Maeda MC-305C-2 User manual

103E-OM1805-08
OPERATION MANUAL
MINI-CRAWLER CRANE
Serial No. D0338 and up
Unsafe use of this machine may cause serious injury or death. Operators
must read this manual before operating this machine. This manual should
be kept near the machine for reference and periodically reviewed by all
personnel who will come into contact with it.
NOTICE
MAEDAhas Operation Manual written in some other languages. If a foreign
language manual is necessary, contact your local distributor for availability.

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CONTENTS
ITEM Page
INTRODUCTION 1- 1
1. INTRODUCTION 1- 2
2.FOR SAFE USE OF MACHINE 1- 3
3. MACHINE OVERVIEW 1- 4
3.1 SPECIFIED OPERATIONS 1- 4
3.2 MACHINE CONFIGURATION 1- 4
3.3 MACHINE FUNCTIONS 1- 5
4. QUALIFICATION FOR OPERATION 1- 6
4.1 QUALIFICATION FOR CRANE OPERATION 1- 6
5. TERMINOLOGY 1- 7
5.1 DEFINITIONS OF TERMS 1- 7
5.2 DIAGRAM OF WORKING RADIUS AND LIFTING HEIGHT 1- 8
5.3 RATED TOTAL LOAD TABLE 1- 9
5.4 LOAD INDICATOR 1-15
SAFETY 2- 1
1. BASIC PRECAUTIONS 2- 2
2. DRIVING RELATED PRECAUTIONS 2- 7
2.1 BEFORE STARTING ENGINE 2- 7
2.2 AFTER STARTING ENGINE 2- 8
2.3 WORKING WITH CRANE 2-12
3. TRANSPORT PRECAUTIONS 2-21
4. BATTERY HANDLING PRECAUTIONS 2-23
5. MAINTENANCE PRECAUTIONS 2-25
5.1 PRECAUTIONS BEFORE MAINTENANCE 2-25
5.2 PRECAUTIONS DURING MAINTENANCE 2-27
6. SAFETY LABEL LOCATIONS 2-32
7. WEEE DIRECTIVE LABEL LOCATIONS 2-42
OPERATION 3- 1
1. MACHINE EACH SECTION 3- 2
1.1 MACHINE EACH UNIT 3- 2
1.2 TRAVELING AND CRANE OPERATION UNITS 3- 3
1.3 INSTRUMENT PANEL SECTIONS 3- 6
1.3.1 DESCRIPTION OF EACH SWITCHES 3- 7
1.3.2 DESCRIPTION OF EACH MONITORS 3-10
1.3.3 DESCRIPTION OF FUSES 3-12
1.4 OUTRIGGER OPERATION PANEL 3-13
1.5 OUTRIGGER SAFETY DEVICES 3-15
1.5.1 FUNCTIONS OF OUTRIGGER SAFETY DEVICES 3-15
1.5.2 NAMES AND DESCRIPTIONS OF OUTRIGGER DISPLAY 3-16
1.5.3 OUTRIGGER UN-SET WARNING LAMP 3-17
1.6 MOMENT LIMITER (OVERLOAD DETECTOR) 3-18
1.6.1 MOMENT LIMITER CONFIGURATION 3-18
1.6.2 FUNCTION OF MOMENT LIMITER 3-19

