© Feb. 2023
74 TB20J Plus Maintenance Manual
POWER SYSTEM
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. Remove one of the oil filter covers in the figure be-
low to ventilate the engine crankcase for easier oil
drainage.
Fig 23
5. 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.
6. Install the drain valve after the oil is fully drained.
7. Fill with correct and clean engine oil according to
the Oil Requirements , and never overfill the tank.
8. Warm up the engine by running it for 5 minutes and
check for engine oil leaks.
9. After the engine is warm, shut it off and let it sit for
10 minutes.
10. Recheck the engine oil level.
11. Add engine oil to the engine oil filler port as needed
until the level is between the upper and lower lines
shown on the dipstick.
12. Install the oil filter cover.
Replace the 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.
Fig 24
1. Drain plug
2. Engine oil filter
3. Counterclock-
wise
4. Clockwise
1. Place an appropriate oil-collecting vessel under the
engine oil filter.
2. Turn the engine oil filter counterclockwise using an
oil filter wrench.
3. Collect the drained fuel.
4. Wipe the mounting surface of the oil filter with clean,
non-fiber cloths.
5. Apply a thin layer of oil to the sealing surface of the
new filter.
6. Screw on a new filter clockwise by hand until the
gasket is touching, then tighten it with an oil filter
wrench.
7. Add new engine oil to the engine as necessary.
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