Bomag Bmp851 - Service Manual For
A common BMP851 failure is belt slippage. The manual shows how to check the belt deflection (usually 10-12 mm under thumb pressure) and how to replace the clutch shoes without damaging the crankshaft keyway.
Buy this manual if:
Do not rely on this manual if:
Better alternative: Purchase the Bomag Service Information System (SIS) CD-ROM which includes an interactive search and color diagrams, or buy a Hatz engine manual separately to cover what Bomag omits.
The Bomag BMP 851
is a 1.5-ton multi-purpose compactor designed specifically for earthwork in confined spaces like trenches and backfills. To maintain its performance and safety, owners rely on the service and operating manuals, which cover everything from routine fluid checks to complex hydraulic troubleshooting. Core Service Manual Components
The official Service Training Manual is the primary resource for technicians, containing deep-dive technical data and adjustment values.
Engine Systems: Covers the air-cooled, two-cylinder Hatz 2G40 diesel engine, including injection pump adjustments and valve clearances.
Hydraulic & Vibration: Detailed diagrams of the hydrostatic drive and the double vibration system (32 Hz frequency).
Electrical Schematics: Wiring diagrams for the dual-function cabled/radio remote control and safety systems like the roll-over sensor.
Maintenance Schedules: Precise intervals for changing oils, filters, and checking the V-belt. Key Technical Specifications Specification Engine Hatz 2G40 Air-cooled Diesel Operating Weight ~1,548 kg (1.54 tons) Working Width 610 mm or 850 mm (with extensions) Centrifugal Force 80 kN (approx. 18,000 lbs) Travel Speed Up to 2.7 km/h Gradeability 55% (without vibration) / 45% (with vibration) Maintenance & Troubleshooting Essentials The
features an "Easy Service Concept" with swing-up covers that expose 90% of all components. BOMAG BMP 851 Compactor Overview | PDF | Engines - Scribd
BOMAG BMP 851 Compactor Overview. This document provides specifications for the BMP 851 compacting machine. It can compact gravel, Scribd Multi-Purpose Compactor BMP851 - Cloudfront.net
The shop floor at Velasquez Heavy Equipment stank of diesel, old coffee, and defeat. The BMP851, a walk-behind vibratory roller the size of a small bull, sat dead in the middle of the bay. Its drum was cold. Its engine was silent. And its operator, a veteran named Cruz, was staring at it like it had personally betrayed him.
“She just... stopped,” Cruz said, kicking a tire. “Mid-roll. Like she forgot how to live.”
Marisol, the shop’s lead mechanic, wiped her hands on a rag that was more grease than cloth. She had been a diesel specialist for twelve years. She had rebuilt transmissions blindfolded. But the BMP851 was a different kind of animal. It was a German machine. Precise. Vengeful. And it had no soul—only sensors.
“You check the hydrostatic drive relief valve?” she asked.
Cruz blinked. “The what?”
Marisol sighed. She walked to her toolbox, unzipped the heavy plastic sleeve, and pulled out the only thing that might save them: the Service Manual for Bomag BMP851.
It wasn’t just a manual. It was a three-inch-thick brick of spiral-bound dread. The cover was smeared with hydraulic fluid and what looked like a decade of bad decisions. The spine was held together with duct tape and hope. Inside, every page was a maze of exploded diagrams, torque specifications in Newton-meters, and warnings in three languages: English, German, and Danger.
She flipped to Section 7: Vibration System Troubleshooting. Cruz leaned over her shoulder.
“You know,” he said, “the last guy who tried to fix one of these said the manual was written by engineers who hate mechanics.”
“Engineers don’t hate mechanics,” Marisol said without looking up. “They just think we’re psychic.”
The symptom was clear: no vibration. The drum would roll, but it wouldn’t compact. For a BMP851, that was like a guitar with no strings. Useless.
The manual offered a flowchart. Step 1: Check the eccentric weight oil level. Step 2: Inspect the vibration motor coupling. Step 3: Sacrifice a goat to the god of German hydraulics.
“It says here,” Marisol muttered, tracing a line with her finger, “that if the pressure at port M3 drops below 210 bar, the proportional solenoid valve de-energizes and locks the vibration circuit.”
Cruz stared at her. “You just made up half those words.”
She ignored him. She crawled under the machine with a pressure gauge and a flashlight. The belly of the BMP851 was a cathedral of hoses and cast iron. She found port M3 tucked behind a guard plate that required a Torx T-45, because of course it did.
The pressure read 0 bar.
“There’s your ghost,” she said from underneath.
She worked through the manual’s gospel. Page 4-23: Pump displacement control. Page 4-24: Solenoid coil resistance test. Page 4-25: Do not use impact tools on the manifold block unless you enjoy weeping.
