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7.0 Care and Maintenance – [cont’d]
7.4.2 Check Tool & Bushing Gap – Every 50 Hours
Inspect the condition of the tool and bushing. Check
the gap and replace worn parts when their wear limit
is reached.
Measure the gap between the lower bushing and tool.
If maximum gap, shown in Table 7.3, is reached,
follow the instructions in Section 7.4.3.
Fig 7-4 Gap (D4) Between Tool and Bushing
7.4.3 Front Head – Inspection of Internal Parts
Internal components of the front head are viewable
only when the breaker tool is removed.
Wipe grease from parts to be inspected. Check parts
for wear and damage. Review Table 7.2 for cause
and remedy.
7.4.4 Measure Tool and Bushing Wear
The tool is guided by the bushings and is kept square
to the piston. It's critical for the protection of the
piston and seal system to keep bushings in good
condition. Replace parts that have reached their wear
limit.
Fig 7-5 Measure Tool Diameter for Wear
Fig 7-6 Measure Bushing & Tool for Wear
Table 7.3 Wear Limits – Inch [mm]
Model
HR270
HR290
D1
Tool O.D.
New
2.67"
[68]
2.93"
[74.5]
D2
Tool O.D.
Limit
2.59"
[66]
2.85"
[72.5]
D3
Bushing
I.D.
Limit
2.75”
[70]
3.01”
[76.5]
D4
Gap
3/16”
[4.5]
3/16”
[4.5]
IMPORTANT
Wear cannot be prevented, but it can be minimized
through proper operating techniques and timely re-
lubrication. Re-lubricate every two hours or sooner if
grease is not visible. Allied Chisel paste is
recommended.
7.4.5 Tool Retainer Inspection
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.
7.5 Piston Inspection
The piston can be viewed after the tool is removed.
The impact surface should be flat and smooth.
Summary of Contents for Hy-Ram HR270
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