JLG 400SC Operation And Safety Manual page 132

SECTION 7 - GENERAL SPECIFICATIONS & OPERATOR MAINTENANCE
2. Hydraulic Return Filter
Interval - Change after first 50 hours and every 6 months or
300 hours thereafter or whenever Charge Filter is replaced
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3. Hydraulic Tank Breather
Interval - Change after first 50 hours and every 6 months or
300 hours thereafter.
Comments - Remove wing nut and cover to replace. Under cer-
tain conditions, it may be necessary to replace on a more
frequent basis.
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