Hose rupture valves
(Optional equipment)
WARNING
Risk of crushing.
A raised attachment could fall and cause crushing
injury.
Before leaving the cab, always lower all
attachments to the ground and lock the control
functions.
NOTICE
Do not dismantle the hose rupture valve as it is
pressurised. Contact a workshop authorised by
Volvo if problems arise.
If the machine is equipped with hose rupture valves,
it will reduce the falling speed of the boom if a hose
bursts.
Attachment lowering after hose rupture
When engine is running
Lower the boom or arm with the operating levers
in the usual way. Collect the oil from the ruptured
hose in a suitable vessel.
When engine is stopped
The servo hydraulic pressure is maintained by a
pressure in accumulator for a few minutes, which
permits the operator to lower the boom or arm in
the usual way with operating levers. Do not wait
too long to lower the boom, the pilot pressure will
reduce at a speed depending on your machine's
condition and equipment. Collect the oil from the
ruptured hose in a suitable vessel.
When engine is stopped and with no servo
hydraulic pressure
Operating techniques
Hose rupture valves
219
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