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ITEM Page
1.6.3 MOMENT LIMITER OPERATIONS 3-20
1.6.4 NAMES OF MOMENT LIMITER DISPLAY UNIT 3-22
1.6.5 MOMENT LIMITER FUNCTIONS 3-29
1.6.6 MOMENT LIMITER STARTING STATUS 3-31
1.6.7 MOMENT LIMITER WORKING ENVELOPE SETTING 3-32
1.6.8 EMERGENCY STOP CANCEL SWITCH 3-33
1.6.9 MOMENT LIMITER ERROR CAUSES AND ACTIONS TO BE TAKEN 3-34
1.7 OVER HOIST DETECTOR 3-35
1.8 OPERATION SEAT 3-36
1.9 ENGINE HOOD 3-37
1.10 MACHINERY COVER 3-38
2. OPERATIONS 3-40
2.1 CHECKING BEFORE OPERATION 3-40
2.1.1 CHECKING BEFORE STARTING ENGINE (VISIBLE CHECKS) 3-40
2.1.2 CHECKING BEFORE STARTING ENGINE 3-43
2.1.3 CHECKING AFTER STARTING ENGINE 3-56
2.2 STARTING ENGINE 3-66
2.2.1 NORMAL ENGINE START 3-66
2.2.2 STARTING ENGINE IN COLD WEATHER 3-67
2.3 OPERATIONS AND CHECKS AFTER STARTING ENGINE 3-68
2.4 BREAKING-IN MACHINE 3-70
2.5 MACHINE TRAVELING POSTURE 3-70
2.6 STARTING MOVING MACHINE 3-71
2.7 CHANGING MACHINE TRAVELING MODE 3-72
2.8 CHANGING PATH OF MACHINE 3-72
2.9 STOPPING/PARKING MACHINE 3-74
2.10 STOPPING ENGINE 3-75
2.11 INSPECTION AFTER STOPPING ENGINE 3-75
2.12 CAUTIONS IN DRIVING 3-76
2.13 DESCRIPTION ON OUTRIGGER AND CRANE SAFETY DEVICES 3-78
2.14 OUTRIGGER SETTING OPERATION 3-82
2.14.1 NAME OF OUTRIGGER COMPONENTS 3-84
2.14.2 OUTRIGGER SETTING OPERATION 3-84
2.15 CAUTIONS BEFORE CRANE OPERATION 3-88
2.16 OPERATIONS BEFORE CRANE OPERATIONS 3-89
2.17 CRANE OPERATION POSTURE 3-90
2.18 HOOK RAISING/LOWERING OPERATION 3-90
2.19 BOOM DERRICKING OPERATION 3-91
2.20 BOOM TELESCOPING OPERATION 3-92
2.21 SLEWING OPERATION 3-93
2.22 ACCELERATION OPERATION 3-93
2.23 CRANE STOWING OPERATION 3-94
2.24 OUTRIGGER STOWING OPERATION 3-96
2.25 DOS AND DON’TS DURING CRANE OPERATIONS 3-100

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ITEM Page
3. HANDLING RUBBER TRACKS 3-102
3.1 GOOD USE 3-102
3.2 WARRANTY 3-102
3.3 DOS AND DON’TS 3-103
3.4 CAUTIONS IN USING RUBBER TRACKS 3-104
4. HANDLING WIRE ROPES 3-106
4.1 BENCH MARK FOR REPLACING WIRE ROPES 3-106
4.2 What TO DO WITH TWISTED WINCH WIRE ROPE 3-107
5. TRANSPORTATION 3-108
5.1 LOADING/UNLOADING 3-108
5.2 HOISTING MACHINE 3-109
5.3 CAUTIONS IN LOADING MACHINE 3-110
5.4 CAUTIONS DURING TRANSPORTATION 3-110
6. HANDLING IN COLD WEATHER 3-111
6.1 PREPARING FOR LOW TEMPERATURE 3-111
7. LONG-TERM STORAGE 3-113
7.1 BEFORE STORING MACHINE 3-113
7.2 DURING STORAGE 3-113
7.3 AFTER STORAGE 3-113
8. HANDLING BATTERY 3-114
8.1 CAUTIONS IN HANDLING BATTERY 3-114
8.2 REMOVING/INSTALLING BATTERY 3-115
8.3 CAUTIONS IN CHARGING BATTERY 3-116
8.4 STARTING ENGINE WITH BOOSTER CABLE 3-117
9. TROUBLESHOOTING 3-119
9.1 ELECTRICAL COMPONENTS 3-119
9.2 MACHINE BODY 3-120
9.3 ENGINE 3-121
INSPECTION AND MAINTENANCE 4- 1
1. PRECAUTIONS FOR MAINTENANCE 4- 2
2. BASIC MAINTENANCE 4- 4
3. LEGAL INSPECTION 4- 6
4. CONSUMABLES 4- 6
5. LUBRICATING OIL 4- 7
5.1 USE OF LUBRICATING OIL ACCORDING TO TEMPERATURES 4- 7
6. ACCESSORY TOOLS AND STANDARD TIGHTENING TORQUE 4- 8
6.1 ACCESSORY TOOLS 4- 8
6.2 STANDARD TIGHTENING TORQUE LIST 4- 8
7. INSPECTION AND MAINTENANCE LIST 4-10
8. MAINTENANCE PROCEDURES 4-12
8.1 INITIAL 10 HOUR MAINTENANCE 4-12
8.2 INITIAL 50 HOUR MAINTENANCE 4-12
8.3 INITIAL 250 HOUR MAINTENANCE 4-12
8.4 CHECKING BEFORE OPERATION 4-12
8.5 IRREGULAR MAINTENANCE 4-13
8.6 MAINTENANCE EVERY 30 HOURS 4-22

