Bomag wrote this repair manual for the BMP 851 multi purpose compactor: factory publication 008 193 25, 272 pages in English. It covers the machine end to end: the control valve block with its solenoid and relief valves, tests and adjustments for the travel and vibration circuits, troubleshooting charts, vibrator unit repair, Danfoss hydraulic motor service, Ultra Hydraulics Powermax pump service, and a full repair section for the Hatz 2G 40 diesel.
When the machine dies at the edge of the cut and the crew is standing on a lift that still needs passes, the job usually stalls for want of one number: a nominal pressure, a coil current, a bearing procedure. The test and troubleshooting sections here give you that number instead of a guess.
Download the PDF, print the pages you need, and let them get dirty at the bench. The file stays clean on your laptop.
What's Inside This Bomag BMP 851 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety Regulations | 7-10 | General, Hydraulic System |
| General Notes on Repair | 11-12 | General, Electric System |
| Tightening Torques | 13 | Torques for Bolts with Metric Unified Threads |
| Control Valve Block Overview | 14-16 | Control Valve Block, Port Connections, Solenoid Valves, Relief Valves |
| Tests and Adjustments | 17-32 | Rotary Speeds, Travel Circuit Pressure, Vibration Circuit Pressure, Leak Oil Rate, Travel Motor Testing |
| Trouble Shooting Charts | 33-54 | Drive Power Issues, High Pressure Relief Valves, Vibration System Faults, Engine Speed, Shuttle Valve |
| Vibrator Unit Repair | 55-64 | Vibrator Unit Disassembly, Bearing Replacement, Shaft Removal, Assembly Procedures |
| Danfoss Hydraulic Motor Service | 65-96 | Omt Motor Dismantling, Tacho Connection, Gearwheel Set, Seal Replacement, Series 0 and 1 Specifications |
| Ultra Hydraulics Pump Service | 97-114 | Powermax Pump Maintenance, Tandem Unit Assembly, Priority Flow Dividers, Load Sensing Valves |
| Hatz Diesel Engine Repair | 115-263 | Technical Data and Type Plate, Engine Illustrations, Fuel Supply System, Airfilter and Exhaust Systems, Electrical Equipment and Engine Monitoring, Mechanical and Hydraulic Power Take-Off, Cross-Reference Lists, Cylinders and Pistons, Crankcase and Flywheel-Side Components, Test and Adjustment Work (Bumping and Tappet Clearance, Start of Injection, Injected-Fuel Quantity, Engine Speed), Governor and Injection Equipment, Special Tools and Sealants |
| Wiring Diagrams | 264-272 | Electrical Wiring Diagram, Relays, Alternator, Starter, Component Legend |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Valve clearance (inlet) | 0.1 mm | p. 20 |
| Valve clearance (outlet) | 0.1 mm | p. 20 |
| High pressure nominal value | 250 bar | p. 39 |
| Engine speed nominal value | 2800 rpm | p. 45 |
| Current consumption | 3A at 12V | p. 267 |
| Engine Rated Power (DIN ISO 9249) | 13.9 kW | p. 20 |
| Engine Rated Speed | 2800 min-1 | p. 20 |
| Travel Pump High Pressure Limitation | 250 bar | p. 20 |
| Vibration Pump High Pressure Limitation | 200 bar | p. 21 |
| Vibration Frequency | 32 Hz | p. 21 |
| Injection Pressure (static) | 250 bar | p. 120 |
| Tappet Clearance (inlet/outlet) | 0.10 mm | p. 120 |
Bomag BMP 851 Common Problems This Manual Covers
Machine loses drive power
Weak or one-sided travel on a closed-loop system can be the pump, a motor, or a relief valve, and swapping parts blind gets expensive. The troubleshooting charts step through drive power faults and high pressure relief valve checks so you condemn the right component.
Manual Section: Trouble Shooting Charts p. 33Vibration will not switch on
A dead vibration circuit often traces back to the solenoid valves on the control valve block rather than the exciter itself. The valve block overview maps the port connections, solenoid valves, and relief valves so you can test at the right point.
Manual Section: Control Valve Block Overview p. 14Noisy or seized vibrator unit
Growling from the drum under vibration usually means the exciter bearings are on the way out. The vibrator unit section covers disassembly, shaft removal, bearing replacement, and reassembly step by step.
Manual Section: Vibrator Unit Repair p. 55Drum drive motor leaking or weak
A tired Danfoss motor shows up as oil weeping at the drum and fading pull on grades. The manual walks through dismantling the OMT motor, the gearwheel set, and seal replacement, including Series 0 and 1 specifications.
Manual Section: Danfoss Hydraulic Motor Service p. 65Travel pump down on pressure
Worn pump internals bleed off the pressure the travel circuit needs before the relief valves ever open. The Ultra Hydraulics section covers Powermax pump maintenance, tandem unit assembly, priority flow dividers, and load sensing valves.
Manual Section: Ultra Hydraulics Pump Service p. 97Hatz engine hard to start
Fuel supply and air filter problems are the usual reasons the 2G 40 cranks without firing. The engine section covers the fuel supply system, air filter system, and full technical data through to crankshaft and camshaft work.
Manual Section: Hatz Diesel Engine Repair p. 115Pressures off after a repair
After changing a pump or motor the circuit has to be set back to nominal values, not left where it lands. The tests and adjustments section covers rotary speeds, travel and vibration circuit pressures, leak oil rate, and travel motor testing.
Manual Section: Tests and Adjustments p. 17Frequently Asked Questions
Which machine and engine does this manual cover?
It covers the Bomag BMP 851 multi purpose compactor with the Hatz 2G 40 diesel engine. The Hatz Diesel Engine Repair section alone runs from page 115 to page 263 of the 272-page book, with technical data, fuel system, crankshaft, camshaft, and alternator coverage; the wiring diagrams follow on pages 264-272. p. 115
Does it cover the hydraulic travel and vibration systems?
Yes. The Danfoss Hydraulic Motor Service section covers dismantling, the gearwheel set, and seal replacement, and the Ultra Hydraulics Pump Service section covers the Powermax pump, flow dividers, and load sensing valves. Troubleshooting charts and circuit pressure tests are included as well. p. 65
Are actual test values included, or just procedures?
Both. The Tests and Adjustments section gives nominal values to measure against, such as 250 bar high pressure limitation on the travel pump, 200 bar on the vibration pump, and 32 Hz vibration frequency, along with rotary speed and leak oil rate checks. p. 17
Is this a parts catalogue or an operator's manual?
Neither. This is the repair manual, Bomag publication 008 193 25, written for disassembly, testing, adjustment, and troubleshooting. It is the book you want for fixing the machine, not for looking up spare part numbers or daily operating instructions.
What do I get after purchasing this Bomag BMP 851 manual?
Instant PDF download. You get the full 272-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print just the pages I need from this Bomag BMP 851 manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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