JLG 1850SJ Operator Manual - Manual (Page 147)

SECTION 7 - GENERAL SPECIFICATIONS & OPERATOR MAINTENANCE
3121618 – JLG Lift – 7-15
6. Hydraulic Charge Filter
Lube Point(s) - Replaceable Element
Interval - Change after first 50 hours and every 6 months or
300 hours thereafter.
7. High Pressure Filter
Lube Point(s) - Replaceable Element
Interval - Change after first 50 hours and every 6 months or
300 hours thereafter.