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JLG 600SJC - User Manual

JLG 600SJC
270 pages
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Service and Maintenance Manual
Model
600SC
660SJC
S/N 0300174703
to Present
P/N - 3121607
March 10, 2014

Table of Contents

Questions and Answers

  • L
    Loretta ReynoldsAug 2, 2025
    Why does the selected position cannot be maintained on my JLG Boom Lifts?
    • J
      Jason GallegosAug 2, 2025
      The inability to maintain a selected position in your JLG Boom Lifts could stem from several issues. It might be due to an internal leak in the control or counterbalance valve, which requires disconnecting hydraulic lines, bypassing the valve, and checking for fluid flow from valve ports. If there's a steady flow, the valve needs replacement. Another cause could be a leak in the piston or shaft seal, necessitating an internal leakage test after removing the plug and housing's valve ports and operating the actuator through housing ports. Finally, air trapped in the actuator might be the culprit, requiring you to purge the air by following the bleeding procedures.
  • S
    Steven SalazarAug 17, 2025
    What to do if shaft will not fully rotate on JLG 600SJC?
    • H
      hunter97Aug 18, 2025
      If the shaft on your JLG Boom Lifts won't fully rotate, check for gear binding due to twisted or chipped gear teeth; the actuator may need replacement if rebuilding isn't possible, and this damage could result from overload or shock. Also, ensure that port fittings aren't obstructing the piston by checking their thread length to confirm they don't reach inside the housing bore during the stroke.
  • M
    Mark JenningsAug 26, 2025
    Why is the operation erratic on my JLG 600SJC Boom Lifts?
    • E
      Eric HillAug 26, 2025
      Erratic or unresponsive operation in your JLG Boom Lifts is often due to air in the actuator. To resolve this, purge the air from the actuator following the bleeding procedures.
  • K
    Kayla StewartNov 9, 2025
    How to fix slow shaft rotation in JLG Boom Lifts?
    • M
      markschmidtNov 9, 2025
      A slow or non-existent shaft rotation in your JLG Boom Lifts can arise from several factors. First, verify the correct operating pressure, ensuring you don't exceed the OEM's specifications, as insufficient torque output could be the cause, or the load may be above the actuator's maximum capacity. Next, inspect ports for obstructions and hydraulic lines for restrictions and leaks if a low rate of fluid flow is suspected. If the control or counterbalance valve has an internal leak, disconnect hydraulic lines, bypass the valve, and check for fluid flow from the valve ports; replace the valve if a steady flow is observed. Furthermore, check for piston and/or shaft seal leaks by removing the plug and housing’s valve ports and conducting an internal leakage test. Corrosion build-up on the thrus...

Summary

INTRODUCTION AND SAFETY

MAINTENANCE SAFETY PRECAUTIONS

General safety precautions for aerial platform maintenance.

REVISION LOG

Records changes and history of the manual.

SPECIFICATIONS

OPERATING SPECIFICATIONS

Machine operating parameters and capabilities.

DIMENSIONAL DATA

Physical dimensions and measurements of the machine.

CAPACITIES

Fluid capacities for various systems.

ENGINE DATA

Technical specifications for the Deutz TD 2.9 engine.

FUNCTION SPEEDS

Speed specifications for machine functions.

TORQUE REQUIREMENTS

Recommended torque values for fasteners.

HYDRAULIC OIL

Hydraulic oil specifications and recommendations.

MAJOR COMPONENT WEIGHTS

Weights of major machine components for lifting.

OPERATOR MAINTENANCE

Routine maintenance tasks for the operator.

GENERAL PROCEDURES

MACHINE PREPARATION, INSPECTION, AND MAINTENANCE

Procedures for preparing, inspecting, and maintaining the machine.

SERVICE AND GUIDELINES

General guidelines for servicing the equipment.

LUBRICATION AND INFORMATION

Information and procedures for lubrication.

CYLINDER DRIFT TEST

Methods for measuring acceptable cylinder drift.

PINS AND COMPOSITE BEARING REPAIR GUIDELINES

Guidelines for repairing pins and composite bearings.

