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WALKER MANUFACTURING COMPANY
July 2006
SERVICE INSTRUCTIONS
Donaldson Radialseal™ Air Cleaner - Model MS, MC,
MD, MT, MTL
A remote mounted Donaldson Radialseal™ air cleaner
provides the air filtering function. The paper filter ele-
ment slides over an outlet tube inside the air cleaner
canister with radial sealing action, eliminating the pos-
sibility of dust leaks due to improper filter installation.
Intake design, internal baffling, and a Vacuator™ valve
provide dust separation and automatic precleaning ac-
tion. Daily or frequent servicing of the air cleaner is not
required. Use the air restriction gauge on the air clean-
er outlet to indicate when the air filter needs servicing -
a red flag will appear when the filter is overly restricting
airflow into the engine.
IMPORTANT: Use only Donaldson air filter
elements for replacement (Donaldson P822686 or
Walker 5090-1). Aftermarket filters may not seal
properly or filter efficiently.
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 Restriction Gauge Location
(Model MC shown)
Inspect the paper element after every 100 hours of
service and replace the element and safety filter yearly
(or when dirty or damaged). More frequent replace-
ment may be required when operating in extremely
dusty conditions as indicated by the air restriction
gauge. Service the air cleaner as follows:
1. Release the top and bottom cover latches and re-
move the air cleaner cover. Wash the cover and
Vacuator™ valve. Check that these components
are in good condition. The Vacuator™ valve is
subject to wear and deterioration and should be re-
placed yearly or when damaged. The lips of the
valve should close and fit together; any cracks, de-
formation, or wear in the valve is cause for replace-
ment.
2. Remove the 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 out-
let 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. Replace the filter element.
NOTE: Washing the element in water or cleaning
solution is not recommended. Do not try to clean
the element with compressed air.
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 nec-
essary.
5. Without removing, visually inspect the condition of
the safety filter for damage or holes. The safety fil-
ter should only be removed for yearly replacement
(or when dirty or damaged).
6. 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 dam-
age to the sealing surface are noted.
Cover
Canister
Vacuator™
Valve
Radialseal™
Filter Element
Cover
Latches
Air Restriction
Gauge
Push Button to Reset
Indicator After Service
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