Hitachi ZX 27U-3 User manual

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INTRODUCTION
IN-01
TO THE READER
xThis manual is written for an experienced technician
to provide technical information needed to maintain
and repair this machine.
•Be sure to thoroughly read this manual for cor-
rect product information and service procedures.
•If you have any questions or comments, at if you
found any errors regarding the contents of this
manual, please contact using “Service Manual
Revision Request Form” at the end of this man-
ual.
(Note: Do not tear off the form. Copy it for us-
age.):
Publications Marketing & Product Support
Hitachi Construction Machinery Co. Ltd.
TEL:[phone]
FAX:[phone]
E-mail: [email protected]
ADDITIONAL REFERENCES
xPlease refer to the other materials (operator’s
manual, parts catalog, engine technical material
and Hitachi training material etc.) in addition to this
manual.
MANUAL COMPOSITION
xThis manual consists the Technical Manual and the
Workshop Manual.
•Information included in the Technical Manual:
technical information needed for redelivery and
delivery, operation and activation of all devices
and systems, operational performance tests, and
troubleshooting procedures.
•Information included in the Workshop Manual:
technical information needed for maintenance
and repair of the machine, tools and devices
needed for maintenance and repair, maintenance
standards, and removal/installation and assem-
ble/disassemble procedures.
PAGE NUMBER
xEach page has a number, located on the center
lower part of the page, and each number contains
the following information:
Example : T 1-3-5
Consecutive Page Number for Each Group
Group Number
Section Number
T: Technical Manual W: Workshop Manual
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INTRODUCTION
IN-02
SAFETY ALERT SYMBOL AND HEADLINE
NOTATIONS
In this manual, the following safety alert symbol and
signal words are used to alert the reader to the
potential for personal injury of machine damage.
This is the safety alert symbol. When you see this
symbol, be alert to the potential for personal injury.
Never fail to follow the safety instructions prescribed
along with the safety alert symbol.
The safety alert symbol is also used to draw attention
to component/part weights.
To avoid injury and damage, be sure to use appropri-
ate lifting techniques and equipment when lifting
heavy parts.
xCAUTION:
Indicated potentially hazardous situation which
could, if not avoided, result in personal injury or
death.
xIMPORTANT:
Indicates a situation which, if not conformed to the
instructions, could result in damage to the machine.
xNOTE:
Indicates supplementary technical information or
know-how.
UNITS USED
xSI Units (International System of Units) are used in
this manual.
MKSA system units and English units are also
indicated in parenthheses just behind SI units.
Example : 24.5 MPa (250 kgf/cm2, 3560 psi)
A table for conversion from SI units to other system
units is shown below for reference purposees.
Quantity To Convert
From Into Multiply By
MPa kgf/cm210.197Pressure
MPa psi 145.0
kW PS 1.360Power
kW HP 1.341
Temperature qC qF qCu1.8+32
km/h mph 0.6214Velocity
min-1 rpm 1.0
Flow rate L/min US gpm 0.2642
mL/rev cc/rev 1.0
Quantity To Convert
From Into Multiply By
mm in 0.03937Length
mm ft 0.003281
L US gal 0.2642
L US qt 1.057
Volume
m3yd31.308
Weight kg lb 2.205
N kgf 0.10197Force
N lbf 0.2248
Nm kgfm 1.0197Torque
Nm lbfft 0.7375
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SAFETY
SA-1
RECOGNIZE SAFETY INFORMATION
xThese are the SAFETY ALERT SYMBOLS.
• When you see these symbols on your machine or in
this manual, be alert to the potential for personal injury.
• Follow recommended precautions and safe operating
practices.
SA-688
UNDERSTAND SIGNAL WORDS
xOn machine safety signs, signal words designating the
degree or level of hazard - DANGER, WARNING, or
CAUTION - are used with the safety alert symbol.
• DANGER indicates an imminently hazardous situation
which, if not avoided, will result in death or serious in-
jury.
• WARNING indicates a potentially hazardous situation
which, if not avoided, could result in death or serious
injury.
• CAUTION indicates a potentially hazardous situation
which, if not avoided, may result in minor or moderate
injury.
• DANGER or WARNING safety signs are located near
specific hazards. General precautions are listed on
CAUTION safety signs.
• Some safety signs do not use any of the designated
signal words above after the safety alert symbol are
occasionally used on this machine.
xTo avoid confusing machine protection with personal
safety messages, a signal word IMPORTANT indicates a
situation which, if not avoided, could result in damage to
the machine.
xNOTE indicates an additional explanation for an
element of information.
SA-1223
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