Bomag BW 120 AC-4 Tandem Vibratory Roller Pdf Service Manual 00891524

Factory Workshop Manual for Bomag BW 120 AC-4 Tandem Vibratory Rollers

The Bomag BW 120 AC-4 Repair & Service Manual (P/N: 00891524) is a comprehensive factory-level technical guide designed for the maintenance, diagnostic, and overhaul of this Dash-4 series compactor. As a "Combination" model, the BW 120 AC-4 features a 1200mm vibratory steel drum at the front and four pneumatic tires at the rear, requiring specialized technical data for both compaction systems. This manual provides the high-fidelity OEM procedures needed to keep your machine operating at peak industrial performance.

Powered by a robust liquid-cooled diesel engine, the BW 120 AC-4 relies on accurate hydraulic calibration and precise electrical diagnostics. This manual delivers detailed service instructions for the series-parallel hydrostatic drive system, dual-drum vibration circuits, and the specialized rear tire traction assembly.

Essential for field technicians, independent repair shops, and fleet maintenance teams, this searchable PDF manual ensures that all repairs meet the original manufacturer's high-performance and safety benchmarks.

Technical Specifications & Maintenance Data

• Engine Systems: Complete service procedures for the diesel powerplant, including fuel system priming, valve clearance settings, and cooling system pressure tests.
• Hydraulic Benchmarks: Accurate pressure settings and flow testing protocols for the travel, vibration, and steering hydraulic circuits.
• Fluid Capacities: Detailed charts for engine oil, hydraulic fluid, and cooling system capacities, including recommended viscosities.
• Torque Values: Factory torque specifications for rubber buffer mounts, articulation joint pins, wheel hub bolts, and critical fasteners.

Comprehensive System & Service Coverage

• Dual-System Vibration: In-depth instructions for the front drum exciter system, including bearing replacement, shaft alignment, and frequency testing.
• Rear Pneumatic Drive: Specialized service routines for the rear tire assembly, focusing on the hydrostatic tire motors and scraper blade adjustments.
• Hydrostatic Transmission: Diagnostic workflows for drive power loss, travel pump rebuilding, and closed-loop hydraulic system flushing.
• Electrical Infrastructure: High-resolution wiring diagrams covering the Dash-4 control logic, safety interlocks, fuse layouts, and dashboard instrumentation.
• Combination Spray System: Service instructions for the dual pressurized sprinkler system used to prevent asphalt pickup on both the steel drum and rubber tires.
• Steering & Articulation: Procedures for resealing steering cylinders and inspecting the pivot bearings for precise machine maneuverability.
• Brake Logic: Full testing and adjustment for the spring-applied hydraulic-release (SAHR) parking brake and emergency stop circuits.

Manual Specifications

• Machine Model: Bomag BW 120 AC-4 (Combination Roller)
• Part Number: 00891524
• Generation: Dash-4 Series
• Format: PDF Digital Download (Fully Searchable & Bookmarked)
• Language: English
• Total Pages: 720+
• File Size: Approximately 112 MB
• Illustrations: High-definition wiring diagrams, hydraulic flow schematics, and exploded assembly views
• Compatibility: Windows, macOS, Android, iOS, and Tablets

Why This Service Manual Is Essential for Repairs

• Targeted Diagnostics: Quickly identify the root cause of hydraulic pressure drops or electrical failures using factory-standard troubleshooting trees.
• In-House Capabilities: Empower your shop team to perform advanced calibrations and major repairs, reducing reliance on expensive dealer service calls.
• Safety Assurance: Verify the integrity of all operator safety systems, including seat switches and braking mechanisms, to protect your crew.
• Instant Keyword Access: The digital PDF format allows for rapid searching of specific terms like "fault codes" or "valve timing" for immediate results.

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Frequently Asked Questions

Does this cover the pneumatic tire drive system?

Yes, as a Combination (AC) manual, it includes full service and repair data for the rear pneumatic tire axle and drive motors.

Are wiring diagrams included?

Yes, the manual contains clear, high-resolution wiring diagrams that allow for accurate tracing of electrical circuits and fault diagnosis.

Can I access this manual on my smartphone?

Absolutely. The PDF format is universally compatible with all mobile devices, allowing you to reference technical data directly at the machine.

How is the manual delivered?

You will receive an instant download link immediately after purchase, allowing you to save the PDF to any computer or tablet.