JLG 20VP (3120848) Operator Manual - Manual (Page 22)

SECTION 3 - USER RESPONSIBILITIES & MACHINE CONTROLS
3-2 – JLG Lift – 3120848
3.3 OPERATING CHARACTERISTICS AND
LIMITATIONS
General
A thorough knowledge of the operating characteristics
and limitations of the machine is always the first require-
ment for any user, regardless of user’s experience with
similar types of equipment.
Placards
(See Figures 3-6, 3-7, 3-8 & 3-9.)
Important points to remember during operation are pro-
vided at the control stations by DANGER, WARNING,
CAUTION, IMPORTANT and INSTRUCTION placards. This
information is placed at various locations on the machine
for the express purpose of alerting personnel of potential
hazards constituted by the operating characteristics and
load limitations of the machine. See the Foreword at the
start of this manual for a definition of the seriousness of
each of the above placard types. See decal location fig-
ures in this section for decals which apply to this machine.
Capacities
Raising the platform above the stowed position is based
on the following criteria:
• The machine is positioned on a smooth, firm level sur-
face.
• The load is within manufacturer’s rated capacity.
• All machine systems are functioning properly.
Stability
This machine, as originally manufactured by JLG, and
when operated within its rated capacity on a smooth, firm
and level supporting surface, (check bubble level indica-
tor on base frame), provides a stable aerial platform for all
platform positions.
3.4 CONTROLS AND INDICATORS
Ground Controls
(See Figure 3-1.)
NOTE: When the machine is not being used or when charg-
ing the battery, be sure the POWER PLAT/OFF/
GRND KEY SWITCH is positioned to OFF to prevent
draining the batteries. For information on battery
charging see SECTION 2-7, Battery Charging.
1. POWER PLAT/OFF/GROUND KEY SWITCH
A key operated power PLAT/OFF/GROUND switch
located in the upper access hole of the rear cover
(on back of machine), controls power to all functions
on the machine. The machine platform controls will
not operate without the key inserted and turned to
the PLAT (platform) position. When the key switch is
set to the GRND (ground) position this allows use of
the platform UP/DOWN switch located next to the
hydraulic oil reservoir (lower access hole). When left
unattended, removing the key will prevent unautho-
rized machine use.
2. PLATFORM UP/DOWN (GROUND CONTROL)
The ground operated platform control switch is
located next to the hydraulic reservoir in the lower
access hole of the rear cover. This three position
toggle switch will raise (lift up) and lower (lift down),
the platform from the ground control position when
the PLAT/OFF/GRND key switch is set to the GRND
(ground) position.
3. EMERGENCY STOP BUTTON
An EMERGENCY STOP (red button) is mounted on
both the ground control station and the platform
controller. When either button is depressed, all
machine functions will stop. To re-activate power to
the machine, turn button to RESET the emergency
stop button.
4. EMERGENCY/MANUAL DESCENT KNOB
This (RED knurled) knob, located on the electric/
hydraulic pump-motor unit in the lower access hole
of the rear cover provides for lowering of the plat-
form in the event of an emergency or power failure.
Turn knob (counterclockwise) to open the valve and
lower the platform. This valve must be closed
(turned all the way clockwise) for normal operation
of the machine. (Refer to Section 6 for Emergency
Descent operating procedures.)
5. HYDRAULIC OIL RESERVOIR
The hydraulic oil reservoir is housed inside the lower
access hole in the rear cover. Check the hydraulic oil
level visually by observing the oil level in the reser-