Decal says: SERVICE EVERY 30 HOURS MORE FREQUENTLY UNDER SEVERE DUST CONDITIONS REMOVE OIL CUP AND SCREEN TRY, EMPTY OIL AND SCRAPE OUT DIRT. INSPECT TRAY SCREENS AND CLEAN IF NECESSARY, REFILL CUP TO OIL LEVEL MARK WITH PROPER VISCOSITY OIL FOR PREVAILING TEMPERATURES. BELOW 32 SAE 10W 32 - 90 SAE 20 ABOVE 90 SAE 30 REPLACE TRAY AND OIL CUP SEE OPERATORS MANUAL DONALDSON COMPANY ST PAUL, MINN.
