Lull 944E-42 Operation Manual - Manual (Page 131)

Section 7 - Lubrication and Maintenance
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B. Element Change (as restriction indicator indicates)
If air filter restriction indicator remains on after start up or illuminates during
operation, perform the following:
1. Unlock air cleaner cover (3) and remove from air cleaner canister (4).
2. Remove outer primary element (5) and inspect for damage. Damaged elements
should not be reused.
3. Thoroughly clean the interior of the air cleaner canister and vacuator valve.
4. Replace inner safety element (6) after every third primary element change. If
replacing the inner safety element at this time, carefully slide the element out
and replace with new element.
5. Slide the new primary element over the inner element making sure the sealing
edge is flush with the base of the air cleaner.
6. Position air cleaner cover in place and lock into position.
7. Close and secure the engine cover.
Note: An inner safety element should never be washed or reused. Always install a
new element.