Hitachi Ex27u User manual

PART NO. EM1BU-NA3-1

Operator’s Manual

EX27U

EX35U

EX50U

Excavator

INTRODUCTION

Read this manual carefully to learn how to operate

and service your machine correctly. Failure to do so

could result in personal injury or equipment damage.

This manual should be considered a permanent

part of your machine and should remain with the

machine when you sell it.

This machine is of metric design. Measurements in

this manual are metric. Use only metric hardware and

tools as specified.

• SI Units (International System of Units) are used in

this manual.

For reference MKS system units and English units

are also indicated in parentheses after the SI units.

Example : 24.5 MPa (250 kgf/cm2, 3560 psi)

Right-hand and left-hand sides are determined by

facing in the direction of forward travel.

Write product identification numbers in the

Machine Numbers section. Accurately record all the

numbers to help in tracing the machine should it be

stolen. Your dealer also needs these numbers when

you order parts. If this manual is kept on the machine,

also file the identification numbers in a secure place

off the machine.

Warranty is provided as a part of Hitachi's support

program for customers who operate and maintain their

equipment as described in this manual. The warranty

is explained on the warranty certificate which you

should have received from your dealer.

This warranty provides you the assurance that Hitachi

will back its products where defects appear within the

warranty period. In some circumstances, Hitachi also

provides field improvements, often without charge to

the customer, even if the product is out of warranty.

Should the equipment be abused, or modified to

change its performance beyond the original factory

specifications, the warranty will become void and field

improvements may be denied. Setting fuel delivery

above specifications or otherwise overpowering

machines will result in such action.

All information, illustrations and specifications in this manual are based on the latest product information available

at the time of publication. The right is reserved to make changes at any time without notice.

MACHINE NUMBERS

SAFETY

SAFETY SIGNS

COMPONENTS NAME

OPERATOR’S STATION

BREAK-IN

OPERATING THE ENGINE

DRIVING THE MACHINE

TRANSPORTING

MAINTENANCE

STORAGE

TROUBLESHOOTING

SPECIFICATIONS

INDEX

OPERATING THE MACHINE

CONTENTS

MACHINE NUMBERS

Machine Type and Serial Number

Product Identification Number (PIN)

