JLG E300 Service Manual - Manual (Page 117)

SECTION 5 - HYDRAULICS
3120772 – JLG Lift – 5-21
5.7 PRESSURE SETTINGS
Cold temperatures have a significant impact on pressure
readings.JLG Industries Inc. recommends operating the
machine until hydraulic system has warmed to normal
operating temperatures prior to checking pressures. We
also recommend using a calibrated gauge. Pressure read-
ings are acceptable if within +/- 5% of specified pres-
sures.
Main Relief at Pump
1. Install pressure gauge at port “G” on Steer/Brake
valve.
2. Activate and bottom out either Upper or Lower Lift
Up. Adjust Main Relief, (A/AJ) and (AJP), to value in
the pressure settings table.
Upper Lift Down Relief
1. With pressure gauge at “G” port on Main Control
valve, activate and bottom out Upper Lift Down.
2. Adjust Upper Lift Relief to value in the pressure set-
tings table.
Lower Lift Down Relief
1. With pressure gauge at “G” port on Main Control
valve, activate and bottom out Mid/Lower Lift Down.
2. Adjust Lower Lift Relief to value in the pressure set-
tings table.
Swing Relief
1. With pressure gauge at “G” port on Main Control
valve, activate and bottom out Swing function in
either direction.
2. Adjust Swing Relief to value in the pressure settings
table.
Telescope In Relief
1. With pressure gauge at “G” port on Main Control
valve, activate and bottom out Telescope In.
2. Adjust the Telescope In Relief (A/AJ), to value in the
pressure settings table.
Platform Level Up Relief
1. On machines prior to S/N 0300063313, install the
pressure gauge at the “G” port on Main Control
valve, activate and bottom out Platform Level Up.
On machines S/N 0300063313 to present, install the
pressure gauge at the "B2" port on the back of the
Main Control Valve, activate and bottom out Platform
Level Up.
2. Adjust Platform Level Up Relief to value in the pres-
sure settings table.
LC LR
TR
T2
B2
B1
S2
S1
R2 R1
TC
LU LL
P R
L
T1
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