
7.14 Hydraulic system
7 - 88 3 302 577 en Maintenance manual
GMK7450
16.08.2018
7.14.2 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 7
2
months from date of manufacture.
The date of manufacture and the permitted
operating 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.
7.14.3 Checking for leaks
•
When the engine is running, carry out a visual inspection for leaks on the
hydraulic system (pumps, drives, cylinders, contro
l blocks, valves, pipe
and hose lines and connections).
• Check the hydraulic oil cooler for dirt; à Have the radiator checked/cleaned,
P. 7 - 19.
• Check the oil level if there are leaks; à Check the oil level, P. 7 - 87.
1 Manufacturer's designation.
2 Maximum operation pressure and unit
of measurement (A) (e. g. 250 bar
(3626 psi)).
Maximum operation pressure and unit
of measurement (B) (e. g. 25.0 MPa
(3626 psi)).
3 Month and year of manufacture.
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