JLG 110HX Service Manual - Manual (Page 60)

SECTION 2 - PROCEDURES
2-36 – JLG Lift – 3120864
2.17 PRESSURE SETTING PROCEDURES
Sequence Pressure (Prior to 1990)
1. Plug pressure gauge into quick-connect on high
drive dump valve. Monitor gauge.
2. On sequence valve, loosen nut at main relief. On
sequence valve 4640535 depress plunger; on
sequence valve 4640580 use an allen wrench to turn
the plunger in. Use plunger to set main relief to 300
psi (21 bar).
3. Loosen nut on sequence cartridge and adjust
sequence pressure to 450 psi (31 bar). Tighten nut.
4. Use plunger to set main relief to 3500 psi (241 bar)
and tighten nut on main relief cartridge.
5. Remove pressure gauge.
Sequence Pressure (1990 to Present)
1. Plug pressure gauge into quick-connect on high
drive dump valve. Monitor gauge.
2. Run an electrical current to activate the dump valve.
3. Loosen the lock nut on sequence cartridge and
adjust sequence pressure to 450 psi (31 bar). Turn
the adjusting screw clockwise to increase pressure
or counterclockwise to decrease pressure.
4. Tighten the lock nut and remove the electrical cur-
rent from the dump valve.
5. Remove pressure gauge.
Pilot Pressure
1. Plug pressure gauge into quick-connect on acces-
sory valve at PO port. Monitor gauge.
2. Activate lift down function and bottom out function.
3. Loosen nut on pressure reducing cartridge and
adjust cartridge to 38 bar. Tighten nut.
4. Release lift down function.
5. Remove pressure gauge.
Proportional Valve
NOTE: Make all proportional valve adjustments with engine
at low rpm and pressure gauge attached to quick-
connect on high drive dump valve.
1. Swing Relief.
a. Plug pressure gauge into quick-connect on high
drive dump valve.
b. Lock turntable, activate swing right function, bot-
tom out function and monitor pressure gauge.
c. Remove torque plug at swing right relief and
adjust pressure to 83 bar. Add shims to increase
pressure, remove shims to decrease pressure.
Install torque plug.
d. Release swing right function, activate swing left
function, bottom out function and monitor pres-
sure gauge.
e. Remove torque plug at swing left relief and
adjust pressure to 83 bar. Add shims to increase
pressure, remove shims to decrease pressure.
Install torque plug.
f. Release swing left function and unlock turntable.
2. Lift Down Relief.
a. Activate lift down function, bottom out function
and monitor pressure gauge.
b. Remove torque plug at lift down relief and adjust
pressure to 83 bar. Add shims to increase pres-
sure, remove shims to decrease pressure. Install
torque plug.
c. Release lift down function.
3. Lift Up Relief.
a. Activate lift up function, bottom out function and
monitor pressure gauge.
b. Remove torque plug at lift up relief and adjust
pressure to 207 bar. Add shims to increase pres-
sure, remove shims to decrease pressure. Install
torque plug.
c. Release lift up function.
4. Telescope In Relief.
a. Activate telescope in function, bottom out func-
tion and monitor pressure gauge.
b. Remove torque plug at telescope in relief and
adjust pressure to 172 bar. Add shims to
increase pressure, remove shims to decrease
pressure. Install torque plug.
c. Release telescope in function.
5. Telescope Out Relief.
a. Activate telescope out function, bottom out func-
tion and monitor pressure gauge.
b. Remove torque plug at telescope out relief and
adjust pressure to 103 bar. Add shims to
increase pressure, remove shims to decrease
pressure. Install torque plug.
c. Release telescope out function.
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