© Feb. 2023
46 TB20J Plus Maintenance Manual
CHASSIS AND TURNTABLE ASSEMBLY
2. Install the mounting plate #1 of the hydraulic gener-
ator and secure it with bolt #2 and nut #3.
3. Use suitable lifting equipment to lift the hydraulic
generator #4 above the turntable counterweight,
and adjust the orientation (refer to the placement
position in the dotted box A in the figure above) so
that the hydraulic generator can enter the turntable
structure smoothly.
Always check the position of the hydraulic
generator during the installation process to
ensure that the hydraulic generator does not
interfere with other parts of the machine.
4. Then, rotate the hydraulic generator 90° to adjust its
direction (refer to the position C in the figure above).
5. Align the mounting holes of hydraulic generator with
the mounting holes in the mounting plate #1.
6. Install and secure the hydraulic generator with bolt
#5 and nut #6.
Debugging
After the hydraulic generator is installed, the machine
needs to be debugged as follows:
1. Start the engine, and after the engine operates sta-
bly, move the hydraulic generator switch to warm up
the hydraulic system until the oil temperature ex-
ceeds 45°C (113°F).
2. Measure whether the output voltage of the genera-
tor meets the requirements of use. If the output volt-
age is less than the required voltage, the motor runs
too slow; if the output voltage is too high, the motor
runs too fast.
3. The speed of the motor depends on the input flow
rate, so the output voltage can be used to determine
whether the motor flow rate is appropriate. The posi-
tion of the flow valve is shown by the arrow in the
figure below. Adjust the valve clockwise to decrease
the flow rate, or counterclockwise to increase the
flow rate. Adjust the flow valve based on the output
voltage until the output voltage meets the require-
ments of use in your region.
Fig 16 Diagram of flow valve
NOTICE
If the flow valve is fully opened, but the voltage
still can not meet the requirements of use, the
reason may be that:
• The hydraulic system does not warm up suffi-
ciently, so the oil temperature has not reached
the required temperature. Wait for the oil tem-
perature to rise above 45°C (113°F), then de-
termine the output flow based on the actual
output voltage, and adjust the flow valve until
the voltage reaches the requirements of use;
• The pump LS set pressure is too low, resulting
in insufficient output flow of the pump, so the
LS set pressure needs to be increased.
4. After the voltage is adjusted, run the machine with
or without load for about 30min. If the motor makes
a buzzing sound or the pump outlet hose vibrates at
certain frequency, the pump LS set pressure value
is not suitable and needs to be decreased. Turn the
screw in the figure below clockwise to increase the
LS set pressure value, or counterclockwise to de-
crease the LS set pressure value.
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