JLG 20VP (3120727) Operator Manual - Manual (Page 18)

SECTION 2 - PREPARATION AND INSPECTION
2-4 – JLG Lift – 3120727
SEE SECTION-3 FOR SPECIFIC INFORMATION ABOUT OPERAT-
ING MACHINE CONTROLS AND SECTION-4 FOR OPERATION OF
MACHINE.
Ground Controls Function Check
1. With key switch turned to GRND position (clock-
wise), operate the platform up and down switch
(located in lower access hole with hydraulic fluid res-
ervoir). Raise and lower platform 2 ft. to 3 ft. (.5m to
1m) several times. Check for smooth elevation and
lowering of platform.
2. With platform completely lowered, check hydraulic
oil level in hydraulic fluid reservoir. If necessary, add
hydraulic fluid to proper level (full line). NEVER USE
HYDRAULIC BRAKE FLUID, refer to the Lubrication
Chart (Table 2-1.) for specific requirements.
3. Depress EMERGENCY STOP (red) button (next to
key switch), all machine operations will be disabled
if functioning properly. If ok, reset EMERGENCY
STOP for operation.
4. Operate the MANUAL BRAKE RELEASE CONTROL
(Over-center handle mounted on the right side of the
mast). When the handle is in the vertical position it is
set for normal operation, brakes ENGAGED. When
the handle is pulled DOWN to a horizontal position,
the brakes are DISENGAGED.
5. Set key switch to PLAT (platform operation, all the
way counterclockwise) and continue with the follow-
ing steps.
Platform Controls
NOTE: Check that the MANUAL BRAKE RELEASE CON-
TROL (Over-center handle mounted on side of
mast), is set for normal operation (brakes engaged)
before entering platform.
1. Check that the PLATFORM CONTROL box is prop-
erly mounted (facing forward) and secure on the
platform’s rail.
2. On the PLATFORM CONTROL box, check the BAT-
TERY STATUS INDICATOR LED’s for charge status
of batteries.
3. Check for proper operation of the FUNCTION
ENABLE pad, and that the JOYSTICK CONTROL
moves freely.
4. Activate the JOYSTICK and slowly move it in all
directions, if operating properly the machine will
move in the direction the JOYSTICK is pointed.
5. While driving the machine forward rotate the SPEED
CONTROL knob from maximum to minimum (clock-
wise to counterclockwise) checking for proper oper-
ation. If operating properly, speed should vary from
2 mph to 1/2 mph.
NOTE: A short delay between lift motor start and platform
movement is normal.
6. Activate the platform UP and DOWN buttons (up
arrow and down arrow) to raise and lower platform 2
ft. to 3 ft. (.5m to 1m) several times. Check for
smooth elevation and lowering of platform.
7. With the platform elevated check the JLG Automatic
Pot-Hole-Protection system, if operating properly,
the PHP bars on each side of the machine base will
be automatically engaged (lowered) with the plat-
form raised approximately 2 ft.
8. With the platform still elevated approximately 2 ft.,
drive machine and check if SPEED CUT-BACK is
operating properly, machine should drive at 1/4 of
speed when platform was completely lowered.
9. Depress the EMERGENCY STOP (red) button on the
Platform Control box, all machine operations will be
disabled if functioning properly. RESET the EMER-
GENCY STOP.
Tilt Sensor (1.5°) and Drive Brakes
1. With the platform lowered, drive the machine onto a
grade within the allowable grade and slope limits of
the machine (maximum grade of 15% or 8.5°, maxi-
mum side slope of 5°). Stop the machine part of the
way up the grade, check if the drive brakes hold the
machine in place. Also while on the grade (of greater
than 1.5°), attempt to raise the platform. The tilt sen-
sor (1.5°) must prevent the platform from elevating
and will sound a beeping alarm at the platform con-
troller box.
If all machine functions are operating properly, machine is
ready for operation.
2.6 TORQUE REQUIREMENTS
The Torque Chart, Figure 2-5., consists of standard torque
values based on bolt diameter and grade, it also specifies
dry and wet torque values in accordance with recom-
mended shop practices. This chart is provided as an aid
to the user/operator in the event he/she notices a condi-
tion that requires prompt attention during the walk-around
inspection or during operation until the proper service per-
sonnel can be notified. Utilizing this Torque Chart in con-
junction with the Preventive Maintenance and Inspection
Schedule table in the Service Manual, will enhance the
safety, reliability, and performance of the machine.