JLG 120HX ANSI Service Manual User Manual
Page 47
SECTION 2 - PROCEDURES
3120686
– JLG Lift –
2-27
b. Bottom out Extend-A-Reach Up function.
c. Loosen nut at extend-a-reach up relief and
adjust pressure to 3000 psi (207 bar) using an
Allen wrench. Tighten nut.
d. Bottom out Extend-A-Reach Down function.
e. Loosen nut at extend-a-reach down relief and
adjust pressure to 1400 psi (97 bar) using an
Allen wrench. Tighten nut.
5.
Platform Rotate Relief.
a. Monitor pressure gauge at quick-connect on
main valve.
b. Bottom out Rotate Right function.
c. Loosen nut on rotate right relief and adjust pres-
sure to 2500 psi (172 bar). Tighten nut.
d. Bottom out Rotate Left function.
e. Loosen nut on rotate left relief and adjust pres-
sure to 2500 psi (172 bar). Tighten nut.
6.
Platform Level Relief.
a. Monitor pressure gauge at quick-connect on
main valve.
b. Bottom out Platform Level Up function.
c. Loosen nut on platform level up relief and adjust
to Tighten nut.
d. Bottom out Platform Level Down function 2500
psi (172 bar). Tighten nut.
e. Loosen nut on platform level down relief and
adjust to 2000 psi (138 bar).
Frame Valve
1.
Steer Relief.
NOTE: Torque frame valve bolts to 80 in. lb. (9 Nm) after
checking or adjusting steer pressure.
a. Plug pressure gauge into quick-connection on
frame valve. Monitor gauge.
b. Bottom out Front Steer Right function.
c. Loosen nut on front steer right relief and adjust
to 2000 psi (138 bar). Tighten nut.
d. Bottom out Front Steer Left function.
e. Loosen nut on front steer left relief and adjust to
2000 psi (138 bar). Tighten nut.
f. Bottom out Rear Steer Right function.
g. Loosen nut on rear steer right relief and adjust to
2000 psi (138 bar). Tighten nut.
h. Bottom out Rear Steer Left function.
i.
Loosen nut on rear steer left relief and adjust to
2000 psi (138 bar). Tighten nut.
2.
Axle Extension/Retraction Relief.
a. Monitor pressure gauge at quick-connect on
frame valve.
b. Raise front end of machine using front frame
jack.
c. Bottom out Front Axle Extend function.
d. Loosen nut on front axle extend relief and adjust
pressure to 2000 psi (138 bar). Tighten nut.
e. Bottom out Front Axle Retract function.
f. Loosen nut on front axle retract relief and adjust
pressure to 2200 psi (152 bar). Tighten nut.
g. Lower front end of machine.
h. Raise rear end of machine using rear frame jack.
i.
Bottom out Rear Axle Extend function.
j.
Loosen nut on rear axle extend relief and adjust
pressure to 2000 psi (138 bar). Tighten nut.