21
Design and Function
3.3
Lift arm
The lift arms connect the platform to the frame. Lift and tilt is accomplished with associat-
ed cylinders.
3.4
Underrun protection
Underrun protection reduces the risk of serious or life-threatening injuries in a collision by
another vehicle from behind.
3.5
Platform
The platform is made of steel or aluminium and has a non-slip top surface. The platform
can be a single piece or foldable to take up less space when not in use.
3.6
Hydraulic system
The hydraulic system is engineered to ensure the tail lift enjoys high performance and relia-
bility. An electrically-driven hydraulic pump supplies oil to the product’s hydraulic cylinders
via hoses and valves and to power the hydraulic functions.
Great importance has been given to safety. A bypass valve protects against overloading.
The hydraulic pump motor is fitted with a thermostat that cuts the power supply should the
motor overheat. The hydraulic system is designed to meet statutory lifting speed require-
ments.
The hydraulic cylinders equipped with hose rupture valves protect the platform and any
load from dropping suddenly in the event of a hydraulic hose failure. The tail lift is also
equipped with electrically operated lowering valves on the tilt and lift cylinders. These
valves allow hydraulic oil flow only when electrically actuated, i.e. only when the operator
is operating the lift with one of the control devices. In the event of a hydraulic system leak,
the platform is locked in position by the hydraulic oil captive in the cylinders. The electric
lowering valve also acts as a locking device during transport.
3.7
Control system
ZEPRO tail lifts may be fitted with advanced types of control systems adapted to the specif
-
ic product. The control system controls the hydraulic system and thus the tail lift’s various
functions. The system interprets the operator's pushbutton commands as well as signals
from various sensors in the tail lift structure. In this way, all of the tail lift’s functions can
be controlled by the operator, while the system sensors control automatic functions and
improve safety.
