AB16EJ Plus Maintenance Manual 33
© Mar. 2023
5 CHASSIS AND TURNTABLE
ASSEMBLY
5.1 CHASSIS AND TURNTABLE
SYSTEM
Chassis Tilt Sensing System
The chassis tilt sensing system measures the angle of
the chassis relative to the horizontal level by means of a
level sensor mounted in the left turntable cover. The
chassis tilt indicator on the platform display panel indi-
cates if the chassis inclination exceeds the maximum al-
lowable tilt angle. When the chassis tilt sensing system
detects that the chassis inclination exceeds the maxi-
mum allowable tilt angle, the chassis tilt indicator will
flash, all movements will be blocked (in the operating
position), the boom will be allowed to retract and lower
and the turntable will be allowed to rotate slowly (in the
non-operating position).
Travel Drive System
This machine adopts four-wheel drive. The drive system
consists of four independently-controlled asynchronous
AC motors, each connected to a corresponding travel
reducer. Each motor is equipped with a speed sensor
that transfers speed information to the corresponding
motor controller. The operator can provide the drive
speed and direction command to the control system
through the handle on the platform controller, and the
system will calculate the allowable travel speed of the
machine at this time according to the travel distance of
the handle and the position of the boom, see Page 33,
Travel Speed Reduction System for details.
Travel Speed Reduction System
When the boom is in the operating position, the travel
speed of the machine is automatically limited to the op-
erating speed.
Reverse Drive Confirmation System
The reverse drive confirmation system warns the opera-
tor of the situation that may cause the machine to travel
and steer in the direction opposite to the travel direction
of the joystick. The reverse position indicator on the plat-
form controller indicates such situation. When the boom
is positioned between the two rear wheels, the system
does not impose any restrictions on the travel of the ma-
chine. If the boom is positioned beyond any rear wheel
while the machine is traveling, the reverse position indi-
cator will flash, and the machine's driving and steering
functions will be blocked. To restore the driving and
steering functions, press the reverse position travel
drive switch on the platform controller, then the reverse
position indicator will be lit, indicating that the driving
and steering direction of the machine is opposite to the
travel direction of the joystick.
Auxiliary Power System
The batteries in one of the two battery boxes provide
power to a 24V DC motor which drives the gear pump to
provide auxiliary power for the machine. When the main
power source fails, the auxiliary power system can be
used to lower the operator in the platform to the ground.
The auxiliary power system cannot be used as the main
power source to drive the travel function, but can be
used to return the machine to the stowed position in a
short time.
Outrigger Oscillating System
If the machine is equipped with oscillating function, it
must have outrigger oscillating system. Both the front
axle and rear axle are connected to the chassis by shaft,
and the telescoping action of the oscillating cylinders on
both sides of the front axle is controlled by the oscillating
multi-way valves behind the chassis. If there is relative
displacement between the chassis and the rear axle,
the oscillating multi-way valve will be triggered and start
to control the oscillating cylinder to perform correspond-
ing telescoping action. This action does not require aux-
iliary electrical components for detection, nor does it be
subject to any conditions, and oscillating in all working
conditions can be achieved. So, the machine’s four
wheels can always contact with the ground even when
driving on rough and uneven ground, which greatly im-
proves the trafficability and operating comfort.
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