CHASSIS AND TURNTABLE ASSEMBLY
TB20J Plus Maintenance Manual 45
© Feb. 2023
5.5 COUNTERWEIGHT
Counterweights are essential to maintain the
stability of the machine. Do not modify or remove
counterweights without the manufacturer's
written authorization. Improperly assembled
counterweights may cause the machine to tip
over, causing serious injury, death, or machine
damage.
Disassembly
1. Adjust the machine to the stowed position and make
sure the turntable is locked (if equipped with a rotary
pin, make sure the rotary pin is locked).
2. Use suitable lifting equipment to provide reliable
support for the boom and prevent the machine from
tipping after the counterweight is removed.
3. Use suitable lifting equipment to support the
counterweight.
4. Remove the bolts securing the counterweight to the
turntable.
5. Slowly remove the counterweight with the aid of the
lifting equipment.
Installation
1. Use suitable lifting equipment to lift the counter-
weight to the installation position on the turntable.
2. Align the mounting hole of the counterweight with
that of the turntable structure.
3. Apply Loctite 272 threadlocking adhesive to the fas-
tening bolt threads and counterweight threads, and
install the bolts one by one.
4. Confirm that the bolts are tightened with the correct
torque, refer to the Torque Specifications section
for the tightening torque.
5.6 HYDRAULIC GENERATOR
Fig 15 Diagram of installing hydraulic generator
Installation
The hydraulic generator is optional, so please find out
whether the machine can be installed with a hydraulic
generator firstly.
1. Raise the boom tube about 45° to leave enough
space for the installation of the hydraulic generator.
If the boom is not lifted by lifting equipment,
do not work under the platform or boom.
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