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ITEM Page
8.7 MAINTENANCE EVERY 50 HOURS 4-24
8.8 MAINTENANCE EVERY 250 HOURS 4-28
8.9 MAINTENANCE EVERY 500 HOURS 4-32
8.10 MAINTENANCE EVERY 1000 HOURS 4-36
8.11 MAINTENANCE EVERY 1500 HOURS 4-45
8.12 MAINTENANCE EVERY 2000 HOURS 4-45
SPECIFICATIONS 5- 1
1. SPECIFICATION LIST 5- 2
2. SPECIFICATION DIMENSIONAL DRAWING 5- 4
3. DIMENSIONAL DRAWING OF OUTRIGGER WIDTH 5- 5
4. RATED TOTAL LOAD TABLE 5- 6
5. WORKING RADIUS AND LIFTING HEIGHT 5- 9
INTERACTIVE REMOTE CONTROL 6- 1
1. OUTLINE OF REMOTE CONTROLLER 6- 2
1.1 FEATURE 6- 2
1.2 CONFIGURATION 6- 2
1.3 FUNCTIONS OF REMOTE CONTROL SYSTEM 6- 3
2. SAFETY PRECAUTIONS 6- 4
2.1 For Safety Operations 6- 4
2.2 PRECAUTIONS FOR CRANE OPERATION 6- 6
2.2.1 PRIOR TO STARTING ENGINE 6- 6
2.2.2 SUBSEQUENT TO STARTING ENGINE 6- 7
2.2.3 TERMINATING THE OPERATION 6- 7
3. LOCATIONS OF SAFETY LABELS 6- 8
4. COMPONENTS OF THE TRANSMITTER 6-10
5. COMPONENTS OF THE RECEIVER 6-16
5.1 COMPONENTS OF THE RECEIVER 6-16
5.2 FUSE IN THE RECEIVER 6-18
6. SETTING UP OPERATION MODES OF TRANSMITTER 6-20
6.1 A MODE 6-20
6.1.1 OPENING A MODE SCREEN 6-20
6.1.2 MESSAGES IN THE A MODE SCREEN 6-20
6.1.3 AN EXAMPLE FOR SETTING IN THE A MODE 6-24
6.2 PROCEDURE IN THE OPERATION MODE 6-25
6.2.1 CALL OUT CRANE MODE 6-25
6.2.2 CALL OUT OUTRIGGER MODE 6-26
7. CHECKING BEFORE OPERATION 6-28
7.1 CHECKING BEFORE STARTING ENGINE 6-28
7.1.1 CHECKING BEFORE TURNING ON THE TRANSMITTER 6-28
7.1.2 CHECKING AFTER TURNING ON THE TRANSMITTER 6-29
7.1.3 CHECKING RECEIVER 6-32
7.2 CHECKING AFTER STARTING ENGINE 6-33
7.2.1 VERIFICATION FOR THE ENGINE START AND STOP 6-33
7.2.2 CHECKING “OUTRIGGER MODE” OPERATION 6-34
7.2.3 CHECKING “CRANE MODE” OPERATION 6-36

