7250-2F

HYDRAULIC CRAWLER CRANE
Crawler Crane
Max. Lifting Capacity:

250t at 4.6m
Luffing Tower
Max. Lifting Capacity:

25t at 18.0m

Technology and Power,
KOBELCO Takes Pride In
Hydraulic Crawler Crane 7250
Now Ready to Launch
Kobelco's hydraulic crawler crane 7250
has taken advantage of new technologies
to raise its performance to new heights.
Precision and high-elevation crane jobs
depend on accuracy and speed, whereas
heavy-lifting depends on trustworthy power and strength.
The perfect answer comes in our new7250. Hoist winches with powerful linepull are designed to handle the toughest
jobs. Large drum capacities combinedwith a new hydraulic system promote ultra-smooth operation. Excellent transportation features enable cost saving.
Of course, Kobelco is renowned for its engineered technology backed with longand worldwide experience, therefore productivity-boosting technical advances canbe found everywhere. With the lifting performance, transportation features, smooth
control functions, safety features, also
durability and reliability, the 7250 canhandle and satisfy all types of crane jobs.
Kobelco is proud to announce the new7250 crawler crane.

1Hydraulic Crawler Crane 7250
5 Major Features

1. Massive and Versatile
Lifting Performance
2. Smooth Operation and Control
3. Excellent Cab with Enhanced Functions
4. Excellent Transportability and Assembly
5. Safe,Environmentally-Conscious
DesignPhotos in this catalogue may include optional items.

2For both high and heavy lifting

Massive and Versatile Lifting Perf
Large Lifting Capacity
Max. lifting capacity

250t at 4.6m
76.2m
Max. crane boom lengthLong Boom Configuration toAchieve Wide Working Ranges
The long boom specification provides a wider operating
range with plenty of lifting capacity. The long boom can bemade up of insert boom and tower insert jib, to make economic use of attachment components.
Long boom length

73.2m to 91.4m
3.2t at 78.1m

Lifting capacity at the max. working radius(Using the 88.4m long boom)

Large Working Ranges with Fixed Jib Configuration
The fixed jib specification have allowed work in higher
and deeper sites.
MaximumMax.
combinationlaffing tower(crane+ towerboom jib+ fixedlengthjib)

76.2m + 30.5m2.4t at 88.0m

Lifting capacity at the max working radius

3formance
High-Output Engine

High-Speed Lifting Increases Work Efficiency

The engine has an impressive rated output of 247 kW andcomplies with NRMM (Europe) Stage IIIA and US EPA
Tier III exhaust emissions regulations. All of this power
works with KOBELCO’s unique Engine Speed Sensing(ESS) control system and new hydraulic systems to ensure stable and smooth simultaneous operations.

The main and auxiliary winches deliver a fast maximum
hoisting and lowering speed of 110 m/min that improves
operational efficiency on high-rise jobs.

Engine output

247 kW

Meets NRMM (Europe) Stage IIIA

Max. line speed

110m/min(First layer)
New Crawler Design Improves Performance
Large crawlers have been
added to further improvestability, while keeping
the tail swing radius tojust 5,850 mm. The result
is a machine with great
lifting capacity that canoperate in a minimum ofonsite space.

High-Performance Winches Accommodate a Wide Range of Jobs
Choice of Two Types of Winch
The 7250 features non free-fall winches as standard thatprovides constant hydraulic power to the winches to prevent accidental free-fall through operator error. An optional free-fall winch (with wet-type disc brake) is also available, which delivers highly reliable performance for material handling and general foundation work.

Non Free-fall Winch (Standard)
Winch drum

Hydraulic motor

The winch shown in this photo is for tower jib specification.

Wide and Large Capacity Winches
The wide hoist winches provide an impressive spooling
capacity of 53 m on the first layer with φ28 mm hoistrope. Their large capacity and large diameter help to prevent uneven spooling and wear while ensuring smooth
operation when using a long boom for high-rise work.
Spooling capacity (first layer)

Wet-Type Disc Brake System (Optional)
Disc brake

Hydraulic motor

Winch drum

Reduction unit

53m

Winches with a Powerful Line Pull Handle
Hard Work with Ease
Through the efficient match-up of a high-output engine
and high-performance hydraulic motors, the winches deliver plenty of line pull for single-line work. There’s also
ample capacity for heavy loads when they first clear theground, and other tough jobs.
Rated line-pull (main/aux.)
Single line

