15
15-35
Cleaning procedure
Cleaning: Element
• Blow a jet of compressed air at a pressure not higher than 685
kPa {7 kgf/cm
2
} against the inside surfaces of the element.
CAUTION
• For the frequency and timing of cleaning, refer to the rele-
vant instruction manual. More frequent cleaning than nec-
essary could damage the element or cause dust and foreign
matter to be sucked into the engine.
• Do not strike the element or hit it against another object to
remove dust.
• Do not blow compressed air against outside surfaces of the
element.
Inspection procedure
Inspection: Element
• Shine some electric light inside the element.
• Replace the element if thin spots or broken parts are evident in
the filter paper, or if the packing at the top of the element is dam-
aged.
Also replace the element if the dust on the element is damp with
oily smoke or soot, regardless of the replacement schedule.
Inspection: Operation of dust indicator under specified neg-
ative pressure
• Apply negative pressure to the dust indicator, and take the read-
ing when the red signal appears in the dust indicator window.
• Replace the dust indicator if found faulty.
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