© Feb. 2023
84 TB20J Plus Maintenance Manual
POWER SYSTEM
Fig 41
The mechanical resistance indicator indicates if the re-
sistance for air to go through the dry air filter is too high.
The indicator can be mounted on the air filter outlet. As
dirt accumulates in the filter element, the red mark (1) in
the window will gradually rise. After replacing the filter
element, press the reset button (2) to reset the indicator.
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
• Come off
• Glazed or hardened
If the belt is not properly tensioned, it should be
adjusted:
Fig 42
1. Check the belt tension at its center.
2. Refer to the chart of engine belt tension to select the
correct test gauge and tension value based on the
width of the belt used.
3. Use alternative method (deflection method) to apply
a force of 110N (25lbf) on the V-belt between two
pulleys to check the belt tension. If the deflection of
the pulley center distance per foot exceeds the belt
thickness, the belt tension must be adjusted.
Replace the V-ribbed Belt
It is recommended to replace the V-ribbed belt every 2
years or after 2000 hours of operation.
7.5 WEICHAI WP3.2
1. Fuel injection pump
2. Intake pipe
3. Oil filter
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