Allied 300, Technical Manual, Page: 16 / 66

Allied Construction Products, LLC Technical Manual Ho-Pac 300, 300B & 500, 500B
5
SECTION 4.0
OVERVIEW
4.1 Product Description and
Application
The Allied Ho-Pac is a boom-mounted,
hydraulic powered, vibrating plate
compactor and driver. It is used for soil
compaction and sheet/pile installation. The
Ho-Pac is designed for mounting on mobile
equipment with hydraulic booms, such as
rubber tired or track-type construction
vehicles and is attached to the carrier in the
same manner as mounting a bucket. The
Ho-Pac utilizes the hydraulic power system
of the host machine to supply power to the
dynamic assembly and generate vibrations.
Applications include backfill compaction,
base course preparation, finish surface
treatment and embankment buildup. It is
also used for sheet/pile installation.
4.2 Major Subassemblies
Fig. 4-1
Major Subassemblies
1-Dynamic Assembly, 2-Suspension System, 3-
Mounting Frame, 4-Control Valve
The Allied Ho-Pac consists of the following
major subassemblies:
Dynamic Assembly - Generates and
transfers the vibratory energy to the soil.
The assembly includes the hydraulic motor,
eccentric mass, bearings, housing and
compaction plate.
Suspension System
– Rubber Spring
Mounts suspend and isolate the Mounting
Frame from the Dynamic Assembly.
Mounting Frame
– Connected to the
Suspension System, the Mounting Frame
provides hook up points for attaching the
Ho-Pac to the stick / linkage of the carrier.
Control Valve
– A standard feature on all
models is the hydraulic control valve. This
multi-function valve is designed to optimize
operation and provide reliability of critical
components, such as the hydraulic motor
and bearings.
NOTE : The valve is factory
pre-set and requires no further adjustments.
The valve offers the following protection:
Flow regulator - Prevents over-speeding
the hydraulic motor by limiting the flow.
Pressure control - Prevents over-
pressuring the motor and other hydraulic
components. This is factory pre-set at the
maximum operating pressure plus 200 psi
(14 bar).
Anti-cavitation circuit - Controls
deceleration of the hydraulic motor and
eccentric mass. Also protects motor from
damage on circuits not set up with an open
return.
Return line check valve - Prevents reverse
flow to the hydraulic motor. Also provides a
nominal back-pressure to ensure the proper
operation of auxiliary valves, such as
Allied’s AC40 and AC75 priority flow control
valves.