Manitowoc Grove GMK 4100L-1 - Checking for Leaks; Checking the Hydraulic Hoses

Maintenance work on the carrier
7.15 Hydraulic system
7 - 98 3 302 364 en Maintenance manual
GMK 4100L-1
25.11.2016
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 7
2
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 Checking the oil level, p. 7 - 97.
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1 Manufacturer's designation.
2 Maximum operation 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.
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