Poweramp LHP SERIES HYDRAULIC - Manual (Page 11)

9 4111-0012 — Aug 2012
April 2013
INTRODUCTION
Component Identification
A — Lip
B — Platform
C — Lip Cylinder D — Powerpack (Motor/Pump/Reservoir)
E — Maintenance Prop
F — Platform Cylinder G — Main Frame
H — Lip Keepers (2 used) J — Full RangeToe Guard
(4 used)
K —Raise Button
The LHP dock leveler uses a pressure operated
valve block and single push-button operation for ease
of use.
The dock leveler can be operated remotely using the
RAISE button (K) on the control panel .
Platform (B) is raised by pushing and holding the
RAISE button (K). This activates an electric motor (D)
which, in turn, drives a hydraulic pump. The hydraulic
pump forces oil into the platform cylinder (F), causing
the platform to rise. Releasing the RAISE button
allows the platform to lower.
When the platform rises and the hoist cylinder is fully
extended, the internal valving redirects the flow of
oil to the lip cylinder (C). This causes the platform
to stop rising and lip (A) to extend. When the lip has
fully extended, the hydraulic oil will flow past the
pressure relief valve and back to the oil reservoir.
Releasing the raise button will allow the platform to
float down to the below dock position. The lip will stay
extended until the platform reaches the full below
dock position.
Pressing the raise button will return the platform and
lip to the stored position.
THEORY
A
D
B
C
F
E
G
J
H
K