Bomag's service manual 008 915 20 takes the BW 174 AP AM and ACP AM tandem vibratory rollers apart on paper before you ever pull a cover: 974 pages of factory repair procedures, tests and adjustments, and Asphalt Manager diagnostics. This Bomag BW 174 AP AM, BW 174 ACP AM service manual PDF closes with hydraulic diagrams 870 206 09 and 870 203 12 plus wiring diagram 870 100 25, and its troubleshooting charts trace no vibration, machine does not drive, and hydraulic oil overheating faults through the closed-loop travel circuit. Drum repair fills a long chapter, from pulling the AP drum to rebuilding the Vario exciter on the AM side. Tee a 60 bar gauge into the brake releasing line before condemning a travel pump, and torque M5 10.9 hardware to 9 Nm on reassembly. A roller that quits mid-mat parks the whole paving train. Bookmarked and text-searchable, the PDF gets your roller back in the pass.
What's Inside This Bomag BW 174 AP AM, BW 174 ACP AM Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 7-30 | Introduction, Safety Regulations, General Repair Instructions |
| Technical Data | 31-38 | Engine Data, Travel Pump, Vibration Pump, Vibration Motor, Steering Valve, Drum Drive |
| Maintenance | 39-48 | Fuels and Lubricants, Table of Fuels and Lubricants, Running-In Instructions, Maintenance Table |
| Test and Adjustment Points | 49-60 | Overview Travel/Vibration Pump, Test and Adjustment Points Travel and Vibration Pumps |
| Tests and Adjustments | 61-92 | Special Tools, Activate Service Mode, Driving Against the Closed Brake, Turn the Steering Against an End Stop, Checking the Rotation Speeds, Pressure Tests in the Travel Circuit |
| Flushing and Bleeding | 93-122 | Special Tools for Flushing, Flushing - General, Flushing Schematic for Travel Circuits, Flashing the Travel Circuit, Bleeding the Travel Circuit |
| Trouble Shooting | 123-146 | Trouble Shooting Chart - Hydraulic Oil Overheating, Trouble Shooting Chart - Machine Travels with Travel Lever in "Neutral", Trouble Shooting Chart - Machine Does Not Drive |
| Electrics | 147-258 | Understanding Circuit Diagrams, Designation of Components in the Wiring Diagram, Terminal Designations in Wiring Diagram, Circuit Symbols in the Circuit Diagram |
| Electronic Controls | 259-402 | Machine, Asphalt Manager |
| Service Training | 403-506 | Esx Control, Travel System, Vibration System, Steering System, Exciter Unit, Asphalt Manager |
| Installing the Air Conditioning System | 507-534 | Heating-Ventilation Module, Compressor, Dryer, Condenser, Central Electrics, Wiring Loom |
| Air Conditioning System | 535-578 | Physical Basics, Refrigerant R134a, Compressor Oil / Refrigeration Oil, Working Principle of the Air Conditioning System, Monitoring Devices, Components |
| Engine | 579-602 | Features, Cooling System, Removing and Installing the Thermostat, Checking the Thermostat in Disassembled State, Fuel System, Turbo Charger System, Check the Engine Oil Level |
| Drum | 603-684 | Special Tools, Repair Overview AP-drum, Removing the AP-drum, Dismantling the AP-drum, Ad/Ap Disassembling, Assembling the Exciter Unit, Assembling the AP-drum |
| Pivot Steering | 685-696 | Repair Overview Oscillating Articulated Joint, Removing Repairing and Installing the Pivot Steering, Repairing the Oscillation Joint |
| Vibration Valve Y54/Y55 | 697-700 | Vibration Control Valve Repair Overview |
| Suppliers Documentation | 701-932 | Travel Pump, Vibration Pump, Vibration Motor, Drum Drive, Wheel Drive |
| Circuit Diagrams | 933-974 | Hydraulic Diagram 870 206 09, Hydraulic Diagram 870 203 12, Wiring Diagram 870 100 25 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tightening torque for M4 screw (8.8) | 3 Nm | p. 26 |
| Tightening torque for M4 screw (10.9) | 5 Nm | p. 26 |
| Pressure gauge for brake releasing line | 60 bar | p. 130 |
| Pressure gauge for charge pressure test | 60 bar | p. 130 |
| Melting time at 23 °C (1.5 times rated current) | 1 hour | p. 174 |
| Melting time at 23 °C (2.5 times rated current) | 1 minute | p. 174 |
| Fastening screw tightening torque | 0.6 Nm | p. 177 |
