© Feb. 2023
68 TB20J Plus Maintenance Manual
POWER SYSTEM
no venting screw, loosen the oil outlet connection of
the fine filter), press the hand pump on the pre-filter,
tighten the venting screw (or oil outlet connection)
on the fine filter when there is continuous bubble-
free fuel flowing out of the venting screw (or fine fil-
ter oil outlet).
Note: The oil outlet on the fine filter is gen-
erally indicated by an arrow, and what
needs to be loosened is the connection
with the oil pipe.
3. Loosen the venting screw on the fuel injection
pump, press the hand pump on the pre-filter, and
tighten the venting screw on the fuel injection pump
after there is continuous bubble-free fuel flowing out
of the venting screw.
4. Continuously press the hand pump on the pre-filter
to keep more fuel flowing into the injection pump.
5. After the engine starts, it is recommended to run the
engine at idle speed for 2min-3min, and then run it
at 60%-80% of the rated speed for 3min-5min to
fully empty the air in the fuel line.
Lubrication System
Check the Engine Oil Level
1. Turn off the engine.
2. Make sure that the machine and engine are
horizontal.
3. Remove the oil dipstick from the engine and wipe
the dipstick with non-fiber cleaning cloths.
4. Put the clean dipstick back to its original position.
5. Remove the dipstick again and check the oil level,
which should be between the FULL (HOT) mark and
LOW (COLD) mark on the dipstick.
6. If necessary, fill with correct engine oil to the FULL
(HOT) mark on the dipstick according to the Oil Re-
quirements , and do not overfill the tank.
Change the Engine Oil
It is recommended to change the engine oil every 6
months or after 500 hours of operation.
NOTICE
• Every time the engine oil is changed, the engine
oil filter must also be replaced.
• Changing the oil with the engine warmed up can
make the engine oil flow smoother and remove
more impurities.
1. Before changing the oil, warm up the engine so that
the engine oil reaches approximately 80°C (176°F),
and then turn off the engine.
2. Make sure that the machine and engine are
horizontal.
3. Place an appropriate oil-collecting vessel under the
engine oil drain valve.
4. Open the drain valve to allow the oil to flow out.
Hot engine oil poses a risk of burns, so avoid
contact with hot oil when draining oil.
5. Install the drain valve after the oil is fully drained.
6. Fill with correct and clean engine oil according to
the Oil Requirements , and never overfill the tank.
7. Warm up the engine so that the engine oil reaches
approximately 80°C (176°F) and then shut down the
engine.
8. Check the oil level, which should be in the proper
position.
Replace the Engine Oil Filter Element
It is recommended to replace the engine oil filter ele-
ment every 6 months or after 500 hours of operation.
NOTICE
Do not pre-fill the filter, or the filter may be
contaminated.
1. Place an appropriate oil-collecting vessel under the
engine oil filter.
2. Use a special tool to loosen and unscrew the filter
element.
3. Collect the drained fuel.
4. Wipe the sealing surface of the filter holder with
clean, non-fiber cloths.
5. Apply a thin layer of oil to the sealing surface of the
new filter.
6. Screw on the new filter by hand until the gasket is
touching, then tighten it with proper torque.
Cooling System
It is recommended to replace the coolant every year or
after 1000 hours of operation.
Check the Coolant Level
1. Turn off the engine.
2. Make sure that the machine and engine are
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