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Replace fresh air filters.
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Replace cab air recirculation filter.
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Replace air drier cartridge.
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Check service brake components.
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Change the engine oil.
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Clean engine vent tube.
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Replace primary and secondary engine air filters.
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Replace engine oil filter.
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Test coolant. See your John Deere dealer.
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Check front axle toe-in.
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Check the hydrostatic drive pump isolators.
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Check seat belts.
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Clean sprayer and coat exposed surfaces.