| Maximum amperage for proximity switches | 300 mA | p. 178 |
| Travel speed sensor switching distance | 0.3 to 1 mm | p. 235 |
| Input water level (only BW 154) valid range | 4 – 20 mA | p. 291 |
| Input water separation current (water separated) | 0.03 mA | p. 292 |
| Output voltage supply for additional analog evaluations nominal voltage | 5.0 V | p. 293 |
Bomag BW 174 AP AM, BW 174 ACP AM Common Problems This Manual Covers
Bomag BW 174 AP AM will not drive, brake fault 1004 stays active after startup
Check the troubleshooting chart starting on page 130 with a 60 bar gauge teed into the brake releasing line. Verify pilot brake pressure holds between 12 and 30 bar minimum to maximum (page 894). If pressure is good, inspect the brake valve connector and wiring for the overcurrent condition behind fault 1004 before replacing the valve.
Manual Section: Machine does not drive p. 130Travel drive drops into limp mode after an error, forward drive cuts out intermittently
Check the operator seat switch circuit first: test seat fuses F165 (15 A) and F166 (5 A) listed on page 962. Verify each joystick micro-switch clicks cleanly through full lever travel; replace any dead switch and torque its fastening screws to 0.6 Nm per page 177. Clear the stored fault and retest drive in both directions.
Manual Section: Electrics p. 177No vibration or exciter shafts run too slow at full throttle on both drums
Check engine speed first; vibration needs the full rated 2400 rpm (page 32) before the exciters reach their 45 Hz frequency. Verify vibrator shaft housing oil levels, 33.5 litres front and 40 litres rear per page 43. If the shafts still run slow, work through the troubleshooting procedures starting on page 125 and pressure-test the vibration circuit.
Manual Section: Exciter shaft speed too low p. 125Hydraulic oil temperature climbs past 90 degrees C during long compaction passes
Clean the hydraulic cooler fins; asphalt dust and spray-water film cake them fast on a paving job. Verify oil level and condition, the system holds 50 litres (page 43), and follow the overheating chart starting on page 125. Pressure-test the travel circuit for an internal leak dumping flow across relief if the temperature keeps climbing.
Manual Section: Hydraulic Oil Overheating p. 125Front steering sticky or completely dead while rear steering still works normally
Test pressure at the front steering valve; maximum steering pressure is 200 bar per page 37. Check the front steering angle sensor signal, which should read 4000 to 20000 mA across its range with actual angle sweeping -34.0 to +34.0 degrees (page 331). Clean the sensor connector and recheck before condemning the steering valve.
Manual Section: No front steering function p. 331Frequently Asked Questions
What do the error codes for the BOMAG BW 174 AP AM and BW 174 ACP AM mean?
The error codes are categorized by system. For example, codes 1000–1999 relate to the travel system, 2000–2499 to the steering system, and 5000–5499 to the diesel engine. Detailed descriptions of these fault codes and their reactions can be found in the 'Description of fault codes on the ESX control' section starting on page 299. p. 299
What are the torque specifications for M12 bolts with a 10.9 strength class?
For screws with a metric unified thread and a 10.9 strength class, the tightening torque for an M12 bolt is 123 Nm. p. 26
What is the correct valve clearance for the engine?
The valve clearance for both intake and exhaust valves on the engine is 0.23 to 0.27 mm, measured on a cold engine. p. 36
How often should the engine oil and oil filter be changed?
The engine oil and oil filter cartridge should be changed every 500 operating hours. p. 45
What is the correct tightening torque for the drum drive gear?
The fastening screws for the drum drive gear should be tightened to 300 Nm. p. 634
Will this Bomag BW 174 AP AM Service Manual download right away?
A 974-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Are there any print restrictions on this Bomag BW 174 AP AM manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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