© Feb. 2023 136 TB20J Plus Maintenance Manual
FUNCTIONS AND CONTROLS
10.3 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 block and remove
the wooden block.
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 block and remove
the wooden block.
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. But the
boom can be retracted, and then lowered after re-
tracted to less than 1.2m (3ft 11in), and the turntable
can rotate slowly.
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. But the
boom can be retracted, and then lowered after re-
tracted to less than 1.2m (3ft 11in), and the turntable
can rotate slowly.
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. But the boom can
be retracted, and then lowered after retracted to
less than 1.2m (3ft 11in), and the turntable can ro-
tate slowly.
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 10-1 Wooden block dimension
Wooden block position Length
Width
Height
Left (or right) wheel 750mm (2.46ft) 250mm (0.82ft) 188mm (0.62ft)
Front (or rear) wheel 750mm (2.46ft) 250mm (0.82ft) 218mm (0.72ft)
10.4 MAXIMUM WORKING
ENVELOPE LIMIT FUNCTION
The system detects the position of the boom tube by
means of the angle sensor and length sensor on the
boom head (near the turntable). When the system de-
tects the boom in the maximum position, the boom
movement will be restricted.
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