SAFETY

Recognize Safety Information..............................S1

Understand Signal Words....................................S1

Follow Safety Instructions ....................................S2

Prepare for Emergencies.....................................S2

Wear Protective Clothing .....................................S3

Protect Against Noise...........................................S3

Inspect Machine...................................................S3

Use Handholds and Steps....................................S4

Adjust the Operator’s Seat...................................S4

Fasten Your Seat Belt..........................................S5

Move and Operate Machine Safely......................S5

Operate Only from Operator’s Seat .....................S6

Jump Starting.......................................................S6

Keep Riders Off Machine.....................................S6

Investigate Job Site Beforehand ..........................S7

Protect Against Falling Stones and Debris...........S7

Provide Signals for Jobs Involving

Multiple Numbers of Machines.......................S8

Confirm Direction of Machine to be Driven ..........S8

Drive Machine Safely............................................S9

Avoid Injury from Rollaway Accidents ................S10

Avoid Injury from Back-Over

and Swing Accidents....................................S11

Keep Person Clear from Working Area..............S12

Never Position Bucket Over Anyone..................S12

Avoid Undercutting.............................................S12

Avoid Tipping......................................................S13

Never Undercut a High Bank..............................S13

Dig with Caution.................................................S14

Operate with Caution..........................................S14

Avoid Power Lines..............................................S14

Do Not Use for Craning Operation.....................S15

Protect Against Flying Debris.............................S15

Park Machine Safely ..........................................S15

Handle Fluids Safely – Avoid Fires.....................S16

Safety Transporting............................................S17

Practice Safe Maintenance ................................S18

Support Machine Properly..................................S19

Stay Clear of Moving Parts.................................S19

Warn Others of Service Work............................S19

Prevent Parts from Flying...................................S20

Store Attachments Safely...................................S20

Prevent Burns.....................................................S21

Replace Rubber Hoses Periodically...................S21

Avoid High-Pressure Fluids................................S22

Prevent Fires......................................................S23

Evacuating in Case of Fire.................................S24

Beware of Exhaust Fumes.................................S24

Avoid Heating Near Pressurized Fluid Lines......S25

Avoid Applying Heat to Lines

Containing Flammable Fluids.......................S25

Remove Paint before Welding or Heating..........S25

Prevent Battery Explosions.................................S26

Avoid Harmful Asbestos Dust.............................S26

Handle Chemical Products Safely......................S27

Dispose of Waste Properly.................................S27

SAFETY SIGNS ..........................................S28

COMPONENTS NAME ..............................1-1

OPERATOR’S STATION

Pedals and Levers...............................................1-2

Monitor Panel and Switch Panel..........................1-3

Key Switch...........................................................1-4

Work Light Switch................................................1-4

Monitor Panel.......................................................1-5

Alternator Indicator ..............................................1-5

Engine Oil Pressure Indicator..............................1-5

Preheat Indicator .................................................1-6

Coolant Temperature Gauge

and Overheat Indicator..................................1-6

Fuel Gauge and Fuel Level Indicator...................1-7

Hour Meter...........................................................1-7

Cab Heater ..........................................................1-8

Wiper/Washer Switch..........................................1-8

Opening and Closing Front Window ..................1-9

Emergency Exit..................................................1-10

Tool Box and Operator’s Manual Box................1-11

Cab Door Release Lever...................................1-11

Cab Light............................................................1-11

Adjusting the Operator’s Seat............................1-12

Seat Belt (EX27u, EX35u) .................................1-13

Seat Belt (EX50u)..............................................1-14

BREAK-IN

Breaking in a New Machine.................................2-1

Correct Break-In Procedures...............................2-1

OPERATING THE ENGINE

Before Starting Engine.........................................3-1

Engine Speed Control Lever................................3-1

Starting the Engine ..............................................3-2

Check Instruments after Starting.........................3-2

Using Booster Batteries.......................................3-3

Stopping the Engine.............................................3-4

DRIVING THE MACHINE

Travel Levers.......................................................4-1

Fast Speed Travel Pedal.....................................4-2

Travel Alarm ........................................................4-2

Traveling..............................................................4-3

Operating on Soft Ground....................................4-4

Raise One Track Using Boom and Arm ..............4-4

Towing Machine a Short Distance.......................4-5

Operating in Water or Mud..................................4-6

Precautions for Traveling on Slopes....................4-7

CONTENTS

Parking and Stopping on a Slope........................ 4-8

Parking the Machine............................................ 4-8

OPERATING THE MACHINE

Control Lever (ISO Excavator Pattern)................ 5-1

Control Lever (SAE-Backhoe Pattern) ................ 5-2

Shifting the Control Lever Control Pattern........... 5-3

Boom-Swing Pedal ............................................ 5-4

Optional Pedal..................................................... 5-5

Blade Lever......................................................... 5-7

Pilot Control Shut-Off Lever ................................ 5-8

Warming Up Operation ..................................... 5-10

Warming Up in Cold Weather........................... 5-10

Precautions for Operations ............................... 5-11

Avoid Tipping..................................................... 5-12

