JLG 20VP (3120848) Operator Manual - Manual (Page 25)

SECTION 3 - USER RESPONSIBILITIES & MACHINE CONTROLS
3120848 – JLG Lift – 3-5
and DISENGAGED (machine can be moved manually
when the handle is pulled down in a horizontal position).
When brakes are disengaged the machine can then be
moved around manually.
WHEN PUSHED OR PULLED MANUALLY, THE MACHINE‘S
BRAKES MUST BE DISENGAGED AND THE EMERGENCY STOP
BUTTON SET TO THE OFF POSITION, (DEPRESSED). DO NOT
ATTEMPT TO TOW OR WINCH THE MACHINE AT A SPEED
GREATER THAN 3.2 KPH (2 MPH), OR DAMAGE COULD OCCUR
TO THE MACHINE‘S ELECTRONIC CONTROLLER BOX. (DUE TO
HIGH VOLTAGE BEING GENERATED BY THE DRIVE MOTORS
FEEDING BACK INTO THE CONTROLLER BOX).
AFTER THE MACHINE HAS BEEN MANUALLY MOVED AND
BEFORE DRIVING MACHINE, ALWAYS RE-ENGAGE THE BRAKE
SYSTEM.
3.5 JLG POT-HOLE PROTECTION DEVICE
(See Figure 3-5.)
All VP Series lifts are equipped with JLGs Pot-Hole-Protec-
tion system (PHP). The PHP system consists of hinged
PHP bars extending from the bottom edge of both sides of
the base frame, as well as actuating cables and limit
switch assemblies, the PHP bars are actuated by an
assembly mounted at the base of the mast. The PHP bars
are automatically ENGAGED (lowered) when the platform
is raised more than (approximately) 15.25 cm (six (6")
inches). The bars have a ground clearance of approxi-
mately 1.9 cm (three quarters (3/4") inch when ENGAGED
(lowered), and are designed to support the weight of the
machine should one of its wheels drop into a hole or
crack. As the machine drops onto the PHP bar, the bar will
limit the amount of tilt the machine will incur and reduce
the likelihood of the machine tipping over. If this condition
should occur, the operator must then fully lower the plat-
form, exit the platform, and safely remove the machine
from the situation.
When the machine is driven in areas where obstacles are
higher than 1.9 cm (three quarters (3/4") inch) off the work
surface (door sills, thick carpeting, etc.) the platform must
be completely lowered to allow the PHP bars to DISEN-
GAGE (retract), allowing sufficient clearance of the
machine’s base frame.
Figure 3-4. Brake Release Handle.
Figure 3-5. JLGs Pot-Hole-Protection Device -
PHP Bar Operation.