© Feb. 2023
66 TB20J Plus Maintenance Manual
POWER SYSTEM
Fuel System
Check the Fuel Level
The fuel level can be checked from the energized
ground controller display or platform controller display.
Fig 11 Fuel level (ground controller)
Fig 12 Fuel level (platform controller)
Fill the Fuel Tank
Turn off the engine, fill with correct diesel fuel according
to the Oil Requirements , and never overfill the tank.
• Do not mix gasoline, alcohol, or their mixture
with diesel fuel.
• Do not refuel the machine while the engine is
running.
• Due to the extremely accurate tolerance match
of the diesel injection system, it is critical to
keep the fuel clean and free of dirt or water.
The dirt or water entering the combustion sys-
tem can cause severe damage to the fuel pump
and injectors.
Replace the Fuel Filter Element
It is recommended to replace the fuel filter element
every 6 months or after 500 hours of operation.
Replace and Drain the Fuel Pre-filter
It is recommended to drain the fuel pre-filter daily and
replace the fuel pre-filter element every 6 months or
after 500 hours of operation.
Empty the fuel pre-filter:
1. Turn off the engine.
2. Place an appropriate collecting vessel under the
drain valve.
3. Disconnect the cable harness.
4. Open the drain valve to allow the liquid to flow out
completely.
5. Mount the drain valve.
6. Connect the cable connectors.
Replace the fuel pre-filter:
1. Turn off the engine.
2. Close the fuel shut-off valve to disconnect the fuel
supply to the engine (with high-lying tank).
3. Place an appropriate oil-collecting vessel under the
drain valve.
4. Disconnect the cable harness.
5. Open the drain valve to allow all liquid to flow out.
6. Remove the filter element.
7. Clean any dirt off the sealing surface of the new filter
element and opposite side of the filter head with
clean, non-fiber cloths.
8. Apply a thin layer of oil to the sealing surface of the
new filter element.
9. Screw on the new element by hand until the gasket
is touching, then tighten it with proper torque.
10. Mount the drain valve.
11. Open the fuel shut-off valve to vent the fuel lines.
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