A crane LMI display may show incorrect data because of sensor signal errors, communication failures, damaged wiring, incorrect calibration parameters, controller problems, or an incompatible replacement display. When operators see incorrect load values, wrong boom length, inaccurate angle readings, or unstable warning messages, the problem is not always the display itself. The LMI display receives and processes information from multiple components, including pressure sensors, angle sensors, boom length sensors, cable reels, and controllers. A correct diagnosis requires checking the complete signal chain instead of replacing parts randomly. This guide explains why crane LMI displays show incorrect information, how to identify the faulty component, and what information buyers should provide when ordering replacement LMI display parts.

---

What Information Does a Crane LMI Display Show?

A crane Load Moment Indicator display is the operator’s interface for monitoring crane working conditions.

Depending on the crane model and system configuration, the display may show:

• Actual lifting load
• Rated lifting capacity
• Load percentage
• Boom angle
• Boom length
• Working radius
• Crane configuration
• Alarm status
• Safety limit information

The display itself does not independently measure all these parameters.

Instead, it receives signals from:

• Load pressure sensor
• Boom angle sensor
• Boom length sensor
• Cable reel system
• LMI controller
• CAN communication network

Therefore, incorrect information on the screen may come from any component in the signal chain.

XZJMD supplies Crane Monitor / LMI Display Components for different crane brands and applications, including replacement solutions for XCMG, SANY, Zoomlion and other crane systems.

---

Problem 1: The Crane LMI Display Shows Incorrect Load Weight

One of the most common complaints is:

The crane display shows the wrong lifting weight.

Typical symptoms:

• Load value is higher than actual weight
• Load value changes randomly
• Overload warning appears during normal lifting
• Display value does not match the load chart

Possible causes:

Pressure Sensor Signal Error

The LMI system calculates load based on hydraulic pressure.

If the pressure sensor provides incorrect data, the display may show:

• Incorrect load percentage
• False overload warning
• Unstable weight reading

Sensor Calibration Problem

After replacing:

• Pressure sensor
• Controller
• Display

the system may require recalibration.

A new component without correct parameters may display incorrect information.

XZJMD provides Crane Sensor Solutions including pressure sensors and monitoring components used in crane LMI systems.

---

Problem 2: Boom Length or Angle Data Is Incorrect

The LMI system depends heavily on boom position information.

If the display shows:

• Wrong boom length
• Incorrect boom angle
• Wrong working radius

the possible causes include:

• Angle sensor failure
• Cable reel damage
• Length sensor signal interruption
• Wiring problems
• Communication errors

Boom Angle Sensor Failure

The angle sensor provides information about:

• Boom elevation
• Working radius calculation
• Safety limit calculation

Common symptoms:

• Display angle differs from actual boom position
• Alarm appears during normal operation
• Capacity calculation becomes inaccurate

Boom Length Sensor / Cable Reel Failure

The cable reel measures boom extension length.

Failures may include:

• Cable breakage
• Internal spring damage
• Encoder failure
• Signal interruption

XZJMD provides Crane Cable Reel Box Components for boom length measurement applications.

Common applications include:

• XCMG crane cable reel
• SANY crane cable reel
• Zoomlion crane cable reel
• Hirschmann compatible cable reel systems

---

Problem 3: Crane LMI Display Has Communication Errors

Sometimes all sensors work normally, but the display cannot receive correct information.

Common symptoms:

• Blank data fields
• Frozen screen
• Random restart
• Communication error message
• Missing sensor information

Possible causes:

CAN Communication Failure

Modern crane electronic systems often use CAN communication between:

• Display
• Controller
• Sensors

Communication problems may result from:

• Damaged cables
• Loose connectors
• Water intrusion
• Poor electrical contact
• Controller failure

Wiring Harness Problems

A damaged harness can interrupt:

• Power supply
• Sensor signals
• Communication signals

Before replacing the display, technicians should check:

• Connector condition
• Voltage supply
• Ground connection
• Communication lines

---

Problem 4: Replacement Crane LMI Display Does Not Match the Crane

Replacing an LMI display is not always a simple plug-and-play process.

A compatible display must match:

• Crane manufacturer
• Crane model
• LMI system version
• Software parameters
• Communication protocol
• Connector configuration

For example:

A display from one XCMG crane model may not work correctly on another model if:

• Load chart parameters differ
• Software version differs
• Communication protocol is different

Before ordering a replacement, buyers should provide:

• Original display model
• Part number
• Crane model
• Photos of connectors
• Existing software information

XZJMD supports replacement solutions for various crane brands including XCMG, SANY and Zoomlion.

