Maintenance Instructions
H37i
Cleaning
54
Inspect the primary filter element
after every 100
hours
of service and
replace
the element and
safety filter
yearly
(or when dirty or damaged).
More frequent replacement may be required when
operating in extremely dusty conditions. 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
yearly
or when damaged. The lips of
the valve should close and fit together; any
cracks, deformation, or wear in the valve is
cause for replacement.
2. Remove the primary filter element by pulling it
out of the canister. There will be some initial
resistance 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 minimize the amount of dust dislodged as
the filter is removed.
3. Clean the filter element by
GENTLY tapping
on a
flat, hard
surface.
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 paper element in water or clean-
ing solution is
not recommended.
Do not try
to clean the element with compressed air. Do
not oil the paper element. Remember, replac-
ing a filter is less expensive than replacing a
dusted engine.
4. Use a bright light inside the filter 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 filter element if dirty or damaged.
5. Check the condition and resilience of the radial
sealing surface (inside of the open end) of the
primary filter element. Replace the filter if any
cracks, tears, or other damage to the sealing
surface are noted.
6. Without removing, visually inspect the condi-
tion of the safety filter for damage or holes.
The safety filter should only be removed for
yearly replacement
(or when dirty or dam-
aged).
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.
IMPORTANT:
Any dust left on the inside of
the outlet tube will go into the engine and
cause wear.
8. Check the outside surface of the outlet tube
for smoothness and cleanness (this is the
sealing surface).
9. Insert and seat the safety filter and primary
filter el ement carefully into the canister, apply-
ing pres sure at the outer rim of the filter; not at
the flexible center. Make sure the filter ele-
ment is completely in place before installing
the cover.
IMPORTANT: DO NOT use
the
cover latch-
es
to force the filter into the canister–the cover
should fit on with
no extra force.
NOTE: DO NOT
use petroleum based lubri-
cants on the sealing surfaces of the filter ele-
ments; use tal cum powder or dry silicone
lubricants if required for filter installation.
Canister
Primary
Filter Element
Safety Filter
Radial Sealing
Surface
Outlet Tube
Air Filter Element Replacement
