Maintenance, inspection and repair
3 – 2
Standard of judgment
Description Method
Pin and bush
(1) No pin and bush must be worn.
(2) All pins and bushes must be
greased fully.
Visual
Oil hose
(1) No oil leakage.
(2) Metal fixtures have no looseness.
Visual
Check the oil hoses.
Pipe (1) No mounting bolt must not fall off,
nor be loosened.
Check the pipes.
Control valve
(1) No oil leakage.
(2) Valve must be opened and closed
normally.
Visual
Check the valves.
Pipes
Relief valve 3)
(1) No oil leakage.
(2) Valve must work normally under
the specified relief pressure, and
the pointer of pressure gauge
must not move.
Visual
Measure the
pressure.
Line filter 3)
(1) No oil leakage/No damage.
(2) No element must be clogged.
Visual
Check the
elements.
Operation pedal
(1) Operative power and play amount
must be proper.
Check the power
and amount.
Stop valve
(1) No oil leakage.
(2) Valve must be opened and closed
normally.
Visual
Check the valves.
Total
Function
(1) The operative pressure and
number of blows must be within
the specified valued and parts
must work normally.
Measure the values.
Notes: 1) Refer to P3-8 for the wear limit of each part.
2) Refer to P3-8, 3-9 for the rod use limit (effective length).
3) In some types of hydraulic excavators, a relief valve and line filter (exclusively for
breaker) are not set in the piping circuit of a hydraulic breaker. In such a case, omit
these checks.
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n Disassembly and reassembly of breaker body
The breaker body, which is manufactured with high processing technique, is composed of high-quality
hydraulic parts. Never diassemble the breaker on a work spot. Please ask the distributor to
disassemble. A technical service engineer will disassemble, reassemble and then adjust the machine.
If you diassemble it, we cannot guarantee its functions.
Parts Check points
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