New Holland WorkMaster 50 Service Manual page 50

Air cleaner - Replace
1. The inner element to be removed only at the time of
replacement. It should never be cleaned. The inner
element should be replaced after three outer element
replacements or 2700 h whichever is earlier.
2. Follow the similar instructions of removing and fitting
outer element from casting to replace inner element.
Engine - Air cleaners and lines
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