Operating Backhoe............................................ 5-13

Grading Operation............................................. 5-14

Avoid Abusive Operation................................... 5-14

Select Correct Track Shoes.............................. 5-15

Operating Tips................................................... 5-15

Object Handling --- If Equipped......................... 5-16

Avoid Hitting Blade with Front Attachment........ 5-17

Avoid Hitting Blade with Bucket......................... 5-17

Avoid Striking the Blade into a Rock................. 5-17

Boom Cylinder May Hit Track............................ 5-18

Precautions for Installing Wide Bucket

or Special Type Bucket ............................... 5-18

Operate the Machine Safely.............................. 5-19

Using Rubber Crawler....................................... 5-20

Traveling and Other Cautions ........................... 5-21

Emergency Stop Procedure to

Lower Front Attachment.............................. 5-22

Hydraulic Breaker Operating Tips

--- Optional.................................................. 5-23

Replacement of Hydraulic Oil

and Filter Element....................................... 5-25

Operating Hydraulic Crusher --- If Equipped..... 5-26

After Finishing Work.......................................... 5-27

TRANSPORTING

Transporting by Road.......................................... 6-1

Transporting the Machine by Truck..................... 6-1

Precautions for Transporting Machines

with Rubber Tracks....................................... 6-3

Lifting the Entire Machine with a Crane............... 6-5

MAINTENANCE

Correct Maintenance and

Inspection Procedures .................................. 7-1

Service Your Machine at Specified Intervals....... 7-2

Check the Hour Meter Regularly......................... 7-2

Prepare Machine for Maintenance...................... 7-3

Hood and Access Covers.................................... 7-4

Daily Inspection................................................... 7-5

Daily Inspection Check List................................. 7-6

Periodic Replacement of Parts............................ 7-7

Maintenance Guide..............................................7-8

The Brand Names of Recommended

Oils and Lubricants......................................7-10

A. Greasing......................................................7-11

Front Joint Pins............................................7-11

Bucket and Link Pins...................................7-13

Precautions for Front Attachment and

Blade Removal.......................................7-13

Swing Bearing..............................................7-14

Swing Internal Gear.....................................7-15

Control Lever Universal Joint.......................7-16

B. Engine..........................................................7-17

Engine Oil Level...........................................7-17

Change Engine Oil.......................................7-18

Replace Engine Oil Filters...........................7-18

C. Transmission...............................................7-20

D. Hydraulic System.........................................7-22

Inspection and Maintenance of

Hydraulic Equipment..............................7-22

Check Hydraulic Oil Level............................7-23

Drain Hydraulic Tank Sump.........................7-24

Change Hydraulic Oil...................................7-25

Replace Hydraulic Oil Tank Filter................7-29

Check Hoses and Lines...............................7-34

E. Fuel System.................................................7-38

Drain Fuel Tank Sump.................................7-39

Check Water Separator...............................7-40

Replace Fuel Filter.......................................7-41

F. Air Cleaner...................................................7-42

Clean the Air Cleaner Element....................7-42

G. Cooling System............................................7-44

Check Coolant Level ...................................7-45

Check and Adjust Fan Belt Tension............7-46

Change Coolant...........................................7-47

Clean Radiator Core....................................7-49

H. Electrical System.........................................7-50

Replacing Fuses..........................................7-52

Electical Socket ...........................................7-53

I. Miscellaneous..............................................7-54

Check Bucket Teeth....................................7-54

Replace Bucket ...........................................7-56

Adjusting Bucket Linkage............................7-57

Check Track Sag (rubber crawler) ..............7-58

Replace Rubber Track.................................7-60

Check Track Sag (steel crawler).................7-61

Check and Replace Seat Belt......................7-64

Check Fuel Injection Nozzles ......................7-64

Check and Adjust Valve Clearance.............7-64

Check Injection Timing................................7-65

Measure Engine Compression pressure.....7-65

Check Starter and Alternator.......................7-65

Check Radiator Cap....................................7-65

Check Tightening Torque of

Bolts and Nuts.......................................7-66

Often-Replaced Parts ........................................7-69

CONTENTS

Maintenance Under Special

Environmental Conditions ........................... 7-70

STORAGE

Storing the Machine ..........................................10-1

Removing the Machine From Storage .............. 10-2

TROUBLESHOOTING

Troubleshooting................................................. 11-1

SPECIFICATIONS

Specifications (EX27u)...................................... 12-1

Working Ranges (EX27u) ................................. 12-2

Shoe Types and Applications (EX27u).............. 12-3

Bucket Types and Applications (EX27u)........... 12-4

Specifications (EX35u)...................................... 12-5

Working Ranges (EX35u) ................................. 12-6

Shoe Types and Applications (EX35u).............. 12-7

Bucket Types and Applications (EX35u)........... 12-8

Specifications (EX50u)...................................... 12-9

Working Ranges (EX50u) ............................... 12-10

Shoe Types and Applications (EX50u)............ 12-11

Bucket Types and Applications (EX50u)......... 12-12

INDEX............................................................. 14-1

MACHINE NUMBERS

MACHINE TYPE AND SERIAL NUMBER

MODEL/TYPE:

PRODUCT

IDENTIFICATION

NUMBER:

PRODUCT IDENTIFICATION NUMBER (PIN)

PRODUCT

IDENTIFICATION

NUMBER:

NOTE:

∗1BUP001001∗

PRODUCT IDENTIFICATION

NUMBER (PIN)

M571-01-018

M570-07-009

Marks to indicate the start and

end of the PIN

INDEX

MACHINE NUMBERS

MEMO

.....................................................................................................................................................................................

