Komatsu JMHB220H-1 Attachment Shop Manual (SEN06676-08)

This Komatsu JMHB220H-1 Attachment Shop Manual (SEN06676-08) is aimed at the hydraulic hammer attachment itself, not the carrier machine. In the field, this is the book you crack open when the breaker’s hitting weak, misfiring, or coming apart and you can’t afford to guess. Techs, shop mechanics, and anyone rebuilding or troubleshooting the JMHB220H-1 usually reach for this type of manual when parts are on the bench and downtime is already costing money.

What this manual helps you do

• Trace hydraulic and mechanical faults inside the JMHB220H-1 attachment using the kind of step-by-step checks most shops rely on.
• Follow teardown and reassembly sequences for the hammer body, internal components, and wear parts so you don’t damage high-cost pieces.
• Diagnose performance issues like weak impact, irregular blows, or oil leaks with structured inspection and test procedures.
• Verify correct installation interfaces between the JMHB220H-1 attachment and the carrier, so you don’t chase “ghost” problems caused by setup.
• Handle workshop-level repairs with the right order of operations, special tools, and inspection points that these manuals typically spell out.

Who this is for

This is for a field tech, shop mechanic, or dealer-level service person doing actual repairs on the Komatsu JMHB220H-1 Attachment. If you just need operating tips or daily greasing info, you’re better off with the operation/maintenance manual, not this shop manual.

FAQ

Q: Is this a PDF I can download and search?

A: Yes, it’s a PDF you can download, search by keyword, and print the pages you need for the jobsite.

Q: Does it go deep enough for full rebuilds, or just basic checks?

A: This is a shop manual, so it’s aimed at full workshop repairs, disassembly, inspection, and reassembly of the JMHB220H-1 attachment.

Q: How do I know if it matches my specific hammer version?

A: Check that your attachment is labeled Komatsu JMHB220H-1 and then match your documentation needs to book number SEN06676-08; if your ID plate shows a different model designation, this isn’t the right manual.

Bottom line: If you’re repairing, rebuilding, or troubleshooting a Komatsu JMHB220H-1 hydraulic breaker, this is the right manual. If you only run the hammer and don’t open it up, you should keep looking for the operator or maintenance guide instead.

Table of Contents:

• Foreword EN
• Foreword FR
• ISO
• Seal kit
• Dismantling
• Inspection
• Repairing
• Assembling
• Accumulator
• Tooling
• Long term storage
• Pressurization
• Grease pump

Komatsu