JLG 340AJ Boom Lift Service Manual
404 pages · Publication 3121259
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- Models
- 340AJ
- Serial coverage
- Prior to 0300272222, Exclude Serial Number Range: 0300272191-0300292192
- Manual type
- Service Manual
- Pages
- 404
- Publication
- 3121259
- Condition
- Brand new
What's inside
From the manual's own table of contents: 408 sections, 474 entries. See sample pages (PDF, 605 KB)
General
Hydraulic System Safety
Maintenance6 topics
- Operating Specifications
- Dimensional Data
- Capacities
- Tires
- Engine Data
- Hydraulic Oil
Major Component Weights1 topic
- Function Speeds
Test Notes2 topics
- Operator Maintenance
- Machine Preparation, Inspection, and Maintenance
Preparation, Inspection, and Maintenance
Pre-Start Inspection
Pre-Delivery Inspection and Frequent Inspection
Annual Machine Inspection
Preventive Maintenance1 topic
- Service and Guidelines
Safety and Workmanship
Cleanliness
Components Removal and Installation
Component Disassembly and Reassembly
Pressure-Fit Parts
Bearings
Gaskets
Bolt Usage and Torque Application
Hydraulic Lines and Electrical Wiring
Hydraulic System
Lubrication
Battery
Lubrication and Servicing1 topic
- Lubrication and Information
Hydraulic Oil
Show all 408 sections
Changing Hydraulic Oil
Lubrication Specifications1 topic
- Cylinder Drift
Theory
Cylinder Leakage Test
Cylinder Thermal Drift2 topics
- Pins and Composite Bearing Repair Guidelines
- Welding on JLG Equipment
Do the Following When Welding on JLG Equipment
Do NOT Do the Following When Welding on JLG Equipment1 topic
- Tires and Wheels
Tire Replacement
Wheel and Tire Replacement
Wheel Installation5 topics
- Drive Orientation System
- Beyond Transport Position - Drive Speed Cutback System
- Drive/Steer - Boom Function Interlock System (CE ONLY)
- Drive System
- Drive Motor
Disassembly
Assembly1 topic
- Drive Hub
Roll, Leak and Brake Testing
Tightening and Torquing Bolts
Measuring Rolling Torque
Main Disassembly
Housing-Spindle Disassembly
Spindle-Brake Subassembly Disassembly
Cover Disassembly
Planet Gear Subassembly
Spindle-Brake Subassembly
Housing-Spindle Subassembly
Housing-Ring Gear Subassembly
Cover Subassembly
Main Assembly
Integral Brake Check Procedure1 topic
- Oscillating Axle System
Oscillating Axle Bleeding Procedure2 topics
- Chassis Tilt Indicator System
- Swing Motor
Removal
Preparation Before Disassembly
Disassembly and Inspection
One Piece Stator Construction
Two Piece Stator Construction
Final Checks
Installation1 topic
- Swing Drive
Turntable Bearing Mounting Bolt Condition Check
Wear Tolerance
Swing Bearing Torque Value3 topics
- Engine Operating States
- Engine Start Conditions
- Engine RPM Levels
Engine Stop RPM
Idle RPM
Mid Engine RPM
Multi-Function RPM
High Engine RPM
Generator RPM1 topic
- Engine Controls
Ambient Air Temperature Sensor
Fuel Level Sensor2 topics
- Engine Startup Procedure (Kubota)
- Kubota Engine
Engine Oil Pressure Switch
Engine Speed Sensor
Coolant Sensor
Glow Plugs
Engine Speed Actuators
Engine Start
Alternator Excitation
Fuel Pump
Shutdown1 topic
- GM Dual Fuel Engine
Communications with the JLG Control System
Oil Pressure
Engine Speed
Coolant Temperature
Fuel Select7 topics
- Fuel Reserve / Cut-Out System
- Cold Start System (Diesel Engine)
- Generator
- Counterweight
- Platform Control Enable System
- Transport Position Sensing System
- Platform
Platform/Support Removal
Support Installation2 topics
- Main Boom Powertrack
- Powertrack Maintenance
Remove Link
Install New Link
Replace Fixed End Brackets
Replace Moving End Brackets1 topic
- Boom Maintenance
Disassembly of the Main Boom
Inspection
Assembly of the Main Boom2 topics
- Boom Cleanliness Guidelines
- Rotary Actuator
Theory of Operation
Tools Required
Greasing Thrust Washers
Installing Counterbalance Valve
Testing the Actuator
Installation and Bleeding
Troubleshooting1 topic
- Skyguard®
Operation
Function Test
Diagnostics & Troubleshooting1 topic
- Lubricating O-Rings in the Hydraulic System
Cup and Brush
Dip Method
Spray Method
Brush-on Method1 topic
- Hydraulic Cylinders
Disassembly and Assembly Instructions
