Walker B27i Operator's Manual page 56

Maintenance Instructions
Cleaning
Primary Filter
Element
Canister
Dust Ejection
Valve
Air Cleaner Components
(Shown with Cover Being Removed)
IMPORTANT: The Donaldson air cleaner uses a
dry paper-type air filter element. NEVER apply oil
to the paper element.
Air Filter Restriction Gauge Location
Inspect the paper element after every 100 hours
of service and replace the element and safety filter
every 400 hours (or when dirty or damaged).
More frequent replacement may be required when
operating in extremely dusty conditions as indicat-
ed by the air filter restriction gauge. Service the air
cleaner as follows:
1. Release the top and bottom cover latches and
remove the air cleaner cover. Wash the cover
and dust ejection valve. Check that these
components are in good condition. The dust
ejection valve is subject to wear and deteriora-
tion and should be inspected carefully and
replaced every two years or when damaged.
The lips of the valve should close and fit to-
gether; any cracks, deformation, or wear in the
valve is cause for replacement.
52
Cover
Latch
Cover
Air Filter
Restriction Gauge
Push Button to Reset
Indicator After Service
2. Remove the filter element by pulling it out of
the canister. There will be some initial resis-
tance as the filter seal breaks loose and slides
off of the outlet tube. Gently move the end of
the filter up and down and side to side or twist
to loosen the seal. Use gentle action to mini-
mize the amount of dust dislodged as the filter
is removed.
3. Discard the filter element if excessive air flow
restriction has been indicated by the air filter
restriction gauge and proceed to Step 6.
Clean the filter element by gently tapping on
a flat, hard surface. If excessive restriction
still exists after cleaning the element, it should
be replaced.
NOTE: Use care when cleaning the filter
element. The filter element and/or seal sur-
face may be damaged by tapping too hard or
hitting on an uneven surface or sharp edge.
Washing the element in water or cleaning
solution is not recommended. Do not try to
clean the element with compressed air.
Remember replacing a filter is less expensive
than replacing a dusted engine.
4. Use a bright light inside the element to inspect
for damage. Check the element very carefully
for pin holes or other damage that will allow
dirt to leak through the paper media. Replace
element if necessary.
5. Check the condition and resilience of the radial
sealing surface (inside of the open end) of the
filter. Replace the filter if any cracks, tears, or
other damage to the sealing surface are not-
ed.
6. Without removing, visually inspect the condi-
tion of the safety filter for damage or holes.
The safety filter should only be removed for
replacement every 400 hours (or when dirty
or damaged).
IMPORTANT: Prior to removing the safety
filter, make sure the inside surface of the air
cleaner canister is clean. This will minimize
the risk of dirt entering the outlet tube which
can cause premature engine wear.
7. After removing the safety filter, use a clean,
damp cloth and wipe the interior of the air
cleaner canister clean. Use special care to
clean both the inside and outside surfaces
of the outlet tube.
B27i