---

Problem 5: The Display Works but Shows Wrong Crane Parameters

Another common issue occurs after:

• Display replacement
• Controller replacement
• System upgrade
• Crane modification

The screen may turn on normally but show:

• Wrong lifting capacity
• Wrong crane model
• Incorrect load chart
• Incorrect working mode

Possible reasons:

• Incorrect parameter file
• Missing configuration data
• Incorrect calibration
• Software mismatch

The LMI display is only one part of the complete safety system.

The controller and display must share the correct:

• Crane configuration
• Load chart
• Sensor calibration values
• Operating parameters

---

Problem 6: Screen Damage and Hardware Failure

Not all display problems are software-related.

Physical failures include:

• Black screen
• Broken buttons
• Damaged LCD
• Water damage
• Power failure
• Touch function failure
• Internal electronic component damage

Common causes:

• Long-term outdoor exposure
• Vibration
• Temperature changes
• Moisture
• Electrical instability

For older cranes, replacing the display may be more economical than repairing obsolete electronic components.

XZJMD provides Crane Monitor Replacement Parts for repair and replacement applications.

---

How to Diagnose a Crane LMI Display Problem?

Follow this troubleshooting process:

Step 1: Record the Error

Collect:

• Alarm code
• Display message
• Crane operating condition
• Fault frequency

---

Step 2: Compare Display Data With Actual Conditions

Check:

• Actual boom angle
• Actual boom length
• Actual load
• Display reading

Identify which parameter is incorrect.

---

Step 3: Check Power Supply

Verify:

• Voltage
• Ground connection
• Connector condition

---

Step 4: Test Sensors

Check:

• Pressure sensor
• Angle sensor
• Length sensor

---

Step 5: Check Communication

Inspect:

• CAN connection
• Wiring harness
• Controller communication

---

Step 6: Confirm Calibration Data

After replacing components:

• Display
• Sensor
• Controller

perform required calibration and parameter setup.

---

Which Crane LMI Display Components Does XZJMD Supply?

Crane LMI Display / Monitor

Used for:

• Load monitoring
• Alarm display
• Crane parameter visualization

Product link:

https://www.xzjmd.com/products/monitor/

---

Crane Sensor Components

Including:

• Angle sensor
• Pressure sensor
• Length sensor

Product link:

https://www.xzjmd.com/products/sensor/

---

Crane Cable Reel Box

Used for:

• Boom length measurement
• Signal transmission

Product link:

https://www.xzjmd.com/products/cable-reel-box/

---

Crane Controller and Mainboard

Used for:

• Data processing
• LMI calculation
• Electronic replacement

Product link:

https://www.xzjmd.com/products/motherboard/

---

What Information Should Buyers Provide When Ordering a Crane LMI Display?

To avoid incorrect matching, buyers should provide:

Providing complete information helps suppliers identify the correct replacement solution faster.

---

Can an Old Crane Use a New LMI Display?

Yes, but compatibility must be confirmed.

For older cranes, the solution may require:

• New display
• Controller replacement
• Sensor matching
• Parameter configuration
• Calibration

A complete upgrade may be more practical when:

• Original parts are discontinued
• Repair cost is high
• Display technology is outdated
• Spare parts are difficult to find

XZJMD provides crane electronic replacement and upgrade solutions for different crane brands.

---

Frequently Asked Questions

Why is my crane LMI display showing incorrect load?

Possible causes include:

• Pressure sensor problems
• Calibration errors
• Controller communication issues

---

Why does my crane display show the wrong boom length?

Possible causes:

• Cable reel failure
• Length sensor damage
• Wiring problems

---

Does replacing an LMI display require calibration?

In many cases, yes. The replacement display must match the crane parameters and system configuration.

---

Can a bad sensor affect the LMI display?

Yes. Incorrect sensor signals directly affect displayed crane data.

---

How do I find the correct crane LMI display replacement?

Provide:

• Crane brand
• Crane model
• Original part number
• Product photos
• Fault information

---

Need a Compatible Crane LMI Display Replacement?

Incorrect LMI display data can affect crane operation efficiency and safety.

Before replacing components, check:

• Display condition
• Sensor signals
• Cable reel feedback
• Controller communication
• Calibration parameters

XZJMD supplies:

• Crane LMI Displays
• Sensors
• Cable Reel Boxes
• Controllers
• Electronic Replacement Parts

Provide your crane model, original part number and fault description.

Contact XZJMD for compatible Crane LMI Display replacement solutions and technical support.