General Information
Standard of Maintenance
Inspection After Assembly
Disassembly Procedure1 topic
- Drive Pump
Description
The System Circuit
High Pressure Relief Valve (HPRV) and Charge Check
Charge Pressure Relief Valve
Electrical Displacement Control (EDC)
Port Locations and Gauge Installation
Fastener Size and Torque Chart
Plug Size and Torque Chart
Initial Startup Procedures
Pump Adjustment
Displacement Limiter Adjustment
Control Neutral Adjustment
Mechanical Neutral Adjustment
Removing the Pump
Electric Control Module
Control Solenoids
Shaft Seal, Roller Bearing and Shaft Replacement
Charge Check / HPRV
Pressure Limiter Valve Replacement3 topics
- Gear Pump
- Pressure Setting Procedure
- Oil Sampling
Procedure1 topic
- JLG Control System Analyzer Kit Instructions
Introduction2 topics
- Analyzer Menu Structure
- Using the Hand Held Analyzer
To Connect the JLG Control System Analyzer
Using the Analyzer
Changing the Access Level of the Hand Held Analyzer
Adjusting Parameters Using the Hand Held Analyzer
Machine Setup
Level Vehicle Description1 topic
- Operator Controls and Switches
Ground Control Switches
Platform Control Switches2 topics
- Control System Startup Checks
- LSS System
Diagnostic Menu
Calibration Procedure
Testing & Evaluation4 topics
- Resetting The MSSO System
- System Fault Messages
- General
- Multimeter Basics
Grounding
Backprobing
Min/Max
Polarity
Scale
Voltage Measurement
Resistance Measurement
Continuity Measurement
Current Measurement1 topic
- Applying Silicone Dielectric Compound to Electrical Connections
Installation of Dielectric Grease
Deutsch HD, DT, DTM, DRC Series
AMP Seal
AMP Mate-N-Lok
DIN Connectors
Exclusions1 topic
- AMP Connector
Applying Silicone Dielectric Compound to AMP Connectors
Wedge Lock
Service - Voltage Reading1 topic
- Deutsch Connectors
DT/DTP Series Assembly
DT/DTP Series Disassembly
HD30/HDP20 Series Assembly
HD30/HDP20 Series Disassembly1 topic
- Telematics Gateway
Telematics-Ready (TCU) Plug1 topic
- Electrical Schematics
Operator Maintenance and Lubrication Diagram
Torque Chart - Sheet 1 of 5 - (SAE Fasteners)
Torque Chart - Sheet 2 of 5 - (SAE Fasteners)
Torque Chart - Sheet 3 of 5 - (SAE Fasteners)
Torque Chart - Sheet 4 of 5 - (METRIC Fasteners)
Torque Chart - Sheet 5 of 5 - (METRIC Fasteners)
Hydraulic Oil Operation Chart
Engine Oil Operation Chart - GM
Engine Oil Operation Chart - Kubota
Drive Motor Special Tools
Drive Motor
Right Front Drive Hydraulic Lines
Left Front Drive Hydraulic Lines
Right Rear Drive Hydraulic Lines
Left Rear Drive Hydraulic Lines
Main Disassembly - Figure 1
Main Disassembly - Figure 2
Main Disassembly - Figure 3
Housing-Spindle
Spindle-Brake Subassembly - Figure 1
Spindle-Brake Subassembly - Figure 2
Spindle-Brake Subassembly - Figure 3
Planet Gear
Spindle-Brake Figure 1
Spindle-Brake Figure 2
Spindle-Brake Figure 3
Housing Ring Gear Subassembly
Drive Hub Assembly
Bearing Pressing Tool
Seal Pressing Tool
Drift Pin for Lining Up Thrustwashers with Output Planet Gear
Bearing Nut Wrench
Axle Oscillation Switches
Oscillating Axle
Swing Motor - Cutaway
Swing Motor Removal and Installation
Swing Motor - Exploded View
Eyebolt for Counterweight
Swing Bearing Feeler Gauge Check
Swing Bearing Tolerance Measuring Point
Bearing Placement
Swing Bearing Torque Sequence
Swing Gear Assembly
Swing Bearing Removal
Cable Installation and Identification - Sheet 1 of 8
Cable Installation and Identification - Sheet 2 of 8
Cable Installation and Identification - Sheet 3 of 8
Cable Installation and Identification - Sheet 4 of 8
Cable Installation and Identification - Sheet 5 of 8
Cable Installation and Identification - Sheet 6 of 8
Cable Installation and Identification - Sheet 7 of 8
Cable Installation and Identification - Sheet 8 of 8
Engine Operating State Diagram
Fuel Level Sensor Schematic
Low Fuel Indicators
Engine Oil Pressure Switch Schematic
Engine Speed Sensor Schematic
Engine Coolant Sensor
Engine Coolant Sensor Schematic
Engine Glow Plug Schematic
Glow Plug Relay
Engine Throttle Actuator Schematic
Proportional Fuel Rack Actuator Schematic
Engine Starter Schematic
Alternator Schematic
