When engine is stopped and with no servo
hydraulic pressure
WARNING
Risk of high pressure injection.
The hydraulic oil is under high pressure.
Discharging hydraulic oil will cause serious injury
when injected into the skin.
Depressurize the hydraulic system before
connecting or disconnecting hydraulic hoses.
NOTICE
Always use personal protective equipment, such as
working gloves, overalls and face protection or
protective goggles with side protection before you
release excess pressure in a hydraulic hose or pipe
connection.
1 Loosen lock nut (B) and turn adjusting screw
(A) counter-clockwise slowly.
Before turning the adjusting screw, mark its
position to facilitate assembling later (setting
pressure: 35.8 MPa, 365 kgf cm², 5192 psi)
The boom will then slowly be lowered to the
ground.
2 Turn adjusting screw (A) to its original position.
3 Hold adjusting screw (A) securely and tighten
lock nut (B).
4 Contact an authorized Volvo Construction
Equipment dealer workshop.
Hose rupture valves
A Adjusting screw
B Lock nut
Operating techniques
Hose rupture valves
257
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