Reduction unit

132kN {13.5tf}

KOBELCO’s new oil-cooled wet-type multi-disc brakesystem is first in its class and provides quiet, dependable braking power. The multiple discs are self-adjusting and self-equalizing. Forced-oil circulation keeps
brake temperatures cooler during long, continuous operations and ensures smooth braking. The completely
enclosed system eliminates the possibility of outsidecontamination, providing years of problem-free service
life. In optional free-fall mode, the brake pedal is easily
depressed to reduce operator fatigue.
4For greater work efficiency

Smooth Operationand Control
New Hydraulic System Improves Simultaneous Operations
In case of luffing tower operation, the aux winch is used
for jib hoisting. And the line speed reduction occurs bymain hoist·lower and jib hoist·lower combined operation
due to hydraulic pressure interference with conventional
series hydraulic circuit (conflux hydraulic circuit).
The 7250 adopts one-pump to one-motor system (independent hydraulic circuit) for main, aux hoist and boomhoist. This is completely interference-free hydraulic circuit
to perform smooth combined operation of main, aux,
boom and jib hoist·lowering without any shocks and speed
reduction in all ranges of winch speed and load condition.

New hydraulic system
Main hoist
Aux. hoist(Tower jib hoist)

Pump

EnginePump

Boom independent pump

Selectable Swing Modes to Match the Job at Hand
Free Swing Mode (High/Low):
This mode is designed for material handling and other cycle-duty operations that require consecutive swing cycles. The swing is completely free and can be operated at
High or Low speed to suit job requirements.

Neutral Brake Swing Mode:
When the crane is working on a slope in Free Swing Mode, it may swing in an unintended direction as soon as the swing parking brake is released. To prevent this, theNeutral Brake Swing Mode reduces operating speeds by lowering the flow of oil in
the hydraulic circuit, thus making swing starts and stops easy to control when working on a slope or in windy conditions.
Swing speed is also reduced in this mode to prevent the load from moving sideways.

Direct control
Control
Leverslever
Connected
connection
Directlyto Pilot
to Pilotvalve
Valvesfor smoothfor Smooth
operation.
Operation
The control levers regulate the pilot valves directly to reduce the amountof play and ensure smooth, precise hoisting start-ups and inching. Control is light and sure, with almost no clatter even over long operating periods.

Winch Speed Controller
The speeds of the mainwinch, auxiliary winch andboom hoist can be set independently with trimmer controls.
Hydraulic pilot system detects swing reaction force.
Electric throttle with a twist grip ensures sensitive engine control.

Red switch on the boom lever grip allows easy inching control for hoist, boom hoist, and travel. Theoperator can activate it without taking his hands offthe boom hoist lever.

The drum turning sensor enables sensing start ofhoisting and lowering (main and aux winches only) bytouching the top of the hoisting lever grip (optional).

5Boom

For better man-machine communication

Excellent Cab
with Enhanced Functions
Multi-Function LMI Display

Multi-Display

The newly designed load moment indicator (LMI) system features a large, easy-to-read LCD display. The
rated load, actual load, load ratio, and other information
are displayed in large characters. Warnings and otheritems are displayed in color, and text
messages and alarms alert the operator
to prevent dangerous conditions fromdeveloping. Other information can also
be displayed, including a rated load
chart and rated load curve, in addition
to a function that regulates the working range.

The easy-to-read LCD multi display
provides information on the current
status of such functions as engine
rpm, maintenance, and on-board
trouble-shooting, so that the operator has an ongoing, real-time assessment of the machine’s condition at a glance.
Normal Displays• Engine speed (Lifting height*1)• Engine oil change interval• Reeving number for main/aux winch wire rope
• Low-speed switch status• Wind speed*2* 1 With the optional lifting height gauge installed* 2 With optional anemometer installed

Warning Displays• Warning(malfunction, maintenance information, etc.)• Self-diagnostic function(detects malfunctions in solenoid valves, sensors, etc.)• Over-load alarm
display• Working area
display

Comfortable 940mm-Wide Cab
Air conditioner
Fully adjustable, high backed seat with a headrest
and armrests
Intermittent wipers and window washers
Sun visor
Roof blindClear, Panoramic View
The 7250 has a new cabindesign with sash-less front
and top glass that provides a
panoramic frontward andskylight view. The glass also
has less curvature to minimize distortion. The front upper window has been broadened on both sides for aview that is 31% wider thana conventional cab, while
the top-window view is widened toward the rear.

