JLG 600S Service Manual (English)

Other manuals for JLG 600S

Questions and Answers:

M
mcdonaldwalterJul 27, 2025
How to troubleshoot a JLG Lifting Systems that won’t shift or is slow to start?
- F
  farrellmatthewJul 27, 2025
  If your JLG Lifting System won’t shift or is slow to start, it could be due to obstructed or restricted flow through the servo control signal lines, which could result in slow shift or no shift motor conditions. Ensure the signal lines are not obstructed or restricted and that the signal pressure is adequate to shift the motor. Also, supply and drain orifices determine motor shift, and obstruction increases shift times. Ensure proper control orifices are installed in the motor and are not obstructed; clean or replace them if necessary.
R
Russell BeckAug 2, 2025
Why is my JLG 600S system operating hot?
- J
  jason03Aug 3, 2025
  Your JLG Boom Lifts system might be running hot due to several reasons. It could be due to an insufficient amount of hydraulic fluid, which fails to meet the system's cooling demands. In this case, fill the reservoir to the proper level. Another cause might be a failing or obstructed heat exchanger, which also prevents adequate cooling. Make sure the heat exchanger is receiving enough air flow and is in good condition; repair or replace it if needed. Finally, a system relief valve that's unseated for too long or malfunctioning could cause overheating. Repair or replace any faulty relief valves and check that the machine's loads aren't too high.
Z
zkellyAug 8, 2025
Why is there excessive noise and vibration in my JLG Lifting Systems?
- H
  hojohnAug 8, 2025
  Excessive noise and vibration in JLG Lifting Systems can stem from several issues. Insufficient hydraulic fluid may cause cavitation. To resolve this, fill the reservoir to the correct level and ensure the oil supply to the motor is adequate and unobstructed. Trapped air in system lines or the motor can also lead to cavitation; ensure all system lines and components are purged of air. A loose or incorrect shaft coupling will produce vibrations; ensure the correct coupling is used and properly fitted on the shaft. Misaligned shafts create frictional vibration; ensure shafts are properly aligned. Finally, if the viscosity is above acceptable limits, it will result in cavitation; replace the hydraulic oil with the appropriate fluid for the operating conditions.
K
Kathleen BruceAug 14, 2025
What to do if my JLG Lifting Systems are operating hot?
- N
  nsimmonsAug 15, 2025
  A JLG Lifting System may overheat due to several reasons. An insufficient amount of hydraulic fluid will not meet system cooling demands, so ensure you fill the reservoir to the proper level. Also, if the heat exchanger is failing or obstructed, it may not meet system cooling demands. Make sure the heat exchanger is receiving adequate airflow and is in good operating condition; repair or replace it as necessary. Finally, if a system relief valve becomes unseated for an extended period or fails, the system could overheat. Repair or replace any malfunctioning relief valves and verify loads on the machine are not excessive.
D
Duane RogersAug 20, 2025
How to fix excessive noise and vibration in JLG Boom Lifts?
- J
  Jeff MartinezAug 20, 2025
  Excessive noise and vibration in your JLG Boom Lifts can stem from several issues. Insufficient hydraulic fluid can cause cavitation, leading to system noise; ensure the reservoir is filled to the correct level and that oil supply to the motor is adequate and unobstructed. Trapped air in system lines or the motor can also cause cavitation; make sure all system lines and components are purged of air. A loose or incorrect shaft coupling can produce vibrations; verify the correct coupling is used and fits properly. Misaligned shafts create frictional vibration; ensure shafts are properly aligned. Finally, hydraulic oil viscosity above acceptable limits can cause cavitation; replace the hydraulic oil with the appropriate fluid for your operating conditions.

JLG 600S Specifications

General

Platform Height	60 ft / 18.29 m
Platform Capacity	500 lbs
Weight	22, 800 lb / 10, 342 kg
Platform Capacity - Unrestricted	500 lbs
Gradeability - 4 Wheel Drive	45%
Maximum Platform Height	60 ft
Machine Height	9.83 ft / 3 m
Engine	Diesel
Working Height	66 ft
Swing	360 Degrees Continuous
Platform Size	36 x 96 in
Stowed Height	9.83 ft / 3 m
Ground Clearance	1 ft
Drive Speed - 4 Wheel Drive	4.5 mph / 7.24 km/h
Engine Power	74 hp
Drive Speed	4.5 mph / 7.24 km/h

Summary

SECTION A. INTRODUCTION - MAINTENANCE SAFETY PRECAUTIONS

A GENERAL

Contains general safety precautions for aerial platform maintenance.

