Checking The Hydraulic Hoses; Checking For Leaks - Manitowoc GROVE GMK6400 Maintenance Manual

Maintenance work on the carrier
7.14 Hydraulic system
7.14.2
7.14.3
7 - 90

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 (cracks, 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 the date of manufacture.
The date of manufacture and the permitted
operating pressure are marked on the hose
fitting:
1 Manufacturer designation
2 Maximum operating pressure with
units of measurement (A) (e.g. 250 bar
(3,626 psi)).
Maximum operating pressure with
units 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.
•
Immediately replace damaged or old hy-
draulic hoses.
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Checking the oil level , p. 7 - 89.
Maintenance manual
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GMK6400