© Feb. 2023
70 TB20J Plus Maintenance Manual
POWER SYSTEM
Replace the Air Filter Element
It is recommended to replace the air filter element every
3 months or after 250 hours of operation, or replace the
entire filter after maintenance of the air filter for 3-4
times.
Before installing the element, check if the sealing gasket
is damaged or missing. For tightening, first rotate the el-
ement to make it positioned in place, and ensure air-
tightness to avoid air flow short-circuit.
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
Check the tension of the belt frequently during use to
ensure the belt is properly tensioned. If the belt is too
loose, it will reduce the transmission efficiency and de-
crease the speed of the water pump, fan and generator,
affecting the cooling effect, while the vibration generated
will cause unnecessary wear of the belt and pulley. If the
belt is too tight, it will shorten the service life of the belt,
bearings and other parts.
Belt deflection detection: Generally, when a force of 40–
50N (9–11lbf) is applied between two pulleys, the belt
will deflect 3-5mm (0.1-0.2in).
Replace the Belt
It is recommended to replace the belt every 2 years or
after 2000 hours of operation.
NOTICE
For applications with multiple belts, the entire set of
drive belts needs to be replaced, and replacing only
one belt in a set will make the new belt bear more
loads, because the old belt has been stretched, and
the additional load will be applied to the new belt,
causing the new belt to break.
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