JLG 120HX Operator Manual - Manual (Page 28)

SECTION 2 - PREPARATION AND INSPECTION
2-12 – JLG Lift – 3120818
6. Check platform rotator for smooth operation and
assure platform will rotate 90 degrees in both direc-
tions from centerline of boom.Raise, lower, and
swing boom to LEFT and RIGHT a minimum of 45
degrees (Cycle function several times.) Check for
smooth elevation and swing motion.
7. Raise and lower and swing Extend-A-Reach (Cycle
functions several times). check for smooth elevation
and swing motion.
8. Telescope boom in and out several cycles at various
degrees of elevation lengths. Check for smooth tele-
scope operation.
9. Check that platform automatic self-leveling system
functions properly during raising and lowering of the
boom.
10. Check platform level adjustment system for proper
operation.
NOTE: Turntable lock is on turntable facing platform. To dis-
engage lock, pull snap pin from lock pin, lift lock pin
up to unlock turntable. Return snap pin to lock pin to
hold lock pin in the disengaged position. Reverse
procedure to engage turntable lock.
11. Swing turntable to LEFT and RIGHT a minimum of
45 degrees. Check for smooth motion.
12. With the aid of an assistant to monitor the CHASSIS
OUT OF LEVEL indicator light on the platform con-
trol console, manually activate the indicator light by
compressing any one of the three tilt indicator
mounting springs. If the light does not illuminate,
shut down machine and contact a qualified service
technician before continuing operation.
13. Footswitch.
FOOTSWITCH MUST BE ADJUSTED SO THAT FUNCTIONS WILL
OPERATE WHEN PEDAL IS APPROXIMATELY AT ITS CENTER OF
TRAVEL. IF SWITCH OPERATES WITHIN LAST 1/4" OF TRAVEL,
TOP OR BOTTOM, IT SHOULD BE ADJUSTED.
a. Activate hydraulic system by depressing foot-
switch. Operate TELESCOPE and hold control.
Remove foot from footswitch, motion should
stop. If it does not, shut down machine and con-
tact a certified JLG service technician.
b. With footswitch depressed, operate LIFT and
hold control. Remove foot from footswitch,
motion should stop. If it does not, shut down
machine and contact a certified JLG service
technician.
c. With engine power shut down, depress the foot-
switch. Attempt to start engine. Engine should
n o t a t t e m p t t o s t a r t w h e n f o o t s w i t c h i s
depressed. If starter engages or engine turns
over, shut down machine and contact a certified
JLG service technician.
14. Auxiliary Power.
Operate each function control switch (e.g. TELE,
LIFT and SWING) to assure that they function in
both directions using auxiliary power instead of
engine power.
15. Ground Controls.
Place GROUND/PLATFORM SELECT switch to
GROUND. Start engine. Platform controls should not
operate.
2.6 TORQUE REQUIREMENTS
The Torque Chart (Figure 2-4.) consists of standard torque
values based on bolt diameter and grade, also specifying
dry and wet torque values in accordance with recom-
mended shop practices. This chart is provided as an aid
to the operator in the event a condition is noticed that
requires prompt attention during the walk-around inspec-
tion or during operation until the proper service personnel
can be notified. The Service and Maintenance manual
provides specific torque values and periodic maintenance
procedures with a listing of individual components. Utiliz-
ing this Torque Chart in conjunction with the preventive
maintenance section in the Service and Maintenance
manual, will enhance safety, reliability and performance of
the machine.