Two hours later, she found it: a tiny piece of metallic debris lodged in the pilot valve seat. Smaller than a grain of rice. Big enough to kill a $45,000 roller.
She cleaned the seat, reassembled the valve, and torqued every fitting to the exact specification listed in the manual’s appendix: 38 Nm for M14 hydraulic ports. No more. No less.
When she fired up the BMP851, the engine caught like it had been waiting for permission. She engaged the vibration. The drum hummed to life—a deep, gut-level thrum that shook dust from the rafters.
Cruz grinned. “You fixed her.”
Marisol closed the manual and set it gently on her bench. The duct-taped spine seemed to sigh in relief.
“No,” she said, wiping her hands. “The manual fixed her. I just translated.”
From that day on, the BMP851 ran without a single vibration fault. And every time Marisol passed the roller, she’d pat its dirty fender and whisper: Danke schön.
BOMAG BMP 851 Go to product viewer dialog for this item. is a multi-purpose trench roller commonly used for compacting gravel, sand, mixed soil, and clay. A comprehensive service training manual for the
covers maintenance procedures, troubleshooting, and technical specs, often available for digital download. Technical Data & Specifications Operating Weight: ~1,548 kg (3,413 lbs). Engine: Diesel (typically a Kubota engine). Steering: Skid steering via articulations. Vibration: Centrifugal force with automatic/manual options. Control: Remote control (cable or radio). Key Maintenance Tasks
Engine Oil & Filter: Regularly check and change to maintain optimal performance.
Air Cleaner: Inspect, clean, or replace the filter element depending on site conditions.
Hydraulic System: Monitor hydraulic oil level and replace filters as per the hourly schedule.
Drum Drives: Inspect and lubricate all articulation and drive components.
Battery: Check connections and voltage to ensure reliable remote control operation.
Vibration System: Ensure the eccentric housing is properly lubricated. Service & Troubleshooting Topics
The service manual covers procedures for identifying and repairing issues with:
Travel System: Troubleshooting drive motor or transmission issues.
Electrical System: Interpreting wiring diagrams and remote control connections.
Hydraulics: Diagnosing pressure issues in the travel or vibration circuits. Accessing the Full Manual Because the
uses a specific serial number for technical variations, you can find the exact manual by searching for your 12-digit serial number on the BOMAG website. Common sources for the PDF manuals include: Scribd (BMP 851 Service Training) DIY Repair Manuals Etsy (Workshop service manual PDFs) To help you further, Fluid capacities or part numbers? A wiring diagram for the remote control? Let me know which section you
BMP 851 Service Training Manual | PDF | Valve | Pump - Scribd service manual for bomag bmp851
BOMAG BMP 851 service documentation is typically divided into three primary types of manuals: Service Training/Workshop Operating & Maintenance
. These manuals are essential for performing professional repairs, troubleshooting, and routine upkeep on this multi-purpose trench compactor. 1. Service Training & Workshop Manual
This manual is specifically designed for service engineers and technicians to handle complex technical repairs. Technical Data
: Includes detailed adjustment values and measurements for the machine. System Overviews : In-depth sections covering the diesel engine travel system (hydrostatic drive), vibration system electrical systems Repair Procedures
: Instructions for dismantling and removing major components like drums, exciter units, hubs, and motors. Troubleshooting
: Professional-level diagnostics for identifying system failures. 2. Operating & Maintenance Manual
This manual is the primary resource for daily operators and on-site maintenance personnel. Complete Hire Safety Protocols : Comprehensive safety regulations for machine operation. Machine Controls
: Identification and function of all indicators and controls, including the dual-function cabled/radio remote control system. Scheduled Maintenance
: Intervals and procedures for checking engine oil, hydraulic oil, fuel levels, and coolant. Minor Adjustments
: Guide for tasks like tensioning V-belts, cleaning cooling fins, and adjusting scrapers. d3is8fue1tbsks.cloudfront.net 3. Parts Manual
BMP 851 Service Training Manual | PDF | Valve | Pump - Scribd
As of 2025, the best sources for the service manual for Bomag BMP851 include:
Bomag offers digital and printed manuals via their global parts and service portal. You will need your machine’s serial number (found on the data plate). Cost typically ranges from $80 to $250 USD depending on format.
Storage (over 30 days):
Recommissioning:
Every service manual includes an exploded parts diagram with genuine Bomag part numbers. This ensures you order the correct hydraulic pump seal, exciter bearing, or throttle cable the first time.
Before turning a wrench, the manual guides you to locate the machine’s serial number plate. It lists: A common BMP851 failure is belt slippage