POWER SYSTEM
TB20J Plus Maintenance Manual 69
© Feb. 2023
horizontal.
3. After the coolant temperature drops below 50°C
(122°F), slowly open the coolant filler cap to check
the coolant level.
4. The coolant level should be between the MIN and
MAX marks on the box body.
5. If necessary, fill with correct coolant according to the
Oil Requirements , and do not overfill the tank.
Empty the Cooling System
1. After the engine and radiator have cooled suffi-
ciently (to the temperature below 50°C/122°F),
carefully remove the pressure cap on the radiator.
Fig 16 Pressure cap on the radiator
2. Place an appropriate container under the discharge
outlet.
3. Loosen the drain valve on the engine oil cooler.
Fig 17 Drain valve on the engine oil cooler
4. Drain the coolant.
5. Reinstall the pressure cap and drain valve.
Fill with Coolant
1. After the engine and radiator have cooled suffi-
ciently (to the temperature below 50°C/122°F),
carefully remove the pressure cap on the radiator.
2. Fill with correct coolant to the maximum mark level
according to the Oil Requirements .
3. Install the coolant filler cap.
4. Run the engine to operating temperature.
5. Turn off the engine.
6. Check the coolant level in the cooled engine.
Intake System
Filtration Principle of Air Filter
• Primary filter: air director (to make the air form a
vortex and remove dirt through the dust bag after the
dust settles to the bottom under the action of gravity
and centrifugal force).
• Secondary filter: main filter element (as major fil-
tration, with the filtration rate of more than 95%).
• Third-stage filter: safety filter element (as auxiliary
filtration while preventing foreign matter from
entering).
Air Filter Service Indicator
The user can find out the air filter blockage by checking
the air resistance indicator installed on the intake pipe
behind the air filter, and when the indication window of
the air resistance indicator changes from green to red
under normal conditions, it indicates that the air intake
resistance exceeds the limit value and the filter needs to
be cleaned or replaced.
Air Filter Maintenance
It is recommended to maintain the air filter every 3
months or after 250 hours of operation.
Air filter housing: Remove the dust in the filter cavity,
air director and dust bag, and do not throw the air direc-
tor away without recognizing its function.
Main filter element: Remove the dust from the surface
of the filter element with a brush, then blow the element
with compressed air (pressure of 0.4-0.6MPa/58-87psi)
from the inside to the outside.
Safety filter element: clean it by hand patting and avoid
blowing with air.
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