Document 57.4400.7200 - 1
st
Edition 03/2005
INDEX
ii
TELELIFT 3713 Elite - 4017 - 4514
INTRODUCTION
DESCRIPTION OF THE MACHINE OPERATION
The source of mechanical energy of this machine is a
Perkins turbo-compressed diesel engine
(pos. 1)
, model
1104C-44T, which supplies 74.5 kW at 2300 rev/min
and with a max torque of 412 Nm at 1400 rev/min.
On the flywheel side of the engine, and connected to
this engine by a Technodrive coupler with elastic joint
and with a 1-to-1 ratio, there is Bosch-Rexroth closed-
loop pump for hydrostatic drives, model A4VG71
(pos.
2)
with adjustment valve of DA type. The max
displacement of this swashplate pump is 71 cm
3
and
the max calibration pressure is 420 bar. This pump is
used to supply hydraulic power under form of pressure
and flow rate which is then used for moving the machine.
On the through-shaft of such drive pump there is a
Casappa open-loop gear pump (with fixed
displacement)
(pos. 3)
with priority valve integrated in
the housing. The displacement of this pump is 43 cm
3
.
Its function is to provide hydraulic power, under form of
pressure and flow rate, to the steering cylinder of the
machine (priority side) and to the telescopic boom
movement cylinder (secondary side).
The assembly of the two pumps involves they have a
rotation velocity equal to the speed of the diesel engine.
A third Casappa open-loop gear pump (with fixed
displacement)
(pos. 4)
with a displacement of 25 cm
3
,
is installed on the PTO of the engine located to the
distribution side. This pump feeds the servo-assisted
braking system
(pos. 24)
, the control block operating
the outriggers and the sway function
(pos. 28)
and the
cooling fan
(pos. 34)
of the heat exchanger
(pos. 33)
used to cool down the diesel engine and the hydraulic
circuit.
The suction lines of the open-loop pumps
(pos. 3)
and
(pos. 4)
are protected by an immersed filter
(pos. 9)
,
placed inside the hydraulic fluid tank
(pos. 10)
whose
capacity is 120 litres.
The drive pump
(pos. 2)
is protected by another
cartridge-filter
(pos. 8)
, located on the suction line of
the boost pump, such pump being integral part of the
drive pump.
The one-way valve
(pos. 11)
set at 2.5 bar protects the
pump housing against high pressures and guarantees
a certain circulation of the drain oil to the hydrostatic
motor reducing, in this way, the temperature.
From port “G” of the drive pump
(pos. 2)
low-pressure
oil is taken (25-30 bar) and used for the anti-cavitation
circuit of the automatic levelling system of the forks and
for feeding the control circuit of the electro-proportional
distributor
(pos. 16)
which controls the movements of
the telescopic boom.
Summary of Contents for TELELIFT 3713 Elite
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