Kubota Engine - Sheet 1 of 4
Kubota Engine - Sheet 2 of 4
Kubota Engine - Sheet 3 of 4
Kubota Engine - Sheet 4 of 4
GM Engine - 1 of 6
GM Engine - 2 of 6
GM Engine - 3 of 6
GM Engine - 4 of 6
GM Engine - 5 of 6
GM Engine - 6 of 6
Generator
Counterweight Bolt Torque
Location of Components Platform Support
Platform Support Torque Values
Location of Components - Powertrack
Main Boom Assembly
Jib/ Platform Support
Boom Hydraulic Lines - Sheet 1 of 2
Boom Hydraulic Lines - Sheet 2 of 2
Actuator Theory of Operation
Rotary Actuator - Assembly Drawing
Rotary Actuator - Exploded View
Rotator Counterbalance Valve
Acceptable Oil Leakage on Cylinder Rod
Tower Lift Cylinder
Upper Lift Cylinder
Master Cylinder
Level Cylinder (Prior to SN 0300238046)
Level Cylinder (SN 0300238046 to Present)
Jib Cylinder
Steer Cylinder
Telescope Cylinder
Axle Lockout Cylinder
Hydraulic Tank
Valve Installation - Sheet 1 of 2
Valve Installation - Sheet 2 of 2
Main Pump\Charge Filter Hydraulic Lines
Main Pump\Main Valve Hydraulic Lines
Drive Pump to Main Valve/Tank Hydraulic Lines
Main Control Valve Torque Specifications
Main Control Valve Identification
Flow Divider Valve Torque Specifications
Flow Divider Valve Identification - Sheet 1 of 3
Flow Divider Valve Identification - Sheet 2 of 3
Flow Divider Valve Identification - Sheet 3 of 3
Fly Boom Control Valve Identification
Upright Control Valve Identification
Drive Pump - Cross Sectional View
High Pressure Relief and Charge Check Valve with Bypass Valve in charging mode
High Pressure Relief and Charge Check Valve with Bypass Valve in relief mode
Drive Pump Hydraulic Schematic
EDC-Schematic Diagram
Symbol Chart
Port Locations
Fasteners and Plugs - Sheet 1 of 2
Fasteners and Plugs - Sheet 2 of 2
Charge Pressure Adjustment
Pressure Limiter Adjustment
Neutral Adjustment (EDC) - Bottom View
Control Module Removal/Installation
Shaft assembly
Gear Pump Cutaway
Oil Sampling Port
Hand Held Analyzer
Control Module Location
Ground Module - Sheet 1 of 4
Ground Module - Sheet 2 of 4
Ground Module - Sheet 3 of 4
Ground Module - Sheet 4 of 4
Platform Module - Sheet 1 of 2
Platform Module - Sheet 2 of 2
Analyzer Top Level Menu (Software Version P2.1)
Analyzer Diagnostics Menu - Sheet 1 of 3 (Software Version P2.1)
Analyzer Diagnostics Menu - Sheet 2 of 3 (Software Version P2.1)
Analyzer Diagnostics Menu - Sheet 3 of 3 (Software Version P2.1)
Analyzer Personalities Menu - Sheet 1 of 3 (Software Version P2.1)
Analyzer Personalities Menu - Sheet 2 of 3 (Software Version P2.1)
Analyzer Personalities Menu - Sheet 3 of 3 (Software Version P2.1)
Analyzer Machine Setup Menu (Software Version P2.1)
Analyzer Calibrations Menu (Software Version P2.1)
Voltage Measurement (DC)
Current Measurement (DC)
Application to Male Connector
Use of Seal Plugs
Brad-Harrison M12
Phoenix Contact M12
Connector Assembly Figure 1
AMP Connector
Connector Assembly Figure 2
Connector Assembly Figure 3
Connector Assembly Figure 4
Connector Disassembly
Connector Installation
DT/DTP Contact Installation
DT/DTP Contact Removal
HD/HDP Contact Installation
HD/HDP Locking Contacts Into Position
HD/HDP Contact Removal
HD/HDP Unlocking Contacts
Telematics Gateway Harness - Sheet 1 of 3
Telematics Gateway Harness - Sheet 2 of 3
Telematics Gateway Harness - Sheet 3 of 3
Electrical Schematic - Sheet 1 of 20
Electrical Schematic - Sheet 2 of 20
Electrical Schematic - Sheet 3 of 20
Electrical Schematic - Sheet 4 of 20
Electrical Schematic - Sheet 5 of 20
Electrical Schematic - Sheet 6 of 20
Electrical Schematic - Sheet 7 of 20
Electrical Schematic - Sheet 8 of 20
Electrical Schematic - Sheet 9 of 20
Electrical Schematic - Sheet 10 of 20
Electrical Schematic - Sheet 11 of 20
Electrical Schematic - Sheet 12 of 20
Electrical Schematic - Sheet 13 of 20
Electrical Schematic - Sheet 14 of 20
Electrical Schematic - Sheet 15 of 20
Electrical Schematic - Sheet 16 of 20
Electrical Schematic - Sheet 17 of 20
Electrical Schematic - Sheet 18 of 20
Electrical Schematic - Sheet 19 of 20
Electrical Schematic - Sheet 20 of 20
Hydraulic Schematic - Sheet 1 of 2
Hydraulic Schematic - Sheet 2 of 2
Operating Specifications
Dimensional Data
