This is the Bomag factory Service Manual for the BC 672 RB-4, BC 772 RB-4, BC 772 RS-4 and BC 772 EB-4 refuse compactors, OEM publication 008 925 84, delivered as an 1100 page English PDF download. It applies to machines from serial numbers 101 570 04 1001, 101 570 02 1001, 101 570 03 1001 and 101 570 94 1001.
A landfill compactor that parks mid-shift leaves the cell open and the trucks queuing, and most of those stoppages trace back to the travel drive, the engine or the wiring. This is the workshop book for that work, written for the mechanic doing the testing and repair rather than the operator in the seat.
The file carries 448 bookmarks, so you can jump straight to the system you are chasing, and every page prints clean, so the sheets you need can go to the bench and get dirty.
What's Inside This Bomag BC 672 RB-4, BC 772 RB-4, BC 772 RS-4, BC 772 EB-4 Manual
| System | Pages | Key Topics |
|---|---|---|
| Front Matter and Table of Contents | 1-8 | Cover with All Four Models and Their Serial-Number Starts, Catalogue Number 008 925 84, Full Table of Contents |
| General | 9-72 | Dozer Blade, Bucket, Hydraulic System, Engine, Battery, Air Conditioning, ROPS |
| Technical Data | 73-102 | Engine, Transfer Case, Travel Pump, Travel Motors, Wheel Drive, Steering/Working Pump, Fan Pump, Fan Motor |
| Overview of Machine | 103-122 | Refuse Compactor, Soil Compactor, Electric Systems, Hydraulic System, Diesel Engine, Air Conditioning, Central Lubrication System |
| Electric Systems | 123-314 | Test Lamp, Multimeter, Clip-On Measuring Instrument, Magnet Tester, Solenoid Valves, Magnetic Coils, Deutsch Plug, Telemecanique Switch |
| Hydraulic System | 315-410 | Travel Pump, Fan Pump, Steering and Working Pump, Travel Motor, Control Valve Block, External Gear Pumps |
| Machine Assemblies | 411-574 | Diesel Engine; Oscillating Articulated Joint; Compactor Wheels and Dozer Blade; Central Lubrication System; Automatic Air Conditioning; Auxiliary Heating, Airtronic |
| Troubleshooting | 575-712 | Preliminary Remarks; Emergency Procedures; Troubleshooting, Electrical Systems; Trouble Shooting, Diesel Engine; Trouble Shooting, Hydraulics; Troubleshooting, Air Conditioning System |
| Special Tools | 713-718 | Electrics; Special Tools for Hydraulic System; Special Tools, Tests and Adjustments |
| Measures Prior to Extended Shutdown Period | 719-724 | Machine, Water Separator, Fuel Tank, Engine Oil, Oil Filter, AdBlue/DEF Tank, Battery, Fuel Filter |
| Index | 725-736 | Alphabetical Index of the Whole Manual |
| Appendix - Circuit Diagram 247 | 737-797 | Wiring Drawing 247 for BC 672-772 -4 Tier 4f: 55 Sheets Plus Contents, Terminal-Strip and Plug/Pin Overviews; Verified Sheet 18 'Accelerator Pedal, Brake, Override System' |
| Appendix - Circuit Diagram 274 | 798-855 | CAN-Bus, Ignition Switch, Motor Control Module, Aftertreatment Control Module, Accelerator Pedal, Wheel Motors, Central Lubrication System, Steering |
| Appendix - Circuit Diagram 279 | 856-912 | Engine Controller, Aftertreatment Control Module, Common Powertrain Controller, Reversible Fan, Wheel Motors, Central Lubrication System, Steering, Blade and Shovel Functions |
| Appendix - Circuit Diagram 332 | 913-970 | CAN-Bus, Motor Control Module, Aftertreatment Control Module, Common Powertrain Controller, Wheel Motors, Central Lubrication System, Tachograph, Steering |
| Appendix - Circuit Diagram 402 (First Variant) | 971-1029 | Ignition Switch, Fuses, Motor Control Module, Aftertreatment Control Module, Common Powertrain Controller, Wheel Motors, Central Lubrication System, Tachograph |
| Appendix - Circuit Diagram 402 (Second Variant) | 1030-1092 | Wiring Drawing 402, Second Variant: Full Sheet Set with Its Own Contents and Component Overviews |
| Appendix - Hydraulic Diagram BC 772 Rb-4, 571 908 23 | 1093-1095 | Hydraulic Schematic in Two Sheets: the Circuit Drawing and Its Numbered Legend of Pumps, Motors, Valves and Pressure Settings |
| Appendix - Hydraulic Diagram BC 772 Rs-4, 571 908 25 | 1096-1100 | Hydraulic Diagram, Power Valve, Steering Cylinder, Lift Cylinder, Return Filter, Charge Pump, Travel Motor |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine | Mercedes Benz/MTU OM 471 LA, 6 cylinders, fluid-cooled | p. 75 |
| Rated power | 340 kW (ISO 9249) / 456 hp (SAE J 1349) | p. 75 |
| Rated speed / displacement | 1700 rpm / 12800 cm³ | p. 90 |
| Operating weight (CECE), BC 672 RB-4 | 32600 kg (71871 lbs) | p. 75 |
| Max. operating weight, BC 672 RB-4 | 33200 kg (73193 lbs) | p. 75 |
