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Mec 3072RT User Manual

Mec 3072RT
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SERVICE AND PARTS MANUAL
Part # 91220 R1
March 2008
3072RT / 3772RT
3772RT HD
Serial Number Range
3072RT: 9201000 - Present
3772RT / 3772RT HD: 9301000 - Present
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Table of Contents

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Mec 3072RT Specifications

General IconGeneral
Weight2041 kg
Drive TypeElectric
Gradeability25%
Max Gradeability25 %
Power SourceBattery
Maximum Platform Height7.62 m
Platform Capacity227 kg
Overall Length3.05 m
Max Working Height9.14 m
Platform Length2.13 m
Platform Width0.76 m
Capacity227 kg
Turning Radius (Outside)3.05 m

Summary

Introduction to MEC Service and Parts Manual

General Safety Tips

Guidance on safe inspection, maintenance, and critical safety warnings for scissor lifts.

Hydraulic System Safety Precautions

Warnings and precautions related to hydraulic fluid, pressure, and systems.

Electrical System Safety Precautions

Precautions for handling batteries and electrical systems to prevent damage or injury.

Total System Safety Considerations

General safety advice regarding engine coolant and overall system maintenance.

Machine Specifications Overview

Primary Machine Components Index

Lubrication Schedule and Specifications

Section 1: Hydraulic System

Hydraulic System - General

Overview of the open center, open-loop hydraulic system and its components.

Hydraulic Fluid Handling Precautions

Precautions for handling hydraulic fluid, including warnings about pressure and contact.

Hydraulic Fluid Reservoir Description

Description of the hydraulic fluid reservoir, filter, and maintenance checks.

Hydraulic Pump and Wheel Drive Systems

Details on the variable displacement hydraulic pump and the hydraulic wheel motors.

Parking Brake and Towing Circuit

Procedure for releasing parking brakes for towing and resetting them.

Emergency Systems and Procedures

Instructions for safely lowering the platform using the emergency down system.

Steering Circuit Description

Description of the hydraulic steering system components and operation.

Platform Lift Circuit

Explanation of the lift system, lift cylinders, and platform capacity limitations.

Optional Outriggers System

Information on the optional outrigger system, manifold, and cylinders.

Hydraulic Cylinder Repair

Guidelines and warnings for repairing hydraulic cylinders, including disassembly and assembly.

Hydraulic Manifold Procedures

Procedure for removing, disassembling, cleaning, and assembling the hydraulic manifold.

Section 2: Electrical System

Electrical System Overview

Description of the electrical control system, base, and platform control stations.

Deutsch Connectors

Instructions for replacing and crimping Deutsch connectors and their parts.

Battery System

Information on the 12-volt battery system, maintenance, and replacement procedures.

Battery Preventative Maintenance

Procedures for maintaining the battery both in use and in storage.

Battery Replacement Procedure

Step-by-step instructions for safely removing and installing the machine's battery.

Alarms and Switches

Description of emergency stop buttons, selector switch, and diagnostic LEDs.

Tilt Alarm System

Information on the tilt sensor, its audible warning, and testing procedures.

Relays and Switches

Details on the purpose and location of various relays and switches in the system.

Limit Switch and Outrigger Switches

Explanation of limit switches and outrigger switches for machine operation.

Continuity Checks

Procedures for checking the continuity of various switches and relays using an ohm meter.

Section 3: Mechanical Components

Torque Specifications

Values for applying torque to fasteners and hydraulic components for proper assembly.

Base and Undercarriage

Description of the base/undercarriage, including cautions for cleaning and raising the machine.

Raising and Supporting the Machine

Safe procedures and equipment required for lifting and supporting the scissor lift.

Tire Inspection and Replacement

Inspection guidelines for tires and procedures for changing tires safely.

Drive Motors Description and Service

Description and removal/replacement procedures for front and rear drive motors.

Steer Cylinder Service

Information on the double-acting steer cylinders, replacement, and seal replacement.

Hoses, Cables, and Platform Removal

Inspection guidelines for hoses and electrical cables, and procedures for platform removal.

Lift Cylinder and Scissor Beam Service

Procedures for removing/installing lift cylinders and inspecting scissor beam assemblies.

Engine Maintenance Procedures

Procedures for maintaining diesel and gasoline/dual-fuel engines, including oil and filter changes.

Outrigger Function and Calibration

Description of outrigger operation, leveling, and calibration procedures.

Section 4: Troubleshooting

General Troubleshooting Tips

Basic checks for malfunctions, including battery, switches, and fluid levels.

Hydraulic System Malfunctions

Common causes of hydraulic system problems like fluid contamination and incorrect viscosity.

Hydraulic Pressure Adjustment Procedures

Procedure for checking and adjusting hydraulic pressure relief valves for optimal performance.

Proportional Speed Adjustment

Tests and procedures for adjusting drive speeds using the proportional circuit board settings.

Controls and Switches Troubleshooting

Diagrams and information on controls and switches for troubleshooting electrical issues.

Section 5: Schematics

Hydraulic Schematic

Diagrams and callout tables for the overall hydraulic system.

Main Hydraulic Manifold Schematic

Detailed schematic of the main hydraulic manifold with port identification.

Optional Outriggers Hydraulic Manifold Schematic

Schematic of the hydraulic manifold for the optional outrigger system.

Electric Schematics Overview

Introduction to electrical schematics, including harnesses, circuit boards, and controls.

Circuit Board Schematics

Detailed schematics of the main circuit board and its connections.

Control Station Schematics

Schematics for upper and lower control stations, joysticks, and switches.

Engine Schematics

Schematics for the diesel and dual-fuel engine electrical systems.

Optional Outriggers Schematics

Wiring schematic for the optional outrigger system.

Optional Generator Schematics

Wiring schematic for the optional generator system.

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