or damage.
4.2.3 Fine filter
The fine filter is composed of the main filter
element and the safety filter element.
The main filter should be maintained when the
indicator alarms or every 200-250 working hours
（2000km）.
The safety filter element is only used as second
protection and may not be cleaned.
Maintenance method:
① Unscrew the fixing nut, and carefully remove the
main filter; ② Blow off the dust on the main filter
element with clean air below 0.5MPa diagonally
from the inside to outside; ③ Check the filter
element inside and outside and the seal ring for any
damage; ④ Clean the air filter housing inside, and
check the inner filter element for damage; ⑤ Place
the outer filter element gently back into the filter
housing, and check whether the outer filter ring
comes into contact with the housing; ⑥ Determine
that the outer filter element has been installed in
place, and tighten the nut and insert the spring pin
into the pin hole.
The main filter element and safety filter element
should be replaced in the following conditions:
① The main filter has been damaged; ② After the
indicator is cleaned and installed, it still alarms:
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