These Komatsu JRDC210-1, JRDC290-1, JRDC360-1 attachments are heavy demolition/processing tools that live a hard life on the end of mid-size excavators. The people who usually grab this kind of Shop Manual are dealer techs, independent shops, and fleet mechanics who actually tear these attachments apart, not just grease them. They’re usually trying to sort out weak performance, structural damage, or full overhauls after years of abuse. If that’s you, this RENBM0101-00 manual is more or less the “bench-side” book you’d expect.

What this manual helps you do

• Trace hydraulic-related issues in the attachment by following the typical test procedures and flow paths these manuals lay out.
• Check wear limits and service conditions on pins, bushings, jaws, and key structural components before you waste money on parts you don’t need.
• Follow disassembly and reassembly sequences for the JRDC210-1, JRDC290-1, and JRDC360-1 so you don’t crack housings or trap seals during rebuilds.
• Diagnose performance complaints like slow cycling or weak crushing force using the kind of fault charts and inspection steps these shop manuals usually include.
• Handle major repairs after a failure—things like replacing cylinders, rotating units, or main frames—using the workshop-style procedures shown.

Who this is for

This Komatsu JRDC210-1, JRDC290-1, JRDC360-1 Attachment Shop Manual (RENBM0101-00) is aimed at field techs, shop mechanics, and rebuild centers doing real repair work. Operators or fleet managers just looking for daily checks and basic maintenance would be better off with an Operation & Maintenance Manual instead.

FAQ

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

A: Yes, it’s a PDF you can search by keyword and print pages for use at the bench or in the field.

Q: Does it go deep enough for full teardown and rebuilds?

A: This kind of Komatsu shop manual is written for workshop-level repair, including teardown, inspection, and reassembly procedures for the attachment.

Q: How do I know if it matches my exact attachment variant?

A: Check your attachment model and any serial or specification tags, then match them against the JRDC210-1, JRDC290-1, JRDC360-1 designation before you buy.

Bottom line: if you’re the one actually rebuilding or troubleshooting these Komatsu JRDC-series attachments, this is the right manual; if you just run the machine and do light service, keep looking for the O&M book instead.

Table of Contents:

TABLE OF CONTENTS
1. Index and foreword ……………………………………………………………………………… 5
1.1. Foreword, safety and general information ……………………………………………. 5
1.1.1. Safety notes and safety signs ……………………………………………………… 5
1.1.2. Personnel …………………………………………………………………………………. 8
1.1.3. Safety, warning and information labels …………………………………………. 8
1.1.4. Personal protective equipment …………………………………………………….. 9
1.1.5. Use for intended purpose ………………………………………………………….. 10
1.1.6. Use for not intended purpose …………………………………………………….. 10
1.2. Precautions …………………………………………………………………………………… 11
1.2.1. Personnel precautions ……………………………………………………………… 11
1.2.2. Explosion, fire and electric shock precautions ………………………………. 12
1.2.3. Support precautions …………………………………………………………………. 13
1.2.4. Hydraulic equipment precautions ……………………………………………….. 14
1.2.5. Maintenance/repair/assembly/disassembly precautions ………………… 15
1.2.6. Modifications or adjustment precautions ……………………………………… 17
2. Structures and operation …………………………………………………………………….. 19
2.1. Structures of the rotating pulveriser/demolition crusher ……………………….. 19
2.2. Principle function ……………………………………………………………………………. 21
3. Testing and adjustment ………………………………………………………………………. 25
3.1. Circuit diagram ………………………………………………………………………………. 25
3.1.1. Hydraulic motors diagram (rotate function) ………………………………….. 25
3.1.2. Hydraulic cylinder diagram (cutting/crushing function) …………………… 26
3.2. Hydraulic system and connections ……………………………………………………. 26
3.2.1. Connection of hydraulic hoses …………………………………………………… 27
3.2.2. Temperature of hydraulic system ……………………………………………….. 33
3.3. Mounting onto the excavator/carrier vehicle ……………………………………….. 33
3.4. Test run ………………………………………………………………………………………… 35
4. Troubleshooting ………………………………………………………………………………… 36
4.1. Foreword ………………………………………………………………………………………. 36
4.2. Troubleshooting ……………………………………………………………………………… 36
5. Maintenance and repair ……………………………………………………………………… 39
5.1. Maintenance scope and intervals ……………………………………………………… 39

5.2. Lubrication points and intervals ………………………………………………………… 40
5.3. Teeth, blades and jaws maintenance ………………………………………………… 49
5.3.1. Teeth ……………………………………………………………………………………… 49
5.3.2. Blades ……………………………………………………………………………………. 55
5.3.3. Welding of guards/ringlocks ………………………………………………………. 57
5.3.4. Hardfacing ………………………………………………………………………………. 60
5.4. Replacement of seals ……………………………………………………………………… 62
5.4.1. Cylinder seals ………………………………………………………………………….. 63
5.4.2. Swivel seals ……………………………………………………………………………. 72
5.4.3. Bearing slewing ring seals …………………………………………………………. 74
6. Disassembly/ Assembly ……………………………………………………………………… 76
6.1. Disassembly of the rotating pulveriser/demolition crusher ……………………. 76
6.2. Assembly of the rotating pulveriser/demolition crusher ………………………. 124
7. Appendix 1 – Technical Specification …………………………………………………. 187
7.1. Type JRRP – rotating pulveriser……………………………………………………… 187
7.1.1. General information ………………………………………………………………… 187
7.1.2. Hydraulic system ……………………………………………………………………. 188
7.1.3. Dimensions …………………………………………………………………………… 188
7.2. Type JRDC – demolition crusher …………………………………………………….. 188
7.2.1. General information ………………………………………………………………… 189
7.2.2. Hydraulic system ……………………………………………………………………. 189
7.2.3. Dimensions …………………………………………………………………………… 189
7.3. Hole patterns ……………………………………………………………………………….. 190
7.3.1. Hole pattern 140-150 ……………………………………………………………… 190
7.3.2. Hole pattern 150-160 ……………………………………………………………… 191
8. Appendix 2 – Fastener Manual ………………………………………………………….. 192
8.1. Thread treatment ………………………………………………………………………….. 192
8.1.1. Bolted connections with threaded blind holes …………………………….. 193
8.1.2. Bolted connections with nuts or threaded holes ………………………….. 195
8.1.3. Threaded hydraulic fittings connection ………………………………………. 198
8.2. Torque values………………………………………………………………………………. 201
8.2.1. Hexagon bolts and socket head cap bolts ………………………………….. 201
8.2.2. Hydraulic adapters …………………………………………………………………. 201
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8.2.3. Hosefittings (DKOL, DKOS) for hydraulic applications …………………. 202
9. Appendix 3 – Assembly/Disassembly tools ………………………………………….. 203

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