When a BW 174 loses charge pressure mid-lift, the repair runs through the A4VG or A10VG travel pump itself, and this 376-page Bomag BW 174 AD, BW 174 AC repair manual PDF (OEM 008 912 33) covers that rebuild and everything else on the tandem vibratory roller. Supplier rebuild sections for the travel pumps, the A4FM28 unit and the MK 08 and MS/MSE drum drive motors take up well over half the book, each one ending at a serviceable rotary group or a freed brake piston. Flushing schematics map the routing for cleaning out the travel and vibration circuits, and a troubleshooting diagram traces each symptom you're chasing back to a test point. Set vibration starting pressure to 400 ±10 bar and preload the oscillation joint covers to 90 Nm. The roller quits mid-shift and there's nobody to call. This PDF answers instead: bookmarked by section, with a real text layer, open to the right spec before your next pass.
Complete the set for your BW 174 AD, BW 174 AC
What's Inside This Repair Manual
| System | Pages | Key Topics |
|---|
| General | 5-14 | Safety Regulations, General Repair Instructions |
| Tests and Adjustments | 15-54 | Technical Data, Special Tools, Checking the Rotation Speeds, Pressure Tests in the Travel Circuit, Checking / Adjusting the Neutral Positions of the Travel Pump |
| Flushing | 55-78 | Special Tool, Flushing Schematic for Travel System, Flashing the Travel Circuit, Flushing Schematic for Vibration Drive on AD-machines |
| Trouble Shooting | 79-100 | Trouble Shooting Diagram |
| Drum | 101-128 | Special Tools, Repair Overview for Drum, Removing and Installing the Drum, Dismantling, Assembling the Drum, Assembling the Exciter Shaft |
| Pivot Steering | 129-138 | Removing and Installing the Pivot Steering, Repairing the Oscillation Joint |
| Mk 08 | 141-202 | Brake Piston O-Ring, Sealing Ring, Cylinder-Block Cam Assembly, Sensor |
| MS/MSE 02 to 18 | 203-252 | Motor, Mechanical Brake Release, Brake Piston Seal, Bearing Support, Brake Shoes, Cam Ring |
| A4VG | 253-298 | Drive Shaft, Boost Pump, Control Piston Cover, Pressure Cut-Off Valve, Rotary Group, Positioning Piston |
| A10VG | 299-352 | Sectional View, Seal Kits and Sub-Assemblies, Sealing the Pressure Cut-Off, Control Units (Hd-Ep Old and New, Hd, Ep), Pump Disassembly, Assembly Tightening Torques, Mechanical and Hydraulic Zero Position Adjustment |
| A4FM 28 | 353-376 | Drive Shaft, Port Block, Rotary Group, Control Plate, Cylinder Block |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| All Models |
| Vibration pump Max. displacement | 45 cm3/rev. | p. 18 |
| Vibration pump Start-up pressure (pressure override) | 380 ±20 bar | p. 18 |
| Preload torque for oscillation joint covers | 90 Nm | p. 137 |
| Rated power ISO 9249 | 58 kW | p. 16 |
| Nominal speed | 2600 rpm | p. 16 |
| High pressure (pressure override) | 400 bar | p. 17 |
| Charge pressure | 26 bar | p. 17 |
| Max. leak oil rate (drum drive motors) | 1.5 l/min | p. 17 |
| Max. steering pressure | 200 bar | p. 17 |
| Fuel (diesel) capacity | 130 l | p. 18 |
| BW 174 AD |
| Operating weight (Cece) with ROPS-cabin, BW 174 AD | 9000 kg | p. 16 |
| BW 174 AC |
| Operating weight (Cece) with ROPS-cabin, BW 174 AC | 8600 kg | p. 16 |
