JLG 400S Operation Manual page 121

4. 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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SECTION 6 - GENERAL SPECIFICATIONS & OPERATOR MAINTENANCE
5. Hydraulic Tank Breather
Interval - Change after first 50 hrs. and every 6 months or 300
hrs. thereafter.
Comments - Remove wing nut and cover to replace. Under cer-
tain conditions, it may be necessary to replace on a more
frequent basis.
– JLG Lift – 6-21