GTZZ14EJ&16EJ Maintenance Manual 35
© May 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 two-wheel drive. The drive system
consists of two 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 joystick 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 joystick and the position of the boom, see Page 35,
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.
5.2 TIRE ASSEMBLY
Check Tires and Rims
Check the tires and rims daily and replace the tire if any
of the following defects is found:
• The tire is severely cracked, broken, deformed or
has other abnormalities.
• The tire ply has a smooth, uniform cut with a total
length of more than 75mm (3in).
• The tire ply has a crack or fissure that exceeds
25mm (1in) in either direction.
• The tire has a perforation with the diameter of over
25mm (1in).
• The tire has a large bulge.
• The wear extent of the tire’s off-ground support sur-
face exceeds 25%.
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