PDF Shop Manual Komatsu JMHB170H-1 Hydraulic Breaker - 1 MB
This official shop manual provides comprehensive service and repair information for the Komatsu JMHB170H-1 Hydraulic Breaker.
It covers everything from operational principles to complete disassembly and reassembly procedures.
Technicians will find detailed specifications, tolerances, and troubleshooting guides.
Proper use of this manual is key to ensuring the longevity and powerful performance of your Komatsu breaker attachment.
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SEN06675-04
Shop Manual
KOMATSU HYDRAULIC BREAKER Serial numbers
JMHB170H-1 51201~
This shop manual is for a hydraulic breaker.
For the operation of excavators, please refer to
the shop manual for the excavator being used.
NOT RESPECTING THESE RECOMMENDATIONS
RULES CAN CAUSE DAMAGES OR CORPOREAL
ACCIDENTS FOR WHICH THE CONSTRUCTOR
βKOMATSUβ WILL NOT BE RESPONSIBLE.
BM86809423-04
--- Page 3 ---
Handling of hydraulic equipment
β’ With the increase in pressure and precision of the hydraulic components, the most common cause of a
failure is dirt (foreign material) in the hydraulic circuit. Therefore, special care must be taken when adding
hydraulic oil, or when disassembling or assembling the hydraulic components.
Be careful of working environment Replacing hydraulic oil while its temperature
is high
β’ Avoid adding hydraulic oil, replacing filters, or
repairing the machine in rain or high winds, or β’ When the hydraulic oil is warm, it flows easily. In
at places where there is a lot of dust. addition, sludge can also be drained from the
circuit together with the oil. So, it is better to change
the hydraulic oil while it is warm. When changing
Disassembly and maintenance work in the field
the hydraulic oil, the old oil must be drained as
β’ When disassembly or maintenance work of the much as possible.(Drain the oil not only from the
hydraulic is performed in the field, there is hydraulic tank, but also from the filter housing and
danger of dust entering the components. It is the drain plug hole in the circuit.) If the old oil is left
also difficult to check the performance of the in the system, the contaminant and sludge in the oil
components after repairs, so it is desirable to mix with the new oil and shorten the life of the new
use the component exchange service. The hydraulic oil.
disassembly and assembly of the hydraulic
Flushing operations
components must be performed in the
specially arranged dust proof workshop and β’ After disassembling the equipment or when
the performance test of the components must changing the hydraulic oil with new one, flush the
be performed with the special testing system to remove the contaminant and sludge left
equipment. in the hydraulic circuit as well as the oil which
includes them. Normally, flushing is performed
twice. Primary flushing is performed by use of the
flushing oil and the secondary flushing is
performed by use of the specified hydraulic oil.
Sealing of opening (prevention of flowing out
of oil)
β’ Plug the openings of the piping and the device
which have been removed to prevent foreign
material from entering and oil from flowing out.
NOTICE
Do not expose or stuff the openings, otherwise
foreign material may enter or leaked oil may pollute
the environment.
Do not discard the oil inconsiderately. Ask the Cleaning operations
customer for disposal or bring it back to dispose β’ After repairing the hydraulic equipment (pump,
it appropriately. control valve, etc.) or when the machine is in
operation, perform oil cleaning to remove the
REMARK sludge or contaminant in the hydraulic oil circuit.
Cover openings tightly with caps, tapes, or plastic The oil cleaning equipment can remove the ultra
bags if it is hard to provide the plugs. fine (approximately 3ΞΌm) particles that the filter
built in the hydraulic equipment can not remove.
So, it is an extremely effective device.
Preventing intrusion of foreign materials during
refilling operations
β’ Care must be taken when adding hydraulic oil
so that foreign material does not enter. Keep
the oil filler port and the area around it, oil
supply pump and oil container clean. If an oil
cleaning device is used, it is possible to
remove the dirt that is collected during storage.
It is a preferred means of cleaning.
KOMATSU
2021 - rev 03 11
JMHB170H
BM86809423
--- Page 4 ---
KOMATSU
2021 - rev 03 21
JMHB170H
BM86809423
--- Page 5 ---
17
16
kg
24 mm lb
15/16β MIN MAX
94 255
207 562
27 mm
1β1/16
KOMATSU
2021 - rev 03 31
JMHB170H
BM86809423
--- Page 6 ---
41
2
1
3
4
KOMATSU
2021 - rev 03 41
JMHB170H
BM86809423
--- Page 7 ---
1
EU - P600
US - 360
3
OK
2
KOMATSU
2021 - rev 03 51
JMHB170H
BM86809423
--- Page 8 ---
1
45 mm 45 mm
1.8β 1.8β
Γ 8 mm Γ 8 mm
Γ 0.3β Γ 0.3β
2
3
KOMATSU
2021 - rev 03 61
JMHB170H
BM86809423
--- Page 9 ---
4 kg
lb
92,3
203.5
5
6
KOMATSU
2021 - rev 03 71
JMHB170H
BM86809423
--- Page 10 ---
42 43
2
1
1 3
38 mm
4 1β1/2
400 Nm
295 ft.lb
3
2
2
1 3
4
1 3
4 44
KOMATSU
2021 - rev 03 81
JMHB170H
BM86809423
--- Page 11 ---
78
kg
lb
MIN MAX
94 255
207 562
79
x12
24 mm
15/16β
X 24
27 mm
1β1/16
470 Nm
347 ft.lb
x12
KOMATSU
2021 - rev 03 91
JMHB170H
BM86809423