PAT MC320 Load Moment Indicator Service Manual

The MC320 is a load moment indicator for hydraulic boom cranes. It monitors crane loading using length and angle sensors, a cable reel, and a console that shows the operator what's happening and locks out the lever when limits are reached. Technicians open the service manual when a unit needs adjusting, a console shows nothing, or a reading is off. It's the book to have on the bench before you touch the console or cable reel.

What this manual helps you do

• Adjust the length and angle sensors and run the basic adjustment and voltage checks.
• Check console voltages and trace the console and junction box electrical diagram.
• Replace the EPROM in the console and service the LWG208 cable reel.
• Follow the general flowchart to diagnose no display, lever lockout, anti two block, length reading and load reading problems.
• Troubleshoot a broken length cable and wire up extension jumper cable assembly 031-300-103-541 using the extension diagrams.

Who this is for

A crane service technician or rental fleet mechanic who has an MC320 on a hydraulic boom crane and needs to fix it in-house. Also useful to independent repair shops and dealer technicians who see these systems come in with no paperwork.

FAQ

Q: What do I receive and how is it organised?

A: You get one PDF file, 37 pages, in English, with searchable text. It runs from definitions and adjustments through the electrical diagrams to the troubleshooting flowcharts.

Q: Which machine does it fit?

A: It is written for the PAT MC320 LMI for Hydraulic Boom Cranes, publication number 031-300-190-121. Check that number against the title wording on your unit's documentation.

Q: How does it fit the job I'm doing?

A: If you're chasing a fault, start at the general flowchart and work to the matching problem section. If you're adjusting or replacing parts, go to the sensor, cable reel and EPROM sections. The wiring diagrams cover the console, cable reel and each swingaway extension type.

This is the complete manual. Download it, open the flowchart, and you can start tracing the fault at the crane.

Click here to view the preview (PDF)

Table of Contents:

• Basic Adjustment And Voltage Checks
• Definitions
• Console and Junction Box Electrical Diagram
• Cable Reel Electrical Diagram
• EPROM Replacement in Console
• Console Voltage Checks
• Cable Reel LWG208
• Length and Angle Sensor Adjustment
• Jumper Cable Assembly for Extension 031-300-103-541
• A-Frame or Swingaway Extension Electrical Diagram
• Offset Swingaway Extension Electrical Diagram
• Tele Swingaway Extension Electrical Diagram
• General Flowchart
• Lever Lockout Activated
• Broken Length Cable
• No Display
• Anti Two Block Problem
• Length Reading Problem
• Load Reading Problem

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