Precleaner Section; Cleaning Precleaner Tubes; Cleaning Filter Element With Compressed Air; Removing Dust From Precleaner Tubes - Komatsu 930E-2 Shop Manual

FIGURE 5-4. CLEANING FILTER ELEMENT WITH
COMPRESSED AIR
2. Clean dust loaded elements with dry filtered com-
pressed air:
a. Maximum nozzle pressure must not exceed 30
psi (207 kPa). Nozzle distance from filter ele-
ment surface must be at least one inch (25 mm)
to prevent damage to the filter material.
b. As shown in Figure 5-4, direct stream of air from
nozzle against inside of filter element. This is the
clean air side of the element and air flow should
be opposite of normal air flow.
c. Move air flow up and down vertically with pleats
in filter material while slowly rotating filter ele-
ment.
d. When cleaning is complete, inspect filter ele-
ment as shown in Figure 5-3 and if holes or
ruptures are noted, discard the element.

Precleaner Section

The tubes in the precleaner section of the air cleaner
assembly should be cleaned at least once annually and
at each engine overhaul. More frequent cleaning may
be necessary depending upon operating conditions
and local environment should tubes become clogged
with oil, sludge or dirt.
To inspect tubes in precleaner section, remove main
filter element. Do not remove the safety element.
Loosen clamps and remove dust collector cup. Use a
light to inspect the tubes, all tubes should be clear and
the light should be visible.
Clean the tubes as follows if clogging is evident.
C5-4
FIGURE 5-5. REMOVING DUST FROM

Cleaning Precleaner Tubes

Both the main and safety elements must be in-
stalled in the air cleaner while Steps 1 and 2 are
being accomplished to prevent any possibility of
dirt being forced into the engine intake area.
1. Dust can be removed with a stiff fiber brush. DO
NOT use a wire brush. Dust may also be removed
effectively using compressed air.
2. Heavy plugging of tubes may require soaking and
washing of complete precleaner section. The fol-
lowing instructions cover these procedures.
NOTE: The precleaner section may be separated from
the air cleaner assembly without dismounting the com-
plete air cleaner from the truck.
3. Remove the air intake cover (3, Figure 5-1). Re-
move capscrews and locknuts holding precleaner
section to the cleaner assembly and remove pre-
cleaner. The safety element must remain in place
to protect the engine intake.
4. Loosen clamps and remove dust collector cup (1)
from precleaner section. Wash dust cup with
water and liquid soap solution.
Air Filtration System
PRECLEANER TUBES
C05013 5/98