Allied AR110C, Safety, Operation And Maintenance, Page: 30 / 60

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7.0 Care and Maintenance – [cont’d]
The tapered shoulder of the tool seats against the
matching taper of the thrust ring. It's the operator's
technique that has the greatest bearing on the wear
rate of the thrust ring. Weak down force, repeated
blank firing and extensive raking must be avoided if it
is to deliver long-term service.
Fig. 7-7. Measure the thrust ring for wear in the
tapered surface. Replace thrust ring when "D"
Maximum is reached in the Table 7.3. Regardless of
measurement, always replace the thrust ring if
chipped or cracked.
7.4.5 Tool Retainer Inspection
Fig 7-8 Rotate Worn Tool Retainer
Inspect tool retainers each time the breaker tool is
removed. The retainer should be rotated when the
surface becomes uneven or damaged from galling.
Replace when both sides are worn.
7.4.6 Piston Inspection – With Tool Removed
Remove the tool to view the lower end of the piston.
The impact surface should be flat, smooth and free
from any damage.
Fig 7-9 Piston Shown With Damage to Impact Face
Discontinue all further use of the breaker if impact
face is cupped, chipped, cracked or has sharp edges.
These conditions are the result of worn bushings, tool
misalignment, and metal fatigue. Complete
disassembly of the breaker is required to replace
piston. Contact your Allied service center.
7.5 Inspection of the High-Pressure Accumulator
WARNING
Prevent injury from unexpected
release of high pressure gaseous
energy. Gas under pressure remains
in the accumulator even at times
when there is no hydraulic pressure to
the breaker.
Only qualified technicians with special
tools and training should service the
accumulator. Never attempt to
dismantle the accumulator until it is
safely discharged of all pressure.
If the breaker is attached to a carrier do not service
the accumulator until oil pressure inside breaker and
hydraulic circuit is relieved.
The accumulator is a self-contained pressure vessel
with an elastic membrane that divides the inner
housing into a pair of expansible chambers. The
lower chamber is used to receive, store and
discharge pressurized oil. The upper chamber is filled
with nitrogen gas.
Under normal conditions, the accumulator requires a
daily visual inspection for oil leaks and broken or
loose bolts. No further service is necessary between
rebuilds.
Generally, accumulator failures are abrupt from
membrane rupture and the gas pressure immediately
falls to zero. Without the aid of the gas pre-charge,
breaker performance is noticeably diminished.
Symptoms include one or more of the following:

Reduction in blow energy

Decrease in blow frequency

Strong pulsations in hoses

Oil leaking from around the accumulator
CAUTION
In the event of an accumulator failure,
immediately discontinue operation.
Ignoring this notice can damage the
breaker and the carrier.
Do not use the breaker until the membrane is
replaced and pre-charged with nitrogen gas.
Accurate charging to the specified pressure is
important for proper and long-term performance. See
Section 12 for further instructions.