B HYDRAULIC SYSTEM SAFETY

Details safety precautions for high-pressure hydraulic systems.

C MAINTENANCE

Lists essential safety precautions to follow during maintenance.

SECTION 1 - SPECIFICATIONS

1.1 CAPACITIES

Lists fluid capacities for various machine components.

1.2 COMPONENT DATA

Provides detailed specifications for engine, drive system, tires, etc.

1.3 PERFORMANCE DATA

Outlines travel speeds, gradeability, and machine weights.

1.4 FUNCTION SPEEDS

Details time required for various boom and drive functions.

1.5 TORQUE REQUIREMENTS

Lists torque values for critical fasteners and components.

1.6 LUBRICATION

Specifies recommended lubricants and intervals for machine components.

1.7 PRESSURE SETTINGS

Lists hydraulic system pressure settings for various functions.

1.8 CYLINDER SPECIFICATIONS

Provides bore, stroke, and rod diameter for cylinders.

1.9 MAJOR COMPONENT WEIGHTS

Lists approximate weights of major machine components.

1.10 CRITICAL STABILITY WEIGHTS

Details critical weights for machine stability.

1.11 LUBRICATION AND OPERATOR MAINTENANCE

Details lubrication points and maintenance schedules.

1.12 SERIAL NUMBER LOCATIONS

Identifies locations of serial number plates on the machine.

SECTION 3 - CHASSIS & TURNTABLE

3.1 TIRES & WHEELS

Covers tire inflation, damage, replacement, and wheel installation.

3.2 DRIVE TORQUE HUB

Details roll, leak, and brake testing procedures for torque hubs.

3.3 FREE WHEELING OPTION

Explains how to engage/disengage drive motors and brakes for towing.

3.4 DRIVE MOTOR (S/N 75606 TO PRESENT)

Describes the drive motor's operation and components.

3.5 OSCILLATING AXLE BLEEDING PROCEDURE AND LOCKOUT TEST

Provides steps for bleeding lockout cylinders and performing tests.

3.6 STEER ADJUSTMENTS

Details procedures for adjusting steering stops on the machine.

SECTION 3 - CHASSIS & TURNTABLE

3.7 SWING HUB

Covers adjustment procedures, disassembly, and assembly of the swing hub.

3.8 SWING BEARING

Details checks, wear tolerance, and replacement of the swing bearing.

3.9 SWING BRAKE - MICO

Outlines disassembly, inspection, and assembly of the swing brake.

3.10 ROTARY COUPLING

Procedure for installing the rotary coupling seal kit.

3.11 GENERATOR

Maintenance schedule for generator brushes and slip rings.

3.12 SPARK ARRESTER CLEANING INSTRUCTIONS

Instructions for cleaning the spark arrester component.

3.13 GLOW PLUGS

Explains the operation of glow plugs and indicator lamp.

3.14 FORD EFI ENGINE

Provides guidance on performing diagnostic checks for the Ford EFI engine.

SECTION 3 - CHASSIS & TURNTABLE

3.15 FORD LPG SYSTEM

Details the LPG system components and operation.

3.16 DEUTZ EMR 2 (S/N 84827 TO PRESENT)

Explains the EMR2 system and its components.

3.17 BIO FUEL IN DEUTZ ENGINES

Provides guidelines for using bio-fuels in DEUTZ engines.

3.18 GM ENGINE GENERAL MAINTENANCE

Covers maintenance of the drive belt and electrical system.

SECTION 3 - CHASSIS & TURNTABLE

3.19 GM ENGINE DUAL FUEL SYSTEM

Explains the operation and diagnosis of the GM dual fuel system.

SECTION 4 - BOOM & PLATFORM

4.1 BOOM ROPE TORQUING PROCEDURES

Details the procedure for torquing boom rope adjustment nuts.

4.2 WEAR PADS

Covers wear pad inspection, replacement, and adjustment.

