JTHB08-3
JTHB10-3
JTHB20-3
JTHB20S-3
JTHB30-3
JTHB30S-3
JTHB40-3
JTHB40S-3
JTHB50-3
JTHB60M-3
JTHB60S-3
JTHB60-3
JTHB120-3
JTHB120S-3
JTHB160-3
JTHB210-3
JTHB210S-3
JTHB210C-3
JTHB350-3
JTHB450-3

Komatsu JTHB450-3 Operation and Maintenance Manual (PEN00651-07) (S_N 10001-99999)

On a JTHB450-3 breaker that spends its life in rock, concrete, and frozen ground, this manual is what I lean on to keep it hitting hard without beating itself to death. It walks you through a sensible rhythm of checks and services so you can spot bushing wear, pin play, or nitrogen issues before they turn into downtime. If I’ve got a breaker that starts losing impact or running hot on a demolition job, this is the document I use to trace the problem step by step and verify it’s the breaker, not the carrier, causing the trouble.

Applications & Use Cases

• Plan preventive maintenance around your actual workload so the breaker is serviced before a major outage, not after.
• Inspect wear points—tool, bushings, tie rods, hoses—in a logical order to catch early failures.
• Verify setup on a new carrier, checking mounting, hose routing, and operating habits to avoid side-loading and cavitation.
• Troubleshoot weak impact or slow cycling by isolating hydraulic, gas, or mechanical causes.
• Train operators on correct warm-up, greasing habits, and shutdown to keep the tool straight and seals alive.

FAQ

Q: Can I keep this manual on a tablet in the cab?

A: Yes, it’s handy to have it digitally so you can zoom diagrams and follow procedures right at the machine.

Q: Is it worth printing certain pages?

A: I’d print the daily/weekly check routines and keep them in a binder in the shop for quick reference during inspections.

Safety Note

Always depressurize and secure the breaker and carrier before any inspection, adjustment, or service work.

Komatsu JTHB450-3 Index:

• COVER
• FOREWORD
  • BEFORE READING THIS MANUAL
  • IMPORTANT SAFETY INFORMATION
  • OPERATION AND QUALIFICATIONS
  • PRODUCT INFORMATION
    • LOCATION OF SERIAL NUMBER
    • PRODUCT IDENTIFICATION NUMBER (PIN) MACHINE SERIAL NO. PLATE
    • SERVICE METER LOCATION
• CONTENTS
• SAFETY
  • SAFETY LABELS
    • POSITION FOR HYDRAULIC BREAKER SAFETY LABEL
    • SAFETY LABELS
    • CAUTION FOR HIGH PRESSURE GAS
  • GENERAL PRECAUTION FOR SAFETY
    • WORKING WEAR AND PERSONAL PROTECTIVE ITEMS
    • FALLING OBJECTS, FLYING OBJECTS AND INTRUDING OBJECTS PREVENTION
    • PROTECTION AGAINST FALLING OR FLYING OBJECTS
    • CHECKS FOR HYDRAULIC PIPING
    • WARNING – DO NOT DISASSEMBLE
    • WARNING – UNAUTHORIZED MODIFICATION
    • WARNING – HIGH TEMPERATURE OIL
    • WARNING – HIGH PRESSURE OIL
    • WARNING – HIGH PRESSURE GAS
    • WARNING – USE SUITABLE TOOLS
    • WARNING – POSITION THE HYDRAULIC BREAKER
  • SAFETY INFORMATION
    • SAFETY OPERATION
    • IF ABNORMALITIES ARE FOUND
    • DISTANCE TO HIGH VOLTAGE CABLES
    • SAFETY AT JOBSITE
    • FIRE PREVENTION AND EXPLOSION PREVENTION
    • NOISE
  • PRECAUTION FOR MAINTENANCE
    • WELDING INSTRUCTIONS
    • HIGH-PRESSURE OIL
    • HIGH PRESSURE HOSES AND PIPING
    • DISPOSE OF WASTE MATERIALS
  • TRANSPORTATION
    • TRANSPORTATION PROCEDURE
    • LIFTING BREAKER
• OPERATION
  • SPECIFICATIONS
  • STRUCTURE
  • PIPING FOR THE HYDRAULIC BREAKER
  • GREASE SELECTION AND CONTROL
  • HYDRAULIC OIL RECOMMENDATION
  • HYDRAULIC OIL TEMPERATURE CONTROL
  • HYDRAULIC OIL CONTAMINATION CONTROL
  • INSTALLATION OF THE HYDRAULIC BREAKER ONTO THE EXCAVATOR
  • INSTALLATION OF CHISEL
  • REPLACEMENT OF CHISEL
  • LUBRICATION OF CHISEL
  • INSPECTION PRIOR TO OPERATION
  • TEST RUN
  • OPERATION OF HYDRAULIC BREAKER
  • PRECAUTIONS DURING OPERATION
  • DISMANTLING THE BREAKER
  • STORAGE OF THE BREAKER
    • (1) STORAGE FOR ONE MONTH
    • (2) STORAGE FOR MORE THAN ONE MONTH
• MAINTENANCE AND INSPECTION
  • MAINTENANCE INFORMATION
    • SERVICE METER READING
    • KOMATSU GENUINE REPLACEMENT PARTS
    • KOMATSU GENUINE LUBRICANTS
    • FRESH AND CLEAN LUBRICANTS
    • CHECK DRAINED OIL AND USED FILTER
    • WELDING INSTRUCTIONS
    • BLEEDING AIR FROM HYDRAULIC CIRCUIT
    • PRECAUTIONS WHEN INSTALLING HYDRAULIC HOSES
    • CHECKS AFTER INSPECTION AND MAINTENANCE
  • OUTLINE OF SERVICE
    • HANDLING OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC OIL
    • GREASE
    • PERFORMING KOWA (KOMATSU OIL WEAR ANALYSIS)
    • FILTERS
  • STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS
  • MAINTENANCE AND INSPECTION
  • MAINTENANCE SCHEDULE
  • MAINTENANCE PROCEDURE
    • INITIAL 10 HOURS OR 2 DAYS MAINTENANCE
    • WHEN REQUIRED
    • EVERY 2 HOURS MANTENANCE
    • DAILY MAINTENANCE (CHECK BEFORE STARTING)
    • EVERY 100 HOURS OR 1 MONTH MAINTENANCE
    • EVERY 300 HOURS OR 3 MONTHS MANTENANCE
    • EVERY 600 HOURS OR 6 MONTHS MANTENANCE
    • EVERY 1200 HOURS OR 1 YEAR MANTENANCE
    • EVERY 4000 HOURS OR 2 YEARS MANTENANCE
• TROUBLE SHOOTING GUIDE
  • OIL LEAKAGE
  • NITROGEN GAS LEAKAGE
  • POOR OPERATION OF BREAKER
  • CHISEL BREAKAGE
• ACCESSORY TOOLS
  • JTHB08-3
  • JTHB10-3
  • JTHB20-3
  • JTHB30-3
  • JTHB40-3
  • JTHB50-3
  • JTHB60M-3
  • JTHB60-3
  • JTHB120-3
  • JTHB210-3
  • JTHB350-3
  • JTHB450-3
  • OPTIONAL TOOLS

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