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ITEM Page
8. OPERATION 6-39
8.1 CAUTIONS BEFORE OPERATION 6-39
8.2 OPERATION IN OUTRIGGER MODE 6-40
8.2.1 OUTRIGGER SETTING 6-41
8.2.2 OUTRIGGER STOWAGE 6-42
8.3 OPERATION IN CRANE MODE 6-43
8.3.1 SLEWING OPERATION 6-44
8.3.2 BOOM TELESCOPING 6-44
8.3.3 HOOK RAISING AND LOWERING 6-45
8.3.4 BOOM DERRICKING 6-45
8.3.5 AUTOMATIC HOOK STOW FUNCTION 6-46
8.3.6 SET-UP AND CANCEL MICRO SPEED AND ENHANCED SPEED MODE 6-47
8.3.7 ENGINE STOP AND EMERGENCY STOP PROCEDURE 6-49
8.3.8 ENGINE START AND RESET PROCEDURE 6-49
8.4 CHECKING AFTER CRANE OPERATION 6-50
9. TROUBLE SHOOTING 6-51
9.1 BEFORE THE TROUBLE SHOOTING 6-51
9.2 ERRORS IN THE REMOTE CONTROL DEVICES 6-52
10.SYSTEM SPECIFICATIONS 6-54
ENGINE AND ELECTRIC MOTOR SPECIFICATIONS 7- 1
1. PRECAUTIONS (FOR ENGINE AND ELECTRIC MOTOR SPECIFICATION) 7- 2
2. SAFETY LABEL LOCATIONS 7- 3
3. MACHINE EACH SECTION 7- 5
3.1 MACHINE EACH UNIT 7- 5
3.2 TRAVELING AND CRANE OPERATION UNITS 7- 6
3.3 INSTRUMENT PANEL SECTIONS 7- 7
3.4 POWER UNIT 7-10
3.5 POWER SUPPLY BOX 7-10
3.6 INVERTER UNIT 7-11
4. OPERATION 7-14
4.1 CHECKING BEFORE OPERATION 7-14
4.1.1 CHECKING BEFORE STARTING ELECTRIC MOTOR (VISIBLE CHECKS) 7-14
4.1.2 CHECKING BEFORE STARTING ELECTRIC MOTOR 7-14
4.1.3 CHECKING AFTER STARTING ELECTRIC MOTOR 7-14
4.2 POWER SUPPLY CONNECTION 7-15
4.3 OPERATION AND CHECKING AFTER POWER CONNECTION 7-17
4.4 MACHINE OPERATION 7-19
4.5 MACHINE STOP AND CHECKS AFTER STOPPING MACHINE 7-19
4.6 POWER SUPPLY SEPARATION 7-20
5. LONG-TERM STORAGE 7-21
6. ELECTRIC MOTOR TROUBLESHOOTING 7-22
7. PRINCIPLE SPECIFICATION LIST 7-23
8. SPECIFICATION DIMENSINAL DRAWING 7-24

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ITEM Page
SEARCHER HOOK 8- 1
1. SEARCHER HOOK EACH SECTION 8- 2
2. MOMENT LIMITER DISPLAY UNIT 8- 4
3. OPERATION 8- 6
4. INSPECTION AND MAINTENANCE 8- 8
4.1 LEGAL INSPECTION 8- 8
4.2 CONSUMABLES 8- 8
4.3 INSPECTION AND MAINTENANCE LIST 8- 8
4.4 MAINTENANCE PROCEDURES 8- 9
4.4.1 INSPECTION OF BEFORE OPERATION 8- 9
5. WORKING RADIUS AND RATED TOTAL LOAD 8-11
5.1 WORKING RADIUS AND LIFTING HEIGHT FOR SEARCHER HOOK 8-11
5.2 RATED TOTAL LOAD CHART FOR SEARCHER HOOK 8-12
850kg SEARCHER HOOK 9- 1
1. SAFETY DECAL LOCATIONS 9- 2
2. SEARCHER HOOK EACH SECTION 9- 5
3. MOMENT LIMITER DISPLAY UNIT 9- 6
4. OPERATION 9-10
5. INSPECTION AND MAINTENANCE 9-14
5.1 LEGAL INSPECTION 9-14
5.2 CONSUMABLES 9-14
5.3 INSPECTION AND MAINTENANCE LIST 9-15
5.4 MAINTENANCE PROCEDURES 9-16
5.4.1 INSPECTION OF BEFORE OPERATION 9-16
6. WORKING RADIUS AND RATED TOTAL LOAD 9-18
6.1 WORKING RADIUS AND LIFTING HEIGHT FOR SEARCHER HOOK 9-18
6.2 RATED TOTAL LOAD CHART FOR SEARCHER HOOK 9-20

