Komatsu 03-M-E3B 03-M-DI-E3B 03-M-E3BG Service Manual

Komatsu 03-M-E3B 03-M-DI-E3B 03-M-E3BG Service Manual

Komatsu 03-M-E3B 03-M-DI-E3B 03-M-E3BG Service Manual


This Workshop Manual has been prepared to provide servicing personnel with information on the mechanism, service, and maintenance of 03-M-E3B, 03-M-DI-E3B, and 03-M-E3BG series. It is divided into three parts, “General”, “Mechanism” and “Servicing”.

Q General
Information on the engine identification, the general precautions, maintenance check list, check and maintenance, and special tools are described.

Q Mechanism
Information on the construction and function are included. This part should be understood before proceeding with troubleshooting, disassembling, and servicing.
Refer to Diesel Engine Mechanism Workshop Manual (Code No. 9Y021-01875) for the one which has not been described in this workshop manual.

Q Servicing
Information on the troubleshooting, servicing specification lists, tightening torque, checking and adjusting, disassembling and assembling, and servicing which cover procedures, precautions, factory specifications, and allowable limits.

All information illustrations and specifications contained in this manual are based on the latest product information available at the time of publication.

Komatsu 03-M-E3B 03-M-DI-E3B 03-M-E3BG Service Manual
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The right is reserved to make changes in all information at any time without notice. Due to covering many models of this manual, information or picture being used, have not been specified as one model.

Komatsu 03-M-E3B 03-M-DI-E3B 03-M-E3BG Service Manual

• Read all instructions and safety instructions in this
manual and on your engine safety decals.
• Clean the work area and engine.
• Park the machine on a firm and level ground.
• Allow the engine to cool before proceeding.
• Stop the engine, and remove the key.
• Disconnect the battery negative cable.
• Hang a “DO NOT OPERATE” tag in operator


• Do not work on the machine while under the influence
of alcohol, medication, or other substances or while

• Wear close fitting clothing and safety equipment
appropriate to the job.

• Use tools appropriate to the work. Makeshift tools,
parts, and procedures are not recommended.

• When servicing is performed together by two or more
persons, take care to perform all work safely.

• Do not touch the rotating or hot parts while the engine
is running.

• Never remove the radiator cap while the engine is
running, or immediately after stopping. Otherwise, hot
water will spout out from radiator. Only remove
radiator cap when cool enough to touch with bare
hands. Slowly loosen the cap to first stop to relieve
pressure before removing completely.

• Escaping fluid (fuel or hydraulic oil) under pressure
can penetrate the skin causing serious injury. Relieve
pressure before disconnecting hydraulic or fuel lines.
Tighten all connections before applying pressure.

• Wear a suitable hearing protective device such as
earmuffs or earplugs to protect against objectionable
or uncomfortable loud noises.

• Do not open high-pressure fuel system.
High-pressure fluid remaining in fuel lines can cause
serious injury. Do not disconnect or attempt to repair
fuel lines, sensors, or any other components between
the high-pressure fuel pump and injectors on engines
with high pressure common rail fuel system.

• High voltage exceeding 100 V is generated in the
ECU, and is applied to the injector.
Pay sufficient caution to electric shock when
performing work activities.

Komatsu 03-M-E3B 03-M-DI-E3B 03-M-E3BG Service Manual