4.3 WIRE ROPE

Provides guidelines for inspecting wire ropes for damage and wear.

4.4 BOOM MAINTENANCE

Outlines the removal and disassembly of boom sections and components.

4.5 ARTICULATING JIB BOOM

Details the removal, disassembly, inspection, and assembly of the articulating jib.

SECTION 4 - BOOM & PLATFORM

4.6 LIMIT SWITCHES AND CAM VALVE ADJUSTMENT

Describes how to adjust limit switches and cam valves.

4.7 BOOM CLEANLINESS GUIDELINES

Provides guidelines for maintaining internal boom cleanliness.

4.8 PLATFORM

Details the procedure for replacing platform sections.

4.9 ROTATOR - HELAC (PRIOR TO S/N 0300130779)

Outlines the disassembly procedure for the Helac rotator.

4.10 ROTARY ACTUATOR (S/N 0300130779 TO PRESENT)

Explains theory of operation, required tools, and disassembly of the rotary actuator.

4.11 FOOT SWITCH ADJUSTMENT

Details the procedure for adjusting the foot switch.

SECTION 5 - HYDRAULICS

5.1 CYLINDERS - THEORY OF OPERATION

Explains the function of double-acting and holding valve cylinders.

5.2 CYLINDER CHECKING PROCEDURE

Outlines procedures to check cylinders for leaks and proper operation.

5.3 CYLINDER REMOVAL AND INSTALLATION

Details the removal and installation of boom cylinders.

SECTION 5 - HYDRAULICS

5.4 CYLINDER REPAIR

Provides general procedures for cylinder disassembly and cleaning.

5.5 VARIABLE DISPLACEMENT PUMP (M46 SERIES)

Covers troubleshooting and gauge installation for the variable displacement pump.

5.6 VALVES - THEORY OF OPERATION

Explains the function of solenoid control valves and relief valves.

SECTION 5 - HYDRAULICS

5.7 PRESSURE SETTING PROCEDURES

Details how to adjust main relief, steer, swing, lift, and platform pressures.

5.8 HYDRAULIC COMPONENT START-UP PROCEDURES AND RECOMMENDATIONS

Provides guidelines for starting up hydraulic components.

5.9 HYDRAULIC PUMP W/HAYES PUMP DRIVE COUPLING LUBRICATION

Instructions for lubricating the hydraulic pump drive coupling.

SECTION 6 - JLG CONTROL SYSTEM

6.1 INTRODUCTION

Provides an overview of the JLG control system and its benefits.

6.2 TO CONNECT THE JLG CONTROL SYSTEM ANALYZER

Steps for connecting the analyzer to the control system.

6.3 USING THE ANALYZER

Instructions on navigating and using the analyzer display.

6.4 CHANGING THE ACCESS LEVEL OF THE HAND HELD ANALYZER

Procedure for accessing different levels and entering passwords.

6.5 ADJUSTING PARAMETERS USING THE HAND HELD ANALYZER

Explains how to adjust personality settings and parameters.

6.6 MACHINE SETUP

Details how to adjust machine digit items and select options.

6.7 LEVEL VEHICLE DESCRIPTION

Instructions for calibrating the level sensor.

6.8 MACHINE PERSONALITY SETTINGS

Provides ranges and defaults for machine personality settings.

6.9 ANALYZER DIAGNOSTICS MENU STRUCTURE

Outlines the structure and navigation of the analyzer's diagnostic menus.

SECTION 7 - BASIC ELECTRICAL INFORMATION & SCHEMATICS

7.1 GENERAL

Basic electrical information for locating and correcting problems.

7.2 MULTIMETER BASICS

Explains common multimeter measurements and usage.

7.3 APPLYING SILICONE DIELECTRIC COMPOUND TO ELECTRICAL CONNECTIONS

Procedure for applying dielectric compound to electrical connections.

7.4 AMP CONNECTOR

Details applying silicone dielectric compound to AMP connectors.

7.5 DEUTSCH CONNECTORS

Procedures for assembling and disassembling Deutsch connectors.

HD30/HDP20 Series Assembly

Procedure for assembling HD30/HDP20 series connectors.

HD30/HDP20 Series Disassembly

Procedure for disassembling HD30/HDP20 series connectors.

