JLG 20VP (3120727) Operator Manual - Manual (Page 28)

SECTION 3 - USER RESPONSIBILITIES & MACHINE CONTROLS
3-6 – JLG Lift – 3120751
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) six (6") inches. The
bars have a ground clearance of approximately 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 platform, exit the plat-
form, and safely remove the machine from the situation.
When the machine is driven in areas where obstacles are
higher than three quarters (3/4") inch off the work surface
(door sills, thick carpeting, etc.) the platform must be com-
pletely lowered to allow the PHP bars to DISENGAGE
(retract), allowing sufficient clearance of the machine’s
base frame.
Figure 3-5. JLGs Pot-Hole-Protection Device -
PHP Bar Operation.