WELDING ON JLG EQUIPMENT

Safety instructions for welding JLG equipment.

CHASSIS AND TURNTABLE COMPONENTS

CHASSIS COMPONENTS AND SERVICING

Identification and servicing of chassis components.

Track and Chain Maintenance

Procedures for track and chain maintenance.

Track Roller Maintenance

Procedures for track roller disassembly and assembly.

Idler Roller Assembly

Description and assembly of the idler roller.

Drive Motor Servicing

Disassembly and assembly of the drive motor.

Swing Drive Maintenance

Exploded views and procedures for the swing drive.

Swing Bearing Service

Procedures for swing bearing inspection and replacement.

BOOM AND PLATFORM SYSTEMS

BOOM SYSTEMS REMOVAL

Procedures for removing platform and boom components.

WEAR PAD MAINTENANCE

Information on wear pad thickness and replacement.

BOOM DISASSEMBLY AND CABLE REPLACEMENT

Procedures for boom section disassembly and cable replacement.

WIRE ROPE INSPECTION AND MAINTENANCE

Criteria and procedures for wire rope inspection.

WIRE ROPE TENSIONING ADJUSTMENT

Procedure for adjusting wire rope tension.

ARTICULATING JIB BOOM SERVICE

Procedures for removal, disassembly, and inspection of the articulating jib boom.

LIMIT SWITCH AND CAM VALVE ADJUSTMENT

Adjustment procedures for limit switches and cam valves.

ROTARY ACTUATOR SERVICE

Theory of operation, required tools, and disassembly of the rotary actuator.

FOOT SWITCH ADJUSTMENT

Procedure for adjusting the foot switch.

PLATFORM SUPPORT AND SECTION REPLACEMENT

Torque settings and replacement of platform sections.

POWERTRACK MAINTENANCE

Procedures for maintaining powertracks, including link removal and installation.

HYDRAULIC SYSTEM COMPONENTS

O-RING LUBRICATION METHODS

Methods for lubricating O-rings before assembly.

CYLINDER THEORY OF OPERATION AND CHECKING

Explanation and checking procedures for cylinders.

CYLINDER REMOVAL AND INSTALLATION

Procedures for removing and installing boom cylinders.

HYDRAULIC PUMP (GEAR) SERVICE

Disassembly and inspection of the gear hydraulic pump.

VARIABLE PUMP OPERATION

Information on ports, pressure gauges, and controls.

HYDRAULIC COMPONENT START-UP

Start-up procedures for hydraulic components.

PRESSURE SETTING PROCEDURES

Procedures for setting pressure for various functions.

JLG CONTROL SYSTEM

INTRODUCTION TO JLG CONTROL SYSTEM

Overview of the JLG control system and its functions.

CONTROLLER BLOCK DIAGRAM

Diagram illustrating the controller block connections.

USING THE ANALYZER

Instructions on how to use the analyzer to navigate menus and view data.

MACHINE PERSONALITY SETTINGS

Overview of personality settings for machine performance.

Analyzing Machine Functions

Flowcharts detailing analyzer software menus.

HELP FAULT CODES AND DESCRIPTIONS

Table of help messages, fault codes, and their descriptions.

MACHINE CONFIGURATION PROGRAMMING

Table detailing machine configuration settings.

BASIC ELECTRICAL INFORMATION AND SCHEMATICS

MULTIMETER BASICS AND USAGE

Information on using multimeters for electrical troubleshooting.

DIELECTRIC GREASE APPLICATION

Instructions for applying dielectric grease to electrical connectors.

CONNECTOR ASSEMBLY AND DISASSEMBLY

Procedures for assembling and disassembling various connector types.

ELECTRICAL COMPONENT DIAGRAMS

Diagrams of electrical components and schematics.

HYDRAULIC SCHEMATICS

Schematics of hydraulic systems.

JLG 600SJC Specifications

General IconGeneral
BrandJLG
Model600SJC
CategoryBoom Lifts
LanguageEnglish

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