JLG E300 Service Manual - Manual (Page 158)

SECTION 5 - HYDRAULICS
5-16 – JLG Lift – 3121253
Adjustments made at the Boom Function
Valve Bank
JIB LIFT UP – 2000 PSI (138 BAR)
1. Install pressure gauge at port MP of Main Valve
Bank.
2. Activate Jib Lift Up and hold to end of stroke. Take
pressure reading.
3. After loosening relief valve jam nut, adjust valve
clockwise to increase pressure or counterclockwise
to reduce pressure accordingly.
4. Tighten relief valve jam nut and repeat step 2 to ver-
ify setting.
JIB LIFT DOWN – 1200 PSI (83 BAR)
1. Install pressure gauge at port MP of Main Valve
Bank.
2. Activate Jib Lift Down and hold to end of stroke.
Take pressure reading.
3. After loosening relief valve jam nut, adjust valve
clockwise to increase pressure or counterclockwise
to reduce pressure accordingly.
4. Tighten relief valve jam nut and repeat step 2 to ver-
ify setting.
JIB UP
RELIEF VALVE
JIB DOWN
RELIEF VALVE