1-1
INTRODUCTION
1. INTRODUCTION 1- 2
2．FOR SAFE USE OF MACHINE 1- 3
3. MACHINE OVERVIEW 1- 4
4. QUALIFICATION FOR OPERATION 1- 6
5. TERMINOLOGY 1- 7

1-2
1. INTRODUCTION
Thank you for purchasing our Mini Crawler Crane “MC-305C-2”.
This manual is a guidebook for safe and effective use of this machine.
This manual describes the procedures for proper operation and maintenance of the machine.
Warnings and precautions defined in this manual shall be observed for safety.
Many of the accidents are caused by the operation, inspection, or maintenance that does not
observe the basic precautions.
Be sure to read this manual and understand the procedures for machine operation,
inspection, and maintenance thoroughly before performing operation of this machine.
Failure to observe the basic precautions defined in this manual may lead to hazardous
accidents.
Failure to use this machine properly can lead to serious personal injury or death.
Operators and maintenance personnel must always read this manual prior to
operation or maintenance of this machine.
Save this manual at a designated place for reference when necessary. All personnel
who work on this machine are to carry out periodic reference.
•Only those who have thorough understanding of the fundamental procedures
provided in this manual are qualified to perform machine operation.
•Keep this manual handy for reference when necessary.
•Should you lose or damage this manual, contact Maeda or our sales service
agency immediately for ordering a new manual.
•This manual should always accompany this machine upon transfer of the machine
to the next owner.
•This manual has adopted data that was available at the time of the creation of the
manual.
The contents of this manual, including maintenance specifications, tightening
torque, pressure, measuring method, adjustment value, and illustrations, are
subject to change upon unremitting refinement of the machine, without notice.
Machine maintenance may be susceptible to revisions. Always obtain the latest
information from Maeda or our sales service agency before performing
maintenance of this machine.
For safety instructions, see “2. For Safe Use of Machine” on page 1-3 and “Safety”
on page 2-1.

1-3
2. FOR SAFE USE OF MACHINE
This manual classifies the risks into the following three categories to present the details of the safety
labels in easy-to-understand manner.
This denotes that there is an imminent hazard which will cause serious
personal injury or death.
The method of hazard circumvention is stated.
This denotes that there is a hazard which can cause serious personal injury
or death.
The method of hazard circumvention is stated.
This denotes that there is a potential hazard which may cause minor or
moderate personal injury or serious damage to this machine.
The method of hazard circumvention is stated.
This manual also provides the following to indicate what must be observed for the sake of the machine
and what will be of help.
This denotes that failure to handle the machine properly may damage the
machine or shorten its life.
This denotes helpful information.
Not only procedures for operation, inspection, and maintenance of this machine described in this manual
but also safety precautions should pertain to the case where this machine is only used for specified tasks.
Every circumstance incidental to use of this machine is unforeseeable, and therefore, cautions given in
this manual and on this machine do not necessarily cover every safety-related issue.
Necessary safety actions should be taken under your responsibility if operation, inspection, and
maintenance in a situation that is not described in this manual are performed.
Even in the above case, never attempt the works and operations this manual prohibits you to do.
CAUTION
NOTES

1-4
3. MACHINE OVERVIEW
3.1 SPECIFIED OPERATIONS
This machine is to be used for operation listed below.
•Crane operation
This machine is a mobile crane with a rubber track traveling dolly (carrier) mounted with a boom crane.
This self-propelled crane is capable of moving (traveling) in the worksite and craning an object weighing
within the rated total load.
This is also a remote-controlled crane.
3.2 MACHINE CONFIGURATION
(1) Traveling dolly
(2) Crane
(3) Safety device
Viewed from the operation seat, the front, back, left, and right of the
machine are determined in this manual, viewing in the traveling
direction (front) of the machine.
Boom slewing motion is determined with the machine viewed from
immediately above; slew clockwise denotes right-handed motion and
slew counterclockwise denotes left-handed motion.
EXTERNAL VIEW