Capacities
Tires
Mobilfluid 424 Specs
DTE 10 Excel 32 Specs
Quintolubric 888-46
Exxon Univis HVI 26 Specs
Critical Stability Weights
Function Speed
Function Speed Machine Position
Inspection and Maintenance
Cylinder Drift
Inspection and Preventive Maintenance Schedule
Wheel Torque Chart
Drive System Mode Chart
Swing Motor Troubleshooting
Engine Starter Limits
Engine RPM Levels
Glow Plug Conditions
Engine Actuator Conditions
GM Engine Diagnostics Codes
SkyGuard Function Table
Required Tools
Special Tools
Piston Nut Torque
Gland Torque
Main Control Valve Specifications
Flow Divider Specifications
Displacement Limiter Adjustment Data
Port information
Electrical Troubleshooting
System Operating Hot
System Noise Or Vibration
Neutral Difficult or Impossible to Find
Sluggish System Response
Pressure Limiter Settings
Analyzer Abbreviations
Ground Control Switch Inputs
Platform Control Joystick Inputs
Platform Control Switch Inputs
System Startup Checks
Machine Model Adjustment
Machine Configuration Programing Information (Software Version P2.1)
Machine Configuration Programming Settings (Software Version P2.1)
Diagnostic Menu Descriptions
Accessory Weights
SkyGlazier Capacity Reductions
Pipe Rack Capacity Reductions
LSS Troubleshooting Chart
System Fault Code Listing
Fault Code Troubleshooting Information
Overload Variations
Inside this manual
Real pages from this service manual (404 pages). Open the sample pages (PDF, 603 KB)
- Specifications, page 19: SECTION 1 - SPECIFICATIONS
- Troubleshooting, page 325: SECTION 6 - JLG CONTROL SYSTEM
- Diagram, page 379: SECTION 7 - BASIC ELECTRICAL INFORMATION & SCHEMATICS
- Color page, page 150: SECTION 4 - BOOM & PLATFORM
- Color page, page 93: SECTION 3 - CHASSIS & TURNTABLE
Other manuals for this machine
Save 10% on 2 manuals, 15% on 3 or more. Other manuals for the 340AJ are listed below. Editions cover different serial number ranges: check the serial coverage and tick only the ones that match your machine.
This manual: Service Manual 3121259$69.55
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This is a service manual
Here's how it compares to the other manual types.
This manual
Service manual
Factory repair procedures and technical information such as specifications, troubleshooting, and wiring and hydraulic diagrams, for the models and systems the manual covers. See What's inside for its topics.
Operator's manual
Safe operation, controls, maintenance schedules, lubrication points, inspections, and basic checks. Repair procedures are in the service manual.
Parts manual
Illustrated diagrams with factory part numbers for identifying components and ordering parts. Repair procedures are in the service manual.
Engine service manuals are sometimes sold separately, since certain machine models were offered with more than one engine option.
What it's used for
Factory manual for in-house farm and construction shop use. Straightforward, complete, and easy to follow. It contains the OEM information dealership service departments and parts counters use to diagnose problems, identify components, and perform maintenance or repairs correctly.
Service shops and owner/operators who repair their own equipment
Identifying correct parts and seeing how assemblies come apart and go back together
Keeping equipment running with less downtime
Factory manual, 404 pages
Quantity one is the manual described above.
Fast free USA shipping
Ships in 1 business day.
60-day returns
Free if the mistake is ours. A manual ordered in error must come back unopened in its shrink-wrap; you pay return shipping and a 20% restocking fee applies. Return policy
Binder not included
Manuals over about 300 pages may need a standard 3-ring binder, which you can buy locally to keep the pages organized for shop use.
Other editions and similar models
Questions about model, serial number, engine coverage or contents? Contact us before purchasing and we'll help confirm it's the right manual. Please verify the manual type, machine model, serial number range and engine coverage before purchasing: manuals ordered in error carry a 20% restocking fee (return policy).