SAFETY

S-1

RECOGNIZE SAFETY INFORMATION

• This is the SAFETY ALERT SYMBOL.

• When you see this symbol on your machine or in this

manual, be alert to the potential for personal injury.

• Follow recommended precautions and safe operating

practices.

001-E01A-0001-2

SA-001

UNDERSTAND SIGNAL WORDS

• On 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.

• CAUTION also calls attention to safety messages in this

manual.

• To 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.

• NOTE indicates an additional explanation for an

element of information.

002-E01A-0461-6

SA-1223

INDEX

SAFETY

S-2

FOLLOW SAFETY INSTRUCTIONS

• Carefully read and follow all safety signs on the machine

and all safety messages in this manual.

• Safety signs should be installed, maintained and re-

placed when necessary.

• If a safety sign or this manual is damaged or missing,

order a replacement from your authorized dealer in

the same way you order other replacement parts (be

sure to state machine model and serial number when

ordering).

• Learn how to operate the machine and its controls cor-

rectly and safely.

• Allow only trained, qualified, authorized personnel to op-

erate the machine.

• Keep your machine in proper working condition.

• Unauthorized modifications of the machine may impair

its function and/or safety and affect machine life.

• The safety messages in this SAFETY chapter are in-

tended to illustrate basic safety procedures of machines.

However it is impossible for these safety messages to

cover every hazardous situation you may encounter. If

you have any questions, you should first consult your

supervisor before operating or performing maintenance

work on the machine.

003-E01A-0003-5

SA-003

PREPARE FOR EMERGENCIES

• Be prepared if a fire starts or if an accident occurs.

• Keep a first aid kit and fire extinguisher on hand.

• Thoroughly read and understand the label attached on

the fire extinguisher to use it properly.

• Establish emergency procedure guidelines to cope

with fires and accidents.

• Keep emergency numbers for doctors, ambulance

service, hospital, and fire department posted near

your telephone.

004-E01A-0437-3

SA-437

SAFETY

S-3

WEAR PROTECTIVE CLOTHING

• Wear close fitting clothing and safety equipment appro-

priate to the job.

You may need:

A hard hat

Safety shoes

Safety glasses, goggles, or face shield

Heavy gloves

Hearing protection

Reflective clothing

Wet weather gear

Respirator or filter mask.

Be sure to wear the correct equipment and clothing for

the job. Do not take any chances.

• Avoid wearing loose clothing, jewelry, or other items

that can catch on control levers or other parts of the

machine.

• Operating equipment safely requires the full attention of

the operator. Do not wear radio or music headphones

while operating the machine.

005-E01A-0438-4

SA-438

PROTECT AGAINST NOISE

• Prolonged exposure to loud noise can cause impairment

or loss of hearing.

• Wear a suitable hearing protective device such as

earmuffs or earplugs to protect against objectionable

or uncomfortably loud noises.

006-E01A-0434-2

SA-434

INSPECT MACHINE

• Inspect your machine carefully each day or shift by walk-

ing around it before you start it to avoid personal injury.

• In the walk-around inspection, be sure to cover all

points described in the “PRE-START INSPECTION”

chapter.

007-E01A-0435-2 SA-435

SAFETY

S-4

USE HANDHOLDS AND STEPS

• Falling is one of the major causes of personal injury.

• When you get on and off the machine, always face the

machine and maintain a three-point contact with the

steps and handrails.

• Do not use any controls as handholds.

• Never jump on or off the machine. Never mount or

dismount a moving machine.

• Be careful of slippery conditions on platforms, steps,

and handrails when leaving the machine.

008-E01A-0439-3

SA-439

ADJUST THE OPERATOR'S SEAT

• A poorly adjusted seat for either the operator or for the

work at hand may quickly fatigue the operator leading to

misoperations.

• The seat should be adjusted whenever changing the

operator for the machine.

• The operator should be able to fully depress the ped-

als and to correctly operate the control levers with his

back against the seat back.

• If not, move the seat forward or backward, and check

again.

