JLG 1850SJ Operation And Safety Manual page 166

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