Document 57.4402.9200 - 1
st
Edition 10/2006
INDEX
TELELIFT 3713 SX
INTRODUCTION
ii
DESCRIPTION OF THE MACHINE OPERATION
The source of mechanical energy of this machine is
a naturally aspirated diesel engine (
1
) model Perkins
1104C-44 with direct injection, water cooling, 4 cylinders,
63.5 kW power (86 HP) at 2400 rev/min., max torque
of 302 Nm at 1400 rev./min. or, in alternative, a turbo.-
compressed diesel engine model Perkins 1104C/44T,
with direct injection, water cooling, 4 cylinders, 74.4 kW
power (101 HP) at 2400 rev./min., 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 complete with
elastic joint and with a 1-to-1 ratio, there is Bosch-
Rexroth closed-loop pump for hydrostatic drives,
model A4VG71 (
) with adjustment valve of DA type.
The max displacement of this swashplate pump is 71
cm
3
/rev. 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) (
4
) with priority valve integrated
in the housing (
1
). The displacement of this pump is
43 cm
3
/rev. Its function is to provide hydraulic power,
under form of pressure and flow rate, to the steering
circuit of the machine (priority side) and to the circuit for
the telescopic boom movements (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)
(
5
) with a displacement of 20 cm
3
/rev., is installed on
the PTO of the engine located to the distribution side.
This pump feeds the servo-assisted braking system
(
18
) and the unused oil flow is delivered to the hydraulic
geared motor Casappa (
8
) with a displacement of 20
cm
3
for the operation of the cooling fan mounted on
the heat exchanger (
9
). Inside the motor housing, an
anti-cavitation valve and a pressure limiting valve with
bypass function set at 140 bar, are installed.
The suction lines of the open-loop pumps (
5
) and (
4
)
are protected by an immersed filter (
7
), placed inside
the hydraulic fluid tank (
11
) whose capacity is 120 litres.
Just upstream of the connection with the two suction
lines mentioned above, there is a gate valve with ball
valve which lets you cut out the hydraulic oil tank in
order to perform maintenance interventions on the
machine's hydraulic system. On the contrary, the drive
pump (
) is protected by a cartridge filter (
6
), installed
on the suction line of the booster pump. This pump is an
integral part of the drive pump. The one-way valve (
1
)
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 (
) low-
pressure oil is taken (25-30 bar) and used for the anti-
Summary of Contents for Telelift 3713 SX
Page 4: ...Courtesy of Crane Market...