009-E01A-0378-3

SA-378

SAFETY

S-5

FASTEN YOUR SEAT BELT

• If the machine should overturn, the operator may be-

come injured and/or thrown from the cab. Additionally

the operator may be crushed by the overturning machine,

resulting in serious injury or death.

• Prior to operating the machine, thoroughly examine

webbing, buckle and attaching hardware. If any item is

damaged or worn, replace the seat belt or component

before operating the machine.

• Be sure to remain seated with the seat belt securely

fastened at all times when the machine is in operation

to minimize the chance of injury from an accident.

010-E02A-0237-3

SA-237

MOVE AND OPERATE MACHINE SAFELY

• Bystanders can be run over.

• Take extra care not to run over bystanders. Confirm

the location of bystanders before moving, swinging, or

operating the machine.

• Always keep the travel alarm and horn in working con-

dition (if equipped). It warns people when the machine

starts to move.

• Use a signal person when moving, swinging, or oper-

ating the machine in congested areas. Coordinate

hand signals before starting the machine.

011-E01A-0529-4

SA-659

SAFETY

S-6

OPERATE ONLY FROM OPERATOR'S SEAT

• Inappropriate engine starting procedure may cause the

machine to runaway, possibly resulting in serious injury

or death.

• Start the engine only from the operator's seat.

• NEVER start the engine while standing on the track or

on ground.

• Do not start engine by shorting across starter termi-

nals.

• Before starting the engine, confirm that all control lev-

ers are in neutral.

012-E01A-0444-3

SA-444

JUMP STARTING

• Battery gas can explode, resulting in serious injury.

• If the engine must be jump started, be sure to follow

the instructions shown in the “OPERATING THE EN-

GINE” chapter.

• The operator must be in the operator’s seat so that

the machine will be under control when the engine

starts. Jump starting is a two-person operation.

• Never use a frozen battery.

• Failure to follow correct jump starting procedures

could result in a battery explosion or a runaway ma-

chine.

013-E01A-0032-3

SA-032

KEEP RIDERS OFF MACHINE

• Riders on machine are subject to injury such as being

struck by foreign objects and being thrown off the ma-

chine.

• Only allow the operator on the machine. Keep riders

off.

• Riders also obstruct the operator’s view, resulting in

the machine being operated in an unsafe manner.

014-E01A-0530-2

SA-660

SAFETY

S-7

INVESTIGATE JOB SITE BEFOREHAND

• When working at the edge of an excavation or on a road

shoulder, the machine could tip over, possibly resulting

in serious injury or death.

• Investigate the configuration and ground conditions of

the job site beforehand to prevent the machine from

falling and to prevent the ground, stockpiles, or banks

from collapsing.

• Make a work plan. Use machines appropriate to the

work and job site.

• Reinforce ground, edges, and road shoulders as nec-

essary. Keep the machine well back from the edges of

excavations and road shoulders.

• When working on an incline or on a road shoulder,

employ a signal person as required.

• Confirm that your machine is equipped a FOPS cab

before working in areas where the possibility of falling

stones or debris exist.

• When the footing is weak, reinforce the ground before

starting work.

• When working on frozen ground, be extremely alert.

As ambient temperatures rise, footing becomes loose

and slippery.

015-E01A-0531-5

SA-661

PROTECT AGAINST FALLING STONES AND

DEBRIS

• Confirm that your machine is FOPS cab equipped be-

fore working in areas where the possibility of falling

stones or debris exist.

016-E01A-0510-2

SAFETY

S-8

PROVIDE SIGNALS FOR JOBS INVOLVING

MULTIPLE NUMBERS OF MACHINES

• For jobs involving multiple numbers of machines, pro-

vide signals commonly known by all personnel involved.

Also, appoint a signal person to coordinate the job site.

Make sure that all personnel obey the signal person’s

directions.

018-E01A-0481-2

SA-481

CONFIRM DIRECTION OF MACHINE TO BE

DRIVEN

• Incorrect travel pedal/lever operation may result in seri-

ous injury death.

• Before driving the machine, confirm the position of the

undercarriage in relation to the operator’s position. If

the travel motors are located in front of the cab, the

machine will move in reverse when travel ped-

als/levers are operated to the front.

