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Maruzen BH112 - User Manual

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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)

Table of Contents

Questions and Answers

  • E
    erin10Aug 14, 2025
    Why does my Maruzen BH112 not start when I grip the control lever?
    • I
      ihughesAug 14, 2025
      If your Maruzen Power Tool doesn't start when you grip the control lever, several issues could be the cause. First, ensure the power source is on by turning the switch lever to the 'On' position. Check that all hoses and couplers are properly connected. The relief valve pressure might be too low; adjust it to between 140 and 210 kgf/? (13.7–20.6 MPa). Also, the high pressure and oil return hoses could be connected inversely and must be corrected.
  • D
    Daniel KnightAug 17, 2025
    What to do if my Maruzen BH112 has weak hammering or low hammering speed?
    • A
      Adam KellyAug 17, 2025
      If your Maruzen Power Tool is hammering weakly or at a low speed, it could be due to a low rate of oil flow from the power source. To resolve this, increase the engine rotation rate to increase the oil flow, adjusting it to the necessary rate. Another possible cause is that the pressure in the relief valve is set too low. Adjust the pressure to be within the range of 140 – 210 kgf/? (13.7–20.6 MPa). Also, the back pressure may be too high, so try using a larger diameter hose for the return side.
  • K
    khopkinsAug 21, 2025
    What to do if the Maruzen BH112 Power Tool breaker stops activating during operation?
    • D
      Dr. Terri Hanson DVMAug 21, 2025
      If the Maruzen Power Tool breaker stops activating during operation, check that all couplers are properly connected. If the issue persists, the control valve may be damaged and need replacing.
  • U
    umillerAug 25, 2025
    Why is my Maruzen Power Tool hammering weakly even at normal speed?
    • S
      scottmurphyAug 25, 2025
      If your Maruzen Power Tool is hammering at normal speed but weakly, it might be due to low accumulator gas pressure. Refill Nitrogen gas to 40kgf/? (3.9MPa). Alternatively, the accumulator diaphragm may be damaged and require replacement.
  • J
    Justin FoxAug 28, 2025
    How to decrease hammering speed of my Maruzen Power Tool?
    • A
      Amanda MartinezAug 28, 2025
      If your Maruzen Power Tool is hammering strongly and at high speed, the oil flow rate may be too high. Reduce the engine rotation rate to decrease the oil flow.
  • S
    Sara RamirezAug 31, 2025
    Why is the high pressure hose of my Maruzen BH112 Power Tool shaking intensely?
    • N
      Nicholas FoxAug 31, 2025
      If the high-pressure hose of your Maruzen Power Tool is shaking intensely, the accumulator diaphragm may be damaged and need replacing.
  • P
    Priscilla JimenezSep 3, 2025
    Why is my Maruzen BH112 Power Tool leaking oil from the front end?
    • K
      kevin09Sep 4, 2025
      If there's profuse oil leakage from the front end of your Maruzen Power Tool, it could be due to damage of the U cup packing. Consider replacing the U cup packing. Also, check for any scratches on the piston rod, as these can damage the U cup packing as well. If scratches are present, remove them and replace the U cup packing.
  • C
    Claudia PenaSep 7, 2025
    Why is my Maruzen BH112 leaking oil from the control lever?
    • T
      Tyler GloverSep 7, 2025
      If there is an oil leakage from the control lever of your Maruzen Power Tool, the O ring may be damaged, worn, or hardened. Replace the O ring.
  • A
    Adam JohnsonSep 10, 2025
    Why is the latch on my Maruzen Power Tool nearly coming off?
    • A
      Alexander BishopSep 10, 2025
      If the latch on your Maruzen Power Tool is nearly coming off, it could be due to damage of the lock spring. Replace the lock spring. Alternatively, the latch itself may be worn and need replacing.

Summary

Foreword

Manual Importance and Usage

Provides an introduction to the manual and its importance for safe and effective use.

Safety Information

Safety Alert Classifications

Explains DANGER, WARNING, CAUTION symbols used for hazard communication.

Safety Alerts and Precautions

Personal Protective Equipment

Lists required PPE like helmet, goggles, boots, gloves, and hearing protection.

Operating Condition Restrictions

Lists conditions to avoid for safe operation, such as fatigue, injury, or impairment.

Operational Cautions

Handling Hot Parts and Equipment Lending

Warns against touching hot parts and emphasizes safety when lending equipment.

Operation Hazards

Advises against blank hammering to prevent damage and injury from flying tools.

Work Area and System Safety

Bystander and High-Pressure Gas Safety

Covers safety for bystanders and warnings related to high-pressure gas in the accumulator.

Introduction

Intended Uses

Lists the intended purposes for which the hydraulic breaker is designed.

Prohibited Situations

Details situations where the breaker should not be operated.

Specifications and Descriptions

Technical Specifications

Details key specifications such as weight, dimensions, pressure, and oil flow.

Component Identification

Illustrates and labels the main components of the hydraulic breaker.

Precaution Labels and Positions

Label Placement and Legibility

Shows the location of precaution labels on the machine and emphasizes maintaining their legibility.

Inspections Before Each Operation

Pre-Operation Checklist

Lists essential inspection items and their countermeasures to ensure good condition before use.

Guidelines

Power Source and Connection Guidelines

Provides guidelines for connecting to power sources and couplers, and handling hoses.

Operation Safety Guidelines

Offers advice on safe operation, including tool handling, jobsite obstacles, and lifting.

Maintenance and Handling Precautions

Details precautions for hose replacement, coupler detachment, and oil level management.

Operations

Connecting Hydraulic Breaker

Step-by-step instructions for connecting the breaker hoses to the power source.

Loading and Starting Operation

Guides on loading the tool, locking the latch, warming up the engine, and starting the breaker.

Daily Check Out

Pre-Operation Checks

Brief checks for oil leakage and tool damage before each operation.

Periodical Inspection

Scheduled Maintenance Items

Lists components requiring inspection or replacement based on operating hours or time.

Installation of Side Handle

Side Handle Mounting Procedure

Provides instructions for correctly installing the side handle with bolts and washers.

Troubleshooting

Breaker Not Starting

Addresses issues when the control lever does not initiate operation.

Weak Hammering or Low Speed

Troubleshoots problems with reduced hammering force or speed.

Hammering Performance Issues

Covers solutions for normal speed but weak hammering, and strong hammering in high speed.

Operation and Leakage Problems

Addresses issues like stopping during operation, oil leaks, and latch problems.

Exploded View

Model BH112 Component Breakdown

Provides a detailed exploded view diagram identifying all parts of the Model BH112 breaker.

Parts List

Model BH112 Parts Identification

Lists all parts for the Model BH112, including codes, descriptions, and quantities.

Assembly Group Identification

Details parts included in various assembly groups like Accumulator Assy and Seal Kit.

Maruzen BH112 Specifications

General IconGeneral
BrandMaruzen
ModelBH112
CategoryPower Tool
LanguageEnglish