FOR THE SAFETY PURPOSE, PLEASE READ THIS MANUAL THROUGHLY
BEFORE ATTEMPTING TO USE THIS BREAKER. ANY FALES
OPERATING PROCEDURES WILL CAUSE DAMAGES OF THE MACHINE.
ALWAYS KEEP THIS MANUAL TO AN EASILY ACCESSABLE PLACE.
HYDRAULIC HANDHELD BREAKER
MODEL BH112
OPERATING MANUAL
MARUZEN KOGYO CO., LTD.
CAUTION
(Revised March 30, 2017)
2
FOREWORD
This manual is an important part of your equipment. It provides
rules and guidelines which will help you use this machine safely and
effectively. You MUST familiarize yourself with the functions and
operations by reading the manual thoroughly before you begin using
this machine. For your safety, it is especially important that you
read and observe all precautions in this manual and on the machine.
The precautions MUST be followed strictly at all times when
performing operation and maintenance. * Fail to follow the
guidelines and safety alerts in the manuals and on the machine, or
use this machine in alternative ways from the manuals may result in
system failure or serious personal injury.
Keep this manual with the equipment or in an easily accessible place
in all times for future reference. Make sure all personnel involved in
working on this machine can consult it periodically. In case this
manual should be lost or damaged, immediately contact us or your
dealer to purchase a new copy.
We recommend you always use Maruzen genuine components and
parts. Replacing components and parts from other sources may cause
damages to this machine and endanger operators.
MARUZEN KOGYO CO., LTD.
155-8 NAGABUSE, MISHIMA-SHI,
SHIZUOKA-KEN, 411-0824, JAPAN
3
CONTENTS
Safety Information .............................................................. 4 ～ 7
Safety Alert Classifications ........................................... 4
Safety Alerts .................................................................. 5 ～ 7
Introductions ....................................................................... 8
Specifications & Descriptions ............................................. 9
Precaution Labels and Positions ........................................ 10
Inspection before Each Operation ...................................... 11
Guidelines ........................................................................... 12 ～ 13
Operation............................................................................. 13 ～ 14
Daily Check Out .................................................................. 15
Periodically Inspection ....................................................... 15
Installation of Side Handle................................................. 15
Troubleshooting ................................................................... 16～ 17
Exploded View I .................................................................. 18
Parts List ............................................................................. 19 ～ 20
4
SAFETY INFORMATION
To enable you to use this machine safely, safety precautions and labels
are given in this manual and affixed to the machine to give
explanations of situations involving potential hazards and of the
methods of avoiding such situations.
SAFETY ALERT CLASSIFICATIONS
The following safety alert symbols are used to inform you that there is
a potential hazardous situation that may lead to personal injury or
damage.
In this manual and on machines labels, the following safety alert
symbol are used to express the potential level of hazard.
** Safety alert symbols are to emphasize all operation which, if not
strictly followed, could result in a life-threatening situation, bodily
injury or damage to equipment.
DANGER
Indicates an imminently hazardous situation
which, if not avoided, could result in death or
serious injury.
WARNING
Indicates a potentially hazardous situation
which, if not avoided, could result in death or
serious injury.
CAUTION
Indicates a potentially hazardous situation which,
if not avoided, could result in minor or moderate
injury.
5
DO NOT OPERATE THE MACHINE UNLESS THE FOLLOWING SAFETY
INSTRUCTIONS HAVE BEEN THOROUGHLY READ AND UNDERSTOOD!
Do not operate the equipment if you are
or if your
1. taking medication, feeling drowsy, feeling unwell or feeling
tired.
2. under the influence of drugs or alcohol.
3. hands, feet, lower back or other parts of your body hurt or
being injured.
* Failure to observe this precaution can result serious injury or
even death.
WARNING
WARNING
Before operating the equipment, be
sure to ware personal protective
equipments such as follows:
1. Helmet
2. Protective goggles
3. Protective boots
4. Safety gloves
5. Hearing Protection
SAFETY ALERTS
6
CAUTION
Do not touch the machine with your bare
hands
1. The oil tank may become hot under continuous running
.
Do not touch the equipment with your bare hands.
2. Tools may become hot under continuous use, make sure
to ware gloves before any contact with the tools.
* Failure to observe this precaution can result getting
burned
CAUTION
When lending someone the equipment
Make sure the safety instructions have been thoroughly
read and fully understood by the person who is going to use
the equipment.
