Bomag BW 120 AD-4 Roller Pdf Repair Service Manual 00891052

Complete Workshop Manual for Bomag BW 120 AD-4 Tandem Vibratory Rollers

The Bomag BW 120 AD-4 Tandem Vibratory Roller PDF Repair & Service Manual (P/N: 00891052) is a professional factory-level technical guide for maintaining, diagnosing, and overhauling this Dash-4 series asphalt compactor. Featuring a 1200mm drum width, the BW 120 AD-4 is a staple in the paving industry, and this manual provides the OEM-approved procedures required to keep the machine operating at peak compaction performance.

Powered by a reliable liquid-cooled diesel engine, the BW 120 AD-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, steering articulation, and braking systems.

This manual is commonly used by field technicians, independent repair shops, and fleet maintenance teams working on Dash-4 Bomag tandem rollers in real-world jobsite conditions.

Technical Specifications & Maintenance Data

• Engine Service: Step-by-step engine service procedures, including valve clearance adjustments, fuel injection timing, cooling system inspection, and glow plug circuit testing.
• Hydraulic Systems: Accurate pressure settings and calibration procedures for hydrostatic travel motors and pump swashplate adjustment.
• Fluid Capacities & Specifications: Correct engine oil viscosity, hydraulic oil grades, and cooling system capacity data.
• Torque Values: Factory torque specifications for rubber buffer mounts, articulation pins, drum drive motors, and critical fasteners.

Systems & Service Coverage

• Dual Vibration System: Complete disassembly and reassembly procedures for front and rear exciter shafts, bearing replacement, and vibration frequency testing.
• Hydrostatic Drive: Diagnostic workflows for loss of drive power, travel motor rebuilding, and hydraulic system flushing after contamination.
• Electrical System: High-resolution wiring diagrams covering Dash-4 electrical logic, switches, sensors, fuses, and dashboard components.
• Water Spray System: Service instructions for the pressurized interval sprinkler system, including pump repair and nozzle cleaning to prevent asphalt pickup.
• Steering & Articulation: Procedures for resealing steering cylinders, inspecting articulation joints, and servicing pivot bearings.
• Brake System: Testing and servicing of SAHR parking brakes, emergency stop circuits, and brake release systems.

Manual Specifications

• Machine Model: Bomag BW 120 AD-4 Tandem Roller
• Part Number: 00891052
• Generation: Dash-4 Series
• Format: PDF Digital Download (fully searchable and bookmarked)
• Language: English
• Total Pages: 720+
• File Size: Approximately 108 MB
• Illustrations: Hydraulic flow diagrams, wiring diagrams, and exploded assembly views
• Compatibility: Windows, macOS, Android, iOS, and tablets

Why This Service Manual Is Essential for Repairs

• Accurate Troubleshooting: Quickly identify causes of vibration engagement failures, steering delays, and hydraulic pressure loss.
• Reduced Downtime: Perform in-house diagnostics and repairs without relying on expensive dealer service calls.
• Safety Compliance: Verify correct operation of seat safety switches, emergency braking systems, and operator safety circuits.
• Instant Access: Digital PDF format allows fast keyword searching for terms such as fault codes, wiring, or fuse locations.

Why Buy from Manualskart.com

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Frequently Asked Questions

Does this manual cover the engine?

Yes, the manual includes a dedicated diesel engine section covering fuel injection systems, cooling components, and water pump servicing.

Are wiring diagrams included?

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

Is this manual for the double steel drum (AD) model?

Yes, this manual is specifically written for the Bomag BW 120 AD-4 model equipped with vibratory steel drums on both the front and rear.

How will I receive the manual?

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