Merlo DBM 2000 XS, DBM 2000 EV and DBM 2500 EV Engine Removal Service Manual [PDF] ENG

This PDF service manual provides detailed workshop instructions for removing and reinstalling the engine fitted to selected Merlo DBM self-loading concrete mixers.

It is intended for qualified mechanics, service workshops and experienced technicians familiar with mechanical, hydraulic and electrical systems. The procedures cover specialist maintenance work that is not normally included in the standard operation and maintenance handbook.

The manual uses clear workshop photographs to identify hydraulic hoses, electrical connectors, mounting points, brackets and other components that must be disconnected before the engine can be safely removed.

The manual includes

• General workshop and safety instructions;
• Required standard tools and tool sizes;
• Estimated engine removal and reinstallation times;
• Engine bonnet removal;
• Correct battery disconnection procedure;
• Drum rotation pump hose identification;
• Drum rotation solenoid removal;
• Inching-control cable disconnection;
• Hydraulic oil tank and filter-support removal;
• Hydrostatic pump disconnection and removal;
• Cooling-system and radiator hose removal;
• Engine air-intake system disconnection;
• Exhaust manifold and extension pipe removal;
• Accelerator cable disconnection;
• Diesel fuel-line removal;
• Service pump pipe disconnection;
• Electrical cable and relay plate removal;
• Engine earth connection disconnection;
• Engine mounting bolt removal;
• Engine lifting and support instructions;
• Engine reinstallation procedure;
• Hydrostatic oil-level check after assembly;
• Metric tightening-torque specifications;
• Information about thread-locking compounds, sealants and lubricants.

Engine preparation and battery disconnection

The procedure begins with removing the engine bonnet and disconnecting the battery terminals. The manual specifies that the negative terminal must be disconnected before the positive terminal.

It also notes that two people are required to remove the bonnet safely.

Drum rotation hydraulic system

Before the engine can be removed, the manual explains how to identify, mark and disconnect the pipes connected to the drum rotation pump.

These include:

• Hydraulic motor supply lines;
• Drain line to the hydrostatic transmission oil tank;
• Supply from the in-line filter;
• Flushing line from the in-line filter.

Marking the position of each hose before removal is recommended to simplify correct reinstallation.

The procedure also covers removal of the drum rotation direction solenoids and disconnection of the inching-control cable.

Hydraulic oil tank and hydrostatic pump

The manual provides instructions for disconnecting:

• Cooling-system pipes from the filter support;
• Hydraulic oil-level indicator connector;
• Hydraulic tank drain pipe;
• Hydrostatic pump and motor drain lines;
• Thermocontact block drain line;
• Power-brake return line;
• Gearbox and differential-lock control lines;
• High-pressure hydraulic lines.

The hydraulic oil tank and its support are then removed to provide access to the engine and hydrostatic pump.

The hydrostatic pump must be supported with suitable lifting equipment before its mounting bolts are removed. The manual then explains how to remove the pump safely and place it on a suitable workbench.

Cooling, intake and exhaust systems

The engine removal procedure includes disconnection of:

• Radiator and cooling-system hoses;
• Engine air-intake pipe;
• Exhaust manifold;
• Exhaust extension pipe;
• Accelerator control cables.

These steps provide the clearance required to lift the engine out of the machine without damaging surrounding components.

Fuel and service hydraulic connections

The manual explains how to remove the diesel fuel pipes, engine cooling pipes and hydraulic pipes connected to the service pump.

Electrical connections

The electrical disconnection procedure covers:

• Engine wiring connectors in the battery compartment;
• Relay plate removal;
• Positive battery cable routing;
• Relay plate wiring;
• Engine earth strap.

The cables are pulled through the chassis opening before the engine is lifted from the machine.

Engine lifting and removal

After all hydraulic, cooling, fuel and electrical connections have been removed, the engine must be supported using suitable lifting equipment attached to the designated engine lifting points.

The engine mounting bolts are then removed, and the engine can be carefully lifted from the machine. The manual warns technicians to avoid damaging the radiator or radiator cooling fan during removal.

Engine reinstallation

Engine reinstallation is carried out by performing the removal steps in reverse order.

During installation, care must be taken to prevent the radiator fan from contacting the radiator. Once the engine has been installed, the hydrostatic oil level must be checked and topped up where necessary.

Required tools

The manual identifies the standard workshop tools required, including:

• Spanners from 10 mm to 80 mm;
• 10 mm hexagon key;
• Ratchet handle;
• Sliding handle;
• External and internal hexagon sockets;
• Torque wrench;
• 100 mm and 200 mm extensions.

Estimated repair times

The manual provides the following estimated workshop times:

• Complete engine removal: 2 hours and 30 minutes;
• Complete engine reinstallation: 4 hours.

Product information

Manufacturer: Merlo
Applicable models: DBM 2000 XS, DBM 2000 EV and DBM 2500 EV
Procedure covered: Engine removal and reinstallation
Document type: Workshop Service Manual
Manual reference: DBM-SMMO.01
Application: From SAV 741511 onwards
Language: English
Format: Digital PDF file
Number of pages: 28 pages

Important information before purchase

Please check your machine model and SAV number before purchasing.

This is a specialised engine removal and installation manual. It explains how to remove the engine from the machine but does not provide complete internal engine dismantling, overhaul or repair instructions.

The procedures involve heavy components, hydraulic systems, fuel lines and lifting equipment. They are intended for qualified technicians with suitable workshop tools, hoisting equipment and machinery repair experience.