017-E01A-0532-2

SA-662

SAFETY

S-9

DRIVE MACHINE SAFELY

• Before moving the machine, confirm which way to move

travel pedals/levers for the corresponding direction you

wish to go.

• Pushing the travel levers forward moves the machine

towards the idlers. (Refer to the Driving the Machine

“Travel Levers” section for correct travel operation.)

• Traveling on a grade may cause the machine to slip or

to overturn, possibly resulting in serious injury or death.

• When traveling up or down a grade, keep the bucket

in the direction of travel, approximately 200 to 300 mm

(8 to 12 in) (A) above the ground.

• If machine starts to skid or becomes unstable, lower

the bucket immediately.

• Traveling across the face of slope or steering on a

slope may cause the machine to skid or to turnover. If

the direction must be changed, move the machine to

level ground, then, change the direction to ensure

safe operation.

019-E02A-0547-8

SA-663

SA-664

SA-441

SA-442

SAFETY

S-10

AVOID INJURY FROM ROLLAWAY

ACCI-DENTS

• Death or serious injury may result if you attempt to

mount or stop a moving machine.

To avoid rollaways:

• Select level ground when possible to park machine.

• Do not park the machine on a grade.

• Lower the bucket to the ground.

• Run the engine at slow idle speed without load for 5

minutes to cooling it.

• Stop the engine and remove the key from the key

switch.

• Pull the pilot controls shut-off lever to LOCK position.

• Block both tracks and lower the bucket to the ground,

thrust the bucket teeth into the ground if you must

park on a grade.

• Position the machine to prevent rolling.

• Park a reasonable distance from other machines.

020-E01A-0548-4

SA-666

SAFETY

S-11

AVOID INJURY FROM BACK-OVER AND

SWING ACCIDENTS

• If any person is present near the machine when backing

or swinging the upperstructure, the machine may hit or

run over that person, resulting in serious injury or death.

To avoid back-over and swing accidents:

• Always look around BEFORE YOU BACK UP AND

SWING THE MACHINE. BE SURE THAT ALL

BYSTANDERS ARE CLEAR.

• Keep the travel alarm in working condition (if

equipped).

ALWAYS BE ALERT FOR BYSTANDERS MOVING

INTO THE WORK AREA. USE THE HORN OR

OTHER SIGNAL TO WARN BYSTANDERS BEFORE

MOVING MACHINE.

• USE A SIGNAL PERSON WHEN BACKING UP IF

YOUR VIEW IS OBSTRUCTED. ALWAYS KEEP THE

SIGNAL PERSON IN VIEW.

Use hand signals, which conform to your local

regulations, when work conditions require a signal

person.

• No machine motions shall be made unless signals are

clearly understood by both signalman and operator.

• Learn the meanings of all flags, signs, and markings

used on the job and confirm who has the responsibility

for signaling.

• Keep windows, mirrors, and lights clean and in good

condition.

• Dust, heavy rain, fog, etc., can reduce visibility. As

visibility decreases, reduce speed and use proper

lighting.

• Read and understand all operating instructions in the

operator’s manual.

021-E01A-0494-8

SA-383

SA-384

SAFETY

S-12

KEEP PERSON CLEAR FROM WORKING

AREA

• A person may be hit severely by the swinging front

attachment or counterweight and/or may be crushed

against an other object, resulting in serious injury or

death.

• Keep all persons clear from the area of operation and

machine movement.

• Before operating the machine, set up barriers to the

sides and rear area of the bucket swing radius to

prevent anyone from entering the work area.

022-E01A-0537-3

SA-667

NEVER POSITION BUCKET OVER ANYONE

• Never lift, move, or swing bucket above anyone or a

truck cab.

Serious injury or machine damage may result due to

bucket load spill or due to collision with the bucket.

023-E01A-0538-2

SA-668

AVOID UNDERCUTTING

• In order to retreat from the edge of an excavation if the

footing should collapse, always position the

undercarriage perpendicular to the edge of the

excavation with the travel motors at the rear.

• If the footing starts to collapse and if retreat is not

possible, do not panic. Often, the machine can be

secured by lowering the front attachment, in such

cases.

024-E01A-0539-2

SA-669

Hitachi EX27U User manual

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