A used Kato SR Series rough terrain crane can be a practical choice for construction, plant maintenance, infrastructure and lifting work where maneuverability and off-road capability matter. However, the correct SR model should not be chosen from maximum tonnage alone. A crane rated at 30, 51 or 70 tonnes cannot lift that load at every boom length or working radius.
Before buying, define the load weight, working radius, required lifting height, available outrigger space and jobsite conditions. Then match those requirements to the exact Kato SR model and load chart. Used buyers should also inspect the boom, jib, wire ropes, winches, hook blocks, outriggers, hydraulics, slewing system, ACS safety system, tires, steering, brakes and maintenance history. This guide explains how overseas buyers can compare Kato SR Series cranes before purchasing from Japan.
What Is the Kato SR Series?
Kato's SR Series consists of rough terrain cranes designed for lifting work on construction and industrial jobsites.
Current and recent models include machines such as:
- SR-300LX
- SR-300R
- SR-500L
- SR-500LX
- SR-700LⅡ
- SR-800L
Older Japanese used machines can also include SR-250R, SR-250Ri, SR-250Rf and other previous generations.
The important point is that “SR Series” describes a family, not one crane specification.
Specifications vary by model year and configuration. Exact specifications should be confirmed for each individual machine.
A Quick Guide to Current Kato SR Models
| Model | Maximum Lifting Capacity | Boom Length | Maximum Outrigger Width |
|---|---|---|---|
| SR-300LX | 30 t × 3.0 m | 9.35–30.5 m | 6.6 m |
| SR-300R | 30 t × 3.0 m | 9.35–30.5 m | 6.6 m |
| SR-500L | 51 t × 2.5 m | 10.7–35.0 m | 7.0 m |
| SR-500LX | 51 t × 2.5 m | 10.8–42.0 m | 7.0 m |
| SR-700LⅡ | 70 t × 2.5 m | 10.0–44.5 m | 7.6 m |
| SR-800L | 80 t × 1.7 m | 10.0–44.5 m | 7.6 m |
These figures are current or recent official examples. Older Japanese-market units can have different dimensions, engines, ACS versions, jibs and lifting performance.
Maximum Tonnage Is Only the Starting Point
A crane's maximum lifting capacity applies only at a specified boom length and radius.
For example, the current SR-300LX is rated at 30 tonnes at a 3.0 m radius.
Its capacity changes as:
- Boom length increases
- Working radius increases
- Jib is installed
- Outrigger position changes
- Number of rope parts changes
- Operating direction changes
The same principle applies to every SR model.
Choose the crane from the actual lift requirement, not from the tonnage label.
Start With the Lift You Need to Perform
Before searching for a Kato SR crane, write down:
- Maximum load weight
- Required working radius
- Required hook height
- Available outrigger width
- Ground condition
- Frequency of lifting work
- Whether jib operation is required
This is more useful than asking only for a “30-ton crane” or “50-ton crane.”
SR-300LX: A 30-Tonne Class Example
The SR-300LX is a useful reference for buyers considering a medium-size rough terrain crane.
Kato lists:
- Maximum lifting capacity: 30 t × 3.0 m
- Boom length: 9.35–30.5 m
- Four-section boom
- Jib length: 7.9–13.0 m
- Jib offset angles: 5°, 25°, 45°
- Maximum outrigger width: 6.6 m
- Overall dimensions: 11,360 × 2,620 × 3,475 mm
- Gross vehicle weight: 26,990 kg
This size class can suit projects where a larger 50- or 70-ton crane would be unnecessary.
SR-300LX Has Multiple Outrigger Positions
Kato's official SR-300LX documentation lists five outrigger positions:
- Completely retracted
- 3.8 m intermediate
- 5.0 m intermediate
- 6.0 m intermediate
- 6.6 m fully extended
This can be useful on restricted jobsites.
However, lifting capacity changes according to outrigger setup. The correct rated-load chart must be used for the exact configuration.
SR-300R and SR-300LX Are Not the Same Crane
The SR-300R and SR-300LX both have a maximum lifting capacity of 30 t × 3.0 m and similar boom length.
