Allied AR110C, Safety, Operation And Maintenance, Page: 28 / 60

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7.0 Care and Maintenance – [cont’d]

Ensure that the tool is properly engaged in the
front head by the retainers.

Check that both the tool and bushings are
receiving sufficient lubrication.

Be alert to any oil seepage on the ground, tool or
the front head, as this may indicate a serious
condition that will require further investigation

Visually inspect the gap between the lower
bushing and tool. Further details in Section 7.4.1.
7.4.1 Measure Gap Between Tool and Bushing –
Every 50 Hours or Weekly
Visually inspect the gap between the lower bushing
and tool. If maximum gap, shown in Table 7.2, is
reached, follow further details in Section 7.4.2.
Fig 7-3 Gap Between Tool and Bushing – Wear is
Measured At D1
7.4.2 Internal Parts of Front Head Assembly
The tool is inserted into the open end of the front
head and secured by the retainer system. The
condition of the tool, bushings and thrust ring must be
actively monitored. The bushings play a critical role in
holding and guiding the tool so at the moment of
impact the piston and tool are squarely aligned with
each other. The thrust ring positions the height of the
tool to match the stroke of the piston. Design of the
thrust ring varies by model. Some are machined as
part of the upper bushing while other models have a
thrust ring that is separate from the bushing.
7.4.3 Front Head Inspection – Every 100 Hours
The internal components of the front head are
viewable only when the breaker tool is removed. The
aim of regularly inspecting the tool, bushings, thrust
ring, retainers and piston is to spot potential problems
in their early stages, before they can worsen into
serious damage and costly repairs.
Wipe grease from parts to be inspected. Check parts
for wear and damage. Review Table 7.2 for cause
and remedy.
Fig 7-4 Internal Parts of Front Head Assembly

Tool - Burs formed in retainer slot
(1)

Retainer - Burs or uneven wear
(1)
, heavy wear
(3)
or chipping
(2)
.

Tool, Bushings or Retainer - Galling
(1,3,4)

Thrust Ring – Cracked, chipped or uneven wear
(1,2,4,5)

Bushing - Cracked
(4)

Piston - Impact face concaved, cracked, chipped
or sharp edges
(4,5)