Checking The Hydraulic Hoses; Checking For Leaks - Manitowoc Grove GMK 5250L Maintenance Manual

Maintenance work on the carrier
7.15 Hydraulic system
7.15.2
7.15.3
7 - 102

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).

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 oil level if there are leaks;
Hydraulic hoses should not be used for longer
than 72 months from date of manufacture.
The date of manufacture and the permitted
operating pressure are marked on the hose fit-
ting:
1 Manufacturer's designation.
2 Maximum operating pressure and unit
of measurement (A) (e.g. 250 bar
(3,626 psi)).
Maximum operation pressure and unit
of measurement (B) (e.g. 25.0 MPa
(3,626 psi)).
3 Month and year of manufacture.
•
Always ensure that the corresponding parts
of the hydraulic system are depressurised.
•
Damaged or old hydraulic hoses must be
replaced immediately.
à
3 302 744 en
Checking the oil level , p. 7 - 101.
Maintenance manual
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GMK5250L