However, their specifications are not identical.
For example, Kato lists different jib lengths and overall vehicle dimensions.
This illustrates a key used-buying rule:
Do not compare cranes by capacity class alone.
Confirm the full model designation before comparing price, reach or transport requirements.
SR-500L: A 51-Tonne Class With a 35-Metre Boom
Kato launched the SR-500L for the global market in 2016.
Official specifications include:
- Maximum lifting capacity: 51 t × 2.5 m
- Boom length: 10.7–35.0 m
- Four-section boom
- Jib length: 8.8 m or 15.2 m
- Maximum outrigger width: 7.0 m
- Gross vehicle weight: 33,970 kg
This model can suit heavier lifting where a 30-ton class crane does not provide enough capacity.
SR-500LX Adds Greater Boom Reach
The SR-500LX is also a 51-ton class rough terrain crane, but it uses a longer five-section boom.
Kato lists:
- Maximum lifting capacity: 51 t × 2.5 m
- Boom length: 10.8–42.0 m
- Five-section boom
- Jib length: 9.4–13.7 m
- Maximum boom lifting height: 43.2 m
- Maximum lifting height with jib: 57.1 m
- Gross vehicle weight: 37,075 kg
This means the SR-500L and SR-500LX should not be treated as interchangeable simply because both are rated at 51 tonnes.
Choose SR-500LX When Reach Matters More
The longer main boom can make the SR-500LX more attractive when:
- Greater lifting height is required.
- Longer working radius is common.
- Jib use is expected.
- The jobsite can accommodate the larger machine.
The SR-500L may still be the more practical machine if its load chart covers your work and its different dimensions better suit your transport or jobsite.
SR-700LⅡ and SR-800L Move Into Heavier Work
Kato's current SR-700LⅡ is rated at 70 t × 2.5 m.
Its official specification includes:
- Boom length: 10.0–44.5 m
- Six-section boom
- Jib length: 8.3–13.2 m
- Maximum outrigger width: 7.6 m
- Gross vehicle weight: 39,800 kg
The SR-800L uses the same listed boom-length range but raises maximum lifting capacity to 80 t × 1.7 m.
These larger cranes can suit industrial and infrastructure work where heavier loads or greater lifting margins are required.
Larger Capacity Also Means Larger Ownership Requirements
As crane size increases, buyers should expect greater costs for:
- Tires
- Wire ropes
- Winch components
- Hydraulics
- Transport
- Fuel
- Inspection and service
Do not move to a 70- or 80-ton machine simply because the purchase price appears attractive.
Check the Boom Before Anything Cosmetic
The telescopic boom is a critical structural component.
Inspect:
- Boom sections
- Dents
- Cracks
- Corrosion
- Previous welding
- Wear pads
- Boom head
- Extension cylinders
- Telescoping movement
Fresh paint should never be treated as evidence of good boom condition.
Operate the Boom Through Its Range
If testing is possible, extend and retract the boom while watching for:
- Jerky movement
- Uneven section extension
- Hydraulic leakage
- Abnormal noise
- Unexpected stopping
- Warning messages
Test procedures should follow the manufacturer's operating requirements.
Inspect the Jib and EJIB System
Kato has used EJIB systems on several SR models.
The EJIB design was developed to simplify deployment and reduce the amount of work required at height.
On a used crane, confirm:
- Jib is actually included
- Correct jib type for the model
- Structural condition
- Pins and locking components
- Sheaves
- Deployment mechanism
- Hydraulic or assist components where fitted
A missing or damaged jib can materially change the crane's usable reach.
Wire Rope Is a Safety-Critical Component
Inspect main and auxiliary wire ropes for:
- Broken wires
- Kinking
- Flattening
- Corrosion
- Birdcaging
- Abnormal wear
- Damage at termination points
Replacement decisions should follow the correct manufacturer and local safety requirements.
Inspect the Main and Auxiliary Winches
Most rough terrain crane buyers should check both winch systems where fitted.
