Allied Hy-Ram HR270, Safety, Operation And Maintenance Instructions, Page: 17 / 60

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4.0 Product Information
4.1 Description and Use
The Allied Breaker is a hydraulic powered impact
breaker designed for mounting on mobile equipment
with hydraulic booms, such as rubber tired or track-
type construction vehicles.
The breaker is suited for many types of construction
and mining applications including -

Clearance Work: Demolition of buildings, bridges,
reinforced foundations etc.

Trenching: Breaking trenches out of rocky and
frozen ground.

Mining and Quarrying Applications: Demolishing
and leveling quarry rock, breaking oversized
minerals and other rock-like raw materials.
Excavation of rock from trenches, foundations
and tunneling.

Underwater: Demolition and deepening of
shipping channels. (Requires special modification
for underwater use!)

Recycling: Breakup of "skulls" from the steel
industry.
4.2 Familiarization of Main Components
Fig 4-1 Main Components of Hydraulic Breaker
4.3 Principle of Operation
Fig 4-2 Cutaway View of Breaker Assembly

The Breaker is not self-powered. Performance
relies on a capable host machine that's equipped
with a hydraulic circuit. Within the hydraulic
circuit, an ON/OFF valve is used to control flow in
one direction to the Breaker. The valve will be
managed with a momentary switch located inside
the operator’s cab within easy reach of the
operator.

With the valve ON, supply oil from the host
machine flows to the [IN] port on the breaker. Oil
is blocked from entering the breaker unless
sufficient contact pressure is applied on the tool
to push the piston up and out of the brake
position.

Located on the breaker is the operating valve. Oil
is directed by this valve to the lower end of the
cylinder. The first half of the cycle begins when
oil, under pressure, raises the piston. As the
piston strokes upwards, oil in the upper cylinder
is expelled through the [OUT] port and returned
back to the machine.

A gas-charged accumulator is equipped on larger
breakers. Inside this self-contained pressure
vessel is a pair of expansible chambers divided
by an elastic membrane. The top chamber is pre-
charged with nitrogen gas (N2). The bottom
chamber will receive, store and discharge
pressurized oil.

The chamber inside the Back Head is also filled
with nitrogen gas (N2). The pre-charged gas is
compressed to a higher pressure as the piston is
pushed into the back head.