© Feb. 2023
86 TB20J Plus Maintenance Manual
POWER SYSTEM
It is recommended to replace the fuel filter element
every 6 months or after 500 hours of operation.
Fig 45 Fuel filter
1. Fuel filter bracket
2. Primary filter
element
3. Water level sensor
4. Waterproof port
1. Turn off the engine.
2. Remove the old fuel filter element and remove the
water collector on the primary filter if it is still usable.
3. Lubricate the seal.
4. Screw on the filter by hand until the seal is con-
nected to the connector.
5. Continue tightening the filter by hand until the filter
is securely seated (approximately 3/4 turn).
6. Perform leakage test.
Vent the Fuel Lines
NOTICE
Failure to vent the fuel lines may bring damage to the
high-pressure pump of the injection system.
To avoid false fault messages, do not attempt to start
the fuel system while venting.
1. Open the fuel tank valve and loosen the venting
screw on the fuel pre-filter.
2. Press the hand pump on the fuel pre-filter to vent
the fuel system.
3. Tighten the venting screw.
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.
Fig 46
1. Filler cap
2. Drain plug
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.
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