PRE-OPERATION INSPECTION
TB20J Plus Operation Manual 25
© Feb. 2023
sure the latches and hinges are in normal work-
ing states, that the platform gate can open and
close properly without bends or damage, and
that the surrounding area is free of obstacles.
The gate should remain closed at all times, ex-
cept for entering/exiting platform and loading/
unloading materials;
2) Ground controller and platform controller–En-
sure that all control switches are off, that joy-
sticks are in the neutral position and can return
to the neutral position after activated and re-
leased, and that all control markings are visible;
3) Platform rotating device;
4) Boom assembly;
5) Jib boom assembly;
6) Cable track system;
7) Turntable and turntable cover;
8) Engine, fuel tank and related components (if
equipped with an engine);
9) Power motor and related components (if
equipped with a power motor);
10) Turntable rotation device;
11) Rotation drive devices (motor, reducer, etc.);
12) Turntable bearings–Ensure that they are accu-
rately lubricated and that no bolts between the
bearing and the machine are loose or missing;
13) Turntable rotation pin (if equipped)–Ensure it
works properly, and ensure that the turntable ro-
tation pin can lock/unlock the turntable;
14) Tire assembly–Ensure that the tire assembly is
firmly secured and wheel nuts are not loose or
missing; check for worn tread, cuts, breakage or
other abnormities;
15) Travel drive devices (motor, reducer, hub, etc.);
16) Tire steering connecting rod and steering con-
necting disc;
17) Hydraulic cylinder, valve block, pump, oil tank,
hoses, pipe joints and other hydraulic parts;
18) Electrical parts such as limit switches and cable
harnesses.
NOTICE
Never forget to inspect the platform floor, which may
reveal conditions that could result in personal injury or
machine damage.
5.4 FUNCTIONAL TEST
Before performing the functional test:
• Choose a solid, flat and horizontal test area.
• Make sure there are no obstructions in the test area.
For telescopic boom with three or more
segments, when checking the extending/
retracting function of the boom, ensure that all
boom segments extend/retract together at the
same speed. In case of any abnormality, there
may be a delay in movement and loose wire
ropes. Please immediately lower the platform to
the stowed position, turn off the machine, and
have the wire rope inspected and repaired by a
qualified service technician.
If any switch/handle returns to the neutral
position and the corresponding movement does
not stop, remove the foot from the foot switch or
pull out the emergency stop button to stop the
machine.
NOTICE
• When the emergency power is in use, do not per-
form two or more functions at the same time, be-
cause certain function operation may have no
response due to small flow in the emergency mo-
tor or pump.
• The emergency power switch can only be used for
a short time (to fully lower and retract the platform
from the maximum angle and maximum length)
when the main power source is not working, be-
cause long-time operation may bring damage to
the motor.
Follow these steps to perform the functional test:
1. With no load applied on the platform, turn the
ground/platform control selector switch on the
ground controller to the ground control position, pull
out the emergency stop button on the ground con-
troller, and perform the following tests from the
ground controller:
1) Make sure that the relevant indicator lights on
the display are on and that no error or alarm
message is displayed during the entire functional
test.
2) Make sure that when the emergency stop button
on the ground controller is pressed, the control-
ler will be powered off, the machine cannot be
started and all functions cannot work.
3) Make sure that the horn sounds properly when
the horn button is pressed.
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