Visual comparison of new and conventional cabs

New cab

Conventional cab
44º

42º6

To ensure safe assembly and increase actual working hours

Excellent Transportability
and Assembly
Base Machine Width of 3.2m (without Boom Base) and 3.4m (with Boom Base)
Swing Cab

Transport with Boom Base

The cab can beeasily turned byhand toward thefront of the machineduring transportation so that the upper machinery fits
within a width of
3.2m. This enables
the machine withaxles to be transported on a trailer.

It is also possible to transport with boombase. The width and weight is within 3.4m
and 44.5t. This eliminates installation ofboom base and boom hoist rope in jobsite,
swiftly ready for job.

3,200mm3,400mm3,400mm

5,750mm16,175mm

Light and Compact Super-Structures

Boom Assembly/Disassembly Mode

The boom hoist winch is pin-connected to upper
structure for easy assembly and disassembly fortransportation. The new and unique upper structure
design provides the benefit of light and compact
base machine good for transportation.

The boom assembly/disassembly mode, which isused to release the over-hoist prevention function tofacilitate boom assembly and disassembly, is activated with a switch located under the multi-function
LCD display of the load moment indicator (LMI).
(This switch is different from the switch that releases
the auto-stop functions for over-load and hook overhoist.) When the boom is lifted to a certain angle, it isautomatically deactivated and the LMI function is automatically re-engaged to ensure that the boom assembly/disassembly function is used only when needed.

Gantry compression member

Boom back stops

Unique upper structure design(1) Location of gantry compressionmember foot.
(2) Complete separation of boom backstops from upper structure.

7

Nesting Boom Design
The tower insert jib can be easily
nested in the insert boom by using the optional stowing guide rollers. This reduces the number oftrailers needed for transport andhelps to minimize required storage space.

Cranee boom

Faster Attachment Assembly and Disassembly
A variety of new mechanisms greatly reduce the time needed to assemble attachments. This results in lower laborand assist-crane costs, and greater productivity on the job.

The stowing bracket makes securely tighten theguy cables on to boom inserts for transportation. This also ensures that the guy cables arecorrectly installed during assembly (optional).

The upper spreader stowing guidemakes it easy to connect guy cables.

The boom connector pin holder prevents the loss ofboom connector pins during assembly/disassemblyand transportation.

The rail for the luffing tower jib upperspreader, installed at the back of the insert
boom, enables the spreader to move without the assist crane when assembling.

The foldable strut with asupport makes easy assembly of strut on ground.

Saving Storage
and Transport Costs
through the Common Useof Boom and Jib
The 7250 features an innovative boom design to enhance
lifting performance. The common use of the boom and jib
reduces labor when changing
configurations and saves storage and transport costs.

30' special
insert boom
for tower

Fixed jibLong boom

Tower jib

Boom baseInsert boom
Tapered insert boom
Boom top
Tower insert jib
Tower jib top
Relay jib8No compromise in KOBELCO’s safety policy

Safe, Environmentally-Conscious
Two-Stage System to Prevent Boom and Jib
Over-Hoists

Automatic Stop Release Switch
with Safety Function

With primary and secondary over-hoist prevention devices, this new safety system can prevent boom over-hoist
at two stages. The primary stop function is activatedwhen the boom or tower approaches the critical angle-toground during hoisting. This new system monitors the angle-to-ground of the boom, tower or tower jib with a sensor, and swiftly alerts the operator of danger. For the tower, the angle-to-machine is also monitored at this stage.
The secondary stop function uses a device that monitors
the angle-to-machine of the boom, tower, or tower jib
through a limit switch fitted to the boom and jib backstops. It stops the machine automatically to prevent itfrom working outside of the safety range, and once activated it cannot be cancelled.

The automatic stop system prevents over-load, hookover-hoist and boom over-hoist. To deactivate the system, a two-stage release procedure is employed thatuses a master key and separate switches. This makes
it easy to supervise the use of the single key and prevent unauthorized release of the automatic stop system.

Other Safety Features
Swing flashers and warning buzzer warn surrounding workers
when the machine is swinging.
Function lock lever helps prevent accidental operation when theoperator enters or leaves the cab.
Directional markings on the crawlers make it easy to see which direction the crawlers will move.
One-way call supports the safety of onsite personnel (optional).
External lamp for over-load alarm notifies surrounding workers of
the load condition (optional).
Cameras and color monitor provide views of the rear of the machine, the main and auxiliary winches, and the boom hoist winch(optional).

