General - Zepro Z 150-135 Installation Instruction

Technical description
The ZEPRO-lift is electro-hydraulically driven. An
electric motor which gets its power from the truck's
ordinary battery drives a hydraulic pump which supp-
lies oil via hoses and pipes to the working hydraulic
cylinders. The system is steered by electrical valves.
The hydraulic power unit with all details is built into
the lift's support frame. The control system is built
into a seperate box. Both systems are easy to reach
for service and maintenance.
The platform is supported by the lift arm which is
very strong and rigid. The underrun protection bar is
directly attached to the support frame. The platform
has a non-slip surface.
The lift arm lifting work is done by lift cylinders which
have built in safety valves for protection against
hose breakage. The lift cylinder circuit is equipped
with 1 or 2 electric safety valves, which are leak-
proof. These safety valves can also act as an extra
transport lock for the platform. The valves are built
into the cylinders.
The platform's tilt function is also provided by cy-
linders with similar design to the lift cylinders. Tilt
cylinders can have one speed operation. The tilt
cylinder circuit is also equipped with 1 or 2 electric
safety valves. Lifting and tilting up and down speeds
are fixed by the pump capacity. Lowering speed are
controlled by a special constant flow valve. These
valve give the same speed independent of the load.
The cylinder piston rods are treated with carbon
nitriding which gives them very long life.
The hydraulic system is protected with a pressure
regulator when lifting or tilting up.
Note! This regulator does not prevent overload at
rest position or lowering.

2. General

The electric power is taken from the truck's ordinary
starter motor. Control current is taken from the dash
board. When the control current's isolator (cabin)
switch is off, the lift is "locked".
To save current the control current should be swit-
ched off when the lift is not used.
The lift can also be operated from other, optional
units.
To ensure safe operation even with very long control
cables, the hydraulic unit is equipped with relays.
The relays situated in the electrical connection box
placed in the support frame steer current directly
from the main cable to the valves and the main
switch for the motor.
The electric motor is equipped with a thermostat
which breaks the current if the motor becomes over-
heated. The motor will stop until it is cool again.
The platform can be tilted to all positions from verti-
cal to 10° below the horizontal. It has a mechanical
or electric lock which must be activate during trans-
port.
Hydraulic oil
A tail lift should operate just as well in tropical as
in arctic climates. Heat does not adversely effect
the hydraulic oil, however, low temperatures are
more critical. ZEPRO therefore supply a hydraulic
oil that meets the demands across the temperature
range. ZEPRO oil (art.no 21963 for 1 litre) is made
of a highly refined mineral oil, the lubricant additive
is free from zinc and gives good protection against
component wear. The hydraulic oil's low temperature
properties and high viscosity index allow hydraulic
system start in a very cold climate and give reliable
functioning with varying temperature conditions. With
ZEPRO oil the hydraulic system also receives a very
good protection against corrosion.
ZEPRO also has a biologically degradable oil (art.
no 22235 for 1 litre) available which is based on a
synthetic base oil. This also provides very good pro-
perties at low and high temperatures. It is even liquid
down to -50° C. Resistance to oxidation is extremely
good which gives long lifetime with longer intervals
between oil changes. Good filtration and air sepera-
tion together with low density make the oil easy to
pump. This minimises risk for cavitation and deve-
lopment of scum. Contact us for more information.
NB. Neither ATF nor HF oil should be used in the ZE-
PRO hydraulic circuit as they can damage the rubber
in the sealing kits and reduce their lifetime.
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