WARNING
Avoid Blank Hammering
Operating the equipment horizontally may cause the
chisel’s sudden flying out.
Excessive blank hammering may be considered
equipment abuse and may cause equipment damage.
Failure to observe this precaution can result damage to
the breaker.
7
WARNING
Never operate the breaker when
bystanders are in the work area
1. Do not operate the breaker if any people are within
the area where flying debris or movement of the
breaker may injure them.
2. For preventing flying debris, make sure protection
fences are being set up.
Failure to observe this precaution can result personal
injury.
WARNING
Be special cautions to high pressure
gas
1. High pressure gas was held inside the accumulator of
the breaker.
2. Do not loosen the nut unless it is necessary for
maintenance.
Failure to observe this precaution can result serious injury
8
INTRODUCTION
1. This hydraulic breaker is designed to be used for the following
purposes.
(1) Breaking concrete and asphalt
(2) Anchoring and pile driving
(3) Digging or breaking hard soil
(4) Compacting soil
(5) Cutting asphalt
2. DO NOT operate this breaker on the following situations:
(1) Drench part of the breaker or whole breaker into water or
seawater.
(2) Connect with power source which its oil flow and pressure exceeds
the range prescribed.
(3) Operating with oil temperature below 10℃ or over 100℃.
(4) use tool which its shank size is different from prescribed
(5) Attach to other construction machinery.
(6) Use the equipment for purposes other than stated in this manual.
9
SPECIFICATIONS & DESCRIPTIONS
Overall Weight 11kg (Without tool)
Overall Dimensions 566mm X 156mm
Working Pressure 90～130kgf/㎠
(8.8～12.7Mpa)
Max. Pressure 210kgf/㎠
(20.6MPa)
Oil Flow Blow per Minute
(1)10～12l/min….1300bpm
(2)12～151/min….1500bpm
(3)15～201/min….1700bpm
(4)20～251/min….2200bpm
Shank Size Hex. 22mm X 83mm
Coupling 3/8” Couplers
Max. Hose Length 1/2” X 10m
Optional Side Handle
Control Lever
(Standard)
Handle
Accumulator
Standard Hoses
Coupler
(Male)
Coupler (Female)
Tool Side Handle
10
PRECAUTION LABELS AND POSITIONS
* Make sure labels are legible. Replace new
one when they are illegible.
11
INSPECTIONS BEFORE EACH OPERATION
For the purpose of keeping the breaker in good
condition, make sure the following inspection items
are done each time before using. (Refer the drawing
on the right)
Inspection Items
Countermeasures
1. Loose nut Tighten the loosen nut
2. Loose handle attachment
Tighten handle attachment
3. Loose hose attachment Tighten hose attachment
4. Cracks on handle grips Replace new one
5. Worn points found in latch
Replace new one
6. Damage, cracks on tool Replace new one
7. Loose bolts on side handle*
Tighten the loosen bolts
8. Oil leakage
Ask your dealer for repair
and
service
9. Cracks on control lever Replace new one
* Optional
Loose Nut
Loose Handl
e attachment
Loose Bolt
Loose Hose Attachments
Damage on tools
Oil leakage
Loose side handle
worn latch
worn point
12
GUIDELINES
Following these guidelines while using this breaker:
1. When intend to use other power source (other than Maruzen
hydraulic power units), make sure the pressure of the power
source is in the range of 140 ～ 210kgf/㎠ and oil flow is in the
range prescribed
2. When connecting and disconnecting couplers, make sure dirt, dust
and other foreign substance does not enter or attach to couplers
and hoses.
3. Make sure the power source is OFF when connecting the breaker
to the power source.
4. Maruzen original tools are highly recommended. Consult your
dealer for more specifics of tools.
5. If the oil temperature is below 10℃, warm up the breaker before
start operating.
6. Pay attention to the followings while operating the breaker.
(1) Be cautious for not being injured by the front of the tool.
(2) Be cautious for not being tripped by the extension hoses.
(3) Make sure there are no obstacles at jobsite. (Be cautious not
being tripped by obstacles while operating)
(4) While pulling out the breaker from the broken objects, be
cautions for not being fall over.
(5) Make sure the breaker was placed in horizontally. Fail to
place the breaker horizontally after operating can cause
injury by sudden falling of the breaker.
