JLG E300 Service Manual - Manual (Page 160)

SECTION 5 - HYDRAULICS
5-18 – JLG Lift – 3121253
• at end of platform level up hose (do not use this loca-
tion if port 15 was chosen in step 2.)
4. Activate Platform Level Up and hold. Take pressure
reading.
5. After loosening relief valve jam nut, adjust valve
clockwise to increase pressure or counterclockwise
to reduce pressure accordingly.
6. Tighten relief valve jam nut. Repeat step 4 and verify
the pressure setting.
7. Reconnect the platform level up hose that was dis-
connected in Step 2.
USE CAUTION WHEN DISCONNECTING / RECONNECTING HOSES
ON THE PLATFORM LEVEL CIRCUIT AS THIS CIRCUIT MAINTAINS
PRESSURE
8. Refer to the Main Pressure Relief Valve procedure
and return Main Pressure Relief Valve to 3000 psi
(207 Bar).
PLATFORM LEVEL DOWN – 1200 PSI (83 BAR)
There are two different methods that can be used to set
the Platform Level Down pressure, Option 1 and Option 2.
They are outlined as follows.
Option 1:
1. Install pressure gauge at port “M16” of Boom Func-
tion Valve Bank.
2. Activate Upper Lift Up and hold to end of stroke.
3. Activate Platform Level Down to end of stroke. Take
pressure reading.
PLATFORM LEVEL
UP HOSE
PLATFORM
LEVEL DOWN
RELIEF VALVE