FUNCTIONS AND CONTROLS
AB16EJ Plus Maintenance Manual 107
© Mar. 2023
The maximum working envelope limit function is essen-
tial for the safe operation of the machine, because its
malfunction may affect the stability of the machine. It is
recommended to check the maximum working envelope
limit function every 3 months or after 250 hours of
operation.
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.
Horizontal Reach Restriction
A travel switch is used to detect the boom position and
limit the boom from further extending when the boom
length exceeds the maximum horizontal reach.
0kg＜platform load≤250kg (551lb)
1. Start the machine from the ground controller.
2. Move the articulated boom luffing switch to fully re-
tract the articulated boom.
3. Move the main boom luffing switch and the jib boom
luffing switch (if any) to adjust the main boom and
jib arm (if any) horizontal.
4. Move the main boom telescoping switch to extend
the main boom.
5. When the main boom extends to the farthest posi-
tion, the main boom cannot continue to extend nor
be lifted/lowered but can be retracted, and the turn-
table can slowly rotate. Then measure the horizon-
tal reach, which should be 9m (29ft 6in) (distance
from the center of the slewing bearing to the outer-
most side of the platform).
6. Move the main boom telescoping switch to fully re-
tract the main boom.
250kg (551lb)＜platform load≤340kg (750lb)
1. Start the machine from the ground controller.
2. Move the articulated boom luffing switch to fully re-
tract the articulated boom.
3. Move the main boom luffing switch and the jib boom
luffing switch (if any) to adjust the main boom and
jib arm (if any) horizontal.
4. Move the main boom telescoping switch to extend
the main boom.
5. When the main boom extends to the farthest posi-
tion, the main boom cannot continue to extend nor
be lifted/lowered but can be retracted, and the turn-
table can slowly rotate. Then measure the horizon-
tal reach, which should be 8.1m (26ft 7in) (distance
from the center of the slewing bearing to the
outermost side of the platform).
6. Move the main boom telescoping switch to fully re-
tract the main boom.
340kg (750lb)＜platform load≤454kg (1000lb)
1. Start the machine from the ground controller.
2. Move the articulated boom luffing switch to fully re-
tract the articulated boom.
3. Move the main boom luffing switch and the jib boom
luffing switch (if any) to adjust the main boom and
jib arm (if any) horizontal.
4. Move the main boom telescoping switch to extend
the main boom.
5. When the main boom extends to the farthest posi-
tion, the main boom cannot continue to extend nor
be lifted/lowered but can be retracted, and the turn-
table can slowly rotate. Then measure the horizon-
tal reach, which should be 7m (23ft) (distance from
the center of the slewing bearing to the outermost
side of the platform).
6. Move the main boom telescoping switch to fully re-
tract the main boom.
9.5 OVERLOAD LIMIT FUNCTION
The rated load capacity of the platform is clearly speci-
fied in the Machine Specifications section of this man-
ual, and if the platform is overloaded, the machine
operation should be limited.
The proper functioning of the overload limit system is
essential for the safe operation of the machine, because
its malfunction may affect the stability of the machine. It
is recommended to check the overload limit function
every 3 months or after 250 hours of operation.
Select flat, level, unobstructed and solid ground to per-
form the following tests with the platform unloaded:
1. Start the machine.
2. Fully raise and lower the boom and retract and ex-
tend the boom twice separately to ensure that the
machine has no obvious shaking and abnormalities,
and is properly lubricated.
3. After lowering the platform to the stowed position,
gradually apply load to the platform according to the
rated load capacity of the platform.
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.
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