Manitowoc GROVE GMK7450 Maintenance Manual page 172

Maintenance work on the carrier
7.14 Hydraulic system
Bleeding the
hydraulic system
Preparations
G
G
7 - 100
•
Start the engine.
•
Carry out all hydraulic functions several times to remove any air in the
system.
•
Test drive the truck crane, turning the steering wheel several times to its
fullest extent.
•
Check the oil level through the sight glass on the hydraulic oil tank. Top
up oil if necessary;
If the steering is "loose" during the test drive, you must bleed the steering
cylinders of the hydraulic system.
– The truck crane is raised on outriggers;
– The parking brake must be applied.
Risk of crushing from turning wheels!
When working between the wheels ensure that the steering wheel cannot
be turned by an unauthorised person. The wheels turn when the steering
wheel is operated.
Risk of accidents from high oil pressure!
Never undo the hose connections completely. The hydraulic system is
under pressure, even when the steering wheel is not turned.
à
Check the oil level , P. 7 - 87.
Bleed the steering cylinders individually, one
after the other
•
Start the engine.
•
Bleed each steering cylinder (2) by loosen-
ing each of the collar nuts (1) in turn, until
the oil coming out no longer contains air
bubbles.
If the steering system is still not operating
properly
•
Notify
Manitowoc Crane Care
ised GROVE dealer or an authorised special-
ist workshop.
3 302 577 en
à
Operating manual .
or an author-
Maintenance manual
GMK7450