An hour from now you could be at the pressure test bar with this Bomag MPH 122-2 service manual PDF open on the screen: 658 factory pages for the soil stabilizer and asphalt recycler, OEM 008 917 87. Circuit diagrams close the book, from hydraulic diagram 593 301 24 through the machine wiring to separate electric, hydraulic, pneumatic and heating schematics for the bitumen metering system. Fault tracing on the Deutz TCD 2015 V6 runs from flashing codes through SERDIA and CAN-bus diagnostics to the full EMR3 fault code list, and the A4VG56 travel pump and A4VG180 rotor pump each get their own troubleshooting sections. Crank the starter one minute at most, then let it cool 30 minutes; never heat oils past 160 degrees C. Misdiagnose a rotor pump and you pay for the rebuild twice. Pay once here, and a bookmarked, text-searchable copy stays with your machine for good.
What's Inside This Bomag MPH 122-2 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 7-30 | Introduction, Safety Regulations, General Repair Instructions |
| Bomag Stabilizer / Recycler | 31-36 | Universal Rotor, Rotor Speed, Cutting Chisels, Cross-Slope, Rotor Hood Side Plates, All-Wheel Drive |
| Technical Data | 37-42 | Operating Weight, Track Radius, Travel Speed, Engine Type, Tire Size, Filling Capacities |
| Maintenance | 43-56 | Fuels and Lubricants, Table of Fuels and Lubricants, Running-In Instructions, Maintenance Table |
| E-Plan Wiring Diagrams | 57-72 | Understanding Wiring Diagrams, Circuit Symbols in the Circuit Diagram, Identification of Switch Blocks in the Wiring Diagram |
| Electrics | 73-120 | Designation of Components in the Wiring Diagram, Terminal Designations in Wiring Diagram, Batteries, Battery Service, Checking the Main Battery Switch, Starting with Jump Wires |
| Electronic Control | 121-200 | Training |
| Engine Electrics | 201-326 | Engine Control Unit |
| Engine | 327-378 | Diesel Engine, Engine Description Tcd 2015 V 6 Cylinder, Lubrication Oil Circuit Tcd 2015, Coolant Circuit Tcd 2015, Fuel Circuit Tcd 2015, Injection System Tcd 2015 |
| Air Conditioning System | 379-422 | Physical Basics, Refrigerant R134a, Compressor Oil / Refrigeration Oil, Working Principle of the Air Conditioning System, Monitoring Devices, Components |
| Hydraulics | 423-500 | Hydraulic Circuit, List of Components, Pumps on Diesel Engine, Pressure Test Bar, Travel Pump A4VG56 Ep, Rotor Pump, A4VG180 Ep, Axial Piston Swash Plate Principle |
| Water Injection | 501-516 | Water Dosing System, Water Dosing System Nozzle Change, Water Sprinkler System, Maintenance in the Event of Frost |
| Bitumen Dosing System | 517-548 | Control Elements |
| Circuit Diagrams | 549-658 | Hydraulic Diagram 593 301 24, Wiring Diagram 42, Bitumen Metering System Electrics, Bitumen Metering System Hydraulics, Bitumen Metering System Pneumatics |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Maximum temperature for heating oils | 160 °C | p. 13 |
| Starter operation time | 1 minute | p. 16 |
| Tightening torque for M4 (8.8) | 3 Nm | p. 26 |
| Tightening torque for M4 (10.9) | 5 Nm | p. 26 |
| Main relay switch-off delay | 10 seconds | p. 202 |
| Footpedal (setpoint) 1 output voltage | 5 V | p. 204 |
| Oil pressure sensor tightening torque | 20 Nm | p. 295 |
| Tightening torque for coolant temperature sensor | 22±2 Nm | p. 302 |
| Maximum air pressure for blowing out cooling air channels | 5 bar | p. 351 |
| Maximum air pressure for blowing out filter cartridge | 5 bar | p. 351 |
| Rotor rotary speed (Stage 1) | 125 rpm | p. 466 |
| Rotor rotary speed (Stage 11) | 185 rpm | p. 466 |
Bomag MPH 122-2 Common Problems This Manual Covers
Bomag MPH 122-2 shuts down randomly during stabilizing passes, intermittent electrical fault, sometimes won't restart
Check wiring and plug connections before condemning the control unit; most of these faults are loose or corroded connectors, not electronics. Work through the wiring diagram starting, wiggle-testing harness plugs with the fault present. Verify battery open-circuit voltage reads 12.6 V fully charged per page 80, and confirm the main battery switch contacts are clean.
Manual Section: Electrics p. 80Starter just clicks or cranks slowly, engine won't turn over on cold mornings
Measure battery open-circuit voltage first: 12.6 V means fully charged, anything at 12.25 V or below needs recharging before you go further. Check electrolyte density, 1.285 kg/dm3 at 27 degrees C when fully charged per page 78. Clean and tighten the ground strap and starter terminals, and never crank longer than 1 minute; allow 30 minutes cooling between attempts.
Manual Section: Electrics p. 78Rotor bogs down and stalls in the cut, won't hold speed under load
Verify rotor speed against spec before opening the pump: Stage 1 should turn 125 rpm and Stage 11 should reach 185 rpm, with rotor pump control current running 480 mA to 660 mA per page 466. Measure the control current at the pump solenoid; if current is correct but speed is low, test the rotor drive circuit for internal leakage.
Manual Section: Hydraulics p. 466Engine runs hot and overheats halfway through the shift in dusty milling conditions
Check the radiator and cooling air channels first; recycling dust packs them fast. Blow them out from the clean side with compressed air at no more than 5 bar, following the procedure on page 351. Verify coolant level against the 50 litre system capacity listed on page 49, then recheck operating temperature under full rotor load before releasing the machine.
Manual Section: Engine p. 351Diagnosis lamp keeps flashing fault codes, engine derates and then shuts down mid-pass
Read the blink code and match it against the EMR3 fault code list starting before swapping parts. Test sensor supply circuits: the oil pressure sensor should see 5 V per page 208. If you pull a sensor for replacement, torque the oil pressure sensor to 20 Nm and the coolant temperature sensor to 22 Nm on reinstall.
Manual Section: Engine ElectricsFrequently Asked Questions
How do I delete stored fault codes on the BOMAG MPH 122-2?
To delete all stored faults, ensure the engine is not running. Enter code number 710 into the display module to delete all stored faults. This function is only available from software version 1.12. p. 131
What is the tightening torque for M12 8.8 bolts on the Bomag MPH 122-2?
The tightening torque for M12 screws with a metric unified thread and a strength class of 8.8 is 88 Nm. p. 26
What is the oil capacity for the engine on the MPH 122-2?
The engine oil capacity for the MPH 122-2 is approximately 38 litres. p. 39
What is the correct valve clearance for the Deutz TCD 2015 engine in the Bomag MPH 122-2?
The intake valve clearance is 0.25 mm and the exhaust valve clearance is 0.30 mm. p. 342
How often should the hydraulic oil and breather filter be changed?
The hydraulic oil and breather filter should be changed at least every 2 years. p. 54
How quickly can I access this Bomag MPH 122-2 manual after buying?
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