19
2200179_ _ 7225 2018-04-23
© Rototilt Group AB
Instructions_Grapple
Max
25 MPa
1
2
2
1
3
4
EN
!
WARNING!
The grapple is fitted with an accumulator.
It is a high-pressure pressure vessel that must
be discharged before any kind of service work.
Undo the connections carefully.
Grapple cylinder
The grapple cylinder has inbuilt buffering
at its inner end position.
Following connection to the hydraulic
system, the cylinder must be vented
by slowly running it to its end positions
a few times.
1.
Connection, Open (-)
2.
Connection, Close (+)
3.
Accumulator, pressurized ≤20 MPa
4. Load-holding valve
The grapple cylinder is operated by a
double-acting hydraulic circuit. Oil flow
on the cylinder (+) side closes the grapple
arms, while oil flow on the cylinder (-)
side opens the grapple arms.
The grapple’s hydraulic system includes
a safety device that makes sure grapple
functions are not lost in the case of an
unintentional pressure drop in the base
machine hydraulic system.
The safety device comprises a load
holding valve and accumulator. The
load holding valve maintains hydraulic
pressure on the grapple (+) side, which
prevents unintentional grapple opening.
The pressurized gas in the accumulator
is compressed further by hydraulic
pressure at the start of work. This
automatically adjusts the grapple if the
load shifts.
Warning decals
1.
Maximum working pressure 25MPa;
affixed to the grapple chassis.
2.
Pressurized equipment; affixed to
the accumulator.
!
IMPORTANT!
the decals are extremely important for safety
when operating the grapple.
Keep the warning decals fully legible.
