What the DA-control valve on a BC 670 RB actually does when charge pressure drops is settled in this 256-page Bomag BC 670 RB Service Training PDF (OEM 008 098 42), the factory book for the Cummins-powered refuse compactor. Full wiring diagrams walk the electrical system sheet by sheet, from current supply and cold starting aid through the travel control circuit board, with a table of potentials for tracing faults with your meter. Hydraulic schematics map the closed-loop travel circuit, the oil flow amplifier and the dozer blade control, and troubleshooting tables close out the engine, travel and lubrication chapters. Set the charge pressure relief valve at 30 bar, confirm pilot pressure starts pump control at 6 bar, and torque the injection nozzle adjustment screws to 61 Nm. On a landfill cell at night there is nobody to call. Bookmarked and text-searchable, the PDF prints clean; the sheet you need can ride on the machine and take the grease.
What's Inside This Bomag BC 670 RB Manual
| System | Pages | Key Topics |
|---|---|---|
| Service Training | 1 | Bc 670 Rb, Serial Number Identification, Part Number |
| Documentation | 3 | Index of Related Bomag Publications (Each Sold Separately) |
| List of Components | 7 | Component Diagram, Component List, System Identification |
| Technical Specifications | 8-10 | Engine Specifications, Travel Pump Specifications, Travel Motor Specifications, Final Drives Specifications, Steering and Working Pump Specifications, Steering Valve Specifications |
| Diesel Engine | 11-41 | General, External Engine Parts, Turbo Charger, Fuel System, Lubrication Oil System, Coolant System, Air Intake System, Exhaust System |
| Hydraulic System | 42-94 | Travel System |
| Working Hydraulics | 95-114 | Axial Piston Pump, Oil Flow Amplifier, Priority Valve, Control Valve Block, Steering Valve, Dozer Blade Cylinder |
| Electrical System | 115-211 | Bc 670 Rb Electrical System, Checking the Voltage Potentials, Table of Potentials, How to Proceed in Case of an Electrical Fault, Electric Installation Box, Junction Box X41 |
| Lubrication System | 212-240 | Lubrication Pump, Main Distributor, Sub Distributor, Piston Detector, Pump Element, Safety Valve |
| Air Conditioning | 241-256 | Physical Principles, Boiling Point, Refrigerant Circuit, Temperature - Pressure Curve, Refrigerant Circuit Kad 9, Components, Electro Magnetic Clutch, Condenser |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Injection nozzle adjustment screw tightening torque (without torque wrench adapter) | 61 Nm | p. 33 |
| Injection nozzle adjustment screw tightening torque (with torque wrench adapter) | 47 Nm | p. 33 |
| Charge pressure relief valve setting | 30 bar | p. 52 |
| Pilot pressure at control start | 6 bar | p. 52 |
| Current consumption (Float position) | approx. 1A | p. 112 |
| Current consumption (Down) | approx. 3A | p. 112 |
| Engine Displacement (LTA-10-C325) | 10000 cm3 | p. 8 |
| Engine Displacement (MTA 11 - C 350) | 10800 cm3 | p. 8 |
| Travel Pump Displacement | 71 cm3/U | p. 8 |
| Travel Motor Displacement Range 1 | 70 cm3/U | p. 9 |
| Travel Motor Displacement Range 2 | 200 cm3/U | p. 9 |
| Intake Valve Clearance | 0.36 mm | p. 28 |
Bomag BC 670 RB Common Problems This Manual Covers
Bomag BC 670 RB loses drive power on the working face, travel sluggish or machine stops mid pass
Check charge pressure before pulling the travel pump. Tee a gauge into the charge circuit and verify the relief valve holds 30 bar (page 52); confirm pilot pressure rises from 6 bar at control start to 14 bar maximum. Low charge pressure points to a clogged filter or worn relief valve, not the pump.
Manual Section: Hydraulic System p. 52Engine hard to start, low power under load, heavy black smoke from the exhaust
Start with the engine troubleshooting procedures on page 35 before swapping parts. Replace the fuel filter and bleed the system, then check valve clearances: 0.36 mm intake, 0.69 mm exhaust (page 28). If the nozzles come out, torque the adjustment screw to 61 Nm on reassembly so the machine goes back to the cell running clean.
Manual Section: Diesel Engine p. 35Central lubrication warning on, grease pushing out of the safety valve, bearings running dry
Trace the blockage before condemning the lubrication pump. Grease venting at the safety valve means it has reached its 350 bar opening pressure (page 226), so a distributor or bearing line downstream is plugged. Disconnect the main distributor outlets one at a time until grease flows free, then clear or replace the blocked sub-distributor and line.
Manual Section: Lubrication System p. 226Dozer blade will not lift or drops slowly, control lever feels dead in one direction
Test the control lever button before dropping the valve block. Measure current draw at the solenoid: approx. 3A down and 1A in float (page 112). No current means a failed button or a broken wire in the lever; correct current with no blade movement sends you to the control valve block in the working hydraulics.
Manual Section: Working Hydraulics p. 112Frequently Asked Questions
What are the torque specifications for the injection nozzle adjustment screw nut?
The tightening torque for the injection nozzle adjustment screw nut is 61 Nm without a torque wrench adapter, or 47 Nm when using a torque wrench adapter. p. 27
What is the intake and exhaust valve clearance for the Cummins engine?
The intake valve clearance is 0.36 mm and the exhaust valve clearance is 0.69 mm. p. 28
What is the pressure setting for the pressure cut-off valve?
The pressure cut-off setting is 430 - 20 bar. p. 59
What is the operating time for the automatic central lubrication system?
The operating time for the central lubrication system is approximately 45 seconds per cycle. p. 213
What is the opening pressure for the safety valve in the lubrication system?
The safety valve in the central lubrication system opens at a pressure of 350 bar. p. 226
What do I get after purchasing this Bomag BC 670 RB manual?
You get a 256-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Bomag BC 670 RB manual print-friendly?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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