Inspect:
- Winch drums
- Hydraulic motors
- Brakes
- Bearings
- Sheaves
- Rope spooling
- Unusual noise
During a controlled test, hoisting and lowering should be smooth and predictable.
Check the Hook Block
Review:
- Hook condition
- Latch
- Sheaves
- Side plates
- Identification markings
- Deformation or cracking
Also confirm that the hook block and number of rope parts match the intended lift.
ACS Is One of the Most Important Kato Systems to Verify
Kato uses its Automatic Crane System, or ACS, as a crane safety and monitoring system.
Depending on model and generation, ACS monitors operating conditions and responds to changes in crane configuration.
Newer systems can interact with:
- Boom condition
- Working radius
- Outrigger setup
- Rated capacity
- Operating limits
- Other crane configuration data
Older SR models may use earlier ACS generations.
Do Not Ignore ACS Warnings on a Used Crane
During inspection, confirm:
- ACS display powers up.
- No unexplained permanent warning remains.
- Boom-related values change plausibly.
- Outrigger position is recognized where applicable.
- Limit alarms operate.
- Sensors and switches appear responsive.
Kato's technical document service lists separate instruction and ACS manuals for different crane models and systems. This reinforces the need to identify the exact model and ACS generation.
Inspect All Outriggers
Outriggers provide the stable base required for rated lifting.
Inspect:
- Outrigger beams
- Hydraulic cylinders
- Cylinder rods
- Pads or floats
- Extension movement
- Position sensors
- Structural cracks
- Previous welding
Test every available extension position where practical.
Check the Slewing System
Inspect the rotating upper structure for:
- Abnormal play
- Unusual noise
- Hydraulic leakage
- Slewing brake behavior
- Bearing-area damage
A crane may appear mechanically good during straight lifting but still have slewing-related wear.
Inspect the Hydraulic System
Hydraulics control most crane functions.
Review:
- Boom elevation cylinder
- Boom extension
- Winches
- Outriggers
- Slewing hydraulics
- Pumps
- Valves
- Hoses
- Oil leakage
Slow or inconsistent operation deserves further investigation.
The Carrier Must Be Checked Separately From the Crane Section
A rough terrain crane is both a lifting machine and a mobile carrier.
Inspect:
- Engine
- Transmission
- Axles
- Steering
- Brakes
- Suspension
- Tires
- Lights
- Warning systems
Kato's official service network separates inspection of the crane upper structure and the carrier section, which reflects how both areas require attention.
Test Two-Wheel and Four-Wheel Steering Where Fitted
Rough terrain cranes often use multiple steering modes.
For example, the SR-500LX official specification lists a smaller turning radius under four-wheel steering than two-wheel steering.
Check:
- Steering response
- Mode selection
- Hydraulic leaks
- Wheel alignment
- Warning indicators
Inspect Tires Carefully
Large rough terrain crane tires can be expensive to replace.
Check:
- Tread depth
- Sidewall cuts
- Cracking
- Uneven wear
- Correct tire size
- Mismatched tires
- Wheel condition
A crane with excellent lifting equipment but four worn tires may still require major immediate expenditure.
Operating Hours and Mileage Need Context
A mobile crane can accumulate crane working hours and road mileage at very different rates.
Compare both readings with:
- Winch wear
- Boom condition
- Outrigger wear
- Hydraulic condition
- Engine condition
- Tire wear
- Carrier condition
- Maintenance records
A crane with low mileage may still have completed many hours of stationary lifting.
Generation Differences Matter on Kato SR Cranes
Kato's official technical archive lists many earlier SR models, including:
- SR-200R
- SR-250R
- SR-250Ri
- SR-250Rf
- SR-250RfⅡ
Kato also identifies chassis type codes such as KR-25H-F and other variants.
These differences can affect:
- Engine
- Boom
- Jib
- ACS
- Emissions equipment
- Dimensions
- Load charts
Confirm the model plate and serial number before researching parts or specifications.
SR-250Rf Shows Why Production Year Matters
Kato introduced the SR-250Rf PREMIUM in Japan in 2016.
