© May 2023
100
GTZZ14EJ&16EJ Maintenance Manual
FUNCTIONS AND CONTROLS
9.3 TILT PROTECTION FUNCTION
The proper functioning of the tilt sensing system is es-
sential for the safe operation of the machine. It is recom-
mended to check the tilt sensing system every 3 months
or after 250 hours of operation.
Select flat, level, unobstructed and solid ground to per-
form the following tests:
In the non-operating position:
1. Start the machine.
2. Push the level switch in the X (left-right)/Y (front-
rear) direction by more than 5°. Then, the tilt alarm
should be triggered, the chassis tilt indicator should
flash, and no actions will be restricted.
3. Place two wooden blocks with the dimensions
shown in the table below before the two wheels on
the left (or right) side of the machine and drive the
machine onto these two blocks. Then, the tilt alarm
should be triggered, the chassis tilt indicator should
flash, and no actions will be restricted.
4. Drive the machine off the wooden blocks and re-
move the wooden blocks.
5. Place two wooden blocks with the dimensions
shown in the table below before the two front (or
rear) wheels of the machine and drive the machine
onto these two blocks. Then, the tilt alarm should be
triggered, the chassis tilt indicator should flash, and
no actions will be restricted.
6. Drive the machine off the wooden blocks and re-
move the wooden blocks.
In the operating position:
1. Start the machine.
2. Push the level switch in the X (left-right)/Y (front-
rear) direction by more than 5°. Then, the tilt alarm
should be triggered, the chassis tilt indicator should
flash, and certain actions will be restricted. The
main boom can be retracted, the articulated boom
can be lowered, the turntable can rotate slowly, and
the main boom can be lowered after fully retracted.
3. Place two wooden blocks with the dimensions
shown in the table below before the two wheels on
the left (or right) side of the machine and drive the
machine onto these two blocks. Then, the tilt alarm
should be triggered, the chassis tilt indicator should
flash, and certain actions will be restricted. The
main boom can be retracted, the articulated boom
can be lowered, the turntable can rotate slowly, and
the main boom can be lowered after fully retracted.
4. Adjust the boom tube to the non-operating position,
drive the machine off the wooden blocks and re-
move the wooden blocks.
5. Place two wooden blocks with the dimensions
shown in the table below before the two front (or
rear) wheels of the machine and drive the machine
onto these two blocks. Then, the tilt alarm should be
triggered, the chassis tilt indicator should flash, and
certain actions will be restricted. The main boom
can be retracted, the articulated boom can be low-
ered, the turntable can rotate slowly, and the main
boom can be lowered after fully retracted.
6. Adjust the boom tube to the non-operating position,
drive the machine off the wooden blocks and re-
move the wooden blocks.
NOTICE
If the machine operation cannot be accurately
restricted during the test, please immediately lower
the platform to the stowed position, turn off and mark
the machine, and contact a qualified service
technician for inspection and repair.
Table 9-1 Wooden block dimension
Wooden block position Length
Width
Height
Left (or right) wheel 750mm (2.46ft) 250mm (0.82ft) 127mm (0.42ft)
Front (or rear) wheel 750mm (2.46ft) 250mm (0.82ft) 166mm (0.54ft)
9.4 MAXIMUM WORKING
ENVELOPE LIMIT FUNCTION
The machine system can detect the position of the
boom by means of the travel switch mounted on the
boom tube. When the system detects the boom in the
limit position, the boom movement will be restricted.
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