1-5
This machine is composed of the units listed below.
[1] TRAVELING DOLLY
This is composed of a traveling gear, engine, traveling operation unit, and crane operation unit.
[2] CRANE
This is composed of a telescoping system, derrick system, hook block, winch system, and outrigger
system.
[3] SAFETY DEVICE
This is composed of the following parts and devices: Over hoist detector / automatic stop device,
three-winding stop alarm / automatic stop device, load indicator, hydraulic safety valve, hydraulic
automatic locking device, slinging rope detachment protector, alarm buzzer, audio alarm, level, crane
tip-over alarm (an alarm issued in the event of the crane operation at 3-degree inclination and traveling at
15-degree inclination), traveling lever lock, traveling/crane/outrigger selector switch (designed to prevent
the machine from craning at traveling), outrigger safety device (outrigger interlock and crane interlock),
moment limiter (working envelope limited), working status lamp, outrigger non-installation warning lamp.
3.3 MACHINE FUNCTIONS
[1] TRAVELING DOLLY
• This is a compact machine designed to keep the overall width between the crane and outrigger
minimized with them housed (in traveling position).
This compact design is ideal for work in confined areas.
• Two-traveling lever operation enables not only direction changes among forward, backward, and
right/left but pivot turn and spin turn.
[2] CRANE
• An automatic slide outrigger is embedded in the crane to permit outrigger extension and grounding from
the operation seat.
• Through the combined use of telescoping, derricking, and slewing besides winch system operation, the
crane is capable of raising or lowering the hook block and moving an object weighing within the rated
total load to a designated position within the confines of the working envelope.
• Remote-control units allow remote outrigger setting and remote crane operation.

1-6
4. QUALIFICATION FOR OPERATION
•A high incidence of occupational accidents in crane operation has been reported.
Be aware that experienced engineers are also no exception.
•Warnings and precautions defined in this manual shall be observed for safety assurance
during operation of the machine.
4.1 QUALIFICATION FOR CRANE OPERATION
Only personnel that have obtained the license stipulated by laws and regulations applicable to the place of
use are qualified to operate this machine.
Contact the relevant government office or our sales service agency for further information.

1-7
5. TERMINOLOGY
5.1 DEFINITIONS OF TERMS
[1] RATED TOTAL LOAD
This is the maximum load that can be applied according to a boom
length and angle. The load includes the mass (weight) of hoisting
accessories (hooks) and slinging ropes.
[2] RATED LOAD
This is a load derived by subtracting the mass (weight) of hoisting
accessories (hooks) and slinging ropes from the rated total load,
which is a withstand load for hoisting.
[3] WORKING RADIUS
This is a horizontal distance between the axis of slewing and the
hook center.
[4] BOOM LENGTH
This is a distance between the boom primary pin and the sheave
pin of the end boom.
[5] BOOM ANGLE
This is an angle which the boom forms with the horizon.
[6] LIFTING HEIGHT ABOVE GROUND
This is a vertical distancebetween the hook bottom and the ground
with the hook raised until the upper limit.

1-8
5.2 DIAGRAM OF WORKING RADIUS AND LIFTING HEIGHT
・ The working radius/lifting height diagram indicates the relation between the working radius,
boom angle and lifting height above ground of this machine, without any load suspended.
・ “5.575m Boom” in the working radius/lifting height diagram shows the status where one half
of first
mark is extended from the second stage boom.
・ “7.075m Boom” in the working radius/lifting height diagram shows the status where one half
of second mark is extended from the second stage boom.
1. Point A denotes a boom angle and point B denotes a lifting
height above ground in the figure at right.
The same working radius is applied to points A and B.
2. The “diagram of working radius and lifting height” shows the
relationships the working radius, boom angle, and lifting
height at no load, allowing for no deflection in the boom.
A deflection occurs in the boom when an object is hoisted,
which causes the working radius to widen slightly.
The rated total load decreases with increase in the working
radius. Actual crane operation requires the planning of work,
allowing for sufficient clearance more than that provided in
the diagram.