The manufacturer states that it used a 25-ton maximum lifting capacity, four-section 30.5 m boom and an engine compliant with Japan's 2014 diesel special-motor-vehicle emissions regulation.
This specification should not be assumed for older SR-250R or SR-250Ri machines.
Check Local Support Before Importing
Before buying, consider availability of:
- Wire rope
- Hook blocks
- Sheaves
- Hydraulic seals
- ACS components
- Boom wear pads
- Outrigger parts
- Engine service parts
- Tires
Kato provides English technical documents for certain older models, but document availability differs by crane and generation.
Check Destination Crane Regulations
Crane regulations vary by country.
Before importing, confirm:
- Operator licensing
- Machine registration
- Periodic inspection requirements
- Road-use rules
- Load-test requirements
- Local certification requirements
Mechanical capability alone does not confirm that a crane can legally operate at the destination.
Shipping Size Must Be Checked Before Purchase
Rough terrain cranes are large and heavy.
For example:
| Model | Overall Size | Gross Vehicle Weight |
|---|---|---|
| SR-300LX | 11,360 × 2,620 × 3,475 mm | 26,990 kg |
| SR-500LX | 12,760 × 2,900 × 3,880 mm | 37,075 kg |
| SR-700LⅡ | 12,500 × 2,990 × 3,680 mm | 39,800 kg |
These differences can significantly affect inland transport and ocean shipping.
RORO, flat rack, breakbulk or another shipping arrangement may be considered depending on crane dimensions, destination, port, shipping line and current conditions.
No one shipping method applies to every Kato SR crane.
A Practical Kato SR Used Buyer Checklist
- Lift Requirement: Confirm load weight, radius and hook height.
- Model: Identify the complete SR model and chassis type.
- Load Chart: Confirm the crane can perform the real lift.
- Boom: Inspect sections, wear, cracks and extension operation.
- Jib: Confirm type, condition and completeness.
- Wire Rope: Check wear, deformation and corrosion.
- Winches: Check drums, brakes, motors and smooth operation.
- Hook Block: Check hook, latch and sheaves.
- ACS: Confirm safety-system operation.
- Outriggers: Test beams, cylinders and position recognition.
- Slewing: Check play, noise and braking.
- Hydraulics: Inspect hoses, cylinders, pumps and leaks.
- Carrier: Check engine, transmission, steering and brakes.
- Tires: Check tread, cuts and matching.
- Hours / Mileage: Compare readings with physical wear.
- Maintenance: Review records where available.
- Serial Number: Confirm identity before ordering parts.
- Local Support: Check parts and technical support.
- Regulations: Confirm destination requirements.
- Shipping: Confirm exact dimensions and weight.
Buying a Used Kato SR Rough Terrain Crane from Japan
Japanese used machinery can include Kato SR rough terrain cranes from several capacities, generations and specifications.
You can check current Japanese used machinery available at EVERYCAR.jp. Inventory changes regularly, so a specific Kato SR model should not be assumed to remain available.
When making an inquiry, useful information includes your preferred Kato SR model or required crane capacity, maximum load, working radius, lifting height, budget and destination.
For wider information about cranes, machine inspection, operating hours, shipping and other Japanese used machinery buying decisions, visit the Japanese Used Machinery & Heavy Equipment Guide.
Choose the SR Model From the Lift and Jobsite
A Kato SR crane should be selected from the work it must perform, not simply from the maximum tonnage printed on the model specification.
Start with load weight, radius, lifting height and available outrigger width. Then select the SR capacity and boom configuration that can meet those requirements.
After choosing the correct class, inspect the individual crane carefully. Boom condition, wire ropes, winches, ACS, outriggers, hydraulics, slewing system, tires, carrier condition and maintenance can all change the real value.
If you are looking for a used Kato SR rough terrain crane from Japan, you can contact EVERY with your preferred model or required capacity, load weight, working radius, lifting height, budget and destination. Exact specifications, load-chart performance, equipment and condition should be confirmed for each individual crane before purchase.
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