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.
What's Inside This Bomag BW 174 AD, BW 174 AC 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 |
Bomag BW 174 AD, BW 174 AC Common Problems This Manual Covers
Bomag BW 174 no vibration or weak amplitude on either drum, exciter will not start
Check charge pressure in the vibration circuit first; it must hold 26 ±1 bar per the test procedure on page 30. Then measure starting pressure when you switch vibration on: spec is 400 ±10 bar, settling to roughly 80 to 100 bar operating on soil. Low starting pressure points to a worn vibration pump or relief valve.
Manual Section: Pressure measurements in the vibration circuit p. 30Machine does not drive, creeps in neutral, or travel is sluggish in one direction
Test charge pressure in the travel circuit; below 26 bar the closed-loop travel pump cannot stroke correctly. Compare high pressure against the 400 bar override setting, then check and adjust the mechanical and hydraulic neutral positions of the travel pump using the procedures in the Tests and Adjustments section starting on page 15. Work the troubleshooting diagram on page 81 to split pump faults from drum drive motor faults.
Manual Section: Trouble shooting diagram p. 81Engine runs but travel lever is dead, seat sensor interlock warning stays active
Check fuse F63 and the seat switch connector before condemning any hydraulics; cycle the seat switch and listen for the interlock relay. If the electrics test good and travel is still dead, verify charge pressure holds 26 bar and follow the no-drive branch of the troubleshooting diagram on page 81 step by step.
Manual Section: Trouble shooting diagram p. 81Hydraulic oil overheating after an hour of rolling, drive power fades when hot
Check hydraulic oil level first; the tank holds 50 l, and a starved charge circuit aerates and heats fast. Clean the cooler fins, then verify charge pressure still reads 26 bar with the oil hot. After any pump failure or contamination, flush the travel circuit using the service procedure on page 60 before running new components.
Manual Section: Flushing p. 60Steering stiff or drums running out of track, clunking from the articulated joint
Test front and rear steering circuit pressure; maximum steering pressure is 200 bar per the spec on page 17. If pressures check good, inspect the oscillation joint for play and retorque the joint covers to the 90 Nm preload listed on page 137. Pivot steering removal and repair procedures start on page 129, so you can get back in the pass the same shift.
Manual Section: Pivot Steering p. 129Frequently Asked Questions
How do I delete stored faults on the BOMAG BW 174?
To delete stored faults, ensure the engine is not running. Enter code number 710 on the display module, which will clear all stored faults. p. 54
What is the tightening torque for M16 screws with a strength class of 10.9?
For screws with a metric unified thread and a strength class of 10.9, the tightening torque for an M16 screw is 300 Nm (221 ft-lb). p. 11
What is the nominal high idle speed for the engine on the BW 174 AD/AC?
The nominal high idle speed for the engine on both the BW 174 AD and BW 174 AC models is 2775 ±75 rpm. p. 17
What is the maximum permissible leak oil rate for the vibration motor?
The maximum permissible leak oil rate for the vibration motor is 1.5 litre/min. p. 17
What is the procedure for checking the front steering pressure?
To check the front steering pressure, enter code 600 on the display module to actuate the steering against the mechanical stop. Connect a 600 bar pressure gauge to the steering pressure test port and run the engine at idle speed; the nominal value is approximately 200 ±10 bar. p. 35
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