MAINTENANCE PROCEDURES
TB18 Plus&20J Plus Maintenance Manual 5-23 © Apr 2022
300kg（661 lb）≤platform capacity≤454kg（1000
lb）
1. Turn the Ground/Platform select switch at
ground controls to the Ground.
2. Pull out the emergency stop button at the
ground controls to ON position.
3. Turn the key switch at ground controls to ON
position.
4. Using the main boom lift and jib up/down
function, adjust the main boom and jib boom to
horizontal.
5. Using the main boom telescope function, extend
the main boom.
6. TB18 Plus：when the boom extends to the
farthest(the ground display reads 15.45m of
boom length), the buzzers at the ground and
platform controls should be sounding, boom
further extending and boom up/down should be
restricted, but boom retracting and turntable
rotating should be allowed.
7. TB20J Plus：when the boom extends to the
farthest(the ground display reads 14.6m of
boom length), the buzzers at the ground and
platform controls should be sounding, boom
further extending and boom up/down should be
restricted, but boom retracting and turntable
rotating should be allowed.
8. Using the main boom telescope switch, retract
the boom.
9. The boom can be fully retracted.
Inspecting angle sensor
1. Turn the Ground/Platform select switch at
ground controls to the Ground.
2. Pull out the emergency stop button at the
ground controls to ON position.
3. Turn the key switch at ground controls to ON
position.
4. Using the main boom lift and jib up/down
function, adjust the main boom to horizontal and
jib boom to the highest.
5. Using the main boom lift function, raise/lower
the main boom to limits.
6. When the main boom is raised to the upper limit
of lift angle(ground display reads 73°[±1°]）, the
boom should be prevented from further raising.
7. When the main boom is lowered to the lower
limit of lift angle(ground display reads -12°
[±1°]）, the boom should be prevented from
further lowering.
8. Using the boom telescope and up/down
function, retract and lower the boom.
9. The boom can be fully retracted.
Note：The allowable tolerance of the angle sensor
should not exceed 0.5° over the full range of
measurement.
B-10 Inspect Engine Exhaust System
Inspecting engine exhaust system is vital to proper
engine operation and extending service life.
NOTICE
Shut off the engine before inspection.
1. Inspect whether the engine exhaust pipe is
damaged or crushed flat.
2. Inspect whether the exhaust pipe is tightly
connected.
3. Inpsect whether the muffler shows signs of heating
fatigue or possiblity of interal malfunction.
4. Inspect the catalytic converter for blockage.
5. Tighten or replace parts, if needed, to ensure the
exhaust system is free of leakage.
B-11 Inspect Drive Reducer Oil Level
Inappropriate gear oil level of drive reducers will reduce
the machine performance, and continued use could
result in component damage.
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