Within the hour you could be tracing charge pressure on a BW 120 AD-4 with this Bomag BW 120 AD-4 Service Training PDF open beside the test port: 107 pages, OEM ID 008 099 86, covering four BW 100 and BW 120 tandem vibratory roller variants of Series 4. Wiring diagrams take up the last third of the book, laid out in function groups with potential and relay cross references, next to hydraulic schematics for the closed-loop travel circuit and troubleshooting tables for travel, vibration and steering. The Kubota engine section walks through valve clearance adjustment and pump installation on the flywheel side. Check charge pressure against the 24 bar spec, and confirm the high pressure relief valves open at 380 bar before you condemn a travel pump. When it is just you and a dead roller, there is no one to ask; this book answers. Print the pages you need and let them take grease on the bench, or work the bookmarks on screen.
Complete the set for your BW 100–120 Series
- Operator Manual: Bomag BW 120 AD-4, 100 AD-4, 100 AC-4, 120 AC-4 Operator Manual
- Operator Manual: Bomag BW 100 AD-4, 120 AD-4, 125 AD-4, 100 AC-4, 120 AC-4, 125 AC-4 Operator Manual
- Repair Manual: Bomag BW 100 AD, 120 AD, 130 AD Repair Manual — Wiring Diagrams
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| List of Components | 2-8 | Engine, Travel Pump, Travel Motor, Vibration Pump, Vibration Motor, Steering Valve |
| Kubota Diesel Engine | 9-19 | View of Engine, Pump Installation on Diesel Engine, View of Diesel Engine, Flywheel Side, Tests and Adjustments, Valve Clearance, Trouble Shooting |
| Travel System | 20-52 | Travel Pump, Travel Pump Control, Charge Pressure Relief Valve, High Pressure Relief Valves, Drum Drive Motor, Wheel Drive Motors on AC-machines, Trouble Shooting Travel System |
| Vibration | 53-64 | Vibration Pump, Vibration Control Valve, Vibration Motor, Trouble Shooting Vibration |
| Steering | 65-70 | Steering Valve Maintenance, Steering Troubleshooting |
| Electric Circuit Diagrams | 71-107 | Table of Contents, Function Groups, Reference Lines, Frames, Potential Cross References, Relay Cross References, Electric System |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Displacement | 28 cm³/rev. | p. 6 |
| High pressure limitation | 380 bar | p. 6 |
| Displacement (drums) | 408 cm³/rev. | p. 7 |
| Displacement (wheels) | 255 cm³/rev. | p. 7 |
| Starting pressure | 210 bar | p. 7 |
| Operating pressure | 100 +/-60 bar | p. 7 |
| Frequency stage 1 | 55 Hz | p. 8 |
| Frequency stage 2 | 70 Hz | p. 8 |
| Engine Power | 25.2 kW | p. 6 |
| Fixed Engine Speed Stage 1 | 2250 rpm | p. 6 |
| Fixed Engine Speed Stage 2 | 2700 rpm | p. 6 |
| Valve Clearance (Cold) | 0.20 mm | p. 6 |
