These Komatsu JRDC490-1, JRRP210-1, JRRP290-1 attachments are heavy work tools you’ll see on excavators doing demolition, processing, or material handling. The shop manual is what a field tech or shop mechanic reaches for when the attachment isn’t just “acting funny” but actually needs teardown, inspection, or proper setup. People buying this are usually trying to fix leaks, sort out weak performance, or rebuild after damage, not just do daily checks.

What this manual helps you do

• Trace hydraulic issues in the JRDC490-1, JRRP210-1, JRRP290-1 Attachment by following step‑by‑step testing and inspection routines.
• Diagnose mechanical wear points, then decide what can be adjusted and what needs parts replaced before reassembly.
• Follow disassembly and reassembly sequences so you don’t crack housings, pinch seals, or miss hidden fasteners—very common student mistakes.
• Check alignment, clearances, and functional tests after repair so the attachment runs safely and doesn’t come back with repeat failures.
• Verify you’re using the correct service procedures and tightening patterns that match the Komatsu RENBM0101-00 shop manual standard.

Who this is for

This is aimed at shop mechanics, field service techs, and serious trainees who are actually wrenching on these Komatsu attachments. If you’re just operating the machine or only need basic daily maintenance info, you’d be better off with the operation or O&M manual instead of this shop manual.

FAQ

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

A: Yes, this is a downloadable PDF that you can search on-screen and print pages for use in the shop.

Q: Does it go deep enough for a full rebuild?

A: This kind of Komatsu shop manual usually covers diagnostic checks, teardown, inspection criteria, and reassembly steps suitable for workshop‑level overhauls.

Q: How do I know it matches my attachment version?

A: Match your attachment model designation to JRDC490-1, JRRP210-1, or JRRP290-1 and confirm the RENBM0101-00 reference with your Komatsu dealer if you’re unsure.

Bottom line: If you’re repairing or rebuilding these specific Komatsu attachments, this is the right manual; if you only need operating tips or basic service intervals, keep looking for an operator or 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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