Angle to the machine
Angle to the ground• Directional marking

Automatic Soft-Stop Function
Reduces Shocks
This function is activated automatically when boom or
tower jib lowering, or boom hoisting is stopped by theover-load prevention system and over-hoist prevention
system. It makes for a smooth stop and reduces dangerous swinging of the load.
9• One-way call (optional)• Function lock lever

DesignSide-Engine Layout forEasy MaintenanceA new engine layout on the side of the machine provides easy access for routine inspections and servicing. Maintenance crews
can access the entire power plant just by
opening the side door.

Super Fine Filter, a Long-Life Filter for Hydraulic Oil
The large-capacity, super-fine filter is made of ahigh-performance filter medium consisting of glass
fiber reinforced with steel wires. The replacement
cycle is extended to four times longer than that ofconventional filters to reduce lifelong operating
costs.
Photomicrograph (x250)• Super fine filter(glass fiber)• Conventional filter(paper fiber)Complying with Worldwide Exhaust Gas Regulations
Adopting the low pollution engine, the 7250 meets NRMM(Europe) Stage IIIA exhaust emissions regulations andU.S. EPA tier III.

Complying with Japanese Noise Regulations
The 7250 is designed with advanced Kobelco low noise
construction technologies, as specified by the Japanese
Ministry of Land, Infrastructure and Transport.

10Main Specifications (Model: 7250-2F)
Crane Boom
Max. Lifting Capacity
Max. Length

Working Speed
250 t/4.6 m

Swing Speed

2.2 min-1 {rpm}76.2 mTravel Speed

1.1/0.7 km/h

Power Plant

Long Boom
Max. Lifting Capacity
Max. LengthModel

37.5 t/14.4 m

Hino P11C-UN
247 kW/2,000 min-1 {rpm}Engine Output

91.4 mFuel Tank Capacity

Fixed Jib

400 liters

Max. Lifting Capacity

22.7 t/15.0 m

Hydraulic System

Max. Combination

76.2 m + 30.5 m

Main Pumps

4 variable displacement

Max. Pressure

31.9 MPa {325 kgf/cm2}

Tower Jib
Max. Lifting Capacity

25 t/18.0 m

Max. Combination

64.1 m + 51.8 m

Tower Angle

Hydraulic Tank Capacity
Weight60°~90°Main & Aux. Winch
Max. Line Speed
Rated Line Pull (Single Line)

600 liters

Operating Weight*

Approx. 211 t

Ground Pressure*

122 kPa {1.25 kgf/cm2}

Counterweight

110 m/min (1st layer)
132 kN {13.5 tf}

97.1 t (Upper), 20.0 t (Lower)

Transport Weight**

Wire Rope Diameter

28 mm

Wire Rope Length

390 m (Main) 220 m (Aux.)

Brake TypeSpring-set hydraulically released (Negative)

Free-Fall Brake Type

Wet-type multiple disc brake (Optional)

44.5 t* Including upper and lower machine, 97.1 ton counterweight and 20.0 ton carbody
weight, basic boom, hook, and other accessories.
**Base machine with boom base, carbody, gantry, trans-lifter, lower spreader, upper spreader,main and aux. winches including wire rope, and boom hoist winch including wire rope.
Units are SI units. { } indicates conventional units.

General Dimensions (Unit:mm)
1,400

3,770

2,525

Cr
ane

8,930

boom

lengt

h:15.2-76.

2mR5,850

7,895
8,970

Note: This catalog may contain photographs of machines with specifications, attachments and optional equipment not certified for operation in your country.
Please consult KOBELCO for those items you may require. Due to our policy of continual product improvements all designs and specifications are subject tochange without advance notice.
Copyright by KOBELCO CRANES CO., LTD. No part of this catalog may be reproduced in any manner without notice.

Inquiries To:
17-1, Higashigotanda 2-chome, Shinagawa-ku, Tokyo, 141-8626 JAPAN
Tel: +81-3-5789-2130 Fax: +81-3-5789-3372

KOBELCO is the corporate mark used by Kobe Steel on a variety of products
and in the names of a number of Kobe Steel Group companies.

Bulletin No. 7250-2F-AO1

060901F Printed in Japan