Related product manuals

JLG 600S Service Manual

Table of Contents

Other manuals for JLG 600S

Questions and Answers:

JLG 600S Specifications

Summary

SECTION A. INTRODUCTION - MAINTENANCE SAFETY PRECAUTIONS

A GENERAL

B HYDRAULIC SYSTEM SAFETY

C MAINTENANCE

SECTION 1 - SPECIFICATIONS

1.1 CAPACITIES

1.2 COMPONENT DATA

1.3 PERFORMANCE DATA

1.4 FUNCTION SPEEDS

1.5 TORQUE REQUIREMENTS

1.6 LUBRICATION

1.7 PRESSURE SETTINGS

1.8 CYLINDER SPECIFICATIONS

1.9 MAJOR COMPONENT WEIGHTS

1.10 CRITICAL STABILITY WEIGHTS

1.11 LUBRICATION AND OPERATOR MAINTENANCE

1.12 SERIAL NUMBER LOCATIONS

SECTION 3 - CHASSIS & TURNTABLE

3.1 TIRES & WHEELS

3.2 DRIVE TORQUE HUB

3.3 FREE WHEELING OPTION

3.4 DRIVE MOTOR (S/N 75606 TO PRESENT)

3.5 OSCILLATING AXLE BLEEDING PROCEDURE AND LOCKOUT TEST

3.6 STEER ADJUSTMENTS

SECTION 3 - CHASSIS & TURNTABLE

3.7 SWING HUB

3.8 SWING BEARING

3.9 SWING BRAKE - MICO

3.10 ROTARY COUPLING

3.11 GENERATOR

3.12 SPARK ARRESTER CLEANING INSTRUCTIONS

3.13 GLOW PLUGS

3.14 FORD EFI ENGINE

SECTION 3 - CHASSIS & TURNTABLE

3.15 FORD LPG SYSTEM

3.16 DEUTZ EMR 2 (S/N 84827 TO PRESENT)

3.17 BIO FUEL IN DEUTZ ENGINES

3.18 GM ENGINE GENERAL MAINTENANCE

SECTION 3 - CHASSIS & TURNTABLE

3.19 GM ENGINE DUAL FUEL SYSTEM

SECTION 4 - BOOM & PLATFORM

4.1 BOOM ROPE TORQUING PROCEDURES

4.2 WEAR PADS

4.3 WIRE ROPE

4.4 BOOM MAINTENANCE

4.5 ARTICULATING JIB BOOM

SECTION 4 - BOOM & PLATFORM

4.6 LIMIT SWITCHES AND CAM VALVE ADJUSTMENT

4.7 BOOM CLEANLINESS GUIDELINES

4.8 PLATFORM

4.9 ROTATOR - HELAC (PRIOR TO S/N 0300130779)

4.10 ROTARY ACTUATOR (S/N 0300130779 TO PRESENT)

4.11 FOOT SWITCH ADJUSTMENT

SECTION 5 - HYDRAULICS

5.1 CYLINDERS - THEORY OF OPERATION

5.2 CYLINDER CHECKING PROCEDURE

5.3 CYLINDER REMOVAL AND INSTALLATION

SECTION 5 - HYDRAULICS

5.4 CYLINDER REPAIR

5.5 VARIABLE DISPLACEMENT PUMP (M46 SERIES)

5.6 VALVES - THEORY OF OPERATION

SECTION 5 - HYDRAULICS

5.7 PRESSURE SETTING PROCEDURES

5.8 HYDRAULIC COMPONENT START-UP PROCEDURES AND RECOMMENDATIONS

5.9 HYDRAULIC PUMP W/HAYES PUMP DRIVE COUPLING LUBRICATION

SECTION 6 - JLG CONTROL SYSTEM

6.1 INTRODUCTION

6.2 TO CONNECT THE JLG CONTROL SYSTEM ANALYZER

6.3 USING THE ANALYZER

6.4 CHANGING THE ACCESS LEVEL OF THE HAND HELD ANALYZER

6.5 ADJUSTING PARAMETERS USING THE HAND HELD ANALYZER

6.6 MACHINE SETUP

6.7 LEVEL VEHICLE DESCRIPTION

6.8 MACHINE PERSONALITY SETTINGS