| Maximum pushing power, BC 672 RB-4 | 346 kN (77784 lbf) | p. 75 |
| Travel speeds | 0-4 / 0-7.5 / 0-12 km/h (0-2.5 / 0-4.7 / 0-7.4 mph) | p. 75 |
| Travel pump high pressure limitation | 450 bar (differential) | p. 90 |
| Travel pump pressure override | 430 bar (absolute) | p. 90 |
| Travel pump charge pressure | 25 bar | p. 90 |
| Travel motors | 4 off, 170 / 60 cm³/rev, pressure control 250 bar | p. 91 |
| Max. dozer blade pressure | 230 + 10 bar | p. 91 |
| Max. steering pressure | 200 + 10 bar | p. 91 |
| Dozer blade capacity (SAE J 1265) | 11.6 m³ (410 ft³) | p. 77 |
| Fuel capacity | 500 l (132 gal us) | p. 77 |
| AdBlue®/DEF capacity | 95 l (25 gal us) | p. 101 |
| Hydraulic system capacity | 350 l (92.5 gal us) | p. 101 |
| Air conditioning refrigerant | R134a, 1850 g (4.1 lbs) | p. 101 |
| Filters | charge circuit 12 micron, return flow 80 micron | p. 92 |
| Compactor wheels | 1350/1125 mm (53.1/44.3 in), Ø 1660 mm (65.4 in), 60/50 teeth | p. 76 |
Bomag BC 672 RB-4, BC 772 RB-4, BC 772 RS-4, BC 772 EB-4 Common Problems This Manual Covers
No drive or sluggish travel
A machine that crawls up the working face and stalls usually has a travel circuit fault: low charge pressure, a worn travel pump or a failing wheel motor. Work through the drive circuit tests before you condemn expensive components.
Manual Section: Travel driveWire wrap destroying wheel seals
Wire, strapping and cable wind in behind the wheels, chew through seals and overheat the drive. Worn scraper bars make it worse. The repair means pulling the wheel and rebuilding the sealing, and the drive coverage shows the teardown sequence.
Manual Section: Travel driveSteering heavy or jerky
Slow or lumpy response at the articulated joint points to the steering hydraulics or wear in the joint itself. On a fill slope that is a safety issue, not an annoyance, so test and adjust the steering circuit before it gets worse.
Manual Section: SteeringEngine overheating in debris
Refuse cells throw plastic film and dust straight into the cooling package, and a blocked radiator will shut the machine down by mid-shift. The engine coverage helps you separate a dirty cooler from a genuine cooling system fault.
Manual Section: EngineHydraulic oil running hot
Overheated or contaminated oil takes pumps and motors with it. Pressure checks against the correct test points tell you whether the heat is coming from a worn component or a relief valve working overtime.
Manual Section: Hydraulic systemNo start and intermittent electrical faults
Vibration and a corrosive landfill atmosphere are hard on connectors, relays and grounds. Chasing an intermittent fault without the wiring documentation wastes a shift; with it you can test circuit by circuit instead of swapping parts.
Manual Section: ElectricsFrequently Asked Questions
Which machines does this manual cover?
The Bomag BC 672 RB-4, BC 772 RB-4, BC 772 RS-4 and BC 772 EB-4 refuse compactors, from serial numbers 101 570 04 1001, 101 570 02 1001, 101 570 03 1001 and 101 570 94 1001 respectively. If your serial number falls in these ranges, this is your book.
Is this an operator's handbook or a repair manual?
It is the factory Service Manual, OEM publication 008 925 84, written for mechanics performing testing, adjustment and repair. At 1100 pages it goes well beyond daily operation and maintenance.
Can I diagnose a travel drive problem with it?
Yes. As the service manual for these compactors it covers the drive system, so loss of travel, weak climbing power and wheel motor faults can be worked through methodically instead of by parts swapping.
What engine and power does the Bomag BC 672 RB-4, BC 772 RB-4, BC 772 RS-4 and BC 772 EB-4 use?
All four models share a Mercedes Benz/MTU OM 471 LA, a 6-cylinder, fluid-cooled diesel rated at 340 kW (ISO 9249) / 456 hp (SAE J 1349), per page 75 of the manual. Rated speed is 1700 rpm at a 12800 cm³ displacement, per page 90.
What are the fuel and AdBlue tank capacities on the Bomag BC 672 RB-4, BC 772 RB-4, BC 772 RS-4 and BC 772 EB-4?
The fuel tank holds 500 l (132 gal us), per page 77 of the manual. The AdBlue/DEF tank is separate at 95 l (25 gal us), per page 101, so don't top off the wrong one at fill-up.
What is the operating weight of the Bomag BC 672 RB-4?
CECE operating weight is 32600 kg (71871 lbs), rising to a maximum of 33200 kg (73193 lbs) with attachments, per page 75 of the manual. Keep both figures handy when you're checking transport limits or wheel loading on this compactor.
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