JLG 110HX Service Manual - Manual (Page 61)

SECTION 2 - PROCEDURES
3120864 – JLG Lift – 2-37
6. Drive Relief.
a. Disconnect and cap hose to drive motor and
plug port on drive section of proportional valve.
Monitor pressure gauge.
b. Have an assistant activate drive forward.
c. Remove torque plug at drive forward relief and
adjust pressure to 241 bar. Add shims to
increase pressure, remove shims to decrease
pressure. Install torque plug.
d. Have assistant deactivate drive forward and acti-
vate drive reverse.
e. Remove torque plug at drive reverse relief and
adjust pressure to 241 bar. Add shims to
increase pressure, remove shims to decrease
pressure. Install torque plug.
f. Have assistant deactivate drive reverse.
g. Remove plugs from drive ports on proportional
valve and reconnect drive motor hoses to valve.
7. Main Relief.
a. Disconnect and cap hoses to drive motor; plug
ports on drive section of proportional valve.
Monitor pressure gauge.
b. On accessory valve, loosen nut on main relief
cartridge and back out adjustment two (2) turns
(CCW).
c. Have an assistant activate drive function.
d. Slowly turn adjustment in (CW) and watch pres-
sure gauge. Continue turning until gauge stops
moving (approximately 241 bar).
e. Turn adjustment in an additional 1/2 turn. This
will result in a relief setting approximately 200 psi
(14 bar) higher than the drive relief setting.
Solenoid Valve
NOTE: Make all solenoid valve adjustments with engine at
low rpm and pressure gauge attached to quick-con-
nect on solenoid valve.
1. Main Relief.
a. Activate platform level up function, bottom out
function and monitor pressure gauge.
b. Remove plug from main relief section and turn
adjusting screw to adjust main relief pressure to
172 bar. Turn adjusting screw CW to increase
pressure, CCW to decrease pressure. Replace
plug.
c. Release platform level up function.
2. Steer Relief.
a. Activate steer right function, bottom out function
and monitor pressure gauge.
b. Loosen locknut on steer right cartridge and turn
adjusting screw to adjust steer right relief pres-
sure to 138 bar. Turn adjusting screw CW to
increase pressure, CCW to decrease pressure.
Tighten locknut.
c. Release steer right function, activate steer left
function, bottom out function and monitor pres-
sure gauge.
d. Loosen locknut on steer left cartridge and turn
adjusting screw to adjust steer left relief pres-
sure to 138 bar. Turn adjusting screw CW to
increase pressure, CCW to decrease pressure.
Tighten locknut.
e. Release steer left function.
3. Platform Rotate Relief.
a. Activate platform rotate right function, bottom
out function and monitor pressure gauge.
b. Loosen locknut on platform rotate right cartridge
and turn adjusting screw to adjust platform
rotate right relief pressure to 172 bar. Tighten
locknut.
c. Release platform rotate right function, activate
platform rotate left function, bottom out function
and monitor pressure gauge.
d. Loosen locknut on platform rotate left cartridge
and turn adjusting screw to adjust platform
rotate left relief pressure to 172 bar. Tighten lock-
nut.
e. Release platform rotate left function.
Extend-A-Reach Valve (If Equipped)
NOTE: Make extend-a-reach valve adjustment with engine
at low rpm and pressure gauge attached to quick-
connect on solenoid valve.
a. Activate extend-a-reach up function, bottom out
function and monitor pressure gauge.
b. Loosen locknut on extend-a-reach up cartridge
and turn adjusting screw to adjust extend-a-
reach up relief pressure to 172 bar. Tighten lock-
nut.
c. Release extend-a-reach up function, activate
extend-a-reach down function, bottom out func-
tion and monitor pressure gauge.
d. Loosen locknut on extend-a-reach down car-
tridge and turn adjusting screw to adjust extend-
a-reach down relief pressure to 48 bar. Tighten
locknut.
e. Release extend-a-reach down function and
remove pressure gauge from solenoid valve.