(6) Be cautious not to injure your back while lifting the breaker.
7. In case of sudden hydraulic hose breakage and hydraulic oil belch
out. STOP the power source IMMEDIATELY.
8. Replace new hoses when they are worn or when oil exudes from
them.
9. When detach couplers, a small amount of oil may slip out. Make
sure that surrounding area does not get dirty by oil.
10. When detach from power source, attach two hoses to each other.
CAUTION
13
11. When frequently attach and detach to the power source, hydraulic
oil will decrease accordingly. Always make sure the hydraulic oil
level before operating and refill if necessary.
12. After the operation, use tool to push up the piston.
Immediately STOP the power source if the breaker does not stop after
releasing the control lever. Ask Maruzen dealer for repair and
service before the next operation.
OPERATIONS
CAUTION
2.
Con
nect the other side of extension
hose ② to the power source ③
1. Connect hydraulic breaker
’
s standard
hose ① and extension hose ②
14
4. Start engine in power source and let engine run for a while to
warm up the machines.
3. Unlock the latch ④on breaker, load
the tool⑤ and lock the latch again.
5. Clasp the handle grip⑥, bear down
the breaker, clasp the control lever
gently and let the breaker start
running.
15
DAILY CHECK OUT
Check before each operation
1. Check if there is any oil leakage from hoses or breaker itself.
2. Check if there are any cracks or damage in tools.
PERIODICAL INSPECTION
Ask your dealer for the periodical inspections.
Inspection Items
Operating Hours
Nitrogen
gas charge in accumulator
300 hours or 1 Year
Replacement of accumulator diaphragm
500 hours or 2 years
Replacement of Valve Rod O ring
500 hours or 2 years
Replacement of U
-
cup packing
500 hours or 2 years
Replacement of each O ring
More than 3 years
* Accumulator Nitrogen gas pressure: 3.9MPa (40kgt/㎠)
INSTALLATION OF SIDE HANDLE
(1) Place side handle on the flat part of front end of the breaker.
(2) Set washers with bolts. Screw the bolts with torque 3.5kgf・m
(34.3N・m)
(3) Make sure if side handle has been installed firmly.
Bolt Washer
Front End
Side Handle
16
Symptoms Causes Countermeasures
Grip the control lever but does not start
1. Power source is off (Switch lever is
not in ON position)
2. Hoses are not connected
3. Couplers are not connected properly
4. Relief valve pressure is set too low
5. Damage of control valve
6. Control valve is not functioning
7. High pressure side and oil return
side was connected inversely
1. Start the power source (Turn the
switch lever to On position)
2. Connect hoses
3. Check out if all the couplers have
been connected properly
4. Adjust pressure to 140～210kgf/㎠
(13.7～20.6MPa) *
5. Replace a new control valve *
6. Disassemble breaker, clean and
remove dirt and dust between
control valve and valve body *
7. High pressure hoses is connected to
the upper side of the breaker
Functionin
g but weak hammering or low
hammering speed
1. Low rate of oil flow from power
source
2. Pressure in relief valve in power
source is set too low
3. Control valve does not function
properly
4. Back pressure is too high
1. Turn the engine rotation rate up
and
increase the rate of oil flow (Adjust
oil flow to the necessary rate)
2. Adjust pressure to the range of 140
～210kgf/㎠ (13.7～20.6MPa) *
3. Remove and clean the joint of control
lever and valve body *
4. Use bigger Diameter hose for return
side
Hammering in normal speed, but week
hammering
1. Low accumulator gas pressure
2. Damage of accumulator diaphragm
1. Refill Nitrogen
gas
40kgf/㎠ (3.9MPa) *
2. Replace diaphragm *
Strong hammering and in high speed
1. High rate of oil flow
1. Turn the engine rotation rate down
to decrease the rate of oil flow
TROUBLE SHOOTING
17
(Adjust oil flow to the right range)
The breaker stops activating during
operation
1. Couplers are not connected
2. Damage of control valve
1. Check each connected parts
2. Replace a control valve *
Oil leakage from control lever
1. Damage, wear or harden of O ring
1. Replace O ring
*
Profuse
Oil leakage from front end
1. Damage of U cu
p packing
2. Damage of U cup packing due to the
scratch of piston rod.
