JLG 1850SJ Operator Manual - Manual (Page 146)

SECTION 7 - GENERAL SPECIFICATIONS & OPERATOR MAINTENANCE
7-14 – JLG Lift – 3121618
4. Hydraulic Return Filter
Lube Point(s) - Replaceable Element
Interval - Change after first 50 hours and every 6 months or
300 hours thereafter.
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 fre-
quent basis.