POWER SYSTEM
TB20J Plus Maintenance Manual 63
© Feb. 2023
5. Install the locking screw #1 with a new sealing ring.
6. Install the cooler locking cap.
Fill with Coolant
1. After the engine and radiator have cooled suffi-
ciently (to the temperature below 50°C /122°F),
carefully open the coolant filler cap.
2. If necessary, loosen the venting screw on the
cooler.
3. Fill with correct coolant to the maximum mark level
according to the Oil Requirements .
4. Install the coolant filler cap.
5. Run the engine to operating temperature.
6. Turn off the engine.
7. Check the coolant level in the cooled engine.
Intake System
Fig 6 Air filter
1. Clamping yoke
2. Filter hood
3. Filter element
4. Safety cartridge
5. Hex bolt
Air Filter Service Indicator
Fig 7 Air filter service
indicator
1. Red field
Clean or replace the filter as indicated by the service in-
dicator or service gauge mounted on the air filter intake
pipe. Cleaning or replacement is required when:
• The yellow indicator of the service switch flashes
with the engine running;
• The red field of the service indicator is fully visible.
After maintenance, push the reset button of the service
gauge. The service indicator is ready for operation
again.
Maintain the Air Filter
1. Lift up the clamping yoke.
2. Remove the filter hood and pull out the filter
element.
3. Check the filter element:
1) Blow out with dry compressed air (max.
0.5MPa/72.5psi) from the inside to the outside if
soiling is only slight;
2) Renew if heavily soiled.
Replace the Safety Cartridge of Air
Filter
It is recommended to replace the safety cartridge of air
filter every 3 months or after 250 hours of operation, or
as indicated by the status indicator.
NOTICE
Never clean the safety cartridge.
1. Unscrew the hex bolt and pull out the safety
cartridge.
2. Install a new safety cartridge and screw on the hex
bolt.
3. Install the filter element, mount the filter hood and
secure it with the clamping yoke.
Belt Drive
• Do not carry out work on the belt drive unless
the engine is at standstill.
• After repairs: Check that all protective devices
have been installed and that all tools have
been removed from the engine.
Inspect the Belt
The belt should be replaced/reinstalled immediately if
the belt has:
• Cracked or broken
• Worn or unaligned
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