1. Replace U cup packing
*
2. Replace U cup packing, remove the
scratch on piston rod *
Latch is nearly coming off
1. Damage of lock spring
2. Ware of latch
1. Replace lock spring
*
2. Replace latch *
High pressure hose shakes intensely
1. Damage of accumulator diaphra
gm 1. Replace diaphragm
*
Release
the control lever
but the breaker
does not stop
1. Foreign substance is caught in the
valve rod
1. Disassemble, clean and adjust *
For items with *, ask Maruzen dealers for service and maintenance.
18
EXPLODED VIEW
MODEL BH112
19
No. Code Descriptions Q’ty No. Code Descriptions Q’ty
1 M2LTC101A Valve Body 1 29 OBP-14 Back Up Ring 1
2 M2LTC102A Front End 1 30 OBP-5 Back Up Ring 1
3 M2LTD103A Shell 1 31 W18S1 Seal Washer 2
4 M2LTD104B Cylinder 1 32 W6S1 Seal Washer 1
5 M2LTD125A Piston (B) 1 33 BH-8 X 80 Bolt 4
6 M2LTE107A Chisel Bushing 1 34 BH-8 X 15 Bolt 6
7 M2LTE108A Valve Guide 1 35 BH-10 X 50 Bolt 1
8 M2LTE109A Lid (S) 1 36 PR-16 X 50 Pin 1
9 M2LTE124A Inner Tube 1 37 PR-10 X 50 Pin 1
10 M2LTE115A Cap 1 38 PR-6 X 20 Pin 1
11 QB-5/16 Steel Ball 1 39 MIKTE173 Needle Roller 1
12 M1XTE108A Control Valve 1 40
21091･3--30--
High Pressure Hose
1
13 M1HTE107A Spring (P) 1 41
21091･3--45--
Low Pressure Hose 1
14 1120-413-D Cap Bolt 1 42 QC-03F Coupler (Female) 1
15 MB02E006A Diaphragm 1 43 QC-03M Coupler (Male) 1
16 M1KTE111A Valve Rod 1 44 BPH1-PT1/8 Plug 10
17 1120-419-F Latch (1”) 1 45 1120-414 Handle Grip 1
18 1110-410-01 Lock Spring 1 46 M2LTZ162A Handle Frame(LS) 1
19 IUIS 30, 40,6 U Cup Packing 1 47 M2LTZ163A Handle Frame(PS) 1
20 DS-30385 Dust Seal 1 48 M2LTE114A Bush Rod 1
21 OG-60 O Ring 1 49 M2LTE113A Control Lever 1
22 OS-70 O Ring 1 50 1120-422 Handle Pipe 1
23 OP-22 O Ring 1 51 BH-6 X 15 Bolt 4
24 OP-5 O Ring 1 52 BH-8 X 15 Bolt 2
25 OP-14 O Ring 1 53 PR-5 X 22 Pin 1
26 OP-12.5(1B) O Ring 1 54 M1XTE117A Maruzen Seal 1
27 OBG-60 Back Up Ring 1 55 WS-8 Washer 3
28 OBP-22 Back Up Ring 1 56 MB02Z025A Handle Stay 1
PARTS LIST MODEL BH112
20
No. Code Descriptions Q’ty
57 MB02Z026A Half 1
58 PR-8×30 Spring Pin 1
59 BH-8X35 Bolt 1
60 M1ZTE127A Orifice Plug (1.9mm) 1
61 BH-8×18 Bolt 2
A1 M2LTZ501A Accumulator Assy 3, 8, 15, 10, 14, 27, 32 (Without nitrogen gas) 1
A2 M2LTZ502A Cylinder Assy 4, 44 (5) 1
A3 M2LTZ503A Inner Tube Assy 9, 11, 13, 44 1
A4 M2LTZ504A Front End Assy 2, 6 1
A5 M1XTZ505A Valve Rod Assy 16, 24, 30 1
A6 M2LTZ506A Valve Guide Assy 7, 25, 29 1
A7 M2LTZ507A Valve Body Assy 1, 44 (5), 60 1
A8 M2LTZ508A Cap Nut Assy 10, 27 1
A9 MB24Z509A Cap Bolt Assy 14, 32 1
A10 MB02E031A Side Handle Assy 45, 50, 52 (2), 55 (3), 57, 58, 59 1
A11 M2LTZ511A Seal Kit 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,32 1
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