1-9
5.3 RATED TOTAL LOAD CHART
Rated total load chart is based on level, hard ground. Depending on the outrigger setting or
ground conditions, machine may tip over.
Rated total load chart is based on working radius with bending of boom and lifted load
taken into consideration.
If boom e is extended to any extent, work should be performed within the capacity for
“5.575m Boom”.
When more than one half of the first
mark is exposed from the boom (2), work should be
carried out within the performance for the “7.075m Boom”.
When more than one half of the second
mark is exposed from boom (2), work should be
carried out within the performance for the “8.575m Boom”.
If working radius exceeds the value of Working Radius column in the chart by any extent,
work should be performed within the rated total load in the next column of Working Radius.
Rated total load is shown with the mass of hook (20kg) included.
Unless outrigger is extended to maximum, work should be performed in accordance with
the “Rated Total Load Chart without extending outrigger to maximum”.

1-10
The rated total load chart provides the maximum loads that the crane is capable of hoisting objects in
parallel with the length of the boom. The loads are specified by working radius.
[1] BOOM LENGTH
The following figures illustrate the condition of the booms, “Boom (1)”, “Boom (1) + (2)”, “Boom (1) + (2) +
(3)”, “Boom (1) + (2) + (3) + (4)”, and “Boom (1) + (2) + (3) + (4) +(5)” in the preceding boxes in the rated
total load chart.
1. “Boom (1)”: All the booms are retracted.
2. “Boom (1) + (2)”: With booms (3), (4), and (5) retracted, boom (2) is fully extended.
“Boom (1) + (2)” is to apply to crane operation with boom (2) extended even if only slightly.
3. “Boom (1) + (2) + (3)”: With booms (4) and (5) retracted, booms (2) and (3) are fully extended.
“Boom (1) + (2) + (3)” is to apply to crane operation with boom (3) extended even if only slightly.

1-11
4. “Boom (1) + (2) + (3) + (4)”: With booms (2) and (3) fully extended, booms (4) and (5) are extended
midway (half of the “ mark” passes boom (3)).
“Boom (1) + (2) + (3) + (4)” is to apply to crane operation with booms (4) and (5) extended even if only
slightly.
5. “Boom (1) + (2) + (3) + (4) + (5)”: All the booms are fully extended.
“Boom (1) + (2) + (3) + (4) + (5)” is to apply to crane operation with half of the “ mark” on boom (4)
passes boom (3).

1-12
[2] OUTRIGGER MAXIMUM EXTENSION
•Make sure all the outriggers are placed properly before performing crane operation.
This machine features a safety-interlock system that prevents crane operation unless all the
lamps, other than the boom retraction lamp on the outrigger monitor, are on.
• Always place the machine in a horizontal position with the use of the level when extending the
outriggers. A warning buzzer sounds when the machine is inclined 3° or more and stops when
the machine is placed in a horizontal position.
•When the crane is used with the outriggers extended other than at the maximum, crane
operation should proceed with respect to the values specified in the rated total load chart
corresponding to “When the crane is used with the outriggers extended at the
minimum/midway”.
Failure to perform crane operation with proper values may cause the machine to topple over.
Exercise caution when performing operation.
• Despite the maximum extension of all the outriggers, the
width of extended outriggers decreases due to an
ungraded ground even when clearance "a" in the right
figure is 50 mm.
Crane operation should proceed with respect to the
values specified in “When the crane is used with the
outriggers extended midway” in the rated total load
chart.
•The machine becomes unsteady at some point if it
undergoes a 360-degree slewing with an object hoisted.
Irrespective of the rated total load, ensure operation in a
short working radius and at low speed.
The figure shown at right represents the condition “When the crane
is used with the outriggers extended at the maximum” in the rated
total load chart.
Ensure that all the lamps, other than the boom retraction lamp on
the outrigger monitor, are on.
If the inner box is retracted even if only slightly, crane operation
should proceed with respect to the values specified in the rated
total load chart corresponding to “When the crane is used with the
outriggers extended at the minimum/midway”.
See "OPERATION 2.14 OUTRIGGER SETTING OPERATION” for
proper setting of the outriggers.
NOTES
Outrigger maximum extension is defined as that:
1. The outrigger is set at the positioning pin position (40° front,
30° back).
2. The inner box of all the outriggers is extended fully.
3. All the outriggers are placed on a level surface.
4. Approx. 50mm is assured for clearance "a” (between the
outrigger bottom and crawler bottom) in the figure at right.